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Old 08-23-2005, 10:03 PM
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turbo 350- or 400?

hello everybody- im new to this site - i own a 69' Chevy Nova and im only 17 along with ebing that age and with that kind of car (with hopefully a new 383 stroker soon to be placed in it) i had a question of how reliable a tubro350 4 speed automatic transmission with either 3.55 or 3.73 gearing in a 10 bolt posi (wish it were a 12 bolt)- would be in this set up? or if i should just go strong with a 400

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Old 08-24-2005, 05:57 AM
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Welcome Rook! Good site here, and you'll pick up plenty of info.

First, a TH350 is a three speed, not four, as is the TH400. A TH350 can be rebuilt to handle plenty of HP/torque, and takes less power to run. I've seen estimates that HP drop through a 350 is around 30 vs 50 and up for a 400, so using a 350 is the way to go for a lot of folks. With a "normal" stroker small block, you're probably looking at around 400 ft. lbs. torque, and a good tranny shop can make a TH350 live at that level.

Also, it depends on what the car has now. A "short tail" TH350 is a direct replacement for a Powerglide; the TH 400 needs a different rear crossmember and shorter driveshaft.

With the way gas prices are going, you may want to consider a 4 speed (OD) automatic, like the 200 R4 or 700 R4. Each of those has it's own set of requirements, but generally the 200 R4 is a more direct fit and stronger.

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Old 08-24-2005, 05:59 AM
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By the way, depending on where you are in jersey, I can hook you up with a guy that rebuilds 8.5 inch 10-bolts fairly cheap, probably cheaper than you can pay someone to put a posi and gears in the 8.2 (if it is the original rear).
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