I own a 1990 240SX and the transmission is slipping. I've had it repaired twice but it
still jerks into first and second gear, especially when the engines cold. Is there
anything I can do?
Steve
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Re. 1
I don't know all the technicalities of auto trannies, but a lot of racers that i know that drive auto tranny cars give great ratings about having a performance upgrade done on your tranny. I'm not just talkin about upgrading your torque converter, but increasing the line pressure also. The results are that you will recieve crisper, faster, more responsive shifting, with more efficient power transfer to the wheels, and better gas mileage. It tends to be smoother also. If you are spending a lot of money already to remedy the problem, this may be an alternative. I did run into hard shifting problems in my mom's van before also. The Idle was held too high, forcing damage to the engine mounts. The damaged engine mounts allowed excessive movement of the engine during shifts and caused jerky shifting. I would check the condition of all the mounts from your engine to your tranny. It may also be a good idea to check all your driveline components to make sure nothing is loose. I had a 83 celica that had a driveshaft that was loose that caused some irregular shifting. And this was in a 5 speed. Hope this helps!
Chano
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Re. 2
Ya know mine does the samething when it is cold too. I'm using some Redline ATF works great. Make sure the fluid level is good.
Kawai
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90 240SX
Re. 3
Check out the throttle position sensor wiring. If the sensor is not working, it'll give you similar symptoms.
RogoMan
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Re. 4
What was repaired? Nissan does not encourage repairing their transmissions. Also, if
you use anything but Dextron II fluid, they tend to slip. Sounds like your valve body is
messing things up.
John
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