The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Suspension

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-26-2013, 05:28 PM   #1
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
2.25" Leaf Spring Flip and Upgrade

Well I finally finished the drop on my 71 GMC long bed with 2.25” leaf rear and decided I’d summarize since the information was pretty spread out. Thanks for everyone’s input and suggestions. I’d already done the front 2.5” CPP drop spindles with 1” drop springs when I replaced the front rotors, pads and bearings and was riding with quite a rake for a while. The ride was fine but I couldn't see anybody right behind me.

Name:  2012-12-29_12-13-18_841.jpg
Views: 2311
Size:  58.7 KB

I used the DJM FK1012-5 flip kit and Monroe Sensa-Trac front sized shocks as drop shocks. You need at least two sets of jack stands, a floor jack or two, and I had a jack stand jack that really came in handy. A regular set of socket wrenches is great for working on the Sentra, but you need some big wrenches to work on this suspension. A 15/16” deep socket, a 15/16” ratcheting box end wrench and a 7/8” box end wrench really came in handy for the flip kit. An Irwin step bit was great for drilling out the shock mount bracket and the frame for the bump stops.

I did the flip kit at a buddies shop and his impact wrench was great for breaking loose the old rusty u bolts and spring and shackle bolts. I also used about a can of PB Blaster. After jacking up the truck to rest the frame on jack stands in front of the wheels I jacked up the axle to rest it on jack stands, too. The jack stand jack was great to move around and release tension at various points. The shocks came off easily with regular sized sockets, the impact broke loose the leaf spring bolts, but the u bolts I had to go back and forth with the impact to get them off. They were all rusted and stripped to hell.

I was mostly working by myself and it took me about four hours to get everything off and bolted back together. I left the springs bolted to the shackles and they came out with a sudden thwap against the underside of the bed. The leaf spring center pin came out easily to reverse (which I don’t believe was mentioned in the directions but was mentioned in another user’s post). I didn't have a stand under the drive shaft and the pinion angle was pretty extreme after bolting everything up. Ends up I had two short bolts and two longer bolts on each side of the axle locator bracket and upper axle plate, after reading the directions the 3.5” bolts go in the front and 4” go in the back. After wrestling with tightening and loosening bolts to try to get the pinion straight I gave up, put the new shocks and tires back on and lowered the truck. I was eating pavement it was so low, no travel and axle slamming into the frame all the way home because I hadn't re-installed the bump stops.

Name:  IMAG0501.jpg
Views: 2090
Size:  51.0 KB

After consulting the experts (you guys), I pinpointed a few possible problems: 1) Were drop shackles previously installed? No, new shackles were ordered and they were the same as the ones already on there, but I kept them because they had new bushings already pressed in and I bought new grade 8 bolts, too. 2) Were some spring leafs already removed? Maybe, my friend’s ‘71 is practically identical to mine and both of us have 3leaf/1helper setups, but factory replacements come 5/1. 3) Shocks need to be relocated to a more upright position. 4) Bump stops need to be trimmed/reinstalled and I hadn’t drilled the frame and installed the button stops that come with the flip kit.

The first thing I did was relocate the shocks. After a bit of digging a fellow member mentioned drilling out the hole directly behind the stock mounting stud and bolting on a new one. I used the step bit to drill out the holes and a stock Monroe mounting stud that came with the new shocks. I had to buy a replacement 5/16” nut because the ones that came with the stud didn’t thread all the way down and lock washers (which I didn’t initially use and lost one of the nuts). Bolted up the shocks and voila, I had some suspension travel. I reinstalled the factory bump stops but I was basically riding on them. I could drive this way but it was bouncy and pretty jarring when hitting the bump stops, which happened a lot. I trimmed the bump stops 1” with my band saw and the ride was (almost) tolerable, but I was still a bit too low in the back for my comfort and front ride height. A c-notch in the back and 2” drop springs in the front would have probably set me straight but I went in another direction.

Name:  IMAG0817.jpg
Views: 2001
Size:  26.0 KB

I knew I wanted to raise the back an inch or two, and wasn’t looking forward to drilling/cutting the frame for a notch, and I needed to drop the springs to drill the frame for the button bump stops anyway. I also already had new stock shackles with bushings and replacement bushings for my 3/1 leaf pack were like 4 X $14.00 each and would require some work to get them out/in, so I decided to replace my springs with a new 5/1 pack with bushings already pressed in. I spent an evening dropping out the old springs and another drilling the frame to put in the button bump stops and new springs. Boy, I’m glad I did. It’s like riding on silk, firm and smooth with no bottoming out. It only raised the rear about 1” so I might still put the 2” drop springs in the front, but there is no rush on that. I have about 3” of shock travel and went over speed big bumps and the back handles them better than the front now.

