transmission lock up issues

[cr8zchevyguy]

Hey guys new member here...... nice forum! I have a 98 2 door sport that has this issue with the torque converter locking in and out at about highway speeds....? Starts at like 45mph then 50.... 65....75....80.... only way i can describe it it feels like the brakes are applied kind of like shutter.....?? I did replace transmission filter and fluid with just a filter change.... 5 qts..... helped a little..... anybody have a clue? Thanks in advance.

 

[MO Viet Vet]

Hopefully a trans specialist will chime in but I think there is a torque convertor solenoid inside the pan area but I could be wrong?

 

[lesterl]

You have a worn valvebody I suspect......

 

[MO Viet Vet]

You have a worn valvebody I suspect......

Not questioning but am wondering. Really? How does that work?

 

[lesterl]

Valvebody is aluminum, valves are steel, aluminum bores wear, valve doesnt seal well and will start to act up when enough fluid bypasses valve, would be worse on a hot transmission vs a stone cold one as fluid would be thicker methinks.
(25. Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter: Need to verify line pressure, and provided no valves in the TCC (Torque Converter Clutch) hydraulic circuit are worn, replace the torque converter.)
TAKEN FROM (http://www.twincharlotte.com/transm...60E-Transmission-Problems-Repair-Charlotte-NC)

Not saying it is the VB, but could be a cause, also a slight missfire could cause it, if tuneup with quality OEM ignition parts has not been done yet, would highly recommend it. Also the distributor may have some slop in it causing some misfiring....

 

[MO Viet Vet]

Sadly, my knowledge of the inner workings of automatics is lacking. Thank you lesterl. Good call on the misfire possibility.

 

[cr8zchevyguy]

Ive found so much info about this issue.... from a faulty brake switch to faulty key ignition switch....... at 255xxx miles i am leaning towards a rebuilt!

 

[lesterl]

If you have 255k on her, probably time for a rebuild...... Hows the fluid look/ smell?

 

[cr8zchevyguy]

Yup ive done a filter and fluid change and it was pretty dark not bright red! Either rebuilt or a good used one..... im just waiting for it to take a dump on me.... i drive 70 miles to work, that's both ways, lets see how long till that day comes! Thanks for all the replies guys! Ill keep you all updated.....

 

[lesterl]

with 70 miles a day, I would opt for a good rebuild..... vs a used trans.......