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Old 10-25-2004, 07:49 PM
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Stall wrong, transmission shift adjustment, suggestions?

Here's the scoop. . . my new 66 Nova has a 355, mild cam, making around 350HP, not a rocket ship, but enough HP to move a 66 Nova. The tranny is a TH350 with a shift kit. Under normal street acceleration, the tranny shifts very quickly, shifts to second at 10-12mph, shifts to third at 20-25mph. The shift is very hard no matter what speed. I should mention that this Nova has the original console, which will not allow the shifter to go into first, so the first to second shift is by the tranny in all situations. From a dead stop, holding the brakes and launching at 2,500 rpm's, the car performs great. Under WOT, the shift from first to second and second to third is at 4,500/4,700rpm's. Just taking off from a stop light, the car is a dog until it reaches about 2,000rpm's, then it pulls hard. The shift from first to second and second to third is always hard, and always produces . Is it possible that I have a mismatched torque converter, or do I simply need to have the transmission shift pattern adjusted? I recently checked the rear gear ratio by jacking one rear tire (no positraction) off the ground and two revolutions of the wheel produced just over 3 turns on the drive shaft, which I would assume to be 3:08 or 3:23?

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Old 10-26-2004, 08:18 AM
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Since you didn't build up the motor and trans you just may have a mild street strip converter and thats why it dosn't pull till 2000 rpm or better. Try some Sea Foam from NAPA and see if that helps your shifting...its a trans additive and I have had good results from it... YOU MAY need to drain a quart of fluid out of the trans before putting in the Sea Foam but it is good S**T and well worth the effort. OH yea...what are your rear gears? Just curious is all....this question has nothing to do with the trans problem.


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Old 10-26-2004, 09:24 AM
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what converter stall speed do you have?

Is the vacuum for the tranny hooked directly to the intake manifold?
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Old 10-26-2004, 12:59 PM
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I am out of town right now, but will check the vacuum when I get back home. I received an email from the original owner of the Nova and he said that he believes the transmission has the standard torque converter.

As for the rear gears, my wheel off the ground test resulted in 3:08. . . most likely correct. However, I am going to open the case and find out for sure.
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