Name:  IMAG0828.jpg
Views: 1859
Size:  54.5 KB

So quick summary: DJM flip kit ($130 Summit), Monroe Sensa-Trac front size ($60 Summit but with a rebate to come), shock relocate ($4 in nuts/washers), button bump stops , new shackles and springs with bushings and bolts ($60 SD Truck Springs), 5/1 leaf spring pack with bushings ($350 shipped in 2 days from General Springs KC, made in the USA, baby) = about a 6” drop and a whole new rear suspension for about $600 plus some additional tools in the garage ($30 step bit and $50 in additional sockets and box end wrenches from Ace Hardware).

Name:  IMAG0837.jpg
Views: 1783
Size:  63.8 KB

If you have the 3/1 pack you could save some money by c-notching with quite a bit more sweat over replacing with a 5/1 pack but I stick with my decision of the new pack. I know there are also drop leaf springs available but I already did the flip kit and couldn’t return it used, and I have no idea how the ride is on drop leafs. My set up can also still be reversed if necessary.
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 04-26-2013, 05:42 PM   #2
lolife99
Registered User
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,004
Re: 2.25" Leaf Spring Flip and Upgrade

Great write up for the leaf spring truck guys.
Thanks!
__________________
Keith
lolife99 is offline   Reply With Quote
Old 04-26-2013, 09:37 PM   #3
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

Many of your threads and comments helped lolife. This forum is PRICELESS
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 04-26-2013, 11:30 PM   #4
oldman3
Senior Member
 
oldman3's Avatar
 
Join Date: Mar 2011
Location: West Plains, Missouri
Posts: 5,872
Re: 2.25" Leaf Spring Flip and Upgrade

Thanks much for posting your work and the outcome. Will be starting a 68 GMC with leafs soon and this is a big help. Thanks again...Jim
oldman3 is offline   Reply With Quote
Old 04-27-2013, 09:33 AM   #5
duallyjams
PICS IM MY PROFILE
 
duallyjams's Avatar
 
Join Date: May 2007
Location: Deale Md
Posts: 4,500
Re: 2.25" Leaf Spring Flip and Upgrade

Quote:
Originally Posted by lolife99 View Post
Great write up for the leaf spring truck guys.
Thanks!
x2
__________________
James

2002 GMC cc dwr sporting alcoa D-max 22MPG
63 GMC V6 4speed carryall
64 GMC lwb 3/4 V6 4speed seeking factory optionSOLD
65 chevy swb bbw V8 auto
66 GMC swb bbw buddy bucketsSOLD

IG duallyjams

The only thing that stays the same is constant change!
duallyjams is offline   Reply With Quote
Old 05-17-2013, 12:28 PM   #6
tommyd241
Registered User
 
tommyd241's Avatar
 
Join Date: May 2008
Location: 505
Posts: 446
Re: 2.25" Leaf Spring Flip and Upgrade

Great write up! Thanks for sharing!
__________________
'68 SWB Fleetside
'98 K1500 Silverado
tommyd241 is offline   Reply With Quote
Old 05-20-2013, 10:31 AM   #7
hpcgmc
Registered User
 
hpcgmc's Avatar
 
Join Date: Oct 2012
Location: Northern Cal
Posts: 246
Re: 2.25" Leaf Spring Flip and Upgrade

Great writeup, Thanks! I'm just about to do the same thing, and am weighing flip kit vs. drop leafs.
__________________
1967 GMC 1500 SWB. Driving this truck since I was 14.
hpcgmc is offline   Reply With Quote
Old 05-20-2013, 11:15 AM   #8
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

If you do the drop leaf I would still replace the shackles so you get the new bushings. I hear bushings are about $15 and the shackles with bushings were only $25
Posted via Mobile Device
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 05-25-2013, 06:34 PM   #9
INSIDIOUS '86
Registered User
 
INSIDIOUS '86's Avatar
 
Join Date: Jul 2009
Location: everett washington
Posts: 4,173
Re: 2.25" Leaf Spring Flip and Upgrade

Be nice to your djm flip kit
Posted via Mobile Device
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac
3''spintech prostreet mufflers xpipe 1 3/4 headers
build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217
Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511
INSIDIOUS '86 is offline   Reply With Quote
Old 05-25-2013, 06:46 PM   #10
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

The brackets for the 2.25" flip kits are a lot more substantial than that.

