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200R4 swap for Pont.TH400 or 350
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Posted: 04/24/09
12:16 AM
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hey Im new here and trying to get info on a project that is in the works....79 T/A...6.6 400 Pontiac engine,Im not sure if it is a TH350 or TH400, never the less I want overdrive, for cruising the 3 speed just dont cut it...what is involved in this pontiac swap?? is there links to where I may find this swap?? are there suppliers that make adapter kits??....any help is appreciated ...thanks....jeff
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CSIROC
Guru
| Posts: 793
| Joined: 11/05
Posted: 04/24/09
08:58 AM
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No adapter kits should be necessary as the 200-4R has a BOP and Chevy bolt pattern. When I swapped in the 200-4R for my old TH400 in my Cutlass...the ONLY thing I had to do was change out the yoke on the driveshaft and bend new transmission cooler lines...it bolted right in otherwise.
68 Olds Cutlass ~ 350 Rocket
85 Delta 88 ~ 425 Rocket
02 Silverado 4X4 ~ 5.3L
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Posted: 05/01/09
05:40 AM
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What was different for the yoke? I have a 87 caprice wagon with a 200-4r and I took out a drive shaft from a 78' Pontiac safari wagon with a 375 or 350 and it seemed to fit fine until i started to get this god awful clunk under very hard acceleration. I was wondering if it could be the tranny yoke pulling outa the tranny. Did you get a longer yoke?
`
It may not be the fastest or prettiest, but i can pretend
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CSIROC
Guru
| Posts: 793
| Joined: 11/05
Posted: 05/01/09
06:01 AM
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 squarebackjalopy:
What was different for the yoke? I have a 87 caprice wagon with a 200-4r and I took out a drive shaft from a 78' Pontiac safari wagon with a 375 or 350 and it seemed to fit fine until i started to get this god awful clunk under very hard acceleration. I was wondering if it could be the tranny yoke pulling outa the tranny. Did you get a longer yoke?
I had a 400 before switching to the 200-4R. There's a HUGE difference in size of the yokes.
For your issue...it could be as simple as a bad u-joint.
68 Olds Cutlass ~ 350 Rocket
85 Delta 88 ~ 425 Rocket
02 Silverado 4X4 ~ 5.3L
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Posted: 05/01/09
12:44 PM
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I put a 700r4 in my '69 Firebird 400. I used a 700r4 yoke from the junkyard and an adapter plate to bolt it to the block. Make sure your drive shaft is the correct length and not bottoming out in the transmission. Lastly check what differential gear ratio you have. I had 2.73's and it was on the fringe of the overdrive not being usable (80mph at 1800rpm, needs LOTS of low end torque for that) and lots of F-bodies that year had 2.42 gears.
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The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. Needing to replace a '69 Firebird 400.
http://www.bangshift.com/forum/index.php?topic=6189.0
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Posted: 05/21/09
08:27 AM
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Hey Jeff, a company called Monster Transmission makes conversion packages for installing Metric Overdrives in older vehicles. A 200-4R should bolt right up to the Pontiac engine. You'd need TV cable, all the Metric bolts and nuts, a speedometer setup, etc. Their packages have everything but driveshafts, crossmembers, and shifters. The yoke and transmission length is the same as a Turbo 350, which is what your Trans Am should have come with from the factory so the driveshaft should be perfect. Tell them your rear gear ratio and rear tire height and they'll gear the tranny so your speedo will work perfectly.
Jim
1994 S15 Jimmy LongRoof w/EFI LT1
1999 B4C Camaro 1-of-25
1966 LTD All-Original
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