Having problems with the vaccum system, my 1989 s10 2.8 L. Runs fine, but will not shift. Is it the vaccum system? I have it hooked up properly per diagram. Do you have any answers or can you send me a better diagram then my manual has?
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Well code 782 is for a problem with the 2-3 shift solenoid or the circuit back to the engine computer. The solenoid is inside the transmission.
Code 722 was for a problem with the speed sensor. You could have a wiring harness problem.
Check the Trans fluid level with it running and at operating temperature. Jeep NAG1 transmissions are known to have the input electric seal leak trans fluid. Not an exspensive fix add Mopar ATF4 and then relace the guild seal.
You will need a good manual that is focused on the transmission and possibly someone to lean over your shoulder to help you. Clean workspace is imperative. These are rather easy as you are for the most part stacking parts back into the housing when reassembling it. I would say look for a yard trans to put in it meanwhile and then you can learn at your leisure.