20 Most Recent 1999 GMC Jimmy - Page 9 Questions & Answers

Hi Dwayne, the engine must be running to engage the gearbox. All the best with it. Greg.

how long is a piece of string ! depends what the problem is but it won't be cheap get a quote from a repair shop as might not be financially viable due to age of vehicle or it might be something minor , you wont know until you get it inspected

On this particular truck the transmission is known very well for the "Transmission overdrive section to fail". From your description it will probably need an overhaul, but caution: Is the truck worth it, these transmissions will cost anywhere from about $1400 up to maybe $2000 with parts and labor included. The transmission valve body is a common replacement also. Best of luck....

I got them from Pep Boys. Don't go to a dealer. Junk yards have lots of Jimmy/Blazer stuff. Ebay too.

is the front axle engaged? is 4x4 working? does the clicking stop after 20 seconds? first step is to check the electric actuator on the front diff. they get weak or stop working. hope this helps but need a more detailed description. can 4x4 be engaged while rolling forward or backward in neutral at 5 to 10 mph?

sounds like your tranny might be fried. Check the fluid on the dipstick on a paper towel if its black on the towel it might have gotten hot smell it for a burnt smell.

i would check for any LOOSE OR MISSING GROUND WIRES that were originally bolted to either the bellhousing/starter bolts or if the wiring harness that runs over the tranny and connects to tranny switches has been cut/damaged. you would be suprised how many problems can occur because of bad/ missing grounds!!

What brand of distributor cap did you use? When you say it won't crank, do you mean it won't even turn over? Or just turn over and not start up?

possibly faulty transducer on the transmission, I am assuming it has an electronic speedo

With the affected wheel in the air, one hand on the top of the tire, and one at the bottom, try to move the wheel back and forth towards you and away from you. If it's loose (more than an 1/8" of movement), yes you need a new wheel bearing hub assembly.

There is an adapter for the oil filter with 2 lines coming out of it above the drive shaft from the transfer case to the front differential. The O ring on these will go sometimes causing loss of oil. Also check the 2 lines for leaks and cracks.

If you run 12 volts to the motor itself is it running at high speed ?

you might have to replace the fuel pump as the small plastic gears need fuel to lubricate them and with out fuel they tend to mess up bad.

Ask a friend to help pump the brake while you look underside for leaks. KEEP brake fluid reservoir fill! Do a complete bleeding.

Drive reverse for 6 to 12 feets then switch back to 2H (if you can).