GMC Sierra Transmission

http://GM.autoboardz.com/HELP-needed-GMC-transmission-problem-ftopict248183.html (HELP needed with GMC transmission problem)
My 2000 Sierra just started having a problem with a server jump from 1st to 2nd gear. When starting from a dead stop and my automatic goes from 1st to 2nd on take-off, I get a very bad jumping jerk ..
« "Terry": Have you tried adding a small amount of brake fluid to the transmission fluid? It will smooth out rough automatic shifting. »
« "Arnie Quarry": I think that will smooth out his wallet as well..... »
« Arnie Quarry: Personally I prefer buttermilk. »

http://GM.autoboardz.com/90-GMC-Defroster-ftopict232334.html (90 GMC Defroster)
I hope someone can answer a question for me. I inherited my Dad's 1990 GMC Sierra 2 wheel drive PU. It has the 5.7L engine and automatic transmission. It also has factory A/C. The truck has 130,00..
« Bob M: Defrost/defog depends largely on the air conditioning system to remove moisture from the air. The compressor should be cycling whil.. »
« Hey Bob My 02 S-10 will defrost no matter what the temp. Good luck Pete "Bob M": »
« Bob M: Check to make sure you don't have the air flow on recirculate. You need outside air to do a good job keeping the windows clear. »

http://GM.autoboardz.com/type-transmission-1991-GMC-Sierra-ftopict215027.html (what type of transmission do i need for my 1991 GMC Sierra..)
I need a new transmiI ssion for my 1991 GMC Sierra 4x4 but I am not sure what type. I have been told that I can use a 700R4 or a 4L60 but I am not aware if there are different variations of the two..
« : A 91 would use a 700R4. You want a 85 or later one with a 30 spline input shaft. The 4L60 is basically the same tranny except it has a e.. »