Project: Greenbach Twin Turbo 68 C20 Build - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CrownFab · 12-21-2015, 01:49 AM

This is going to be my first truck build and I am super excited. My father in law and I bought this truck about 7 or 8 years ago. We were looking for a shop truck to build but found this gem on ebay and fell in love. It was already bagged when we got it but the work was "subpar" to put it nicely. This truck came out of Michigan and was neglected. It has rust all over, it is much worse than I thought now that I have tore into it...... I am so in love with this truck so I have a lot of patching to do.

2 years ago it lost a transmission and with work being crazy busy and life not cooperating I had to park it. I finally got to a point where I could give it the love it desperately needs.

So as of right now the build is going to be a twin turbo LS with a T56 tranny. I plan on keeping the exterior as is because I really like the patina on the original color. The interior is going to be all updated. I plan on running a digital dash from Haltech which will give me all the information I need so I wont be needing to run any gauges.

Here is a picture of the "greenbach" from a few years ago with a Triumph I built in the bed.

Also have a T56 transmission from a late 90s WS6 trans-am.

Here is how the previous owners cut the dash to make room for some gauges.

And the last picture is how she sits tonight. I removed the whole front end and I am taking the core support in for sandblasting tomorrow.

TexasLS1 · 12-21-2015, 02:59 PM

Great plans for the truck! Can't wait to see the progress.

CrownFab · 01-24-2016, 08:25 PM

Some update pictures.

I ran out of space in the garage at my house so I finally had to pull the trigger and take it down to my shop...

Got the bed off and all the old plumbing out from the air bag system... Going to build a new back half and run all the air lines in hard line.

I got the T56 mated up to the new LS. Once the old motor is removed this will be ready to go in.

mooseknuckles · 01-24-2016, 09:22 PM

cool build!

bs46488 · 01-25-2016, 04:29 PM

Very nice. I like the LS and T56 setup.

I keep running into that same problem of "running out of room", but I don't have a shop to bring my project to.

CrownFab · 01-28-2016, 11:09 AM

Oh boy. This is turning into a fun project. At least now I think she is done with her surprises. I finally got the cab off so I can see what I am working with. The "C" notch in the rear frame section is horrid.

I am building a new back half so I have a new canvas to start with.

Something is up with the shock location. The rear links I made are the exact same length and the exact same hole centers. Yet the truck has almost an 1" difference left to right. I am not going to spend much time trying to figure it out since it is all going away anyways.

**Hart_Rod** · 01-28-2016, 01:59 PM

Sweet build!

Check out some ChubTubz for your rear wheel tubs!

http://67-72chevytrucks.com/vboard/s...d.php?t=675754

Wasted Income · 01-28-2016, 02:31 PM

In for the twins.

Are you gonna do anything to the LS, or leave it stock? I've got a whole collection of broken pistons and bent rods from my years of beating on stock LS turbo stuff. lol.

CrownFab · 01-29-2016, 10:30 PM

Got some work done today on the truck. Made one side of the rear frame section. Welded one pass all around with make the second and final pass tomorrow along with building the other side. Hopefully I have some help tomorrow going to try and get the old motor out...

CrownFab · 01-29-2016, 10:31 PM

Quote:

Originally Posted by Wasted Income

In for the twins.

Are you gonna do anything to the LS, or leave it stock? I've got a whole collection of broken pistons and bent rods from my years of beating on stock LS turbo stuff. lol.

As of right now I am just running all stock. The plan is to get it running and get all the bugs worked out then build another motor and swap it.

I didn't want to spend any cash on the motor internals right now because I new this truck was going to need a lot of work. Plus I want to drive it...

swamp rat · 01-30-2016, 12:28 AM

I gotta compliment you on that fab work bench, real nice, what thickness is that top? 3/16?

CrownFab · 01-30-2016, 07:48 PM

Quote:

Originally Posted by swamp rat

I gotta compliment you on that fab work bench, real nice, what thickness is that top? 3/16?

The top is 1/4". I really like how it cam out. Its the nicest bench I have ever had.

CrownFab · 01-30-2016, 07:54 PM

Made some progress today.

Removed the old motor and got the new motor installed. Have to make a rear tranny mount and then get the bed back on for modification. I removed the harness so I can start on that nightmare next week.

Going to finish up the rear frame rails tomorrow. Hopefully I can keep it rolling now. August is coming pretty quick.

CrownFab · 02-07-2016, 03:22 PM

Got the transmission crossmember fabbed up and installed. Don't mind the long bolts thats all I had laying around the shop today. Also got the rear frame rails welded and ready for install..

Waiting on the bag brackets to get here so I can start the rear suspension.

cheyennesr · 02-11-2016, 11:07 AM

looking good, kinda makes me want work on mine .nice welds all your work looks awsome.i cant wait to see this come together.

Heavymetl · 02-11-2016, 11:15 AM

Depending on the exhaust, you may need to modify the crossmember. I had to make one too for clearance of the 4" downpipe on my build.

Looks great though!

reaper71 · 02-11-2016, 11:21 AM

Really cool build so far I'm in...

