correct so what i am saying is what would happen if you took them out. for instance with a man valve body when you down shift you do not want the reverse torque and it is also kinda a safety issue like if some idiot with a man valve body went from 4th to 1st it would not lock the wheels up and send u out of control. that is basicaly what i am asking. can what they do with a 350 be done to an 80?

 

I see what you're saying. Sure, you could do that. Leave out the piston, steels, and friction discs and plug the feed in the valve body. If you want to do something a little more simple, replace all the friction discs in the overrun clutch with a solid pack of steel discs.

 

sweet i am gonna look in to some other stuff. but it will be a while before i mess with it.

 

This seams like a good thread to bring back from the dead..........



I have a 4l80e question, What if I have a first and fourth soleniod problem (I think) and the trans won't go into first or fourth when the computer commands it. Is it going to burn up a clutch pack if I drive it? Sould I program it to skip first and fourth until I find my problem?

btw, The trans shifts fine other than every-once-in-a-while I loose first and fourth, but it's getting worse every day.... I'm just praying it is something easy? any thought?

 

The 1-2 shift solenoid is "on" for first and fourth. Whether or not it's safe to drive it like that depends on how it is malfunctioning. If it only 100% works or 100% does not work then there's no danger, but if it is getting stuck part way and bleeding it could smoke the clutches.

 

Well most of the time it works fine, but the other day I was driving to work and I had no 1st or 4th. I was leaving a stop light and going about 20 mph (in second) and nailed it the truck started to pull and then all the sudin down shifted into first...
I think I had better just not drive it in first or fourth....
JamesB, have you seen or heard of soleniods failing? How "rare" is it? I've already replaced my tcc soleniod, which seamed to fix my lock-up problems.....
Any sudjestions on a good brand to replace it with?

and
THANKS

 

The solenoids are electromechanical, they can wear out. I'm no trans expert but I have seen a few solenoids fail. It's usually 100% though. Intermittent problems can be related to electrical connection too. As far as brand, I just use whatever the trans shop has. They're cheap, I think I remember paying about $12 each. The 1-2 and 2-3 are different.
Do you know if the solenoids in your trans were replaced when it was rebuilt? Seems to me solenoids usually outlast clutch material.

 

Nope don't know anything about the trans..... Hell you've told me more about it than anyone. lol
I towed a buch of boats today and I made the trans only use 2nd and 3rd. after the trans got up to 180 in temp I tryed all the gears and It seamed to be fine all the rest of the day... Im starting to think its a electrical conection.. works some times ect....

 

Meant to say solenoids there instead of servos. Fixed. Stcking can also be the valve in the valve body. All the solenoid does is control the fluid that drives that valve which does the real work.

 

What causes them to stick?