Hi gang,

I've got a 1993, 2wd, E4OD with the 302/5.0 in it.
When the tranny is cold it seems to shift better than when its hot.

When it warms up the 1-2 shift is mostly fine, 2-3 seems to lunge back and forth......then it finally goes into 3rd, same for other gears. Sometimes in the 1-2 it will lunge back and forth then go into gear if im on light throttle. It does not do this ALL the time, but happens pretty often....especially when its hot.
I had the tranny flushed and it made it better, but still does this lunging thing.
Is there something simple that i can do to fix it? Maybe something electronic on the tranny itself? Or......what about a shift kit? I've heard a few people swear by them. How much do they cost (including install) and where would i get one? (if thats my fix)


Thanks!
Glade

 

A shift kit is not going to fix a transmission that is probably worn like yours likely is.

Short of a rebuild, about the only thing your can do is add a fan operated cooler to lower operating temps and supplement the ATF with Lubeguard.

In any event, your transmission is probably worn out and anything you do will only be temporary.

Steve

 

Hi Steve,

If it was worn out, or going......wouldnt it do it all the time?
Its intermittent, but can mostly be felt when its hot outside.

I did some research, some people changed the fuel filter and solved this.
Others had luck changing cap and rotor. BOTH would be cheaper, so maybe i will try that.

Thanks!
Mark

 

Transmission fluid thins out as it warms up. This allows it to go around worn seals and pistons more readily than when it is cold.

Additionally, accumulated valve body wear can cause pistons to stick or bind in their bores intermittently.

I have no idea how a fuel filter, cap, or rotor could fix a transmission problem. Engine power, misfires, or driveability - yes. A transmission that won't shift - no.

It's your truck, do whatever happens to crank your tractor.

Steve

 

I have no idea how a fuel filter, cap, or rotor could fix a transmission problem. Engine power, misfires, or driveability - yes. A transmission that won't shift - no.


I rebuilt a C4 twice .....wouldn't shift from 2nd to third under hard acceleration. Culprit......bad motor mount. How about the proximity of a wiring harness to the ac acumulator affecting milage... Will an engine in a poor state of tune affect a tranny....oh yeah. More specifically....will an E4OD be affected by a poor state of tune?!? I would think so as the computer still has to determine engine load to affect shifting. Does a tranny shift sooner going down a hill with no load, vs going up the hill. You bet. However, doesnt the tranny give DTC's as well?

David

 

Hi gang,

I just wanted to update you all that my surging and odd shifting problem has been fixed!

I pulled the EGR valve off the other day to clean it, looked into the tube, and could not see through. So.....today i pulled the throttle body off and was AMAZED at all the carbon built up. It took me about 3 hours to get it all out, but after i did that and put it back together i took it for a test ride. Smooth as silk!! I figure the EGR being completely plugged up and the massive amount of carbon inside the intake caused the problem. I also saw that the both sides of the TB coolant lines were clogged as well.
All i know is that after cleaning everything and taking it for a drive, it feels like a brand new truck!

If you have surging, stumbling shifts......check that EGR!!

-Glade

 

Chaulk up another one to an engine that is skipping and fooling the trans shift skeds if you turn out to be right.