Mark...

WarMonger · 02-11-2016, 11:45 AM

Your fab work is great. Really nice job. I cant wait to see the build progress.

CrownFab · 02-11-2016, 01:18 PM

Quote:

Originally Posted by Heavymetl

Depending on the exhaust, you may need to modify the crossmember. I had to make one too for clearance of the 4" downpipe on my build.

Looks great though!

I was thinking the same thing. But I am hoping to run the exhaust outboard of the frame rails and exit through the bed just behind the doors.

Wasted Income · 02-11-2016, 02:57 PM

I ran my 4" dp outboard of the frame rail and dumped it just before the rear tire. The blazer rocker boxes make it tricky..not much room down there.

**Dieselwrencher** · 02-11-2016, 03:10 PM

Nice truck and cool project! That will be a fun ride for sure!

CrownFab · 02-11-2016, 07:06 PM

Going to have a busy weekend. Got all the rear bag pieces minus a few tabs which I will pick up tomorrow.

Plan is to have the new rear frame section in this weekend. I have a new 4wd rear axle coming tomorrow. So I can start the 6 lug conversion.

Also picked up some 22" transit wheels which look really good with the hub caps that came off the truck...

Once I get tires on the new wheels I can make the trailing arms and get the rear bag system all ready to go.. Then on to the motor..

CrownFab · 02-16-2016, 01:10 AM

Got the rear frame section cut off today. Got the new frame rails level squared and tacked.

Going to finish welding it out this week and start on the 4 link.

I hope to have it on its wheels by the weekend.

CrownFab · 02-22-2016, 12:59 PM

Got the rear frame section welded in. Put the cab on so I could cut the trans tunnel. Going to send the frame out to sandblasting and wanted to fit the cab before the frame left so I can work on the cab while the frame is gone.

I am on the fence about a dropmember or not...... Now is the time to make the decision.

12-21-2015, 01:49 AM	#1
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Project: Greenbach Twin Turbo 68 C20 Build This is going to be my first truck build and I am super excited. My father in law and I bought this truck about 7 or 8 years ago. We were looking for a shop truck to build but found this gem on ebay and fell in love. It was already bagged when we got it but the work was "subpar" to put it nicely. This truck came out of Michigan and was neglected. It has rust all over, it is much worse than I thought now that I have tore into it...... I am so in love with this truck so I have a lot of patching to do. 2 years ago it lost a transmission and with work being crazy busy and life not cooperating I had to park it. I finally got to a point where I could give it the love it desperately needs. So as of right now the build is going to be a twin turbo LS with a T56 tranny. I plan on keeping the exterior as is because I really like the patina on the original color. The interior is going to be all updated. I plan on running a digital dash from Haltech which will give me all the information I need so I wont be needing to run any gauges. Here is a picture of the "greenbach" from a few years ago with a Triumph I built in the bed. Also have a T56 transmission from a late 90s WS6 trans-am. Here is how the previous owners cut the dash to make room for some gauges. And the last picture is how she sits tonight. I removed the whole front end and I am taking the core support in for sandblasting tomorrow.

12-21-2015, 02:59 PM	#2
TexasLS1 Registered User Join Date: Jul 2012 Location: Jonestown, TX Posts: 469	Re: Project: Greenbach Twin Turbo 68 C20 Build Great plans for the truck! Can't wait to see the progress.

01-24-2016, 08:25 PM	#3
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Some update pictures. I ran out of space in the garage at my house so I finally had to pull the trigger and take it down to my shop... Got the bed off and all the old plumbing out from the air bag system... Going to build a new back half and run all the air lines in hard line. I got the T56 mated up to the new LS. Once the old motor is removed this will be ready to go in.

01-24-2016, 09:22 PM	#4
mooseknuckles Registered User Join Date: Sep 2009 Location: ottawa,canada Posts: 4,550	Re: Project: Greenbach Twin Turbo 68 C20 Build cool build! __________________ my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682

01-25-2016, 04:29 PM	#5
bs46488 Registered User Join Date: May 2014 Location: San Diego, CA Posts: 547	Re: Project: Greenbach Twin Turbo 68 C20 Build Very nice. I like the LS and T56 setup. I keep running into that same problem of "running out of room", but I don't have a shop to bring my project to.

01-28-2016, 11:09 AM	#6
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Oh boy. This is turning into a fun project. At least now I think she is done with her surprises. I finally got the cab off so I can see what I am working with. The "C" notch in the rear frame section is horrid. I am building a new back half so I have a new canvas to start with. Something is up with the shock location. The rear links I made are the exact same length and the exact same hole centers. Yet the truck has almost an 1" difference left to right. I am not going to spend much time trying to figure it out since it is all going away anyways.

