Pirate 4x4 banner

1 - 7 of 7 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
Hi, i am new to this forum altough i am membe rof several other ones :shaking:

Its been now 4 years that my 1985 pick-up truck has lost its 3rd gear, when i go, it shift from 1, then 2 then 3 but immediately goes to od...i carefully followed FSM check list, i replaced the shift solenoids and ECT ecu, nothing.
Still no 3rd geard.

The missing gear is actualy there if i disconnect the ECT i can access it "manualy", so the clutches are not dead.

I am thinking something wrong into the valve body.

I made a horrible amount of searches for this particular problem, no one seemed to find the cure other than replace the whole trany.

I opened once the valve body and found that the plate that is in between the two halves of the lower body valve got one of its hole damage (worn) and then one of the check ball might have difficulties to close this oil passage...but i dont know, i am not a transmisison specialist :grinpimp:

Any idea ?

btw: i am searching this metal plate (clad seal) new, or a very good one used.

I found a rebuild kit with one in it for 75$ plus shiping...
thanks for any help !!!
 

·
Premium Member
Joined
·
15,352 Posts
seals or clutch pack--or loss of fluid or or or..

Open it up..
 

·
Registered
Joined
·
2 Posts
Discussion Starter #3
i already opened that bast$#%

seal maybe, clutch pack, surely not, all the gears are there with "manual shifting".

thanks.
 

·
Registered
Joined
·
119 Posts
If there are any wiring problems, speed sensors, anything electrical, the OD light will be flashing telling you there is a code stored. If there is a mechanical problem with a solenoid, there will be no code. What size tires are you running? Does it do the quick shift with the power button on? You can get the plate from the dealer, they're not that much. Be sure to check the seals on the accumulators.
 

·
Registered
Joined
·
161 Posts
try changing out the TPS...if you did all the checks according to the fsm it should have pointed you in that direction. When you unplug the wiring harness and go through the manual checks it tells you that if you manually shift and everything works like it is suppose to then it is not a mechanical problem. I would be willing to bet that if you put a different tps in it you wont have the shifting problem any more.

I had shifting problems for 6 months and slowly everything went to the point where i lost 4x4 low all together...went through all the checks even hotwired the 4low solinoid to make sure that it wasnt my tcase. I even pulled the tps off and checked it like the fsm says to using a multi-meter and it tested fine...then i dialed it in on the throttle body and it was fine however it still wouldn't shift right. Finally I changed out my tps with one from the wrecker and everything has been good since. TPS's are finiky..a bad one can test good.

Alternately it could be corroded wiring. I was at toyota a few weeks ago and mentioned that i have had issues with my OD for a few years now...pretty much since i started doing 4' deep river crossings...they said it is common to get corroded ground wires in the wiring harness. The problem is at the harness on the passenger side of the engine bay. If you cut open the plastic wire loom you should find 3 or 4 brown or brown and white wires that all join together. Aparently you can get excessive corrosion and this will cause dirty shift signals which can result in missed shifts or "searching" for OD and gears. I haven't opened mine up yet but hope to in the next few weeks to see if i can get my od to work properly again.
 
1 - 7 of 7 Posts
Top