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Originally Posted by Moser97
NP 236 CM, don't hold me to the CM the tag is banged up. It had red in it, and a tag calling for Dexron lll. I filled it with blue, drove around for a half hour, drained it and refilled with blue. It still chirps in a tight turn with the Auto 4wd on. I guess I'll do the differentials with synthetic gear lube next.
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The 99 gmc jimmy 236 calls for the blue gm fluid.
In auto mode the front axels/drive shaft should not engage unless the rear wheels are slipping.
You may need to drive it a while for the blue fluid to start working.
Are you sure the transfer case has not been replaced or switched?
If it keeps on doing it get a good scanner on it and check out the transfer case operation. If it has any problems it should show pp on a good scanner that can read transmission/transfer case and body codes and data.
Also most good scanners have some test you can run on it.
If it shows any B or C codes post back code no.
MT