jimmy tranny prob.

have a 98 jimmy 4x4 v-6.
tranny went out a year ago and had a shp do a rebuild on it.
worked great til a month ago and wants to shift in and out of overdrive now. code said 2 to 3rd shifter problem. took the pan off and replaced the filter and fluid. wasnt sure which one of the shift mods was which so i took them all out and cleaned them took out the rods behind them as well and cleaned them too.
doing good now but i am sure it wont last. which one is the 2nd to 3rd up shift????? any help would be appericiated
thanks

Are you sure it's falling out of over-drive,,,,,,or is it the converter unlocking????? is the oil burned?????
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the fluid is fine i changed it just the other day and the fluid and filter was fine no burned fluid and excess shavings. all looked good.

I am having the same problem with my 98 I was told that larger tires caused it and there is no fix other than to remove the tires and go back to stock these are only 9.30s so thay are not thqt much bigger but it acts up in drive at around 45-50 mph and smooths out at 60 def can feel it and see it jumping in and out of overdrive on the tach tach stays steady when the truck is in drive 3 and not allowed to use over drive got any ideas for a fix?

the fluid is fine i changed it just the other day and the fluid and filter was fine no burned fluid and excess shavings. all looked good.

Did you change the filter?