(seems like I have to post a question without searching archives since I haven't posted in so long-sorry if this is a repeat)

So, it seems like my truck wants to shift in wild ways at the high speed end. Like when driving down the highway, gaining speed after entering, you hear the gears climb up as we approach 50-60, and then it either never shifts to 4th/overdrive, or worse, shifts all the way through, and then DOWNshifts back to to 3rd at 65, and flutters around, back and forth.

it also does this sometimes when cruising at 40 to 45mph.

My first worry is always that it's my veg system, but the engine itself sounds great, RPMs zooming up, no mis-firing or anything... and I've now done enough testing while keeping it in 'store-bought' diesel and it does the same thing.

I also keep checking trans fluid, as I have had a leak in the past... but that seems fine too.

I do have the overdrive button, and no I never mess with it - I don't pull things that often.

anyone have this shifting ghost?
could the TPS somehow be confused by my fuel type? if it is the TPS, do I just get a new one, or can I fix the old one?

thanks, as always, for this great resource of advice.

 

Sounds like what my tps did when it went bad on me. I just recently found a source to get the tps for like 100 bucks. I think they are usually near 200 bucks. You can also install a potentiometer. Look in the sticky there is a thread there on how to install it.

 

From my experience I had everything go bad the transmission was bad and the overdrive wire for the switch had come out or something along those lines so replaced the transmission and reran the wire and then still no overdrive gear. Turned out the switch was bad... replaced that and then finally it was the TPS and after replacing that everything worked. But my truck would do the same thing on a rare ocassion I might get fourth and sometimes it would stay other times it would flutter. So it could be multiple things.. just my story.

 

Sounds like a flaky TPS to me. I think the best fix is installing a standard Dodge gasser TPS, there's a writeup in the sticky. Those are around $40 new - plus the junkyards are full of 'em.

 

There is an article in the sticky about how to test the tps also.