Auto Transmission Question.

[nipo]

I have a 1990 240sx and right now it is shifting between 3800 and 4200 rpms. And when it shifts if feels like a bad driver driving a stick. I was told it was the transmission module. When i bought the car the owner gave me a 1994 convertible auto trans. Will the 1994 trans work in the 1990? Also has anyone heard of the transmission module causing this problem? Thanks in advance

[180fan]

the transmission will work. haven't heard of the transmission module doin it.

[nightkid86]

what about that little connector on the fender that "smoothens shifts"

[nipo]

What connector are you talking about? And if it smoothen shifts, can it also adjust the rpms its shifting at?

[nightkid86]

it's a connector with 2 wires going into it on the driver's side fender under the hood. It doesn't control anything...just smoothes the shifts somehow

[benemorius]

It's a dropping resistor which serves to lower the transmission fluid pressure. Unplugging it results in higher pressure causing more aggressive shifting.

Don't forget to check the transmission fluid level. It's no magic fix, but correcting the fluid level can resolve a good many auto transmission problems.

[nipo]

So i should check the cable and get the transmission fluid changed before i buy a module and or do the trans swap?

[benemorius]

So i should check the cable and check the fluid level myself before i buy a module and or do the trans swap?

umm.... yeah...

[ricebike]

as discussed on here

bud, my offer to let u borrow my FSM to do an automatic trans diagnosis procedure/trouble code reading stands; u just gotta venture out to cherry hill NJ to borrow it!

[nuts510]

before you go to all the trouble of changing the transmissions out check the throttle position sensor they are wired into the computer that controls the shift points and do have a big effect