Fitting a TH-200-4R to a 1976 Pontiac V8

I've been looking into doing the same swap (350 to a 2004r) It should basically be a bolt in due to the fact they are the same length. The 700r4 is about 3 in longer, so it would require a shortened driveshaft. Im confused about the application though, are you hooking it up to a 76 engine or putting it in a 76 pontiac? If you are putting it in a kit car, just make sure you change the trans-mount location, keeping the right pinion angle. This should not be too hard, it is the same spot as the TH400. Also you will need to put on a torque converter lockup kit on it or convert it over to a non-lockup converter. The lockup is not that big of a deal, you can find schemadics of how to build one on the net. Also the stock 2004r can only handle about

330lb/ft, so you might need to beef it up. Talk to some turbo GN guys of hints to strenghtening it.

Bird79

1979 Firebird Esprit 1973 455 YC

I've currently got the stock TH-350 fitted to my 400 V8 but would like to change it for a 4 speed auto. Can anyone offer any suggestions regarding what trans to use and how to complete the conversion.

Note - the engine is in a kit car and already has a short propshaft so the longer TH-700R4 may not be suitable!

Thanks Steve

The stock TH350 is pretty bulletproof and should be left alone :).

You could fit a THM2004R among other trannies in this, but the TH350 is about as bulletproof as they get (save the THM400) :)

Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....

Joe

I think the point is to make the vehical more street friendly. Besides, GM AOD's handle power as well as stock TH350's do. I have killed my share of TH350's. Charles

Charles:

If that's the case, use a 4L80E (an "electronic" THM400) and have the benefit of computer controls at the helm for better streetability :).

Sure, you can waste a THM350, as you could a THM400. For the rest of us normal folk (lol), it will last the life of the car.

Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going....

Joe:

I usually do recommend the 4L60 or 4L80 route to customers looking to upgrade to a GM AOD. Yet some still insist they want a TH-200R4 or a TH-700R4. Using things like vacuum actuator switches from 86 full size vans, instead of the aftermarket computer boxes.

Really I like to see people convert over to 90's fuel injection, ecm, & GM AOD. Then they are not just using less fuel above 40 MPH (depending on final drive ratios), they are usually running cleaner, with a balanced system. Charles