Tranny Slipping?

Doing some wheeling about a week ago and sheared a piece of the yoke. This caused some play in the driveshaft, broke the retaining brackets and snapped the u joint. Pulled the driveshaft out there and drove it home 4 wheel drive being easy on it. Put a new yoke, u joint, and brackets on. Filled the transfer case with more fluid. Started to drive it and it drove fine for a while then as I would drive the RPM's would go up and down up and down without me even pressing gas harder. Is this the tranny slipping? I drained the fluid in the tranny and changed the filter put more fluid back in. Figured maybe I had the nut on the yoke to tight so I unbolted the shaft again pulled the nut off, took the wheels off the back and started turning the yoke and tightening the nut again to get the right resistance. Drove it after that and it drove fine for a few miles then started acting up again. Could this be something in the rear diff. or is it the tranny slipping?

I'm still thinking this one over, but I think it may be the tranny unless the yoke splines are somehow sheared.

I'm in Roanoke also, PM me if you still can't find the problem and I'll check it out in person or help you find someone to help you!

Yea i've been working on this thing for a week now trying different stuff still nothing, wierd thing was when i drove it home in 4 wheel never slipped or anything, I think ima drop the drive shaft and pull it again, drive it in 4 wheel see if still slips. that should let me know whether its in the tranny or differential right?

Sounds like the RPM is changing or do you have a tach is just see it?

what gear is the trans in? possibly the TC is coming unlocked.

Try it in the "Comfort setting"

yea i drive it in the comfort setting all the time, never really click it over to power at all, and its just in Drive, not 3, 1-2.

Anyways it sound like the tc is locking and un-locking.
Check the TPS and the Speed sensor.
A dead spot in the TPS will do just that.

so the TPS sensor is worth replacing then. what if i pull the drive shaft and drive it in 4 hi and it quits does that mean there is something in the rear end bad?

there's no way something in the rear end could be slipping that badly and not make really bad noises. It's all gear driven.
The only thing that could slip and be quiet is the trans clutch packs, but I'm with Langer in suspecting that your TC is locking and unlocking, usually when a trans starts slipping it doesn't let the RPMs come back down, it just slips and slips until it overheats and dies.