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I have a '91 Jimmy and when I am in 2 wheel drive I hear a rattling and slight grinding noise. I believe its from the transfer case. I used to hear this noise after coming out of 4 wheel drive, but then it went away. Now the noise is back, but isn't there if I am in 4 wheel drive. Is there a gear that's rubbing inside the case when I am in 2 wheel drive? Could the gear be slipping into 4 wheel drive? Whats keeping it from slipping into 4 wheel drive? Will adjusting the 2-4 wheel drive lever fix the problem. I have 330,000 miles. Thank you so much.

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pippall
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SOURCE: loud exhaust rattle/grinding

sounds like the baffles have come adrift in your exhaust sylenser

Posted on Jul 16, 2009

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SOURCE: GMC '91 Jimmy, Transfer case. When in two wheel

Yeah your right about waer but you might be blaming the wrong part. With the truck up on jack stands ( all wheels off the ground) have a helper drive the truck at the speeds that make the most noise you'll find it in the front axel or fround U joints or drive shaft splines ( drive shaft jumping ) You watch the parts moving and the joints or the cable that shifts the ront axel in and out not moving all the way it uses a vacume motor under the battery that has a cable going to the front axel. the clutches that are in the front axel have clips on them that hold the side gears that engage and disingage as you turn it on and off the clips break get lost fall off were out and let the side gears do as they please and they runinto each other a click and pop/ the cable and the shift fork that move them also fail but not htat much as the cable fails and the vacume leak pulls on a spring in two wheel and it may not be pulling hard enough/

Posted on Sep 17, 2010

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1 Answer

1991 gmc jimmy grinding noise.


I'm not sure exactly what the noise could be except that most likely it's in the drivetrain somewhere between the tranny, transfer case, or the rear-differential (AKA: rear-diff, rear-end or third member). None of which would be cheap to repair.

I'm pretty sure the intermittency you're experiencing is because whatever is causing the noise, is only worn & not fully gone yet, but will be soon. Unfortunately, I wouldn't know how to further pinpoint this noise, maybe someone else could???

Apr 10, 2014 | GMC Jimmy Cars & Trucks

1 Answer

I have a 2004 2500 HD My 4 wheel drive suddenly quit working I put in a new actuator My 4 wheel drive indicator light show I'm in 4 high or 4 low you can hear my transfer case shift but it still won't go...


May be the problem is not in the actuator in the case but in the actuator that engages the hub locks . Check for vacuum line / electrical wires faults . The noise may be from the hub lock or from a cv joint in that side.

Mar 09, 2014 | Cars & Trucks

1 Answer

Gmc transfer case noise


Did you do the work on the vacuum switch? The mechanic might have put it back on.

Jan 30, 2014 | Cars & Trucks

1 Answer

4X4 ok on drive position but disengage in rear


Regarding 4 Wheel Drive problems,
Always follow Owners Manual for when and how to utilize 4 Wheel Drive. In most cases it should not be activated when vehicle is moving. Automatic Transmissions with 4 Wheel Drive have a Transfer Case similar to that used with Manual Transmissions. Shifting between LOW 4WD and HIGH 4WD should be selected while the vehicle is stopped. Again, follow Owners Manual Instructions. If you hear strange Grinding Noises have a Certified Technician check out your vehicle immediately.

Sorry that you are having troubles but, it sounds like the problem is more than a simple fix to me. If your Vehicle has Manual Locking Hubs make sure they are in the correct position for use in 4WD.

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1 Answer

I can hear my transfer case shifting when i turn on my 4x4 but it is not working and there is no grinding nose or nothing like that.


if you can hear your transfer case switching then the problem isnt with your transfer case. their are three vaccuum lines that run out of your transfer case switch and if they are dry rotted or burnt in two from the exhaust manifold which is pretty common your four wheel drive will not engage your front differential. go to the auto parts store and buy about 15 feet of 7/32 vaccuum line and trace all the lines and replace them all. that will more than likely fix your problem.

Nov 10, 2010 | 1994 GMC Jimmy

3 Answers

GMC '91 Jimmy, Transfer case. When in two wheel drive I hear a slight grinding noise and rattling noise. When in 4 wheel no noise. 330,000 miles, could something be worn? What keeps the transfer case gear...


Remove the transfer case and strip it down,wash it out and replace whatever is worn.
330,000 miles is unrealistic
Your chain is worn and stretched for sure, and rattling and may be cutting into the case.
Don't install another salvage yard unit, unless you can not repair yours. Then strip down whatever you purchase, and go thru it also.

Sep 17, 2010 | 1991 GMC S-15 Jimmy

1 Answer

Have a 1993 f150 4x4 transfer case sounds like its engaging but there is a grinding noise when she goes in 4x4 only checked transfer case its fine could the hubs be gone over the summer with out use.


Try removing the front drive shaft from the transfer case to the front differential. With the vehicle on 4 jack stands and the front drive shaft removed attempt to place the vehicle into 4 WD. You may have to start the engine if the vehicle uses a vacuum actuator module to engage the front wheels. When you get an indication that the vehicle is in 4WD try turning the front wheels by hand and see it you hear the same grinding noise .... engage the hubs and try again. Usually if the transfer case is ok then the problem is in the front differential or one of the many universal joints that connect all of the elements together. Check the U joints on the front drive shaft for play as well as the U joints on each of the front wheels.

Dec 04, 2009 | 2000 Ford Excursion

1 Answer

I have a 1996 GMC Jimmy.. it has been stuck in 4 wheel drive for sometime..It is just the switch that needs to be replaced but now, I have a lot of grinding in the front in..For instance when I stop.. You...


That noise is the transfer case making the grinding noise because its onky designed to stay in 4wd for short periods only or you are running the risk of it burning out. What you need to do is to take it to a 4wd mechanic straight away or it may be costly.
Hope this helps and Thanks for using Fixya.

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1 Answer

99 Silverado 4-wheel drive not engaging


It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck

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1 Answer

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THIS IS 2 LITTLE PLASTIC TABS ON THE FORK IN THE TRANSFER CASE.

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