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Old 10-09-2010, 12:24 PM
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Overdrive onto a pontiac 400

Ok, wanting to put an overdrive into my 78 trans am, with a pontiac 400.

If i use the 700r4, with an adapter, option will i need a special torque converter?

Will a 2004r take the torque?

just need some advice!

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Old 10-09-2010, 03:08 PM
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Roy I had lower 2.75/1.57 first and second gears installed in my Turbo 400. With my cars 2.56 posi it's a blast to drive! Takes off like a gasser and cruises at 2100 rpm at 70 mph without that clunky od kicking in and out...

I also have a Continental 13" converter that was designed for the brute torque of a Pontiac...

I have a 4L80 in my Chevy 3500 and a 200r4 in my Olds 98.. I wouldn't want either in a performance car with the brute torque of a big Pontiac..

Try the low gear set in a Turbo 400 with a series rear end.. You will be pleasantly surprised at the street performance..
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Old 10-09-2010, 04:50 PM
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I agree with pitts on the torque output of the old poncho motors. I ran a 700r4 behind one for a couple of years with good success but i didnt care for using the adapter plate. extra bolts that can come loose,spacers on the flexplate ect. I wished id have ran the 200r4 instead. however you will need to put a good bit of money into either tranny it to get it built up to handle the additional torque.

Those engines make such great torque I had a 3800 pound lemans that worked great with a turbo 350 and 256 rear gear. I drag raced with the first two gears just like a powerglide and then cruised home in third...It works great as long as you dont have to much cam.
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Old 10-09-2010, 05:51 PM
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Quote:
Originally Posted by BigRoy1978
Ok, wanting to put an overdrive into my 78 trans am, with a pontiac 400.

If i use the 700r4, with an adapter, option will i need a special torque converter?

Will a 2004r take the torque?

just need some advice!
I have used the TCI adaptors both ways- to use a BOP trans behind a Chevy engine and how you want to do it, as well, i.e. a Chevy trans (TH400 in my case) behind a Pontiac 468 in a '80 Camaro w 3.31 12-bolt. The adaptor works fine, the Camaro went effortless 12's- even when left in "Drive".

As for a TC, you would want to get w/a knowledgeable converter guy and talk over your combo. I would say to do the same thing w/the trans guy you choose, if you choose to go this route. Either the TH700R4 or the TH2004R can be made to last but they ain't cheap. Most guys who take the plunge will opt for the TH2004R, due to the better gear split between first and second.

A good rear gear for this w/a Pontiac engine will be either the 3.42 or 3.73. The ratios for both:

Trans--------1st-----2nd-----3rd------4th
TH350-------2.52----1.52---1.00---------
TH200-4R----2.74---1.57----1.00-----0.67
TH700-R4----3.06---1.62----1.00-----0.70

THIS page has many links of interest for the TH2004R. Don't neglect to check out the turbo Buick sites- they make the 2004R live behind a LOT of torque and HP.

Last edited by cobalt327; 10-09-2010 at 05:58 PM.
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Old 10-10-2010, 09:02 AM
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I was looking at the 2004r, just because it would be SO much easier to get together! My engine isnt a monster, but it makes some power. stock heads and compression ratio, big cam, intake and carb, it will run high 12's with 3.73's and street tires, if it hooks.

The trans in the car is starting to go, so im looking into something to swap into it.

I dont drag race, no strips out here. I only get on it on the street every once in a while, mainly i just drive it daily. So the OD would be nice to get the highway rpm down, and let me run 75-80 without being able to see the gas gauge move lol
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Old 10-10-2010, 10:26 AM
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Neither the 700R4 nor the 200-4R will live behind your engine in stock form. Either can be built to survive with aftermarket parts. The turbo Buick crowd has found and fixed every weak link in the 200-4R. Parts are readily available to allow it to live behind 9 sec Grand Nationals. I'd go with the built 200-4R (as I am for my 455 Olds in a Custom Cruiser).
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