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Th-350 vs. Th-200r4

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Tunedup

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Anyone have any befor and after 1/4 mile times? I want to know what tranny will put the most power to the ground.



Thanks.
 
You'll need to be more specific.

There are so many variables when it comes to these two units.

A TH-350 can be built with a 2.75 low gear or the OEM 2.52. It can have lighter internals than stock and bearings added to reduce friction loss. It can be lock-up or non lock-up. It can be fully automatic, full-manual and can have a trans-brake.

A 200-4R can be built with additional bearings and can be lock-up or non lock up as well. It too can be fully automatic, full-manual and can have a trans-brake.
 
Well I was kinda hopeing someone swaped a t200r4 for a t350 and could post time slips they had with the 200r4 and the t350 noteing any changes they made between the 2 tests. I know the difrence in 1/4 mile times between the t400 and t350 is about .4-.6 do to the t400's additional rotating mass. If noones done the swap does anyone know the weight diffrence between the t350 and 200r4?
 
Tunedup,

Back in August of 1991 we did this to our 86 GN. Weather was about 80* and low humidity. The 350 was built to be full manual and we were running a B&M 3000 stall torque converter. Best pass of the day was 12.34, best mph of the day was 107.91 and the best 60' time was 1.623. This was with my father driving.

We went back a couple of weeks later with the 200-4R (and Art Carr 9" 3000 stall) when the temp was about 70* and low humidity, but now we were running into a strong headwind. The tranny wasn't shifting 2-3 very well and the best et of the day was 11.925, best mph was 110.56 best 60' was 1.538. This was with me driving.

With the 200-4r I made 3 passes that day in the 11.90's, 3 passes over 110 mph and 3 passes with 1.5xx 60' times. The worst 60' was 1.601, worst et was 12.008 and worst mph was 109.48.

At the time we felt that the B&M torque converter was too loose for our car, and my father didn't like manually shifting the tranny while going down the track. I am sure that with some work we could have gotten the TH-350 to work better for us, but it was easier to put one of our 200-4R's back in.

Good luck with whatever you decide,


Paul Beal
pbeal@sympatico.ca
 
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