I am new to this forum. I am having problems with my auto transmission in my 1990 pickup. It shifts from 1-2-3 very smooth no problems....then when it goes into overdrive it shifts a bit more rough. When I am driving down the highway it will randomly down shift into third. Then it will not go back into overdrive right away....then eventually goes back into overdrive extra rough. The fluid in the tranny is full but has no color to it and is very thin. Any ideas on what i should do or what the issue might be would be a huge help.

 

i have a similar problem as well, after searching i think i need to replace the solenoids.
There are a few threads on the forum that may help you

 

as a cheaper alternative and a better idea. Change your transmission filter and fluid. Only about 30$ rather that 200$ or more for the solenoids.

Its very easy to do and can be done in about 30 min or less.

Just make sure you wipe your pan down with a clean lint free cloth when u get it down. Make sure there are no shavings or other problems lurking

 

Thanks for the replies. i figured either electrical or it needed new fluid/filter....i am curious however if any there is any vaccum/vaccum lines involved with the trannys

 

I'm having similar prob. on a 93 4runner V6. 1-2-3 no problem but getting into overdrive takes ~5 mins of initial driving. After that no issues. Have completely flushed tranny,(again thanks for the tread on that one). Does this sound like solinoid or possibly a vacuum issue?

 

these trans are electric it could be a solenoid issue, might want to look over the manual for the auto trans or in the fsm

 

Thx Justin. Thought the flush would fix it. Dollar to doughnuts its the solenoid. Anyone bought one lately...~cost?

 

its supposed to do that. you are trying to fix a problem that even really isnt a problem.

its designed that way so the engine warms up faster.

 

Toyota uses the engine temp sensor to lock the trans out of overdrive until it reaches a certian operating temp... This is normal operation and means everything is working like it should.

 

http://www.pirate4x4.com/forum/showthread.php?t=587521 go there lot of info on the a340 and here for the parts

http://www.makcotransmissionparts.com/97420K.html

 

Ya I looked up the shift schedule and once its warm it's w/in shift range. So thanks for the answers.
I have replaced CV axels and upper/lower ball joints. Had a gnarly kluncking noise upon braking predominately on passinger side. Ball Joints needed it, but still have cluncking noise upon braking, (usually deminishes after a few stops and turns). Feels like I'm popping something into place like poppin your knuckles. Guy who did front end allignment noticed it, but didn't give diagnosis. Could this be idler arms? The computer didn't kick it off the allignment machine.