700R4 question
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Joined: Jan 2006
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From: Ft. Gordon GA
700R4 question
Well I bought a performance build 700R4 from my buddy that was in his camaro. I thought it would just bolt on my 76 corvette but apparently I was wrong haha. I surfed the old posts and I've gathered that I'll need to shorten the driveshaft. My question is why can't I just use a driveshaft from a thirdgen that came with the stock 700R4? All the posts I've looked up stated people shortening the driveshaft but no one has mentioned just using a stock 700R4 driveshaft. If I'm not mistaken the TH350 driveshaft is 3 inches longer than the 700R4, is there something about the corvette 700R4 that's different from the camaro 700R4s? Thanks for the help in advance, please help a noobie who's in over his head.
Yuchen
Yuchen
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
shortening the drive shaft costs $85 in my neck of the woods......as to your question perhaps the camaros rear end is a different distance from the transmission then the vettes is from its trans so it is a different length.....you also need a a new cross member or to modify yours....go to www.700r4.com for more info
Melting Slicks
Joined: Mar 2006
Posts: 2,465
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From: Orange Park Fl
Go to the web site and contact them. They will send you a list (with cost from them) for everything you will need for the conversion. I hear it is not a simple change over, but that it is worth it. I plan to do mine when the th350 dies (hopefully not too soon). God bless, Sensei
Le Mans Master
Joined: Aug 2003
Posts: 7,720
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From: Chattanooga TN
If the Camaro shaft is the correct length you can use it, but I doubt it is. Not that big a deal to get yours shortened. You can't use an 82 shaft either, the lengths changed with the later aluminum diff. It is a great swap, be sure to adjust the TV cable IMMEDIATELY- do not wait.
Pro
Joined: May 2002
Posts: 518
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F-Body and Vette 700R4's use a different tailhousing and tailshaft.
For you, either use the F-Body 700's main case mount with your TH350's plate, or the S10 700's Tailhousing that puts the mount where a Th400's was, which will require you to drill a couple of new holes in the crossmember.
Either way you'll need to shorten your driveshaft, or use one from a 82 C3, and likely move the Handbrake Pulley off to the side a little to clear the Yoke.
Be careful of the pinion angle either way you go, and always measure in the car before you cut etc...
Doug
For you, either use the F-Body 700's main case mount with your TH350's plate, or the S10 700's Tailhousing that puts the mount where a Th400's was, which will require you to drill a couple of new holes in the crossmember.
Either way you'll need to shorten your driveshaft, or use one from a 82 C3, and likely move the Handbrake Pulley off to the side a little to clear the Yoke.
Be careful of the pinion angle either way you go, and always measure in the car before you cut etc...
Doug
Originally Posted by yuchao4363
Well I bought a performance build 700R4 from my buddy that was in his camaro. I thought it would just bolt on my 76 corvette but apparently I was wrong haha. I surfed the old posts and I've gathered that I'll need to shorten the driveshaft. My question is why can't I just use a driveshaft from a thirdgen that came with the stock 700R4? All the posts I've looked up stated people shortening the driveshaft but no one has mentioned just using a stock 700R4 driveshaft. If I'm not mistaken the TH350 driveshaft is 3 inches longer than the 700R4, is there something about the corvette 700R4 that's different from the camaro 700R4s? Thanks for the help in advance, please help a noobie who's in over his head.
Yuchen
Yuchen
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by doug_dayson
...Either way you'll need to shorten your driveshaft, or use one from a 82 C3...
PS. If you don't use a C2 or C3 yoke, it is very hard to get the shaft into the car. You have to remove the diff to put it in.
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Safety Car
Joined: Oct 2004
Posts: 3,725
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From: Minnesota
Like Bob says, bring your driveshaft to a reputable shop and have them cut it and rebalance it. In checking my notes I had 1 3/4" cut out and it fit perfectly. That's going from a TH400 to a 700R4 out of an 89 pickup.
Last edited by jdmick; Jun 13, 2006 at 11:30 PM.