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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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#227 of 236 Re: No light on push buttons on dash and no 4X4 [coldshot02] by green39b Oct 07, 2009 (8:57 am)
Replying to: coldshot02 (Oct 06, 2009 5:38 pm) Thanks for the response above. I actually had the chance to use the dash switch from another truck with functional 4wd (all lights flash during start up). The other switch did not make my 4wd work and when I installed my switch into the other truck the red neutral light flashed once during start up, but the orange lights on the other buttons did not flash, or ever light up. I tried to engage 4wd in the other truck with my switch and nothing happens (making me think bad switch). I will try to get the truck on stands to see if the front driveshaft ever turns (working by myself). It's hard to believe that both the switch and either the actuator, or encoder went out at the same time. 15 amp fuse on side of dash is good, had a loose ground on battery, but did not solve the problem. Does the 4wd operate through one of the on board computers? Can there be 4wd codes and not show a warning light?
#228 of 236 1989 Chevy Silverado 4x4 Problems by bhanley55 Oct 07, 2009 (6:22 pm)
I havea 1989 Chevy Silverado 4x4 with a 5.7 liter motor and when I engage it into 4 wheel drive (4 wheel drive stick is on the floor and not a push button) it seems as if it is in low range because the gearing seems to change but when I gas it in dirt only the rear wheels spin, the same goes for 4 high. Also the light on the floor shifter does not light up.   I read through all of the forums and have seen that it could be the front acutator on the front diiferential or the encoder on the transfer case, but my question is that all of the other trucks were newer and were the type with the push button 4 wheeldrive. Could anyone tell me if they could or would be the same? If anyone has any suggestions please let me know because I miss my 4 wheel drive!!! Thanks! Replies to this message: zolten150 (Oct 12, 2009 4:03 pm) justintyme8303 (Nov 08, 2009 11:21 pm) 383stroked (Nov 17, 2009 5:35 am)
#229 of 236 04 Silverado transfer case by maw3 Oct 09, 2009 (8:36 am)
I have an '04 Silverado with the push button 4WD buttons. I just bought the truck used and it seems to be blowing the transfer case fluid out the vent line. I drained it a couple of weeks ago to see how much fluid was in it and only got about a half quart out. I refilled and it's low again and I keep getting the Service 4WD message intermittently. Does anyone have experience with this problem?
#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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