76 Corvette transmission install - help?
Thread Starter
Cruising
Joined: May 2006
Posts: 11
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From: Lacombe LA
76 Corvette transmission install - help?
I am restoring my 76 vette after Katrina. I replaced a 700r4 tranmission with a th350. Of course it does not fit!! The mounting bracket which attaches to the crossmember does not reach the th350 transmission mounting bolts. I think I need to refit an original mounting plate to the crossmemember. Does anyone have experience with this? Where can I get an original mounting plate? Thanks!!
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
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From: South of giving a damn
St. Jude Donor '11, '17
Might have been easier to stick with another 700-R4. Generally the crossmembers & driveshafts have been changed to get the 700-R4 into a Vette. You may need to visit a Corvette junkyard to get a new crossmember, especially if the crossmember in question has been modded for the 700-R4. You will need a new driveshaft as the 700-R4 is longer than a TH350, therefore your DS is too short, and the end that goes in the tranny may have the wrong spline count. I also believe that the shifter cable may need to be changed.
IMO, you would be better served by going back in with another 700-R4. Maybe the place where you got the TH350 will take it in trade on a 700-R4.
IMO, you would be better served by going back in with another 700-R4. Maybe the place where you got the TH350 will take it in trade on a 700-R4.
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
i replaced my th350 with a 700r4 so i am familar with the process.....why are you putting in a th350??? you would be better off with another 700r4.
heres your issues, with out knowing all the details i will assume the 700r4 was installed correctly using off the shelf hardware
1. you need a different crossmember which may impact your exhaust syatem
2. you need to have your drive shaft lenghtened
3. your shift detent is different and may not work properly
heres your issues, with out knowing all the details i will assume the 700r4 was installed correctly using off the shelf hardware
1. you need a different crossmember which may impact your exhaust syatem
2. you need to have your drive shaft lenghtened
3. your shift detent is different and may not work properly
Last edited by bobs77vet; Jun 27, 2006 at 12:43 PM.
Thread Starter
Cruising
Joined: May 2006
Posts: 11
Likes: 0
From: Lacombe LA
I was trying to go back to stock. Also I couldn't afford a new 700r4. Looks like it will cost me more anyway. The crossmember looks stock - I think the previous owner had a new bracket made to accomodate the R4.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
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From: Chattanooga TN
Look on www.car-part.com you should be able to find a used 700R4 fairly reasonable. Any of them will do since you already have the tail setup for your car. You can look for 700R4 or 4L60, anything 88-93 from a V8 is OK (4 pin or 5 pin, not 4L60E). 2wd Truck/Suburban, F-body, B-body, big Vans. Stay away from 82-87 if possible, although for a bone stock car they are ok if cheap enough. Stay away from V6 versions (Astro van and F-body).
Safety Car
Joined: Oct 2004
Posts: 3,725
Likes: 5
From: Minnesota
Originally Posted by mjdavies
I was trying to go back to stock. Also I couldn't afford a new 700r4. Looks like it will cost me more anyway. The crossmember looks stock - I think the previous owner had a new bracket made to accomodate the R4.
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
Originally Posted by markdtn
Look on www.car-part.com you should be able to find a used 700R4 fairly reasonable. Any of them will do since you already have the tail setup for your car. You can look for 700R4 or 4L60, anything 88-93 from a V8 is OK (4 pin or 5 pin, not 4L60E). 2wd Truck/Suburban, F-body, B-body, big Vans. Stay away from 82-87 if possible, although for a bone stock car they are ok if cheap enough. Stay away from V6 versions (Astro van and F-body).
I did a quick search & found a boatload of trannies & cheap too. Since you'd want to rebuild it it would only need to be in OK condition.
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