This trans used to do this on and off..... never tried to troubleshoot it. Trans was freshened up and had machining done to the pump to ensure proper clearances and sealing.

 

Yea. Its only done it once. But I haven't had it that hot but once. You told me about it when I bought it. So I knew about it ahead of time.....

 

TTT.

I want this thing fixed before I do a whole lot of towing and get the fluid good and hot.

 

mine does the same thing..maybe its the PI TC?

on edit. mine never did it until i did the pi tc and vb.

 

:whs:

Mine did it once.

 

My PI did that when the sprag was fubar. But it was all the time, not once in a while.

 

mine does it everytime i put it in reverse from first start up but after i have driven it, not so much

 

Im starting to think it might not be the Solenoid in the valve body since your having the issues running a new BTS Valve body.

I dont know anything about the valve body in this trans..... Except that its fairly new I think.


Thomas: Are you having any issues while in Drive?

 

When my sprag was no good it would sometimes stall out when I put it into drive as well.

 

It's a Transgo Tugger 2

 

no, just reverse. btw my Vb is BTS.

 

My VB is stock with a sonnax/tricumulator.

 

buddy has an 01 that does the same thing. trans was rebuilt and torque converter went out. installed new pi converter and installed the spring in the pump that came with the converter. now whenever its warm she stalls in reverse. pi techs told him that pump was possibly leaking. any thoughts before he throws a pump at it?

 

Locking in reverse indicates low pressure. It could be the pump, or it could be a leak elsewhere.

 

The last time this trans was gone through, the pump was machined to bring clearances back into spec. Mark, why does it only do it in reverse?

 

Mine only did it that one time... I wonder what causes that?

 

Well, I got my problem fixed.

It was a stuck valve in the valve body. Had it replaced with a new one and no more problems so far.

Also, the shop said my trans filter had a hairline crack in it... So that was replaced along with all new fluid.

 

I know this is an old thread I found it by doing searches cause I have the same problem with a PI converter. The trans has not been built yet only cause of cost . Hopefully this winter at BTS. I bought the converter from him. It has had some Sonnax parts in the accumulator valve body. (correct name I hope) The small valve body that comes down before the big one. Farm Boy I hope you can pick this up cause was it a stuck valve in the main valve body? Which one, please?
Also my truck has no second gear , or it will not shift out of 1st. Pressures are pretty normal, Except! in reverse it climbs to well above 100 and needle fluctuates. I gonna run another pressure test and then drop the pan.
Many thanks to anyone who might take an interest in a five year old topic. Also mine is a 97 with E40D. Pan has Always been clean. very clean.
LW

 

Sweet!

 

my truck does the exact same thing.

 

I don't know enough about either of those to know if they require more fluid.

 

hmmm good to know, id just have to see what the good ol boys that did the instal would be willing to check it out under warranty or not. but worth checking into for sure. thx

 

Well Damn It! It tried to lock the converter again yesterday as I was trying to back a trailer in my driveway.

Its going back to the transmission shop on Monday. I'd take it today but I'm afraid i might not have it back in time for the racetrack on Friday.

 

Just curious if all you guys are only having these problems at operating temps? Mine only does it when the trans is cold, once it warms up it doesn't do it.

 

Thomas,

Bring that truck on by. My 01 did it once in a blue moon running a PI conveter and BTS valve body also, but it was very sporadic and i never did figure out a solution. brian told me once it was a low fluid issue, but i checked it and never seemed to be a problem. It definately seems to be a trend with the PI converters tho, but whats weird is ive never seen a full BTS tranny do it.

 

Thanks for the offer chris, let me get some time off and ill bring it down.

 

Truck went back to the trans shop this morning. They swapped a working valvebody, and some solenoid?? to my trans but the problem didn't go away. Trans is getting pulled today and they'll take a deeper look inside.

Seems like most everyone that's had this problem is running a PI Converter....

 

Just FYI, it did it with two separate PI converters when I owned it.

 

Jeeze. I'm not sure if that's good news or bad at this point...

 

I was just letting you know that it was doing it with my old PI convterter...then got a brand new PI converter and a rebuilt pump, and it still did (does) it. Either it's a design problem with the PI converters (or more than likely, in my opinion) it's not the converter at all.

 

I was just letting you know that it was doing it with my old PI converter...then got a brand new PI converter and a rebuilt pump, and it still did (does) it. Either it's a design problem with the PI converters (or more than likely, in my opinion) it's not the converter at all.

And I appreciate any info you can give me on it. I'm stumped at this point.

I was almost hoping that it could be the converter for a minute. Replace that, then its done. Now that you informed me that you had 2 diff PI's in the truck, it helps narrow it down a little.

 

Well according to Mark, it is a pressure issue. You have replaced the cracked filter, and it still does it, fixed the stuck valve and it still does it, the previous owner had a brand new pump installed and it still did it, so from what Mark mentioned your next pressure issue would be an internal leak of some sort. I don't know enough about these to even know how or where you would look to find an internal leak.

If you were to pressure test the trans and it showed that you had weak pressure then you would still be looking there, but what if the test showed that you had good pressure? Then where do you look?

That might narrow it down enough to where we can tell if it might be a PI issue or not. But in my case I had a different PI in for several months without this issue, then after it was built again and a new converter it started happening, and there are plenty of members on here who do not have this issue with the PI, so if it is something with the PI converter it seems like it is hit and miss.

I want to test pressure on mine, does anyone know what good pressures would be? And if pressure is good, what's next in the testing process?

 

I don't know what the inside of a PI converter looks like. I can speculate that there is a design problem in the converter causing leakage. Just a SWAG.....

 

I had this problem and ats explained that the way the pump on the 4r100 it leakes inside and it causes some sensor in there to go bad thats why the TC gose into lock up in rev.

Im not sure if thats exactly what happens but thats the way I understood them.