Hi Guy's this is my first post, hope it's as good as all the rest, I'll try and make it interesting...

I have an old Uhaul yep, I don't know why... It seems its the 4R100 tranny non pto of course and 2wd version.

I drove down the rd. after bleeding the brakes, new caliper front right, came home let it idle for about 10 min, shut her down.

Went to move it about an hour later, it went into reverse no problemo, then when put it in Drive it revved like it was in neutral.

There was no banging, no clunkin, nothing to make it seem like something catastrophic happened.

I then did a line pressure test and Reverse was fine 200 psi for sure, in drive mode however it was low like around 50 but had to rev real high to get it to 150 like 3/4 pedal and it would want to seem to go forward at a crawl but nothing more.

Next I did the obvious and cheked the fluid, it was about 1/4 quart low so added a bit. The fluid did not stink and was beautiful red like new.

I then tried again... no dice same scenario.

Then took off the pan, no metal chunks and virtually no dust on the magnet???

ok so I figure maybe something with the shift valves? Took them all off and the accumulators as well, all check ***** were in place and all valves moved freely.

Now onto the the solenoid pack, checked all per manual for ohms and all were perfect reads at about 27 Ohms, except the EPC solenoid that is the big one on the pack, it should read about 3-5 ohms but this guy is about 12.5 ohms.

I spoke to a tranny shop in town and they said it would not be the EPC and that I could "unplug" the solenoid pack and It would still move forward without it but not to drive like this as line pressure would skyrocket?

Im on a tight budget and working on my back. I am willing to take the tranny out and bring it into town but thought someone might have a few suggestions before I do that?

Personally I think it's electronic but I don't know ...

Why THis thing would have 200 lbs pressure for reverse and so little for forward I mean? that should mean that the pump is working great, if there was a broken something metal I figured I would hear something rubbing or banging or see some shavings?

Can this be a "worn out" valve? or gasket issue? all the check ***** are in place and "seem" good...

I really want to avoid removing the tranny at all costs so if there is something I am missing let me know and if you think just yank it out I will.

THanks Guys for any help you have, my family appreciates it very much.

Dave

 

Didn't I just answer this? I'm not typing all of that again into this cross post.