01-28-2016, 01:59 PM	#7
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,835	Re: Project: Greenbach Twin Turbo 68 C20 Build Sweet build! Check out some ChubTubz for your rear wheel tubs! http://67-72chevytrucks.com/vboard/s...d.php?t=675754 __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

01-28-2016, 02:31 PM	#8
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: Project: Greenbach Twin Turbo 68 C20 Build In for the twins. Are you gonna do anything to the LS, or leave it stock? I've got a whole collection of broken pistons and bent rods from my years of beating on stock LS turbo stuff. lol. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2016 Ford Explorer Sport - Twin Turbskis 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

01-29-2016, 10:30 PM	#9
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Got some work done today on the truck. Made one side of the rear frame section. Welded one pass all around with make the second and final pass tomorrow along with building the other side. Hopefully I have some help tomorrow going to try and get the old motor out... Attached Images

01-30-2016, 12:28 AM	#11
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Project: Greenbach Twin Turbo 68 C20 Build I gotta compliment you on that fab work bench, real nice, what thickness is that top? 3/16? __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

01-30-2016, 07:54 PM	#13
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Made some progress today. Removed the old motor and got the new motor installed. Have to make a rear tranny mount and then get the bed back on for modification. I removed the harness so I can start on that nightmare next week. Going to finish up the rear frame rails tomorrow. Hopefully I can keep it rolling now. August is coming pretty quick. Attached Images

02-07-2016, 03:22 PM	#14
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Got the transmission crossmember fabbed up and installed. Don't mind the long bolts thats all I had laying around the shop today. Also got the rear frame rails welded and ready for install.. Waiting on the bag brackets to get here so I can start the rear suspension. Attached Images

02-11-2016, 11:07 AM	#15
cheyennesr Registered User Join Date: Jun 2014 Location: redbanks ms Posts: 18	Re: Project: Greenbach Twin Turbo 68 C20 Build looking good, kinda makes me want work on mine .nice welds all your work looks awsome.i cant wait to see this come together.

02-11-2016, 11:15 AM	#16
Heavymetl Registered User Join Date: Feb 2012 Location: Southern Ohio Posts: 292	Re: Project: Greenbach Twin Turbo 68 C20 Build Depending on the exhaust, you may need to modify the crossmember. I had to make one too for clearance of the 4" downpipe on my build. Looks great though! __________________ 1970 C10 Turbo LM7 5.3/LS6 cam PT7675/4L80E/Holley Dominator EFI/E85 Moser 9" 3.25/4 wheel discs 11.16@121.07

02-11-2016, 11:21 AM	#17
reaper71 Registered User Join Date: Nov 2011 Location: West Plains Missouri Posts: 2,088	Re: Project: Greenbach Twin Turbo 68 C20 Build Really cool build so far I'm in... Mark... __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=645774 Project Orangepeel 52 A.D. http://67-72chevytrucks.com/vboard/s...d.php?t=653337 John's LS 49 dodge http://67-72chevytrucks.com/vboard/s...d.php?t=655780 Blake's 67 GMC LS stepside http://67-72chevytrucks.com/vboard/s...d.php?t=690527 Reed 78 FJ40 Rebuild http://67-72chevytrucks.com/vboard/s...d.php?t=733259 Barger's 78 FJ40



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02-11-2016, 11:45 AM	#18
WarMonger Registered User Join Date: Jan 2015 Location: Ventura, CA Posts: 818	Re: Project: Greenbach Twin Turbo 68 C20 Build Your fab work is great. Really nice job. I cant wait to see the build progress. __________________ ..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___\|__\____ -_--_-_ \|_(0)\|__\|_(0)] 1972 K5

02-11-2016, 02:57 PM	#20
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: Project: Greenbach Twin Turbo 68 C20 Build I ran my 4" dp outboard of the frame rail and dumped it just before the rear tire. The blazer rocker boxes make it tricky..not much room down there. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2016 Ford Explorer Sport - Twin Turbskis 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-11-2016, 03:10 PM	#21
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,141	Re: Project: Greenbach Twin Turbo 68 C20 Build Nice truck and cool project! That will be a fun ride for sure! __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

02-11-2016, 07:06 PM	#22
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Going to have a busy weekend. Got all the rear bag pieces minus a few tabs which I will pick up tomorrow. Plan is to have the new rear frame section in this weekend. I have a new 4wd rear axle coming tomorrow. So I can start the 6 lug conversion. Also picked up some 22" transit wheels which look really good with the hub caps that came off the truck... Once I get tires on the new wheels I can make the trailing arms and get the rear bag system all ready to go.. Then on to the motor.. Attached Images

02-16-2016, 01:10 AM	#23
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Got the rear frame section cut off today. Got the new frame rails level squared and tacked. Going to finish welding it out this week and start on the 4 link. I hope to have it on its wheels by the weekend. Attached Images

02-22-2016, 12:59 PM	#24
CrownFab Registered User Join Date: Oct 2015 Location: Las Vegas Nevada Posts: 13	Re: Project: Greenbach Twin Turbo 68 C20 Build Got the rear frame section welded in. Put the cab on so I could cut the trans tunnel. Going to send the frame out to sandblasting and wanted to fit the cab before the frame left so I can work on the cab while the frame is gone. I am on the fence about a dropmember or not...... Now is the time to make the decision. Attached Images

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