Loosing alot of PRM's 2-3 shift

farm boy · Feb 6, 2013

Locally built transmission. Was built really well, with a triple disc converter.

Back story: I put my foot to the floor for a bit, road was wet and I stayed in it. In 3rd gear, the truck fell on its face. Acted like it de-fueled, CEL came on for about 5 seconds, then it picked back up, and continued to run fine. No CEL.

Now, during the 2-3 shift, the truck looses alot more RPM's than usual. Im guessing it has something to do with TC lockup. ??? Its a dog for a little bit till I build some more speed. 3-4 shift seems fine.

Any thoughts.

seeyalater5.9 · Feb 6, 2013

something with stall speed maybe?

Gearhead · Feb 6, 2013

where is the truck brake stalling? if the converter is too loose (higher stall) it will cause larger than normal rpm drops when the converter locks because of the larger difference in locked and unlocked.

farm boy · Feb 6, 2013

Ill check on that tonight when I leave work. But why would it start it all of a sudden? Started after I beat on it a little.

The road was wet, tires were spinning. Nothing grabbed and broke as far as I can tell.

Gearhead · Feb 6, 2013

oh... well it was really hard to tell what was going on in the video.

Dieselboy. · Feb 7, 2013

Can you build boost if you load it up to launch ? Might have broke the spray in the converter

farm boy · Feb 7, 2013

Left work last night, and the truck runs normal. All shifts are right where they have always been. Definitely different than what it was doing before I parked it a few hours earlier.

Got on it a few times last night to see how it shifted under a load, and it never missed a beat.

Gotta love it when a truck heels itself. :doh:.

Thanks guys.