I recently picked up a used 5 speed and transfer case for my 87' 4x4. The shifters were sold separately by the seller so the top was open and i could see that there is a lot of sludge buildup and a bit of dirt that had fallen in from the levers being removed. I dont know any history about the transmission other than it came from a truck with about 120k miles on it. I was thinking about using the oil that's in it temporarily to both test the trans and clean it a bit before ordering the correct gear oil and changing it out. is there any additive i can put in with the oil to help loosen any deposits before i change the oil, i feel kinda weird putting some relatively expensive oil in such a sludgy transmission that i know has some dirt that fell in. by the way it shifts through all the gears and turns over by hand ok i think and the outside was coated in dry sludge from the engine with no wet spots near the output seals or anywhere so the transmission/transfer case itself has no leaks. also does anyone know of a shifter boot for the 4x4 lever? mines cracked and i cant seem to find any NOS ones anywhere. im wondering if any other cars use a boot that would fit or a universal one?
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