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Chevy Silverado and GMC Sierra 4x4 Questions

236 messages,  Last post on Nov 17, 2009 at 5:35 AM

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#232 of 236 Re: 1989 Chevy Silverado 4x4 Problems [bhanley55] by zolten150 Oct 12, 2009 (4:03 pm)
Replying to: bhanley55 (Oct 07, 2009 6:22 pm) hey! i have a 1992 chevy silverado z71 and have the EXACT problem with mine. i replaced my actuator and it did nothing. it gears right when i put it in 4 high or 4 low and i know its not the transfer case because when when i put it in 4 wheel when the truck is off the drive shaft stiffens and i cannot turn it. my light does not come on, but i hit a bump today and suddenly the 4x4 light came on when i tried it and i had 4 wheel drive! but then i suddenly lost it again.. i went under my truck and jiggled a couple wires in the front end and it started working again. i feel it is just a loose connection with the wire and it is not sending a signal from the transfer case telling it to engage in the front end.. i am going to work on it tomorrow and hopefully fix it for good. if anyone can help us out on this please do asap!
#233 of 236 Re: 1989 Chevy Silverado 4x4 Problems [bhanley55] by justintyme8303 Nov 08, 2009 (11:21 pm)
Replying to: bhanley55 (Oct 07, 2009 6:22 pm) I am having the same prob (same truck too) but mine started after i just had the tranny rebuilt. not sure if had anything to do with it. I have been under the truck and all is hooked up.
#234 of 236 97 gmc sierra wont shift into 4wd by brigs3916 Nov 12, 2009 (8:01 pm)
So I have a 97 gmc sierra Z71 with an auto trans it does not have push button it has the 4wd shifter on the floor the transfer case engages and the front driveline is rotating when in 4wd I had replaced the actuator on the front axle figuring it was a simple fix and it is still not engaging any insight or help on this problem would be greatly appreciated thanks Replies to this message: bruce48532 (Nov 12, 2009 9:37 pm)
#235 of 236 Re: 97 gmc sierra wont shift into 4wd [brigs3916] by bruce48532 Nov 12, 2009 (9:37 pm)
Replying to: brigs3916 (Nov 12, 2009 8:01 pm) You say you repalced the front actuator but "its still not engaging" ? If you don't have push button on the dash what sends the signal to the front actuator? Possible it is something electrical to do with the fron actuator? May still be a simple fix? $20 for a Haynes Repair manual might be a good investment?   OR?   If the front drive shaft is rotating after manually locking in the transfer case and you have replaced the front actuator, then it sounds like maybe the transfercase is burned out?   My guess there is enough friction on the clutch plates in the transfer case to rotate the front drive shaft but not under load?   How many miles on the truck, I rebuilt my transfer case at 110k miles, it was not completely gone but did not work as it should. The clutch plates total apx 12 ? only 2-3 were worn out. Parts cost to rebuild the transfer case apx $150 and apx 6 hrs time.   Good Luck!
#236 of 236 Re: 1989 Chevy Silverado 4x4 Problems [bhanley55] by 383stroked Nov 17, 2009 (5:35 am)
Replying to: bhanley55 (Oct 07, 2009 6:22 pm) Try the t case switch, it looks like the one on the front diff that lets you know if your truck is in 4x4, the t case switch lets your truck know you have shifted out of 2wd,

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