Name:  IMAG0507.jpg
Views: 3244
Size:  33.2 KB
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 07-23-2015, 05:30 PM   #11
WarMonger
Registered User
 
WarMonger's Avatar
 
Join Date: Jan 2015
Location: Ventura, CA
Posts: 744
Re: 2.25" Leaf Spring Flip and Upgrade

Bump this up to the top. Great write up on a flip kit. Do you remember the part number for the shocks you used?
__________________
..................... ____
.........________//__{\_____
,,,,,,,/__(O)___//___/__(O)_/
1970 C20
-_--_--_- ______
_--_--_- /___|__\____
-_--_-_ |_(0)|__|_(0)]
1972 K5
WarMonger is offline   Reply With Quote
Old 07-23-2015, 05:48 PM   #12
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

Should be Monroe 37049ST http://www.summitracing.com/parts/mo...5-c1500-pickup

They are a little soft, but have held up nicely while being driven "spiritedly", and are real affordable, especially with all the rebate Monroe does.
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 08-24-2017, 11:41 PM   #13
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

Wow! This forum is great. Thanks for your time spent in making this thread. I have a 71 gmc long bed with same 3/1 set up as you and have been searching for days for this info, just got my truck few months back and it is busting knuckle time. I have been under the truck several times with a tape guessing what would happen if I flipped my 3/1 leafs. Just looked as if it would be to close to the frame as opposed to other flips I have seen, I even contacted previous owner to ask if rear was stock because it wasnt adding up properly. After doing what you did, would lowering springs be cheaper, with same effect. I am running 18s tt2s and having the very same issue you had. I'm doing a full upgrade on the front as well all new. Any additional input would be very helpful to me. I will mass order what I need this weekend. Hopefully it will turn out as nice as yours. Some pics below of what I'm working with at the moment.
Attached Images
     

Last edited by PaPaStewySnipes; 08-24-2017 at 11:56 PM.
PaPaStewySnipes is offline   Reply With Quote
Old 09-14-2017, 07:24 PM   #14
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

Sorry for the late reply. If you haul anything I would go with replacement leaf packs like I did and a flip. I still haven't notched and occasionally haul loads with no problems and little bottoming out. If you are just cruising I would go with lowered leafs for ease of install and all new stuff vs. flipping old questionable leafs.
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 09-14-2017, 07:47 PM   #15
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

I have some on the way, ece 4" drop leafs coming in tomorrow. They should have been droped off today but fedex is b.s.

That will give me 4" drop. I was thinking about going with Djm shackles. Those drop 1.75"-2". They have 2 holes to adjust that 1/4".
PaPaStewySnipes is offline   Reply With Quote
Old 09-14-2017, 07:53 PM   #16
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

Already have my front 3" Belltech drop spindles and 1" drop springs just getting front ready now, adding a new wilwood mast and prop as well. Hand bending some new lines also. Some pics below, I did that all yesterday.
Attached Images
    
PaPaStewySnipes is offline   Reply With Quote
Old 09-14-2017, 08:06 PM   #17
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

Good work brother, and good choices! I wish I had cleaned up my parts a bit better like you did. New shackles stock or drop will give you new bushings, but you can install with the old to see if you like a rake or not before ordering.
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 09-14-2017, 08:08 PM   #18
sKnNyPpY
Registered User
 
sKnNyPpY's Avatar
 
Join Date: Sep 2012
Location: Columbia, SC
Posts: 527
Re: 2.25" Leaf Spring Flip and Upgrade

I live in West Cola, but drive the truck in to Rosewood quite a bit. I work at The Cigar Box Rosewood Drive.
__________________
Life is too long to go slow...
71 GMC 1500 Super Custom LWB
350/350 AC(replaced w/vintage air)/PS/PB
2.5 Spindle 1" CPP Spring, CPP Front Sway Bar/DJM Flip, new 5 spring pack, HEI /IntReg Alt
20x8.5 OldSkools, 275/45 Falkens
sKnNyPpY is offline   Reply With Quote
Old 09-14-2017, 08:11 PM   #19
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

Eactly, I havent ordered shackles yet but I can get them in 3 days, better to see what the look will be. I have a wilwood rear disk kit, and new willwood d52s for front. Will look nice so I couldnt live with putting that hardware on some dirty and rusted control arms. I used purple power for clean up, wire wheel on drill, srayed some vinegar, water, krud kutter the must for rust mix for rust conversion. Laid 2 coats of rustoleum reformer, top coat with but chassis black. Used heater while doing to keep parts warm to hot, came out really nice.
PaPaStewySnipes is offline   Reply With Quote
Old 09-14-2017, 08:12 PM   #20
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

I didnt realize your in Columbia sc, lol. I'm in irmo by mall.
PaPaStewySnipes is offline   Reply With Quote
Old 09-15-2017, 06:54 AM   #21
drfloyd
Senior Member
 
Join Date: Sep 2015
Location: Scranton, SC
Posts: 248
Re: 2.25" Leaf Spring Flip and Upgrade

Good to see a couple of SC guys not too far away.
drfloyd is offline   Reply With Quote
Old 09-15-2017, 12:14 PM   #22
PaPaStewySnipes
Registered User
 
Join Date: May 2017
Location: Columbia, South Carolina
Posts: 103
Re: 2.25" Leaf Spring Flip and Upgrade

Just got the bad boys in, next to them is my refinished control arms for drivers side. Getting back to work on the front suspension and brakes today.
Attached Images
 
PaPaStewySnipes is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com