Just before getting home (after about 3 hours of hiway driving) my 04.5 with a 48RE started shuddering and hi reving at stop signs and stop lights. It was shifting fine and the revs would come down and the shuddering would stop if I put it in neutral or park at the stops. Any ideas? Can anyone remind me how to retrieve the trouble codes? I've done it before but since forgotten how. Thanks

 

Sounds similar to my case. It was my torque converter not disengaged

 

I had a very similar problem and I think it was due to running the tranny low on fluid, heating up the TC and it not disengaging. Check this thread out.
http://www.cumminsforum.com/forum/3r...-please-2.html

 

Thanks guys but I'm not low on fluid. Had the valve body replaced about a year and a half ago and haven't driven it much (maybe 12,000 mi.) since. If the TC is screwed up do I need to do a complete rebuild? Sorry for my ignorance but this is my first (and last) auto tranny in a diesel. Thanks again and any further advice would be greatly appreciated.

 

my t/c locked up as well. is there any way to unlock it?
I'll most likely be going to nadp for a heavy hauler series..