Auto Trans Failing

[2whlfreak]

Yesterday I was pulling a full 24' trailer loaded with logs and the bed was fully loaded, between a first and second gear shift there was a loud groaning. Then it didnt feel like it was shifting right after that. Any ideas?

[CT Performance, Inc.]

More info...miles mods..

[2whlfreak]

110K on the ticker, the truck is pretty stock, normal size tires, stock exhaust, no tuner. It does shift into 3rd pretty hard though, its done that since Ive owned it. I took it to a trans shop 3yrs ago and they said it shifting when its supposed to and all looked good on the scaner.

[ipz2222]

Sometimes, clutches that can't hold the load, groan, grunt, or chatter instead of just slipping. This is usually with good clutches and good fluid but low pressure. Ck fluidlevel first.

[2whlfreak]

I pulled the pan expecting to find alot of debris and much to my supprise, nothin. Nothing unusual, the magnet looked like a catapiler but so has every other pan magnet Ive ever seen. No shiny hard parts found. Could the problem be linked to a bad solinoid?

[ipz2222]

Bad solenoids are very rare. If you don't have a 300 lb pressure guage, you can't test the solenoid pressure control.
Is that the only time the trans made the noise?

[2whlfreak]

Did it again last night hauling a load of wood. Groaning sound between shifts, didnt catch if it was 1-2 or 2-3 shift (merging into traffic) maybe 30mph.