truck refuses to go into 4th

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03-09-2013, 12:01 PM

framedragger

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truck refuses to go into 4th

i have a 1990 toyota pickup 2wd v6 auto (a340e) sr5. still having problems with it shifting.. but at times it shifts perfectly through all gears.. 30 seconds later slams back into 3rd. but it doesnt shift properly often.

heres the things if changed..

all solenoids
filter
throttle positioning sensor
kick down cable
torque converter
3 different water temp sensors
computer

what else is there to change? speed sensor perhaps??

thanks everyone for any info you have..

Last edited by framedragger; 03-09-2013 at 12:02 PM.

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03-09-2013, 01:01 PM

Co_94_PU

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Quote:

Originally Posted by framedragger

i think the auto transmission in these trucks were made to make us rip our hair out. i have a problem with it going back and forth from 3rd to 4th about every 5 miles. ive changes all the solenoids, tps, throttle body, water temp, temp sending, adjusted the cable, used sea foam, and even changed the computer.. the last thing i thing i can change is the OD button and if theres a part on the transmission... if i can find it. my truck is about to find its way to mexico soon...

Quote:

Originally Posted by framedragger

its wierd.. it doesnt matter the temp or anything like that.. it either drives normal, or it doesnt. it never slips makes any noise at all..

Quote:

Originally Posted by framedragger

so if come to the conclusion i have a bad torque converter.. ive call everyone known to man and 4 dealerships.. i am being asked how many splines the trans has.. nobody knows! im amazed.. lol so to my fellow toyota owners..

i have 1990 toyota truck 2wd sr5 v6 floor shift auto. a340e (30-40le)

someone has to know the spline count since our dealerships and parts stores are too stupid to have this info.. they asked if it 26 or 31 (i think) spline

Quote:

Originally Posted by framedragger

You don't give your differential gear ratio or the tire size?

FSM AT-60, step #3 throttle cable adjustment
FSM AT-61, Manual shift test
FSM AT-55&56, ECM Diagnostic
FSM AT-65, ECS troubleshooting flow chart

With the shift control set to normal, it will/should stay in OD once you get upto 89-94 mph with the throttle fully open and will/should stay in OD untill you drop below 90-85. (Good luck testing that)

Assuming you're doing the federal interstate speed limit you're probably functioning normally, it's shifting due to load differences your eyes aren't sensative enough to notice. Does it consistently down shift in the same stretch of road, that would be a hint it's not as level as you might think.