700r4 driveshaft length question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

geekitupsum · 09-13-2015, 08:54 PM

so i have a 69 long bed that has a 350 sitting in the inline 6 perches and a th350 behind it.

I want to put in a 700r4 and was wondering if i move the motor to the v8 perches upfront then put the 700r4 in, would i still have to have the driveshaft cut?

*Fitz* · 09-13-2015, 09:05 PM

Quote:

Originally Posted by geekitupsum

so i have a 69 long bed that has a 350 sitting in the inline 6 perches and a th350 behind it.

I want to put in a 700r4 and was wondering if i move the motor to the v8 perches upfront then put the 700r4 in, would i still have to have the driveshaft cut?

There's one sure way to find out. Put a 700R4 in your truck and get out your tape measure.......

geekitupsum · 09-13-2015, 09:07 PM

Quote:

Originally Posted by Fitz

There's one sure way to find out. Put a 700R4 in your truck and get out your tape measure.......

thanks but I'm just trying to plan for the swap.....

hugger6933 · 09-13-2015, 09:22 PM

Your gonna need to plan on driveshaft mods

70's luvr · 09-14-2015, 10:10 AM

Needs to be cut.

bill3rail · 09-14-2015, 10:16 AM

Rarely do you luck out with an engine swap.

As much planning as you can do, will not see all roadblocks of a swap unless you've done one before or have someone that has done them prior.
Have plenty of cash on hand or plenty of time to complete it.

Bill

mike16 · 09-14-2015, 10:26 AM

the yoke should engage the splines of the transmission tail shaft for a minimum distance or depth of three inches.

Big Kev-O · 09-14-2015, 11:04 AM

I have a 68 GMC C20 longbed, 350 engine, 700r4 trans. The previous owner removed the inline six and installed the 350/700r4 combo. If I remember correct the origional V6 mounts were riveted to the frame. My current mounts are bolted in so I assume they were moved. I don't think my driveshaft has been cut. I can measure my driveshafts and post pics of my motor mounts if you would like.

70's luvr · 09-14-2015, 12:16 PM

Driveshaft shop only charged 45$ to cut down my 700R4 drive shaft. I kept the turbo 400 original DS in case I ever wanted to go back. just had to move carrier bearing cross member. NAPA had a conversion ujoint to mate up to my Dana 60.

leftybass209 · 09-14-2015, 02:17 PM

I've already been through this multiple times with my truck, and friends' trucks. The way you know for sure, is to measure with everything in place, suspension sitting where you want it (raised, lowered, bagged, whatever), on level ground. You can attempt to calculate the exact measurement you need, but a good driveshaft shop can take your measurement from yoke to yoke and calculate the distance needed for the slip yoke.

Z10 · 09-14-2015, 07:32 PM

Yes. About 3 inches. I just did this swap, sounds exactly like what you are doing. See my build thread for more.

9teen69 · 09-14-2015, 08:21 PM

Quote:

Originally Posted by Z10

Yes. About 3 inches. I just did this swap, sounds exactly like what you are doing. See my build thread for more.

X2, on my 69 longbed with V8

brad_man_72 · 09-14-2015, 09:03 PM

Put the engine in as far back as possible, have the shaft cut and balanced, and never look back.
I've had 3 different length driveshafts in my truck only one driveline swap and no wheelbase changes.

09-13-2015, 08:54 PM	#1
geekitupsum Registered User Join Date: Mar 2013 Location: spring hill tn Posts: 54	700r4 driveshaft length question so i have a 69 long bed that has a 350 sitting in the inline 6 perches and a th350 behind it. I want to put in a 700r4 and was wondering if i move the motor to the v8 perches upfront then put the 700r4 in, would i still have to have the driveshaft cut?

09-13-2015, 09:22 PM	#4
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,257	Re: 700r4 driveshaft length question Your gonna need to plan on driveshaft mods

09-14-2015, 10:10 AM	#5
70's luvr Registered User Join Date: Nov 2013 Location: Spring Hill,Fl Posts: 223	Re: 700r4 driveshaft length question Needs to be cut.

09-14-2015, 10:16 AM	#6
bill3rail Registered User Join Date: Jul 2013 Location: LI, NY 11801 Posts: 1,140	Re: 700r4 driveshaft length question Rarely do you luck out with an engine swap. As much planning as you can do, will not see all roadblocks of a swap unless you've done one before or have someone that has done them prior. Have plenty of cash on hand or plenty of time to complete it. Bill

09-14-2015, 10:26 AM	#7
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,529	Re: 700r4 driveshaft length question the yoke should engage the splines of the transmission tail shaft for a minimum distance or depth of three inches.

09-14-2015, 11:04 AM	#8
Big Kev-O Registered User Join Date: Mar 2014 Location: Simi, CA Posts: 495	Re: 700r4 driveshaft length question I have a 68 GMC C20 longbed, 350 engine, 700r4 trans. The previous owner removed the inline six and installed the 350/700r4 combo. If I remember correct the origional V6 mounts were riveted to the frame. My current mounts are bolted in so I assume they were moved. I don't think my driveshaft has been cut. I can measure my driveshafts and post pics of my motor mounts if you would like. __________________ Made in America by Americans

09-14-2015, 12:16 PM	#9
70's luvr Registered User Join Date: Nov 2013 Location: Spring Hill,Fl Posts: 223	Re: 700r4 driveshaft length question Driveshaft shop only charged 45$ to cut down my 700R4 drive shaft. I kept the turbo 400 original DS in case I ever wanted to go back. just had to move carrier bearing cross member. NAPA had a conversion ujoint to mate up to my Dana 60.

09-14-2015, 02:17 PM	#10
leftybass209 Registered User Join Date: Feb 2011 Location: Modesto, CA Posts: 2,186	Re: 700r4 driveshaft length question I've already been through this multiple times with my truck, and friends' trucks. The way you know for sure, is to measure with everything in place, suspension sitting where you want it (raised, lowered, bagged, whatever), on level ground. You can attempt to calculate the exact measurement you need, but a good driveshaft shop can take your measurement from yoke to yoke and calculate the distance needed for the slip yoke.

09-14-2015, 07:32 PM	#11
Z10 Registered User Join Date: Aug 2012 Location: Midland, TX Posts: 1,267	Re: 700r4 driveshaft length question Yes. About 3 inches. I just did this swap, sounds exactly like what you are doing. See my build thread for more. __________________ 1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i

09-14-2015, 09:03 PM	#13
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: 700r4 driveshaft length question Put the engine in as far back as possible, have the shaft cut and balanced, and never look back. I've had 3 different length driveshafts in my truck only one driveline swap and no wheelbase changes. __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,



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