Comments on: What is making a clunk in the rear end of my 1991 K1500 Chevy Truck? http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/ Fri, 18 Dec 2009 10:20:15 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: bigchevynut72 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-812 bigchevynut72 Sun, 21 Jun 2009 11:59:12 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-812 Check the rubber bushings on your shocks, I had an 85 Blazer with a 454 and 4spd and every time I clucthed or mahed the gas while cruising under no load it clunked. Also Check the leaf springs, I had one of those break in an 84 Blazer with a 6.2 diesel and 4spd and it clunked almost the same as the shock grommet. The loose ring gear cradles sounds quite likely too as well as the pinion bearing. Jack the rear end up and support the frame so the springs stretch, look for cracked springs, worn or missing shock grommets, try to pull forward on the pinion yoke(it should have no thrust). The crush sleeve may not have been set propperly which would take out the pinion bearing as well as on and off the gas would pull the pinion in and out of the ring gear which could then in turn vibrate loose or stretch the carrier cradle bolts resulting in the scar inside the pumpkin cover. There are several possibilities but don't cheap-out on the repair, ring-pinion, bearings including both axle bearings along with carrier and pinion and seals. If there's metal filings the bearings are all nicked and scratched you would wind up replacing them soon after a half a** repair. Check the rubber bushings on your shocks, I had an 85 Blazer with a 454 and 4spd and every time I clucthed or mahed the gas while cruising under no load it clunked. Also Check the leaf springs, I had one of those break in an 84 Blazer with a 6.2 diesel and 4spd and it clunked almost the same as the shock grommet. The loose ring gear cradles sounds quite likely too as well as the pinion bearing. Jack the rear end up and support the frame so the springs stretch, look for cracked springs, worn or missing shock grommets, try to pull forward on the pinion yoke(it should have no thrust). The crush sleeve may not have been set propperly which would take out the pinion bearing as well as on and off the gas would pull the pinion in and out of the ring gear which could then in turn vibrate loose or stretch the carrier cradle bolts resulting in the scar inside the pumpkin cover. There are several possibilities but don’t cheap-out on the repair, ring-pinion, bearings including both axle bearings along with carrier and pinion and seals. If there’s metal filings the bearings are all nicked and scratched you would wind up replacing them soon after a half a** repair.

]]> By: cam s http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-811 cam s Fri, 19 Jun 2009 00:58:54 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-811 check your springs & shackles, they could be worn or need replacing check your springs & shackles, they could be worn or need replacing

]]> By: imadadinohio http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-810 imadadinohio Thu, 18 Jun 2009 07:29:24 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-810 not to sure on this one what i would recommend with out the high cost of a mechanic would be to jack it up on the pig throw some stands under it and get the tires for them to spin pull the cover back off and start it put it in gear have a friend or you give it gas and then hit the brakes as the other person is watching the rear gears you may actually see some thing shift in there not to sure on this one what i would recommend with out the high cost of a mechanic would be to jack it up on the pig throw some stands under it and get the tires for them to spin pull the cover back off and start it put it in gear have a friend or you give it gas and then hit the brakes as the other person is watching the rear gears you may actually see some thing shift in there

]]> By: vtx.1800retro http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-809 vtx.1800retro Mon, 15 Jun 2009 18:35:37 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-809 sounds like your pinion bearing is going out.. allowing your pinion gear to move inside the housing, won't be long untill the whole unit fails. Get that bearing replaced immediately, and do a total inspection on all parts inside that housing, the metal from a failed bearing can get between the gears or axel splines and cause havoc. I've had it happen, and i had to replaced the entire rear end. You might just get away with the ring and pinion and bearing and seals if you wre lucky. sounds like your pinion bearing is going out.. allowing your pinion gear to move inside the housing, won’t be long untill the whole unit fails. Get that bearing replaced immediately, and do a total inspection on all parts inside that housing, the metal from a failed bearing can get between the gears or axel splines and cause havoc. I’ve had it happen, and i had to replaced the entire rear end. You might just get away with the ring and pinion and bearing and seals if you wre lucky.

]]> By: done wrenching http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-808 done wrenching Sun, 14 Jun 2009 23:37:38 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-808 You need to coat the splines of the slip-joint of the rear driveshaft with the special lubricant that GM sells. Can't remember part # but it begins with 12345???. I used to use it for the SLIPJOINT clunk on my dodges. You remove rear shaft, clean oil off of splines and coat the splines with the lube. You need to coat the splines of the slip-joint of the rear driveshaft with the special lubricant that GM sells. Can’t remember part # but it begins with 12345???. I used to use it for the SLIPJOINT clunk on my dodges. You remove rear shaft, clean oil off of splines and coat the splines with the lube.

]]> By: It's Kippah, Kippah the dawg http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-807 It's Kippah, Kippah the dawg Sat, 13 Jun 2009 19:42:17 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-807 There shouldn't be any markings on the diff cover from any gears, nor should any of the gears have "gouges" or other non-wear like markings You might want to check for back-lash on the ring/pinion mesh, and ensure the ring gear is tightly seated. Also, take a look at your leaf springs to make sure one isn't broken in the middle of the pack. There shouldn’t be any markings on the diff cover from any gears, nor should any of the gears have “gouges” or other non-wear like markings

You might want to check for back-lash on the ring/pinion mesh, and ensure the ring gear is tightly seated.

Also, take a look at your leaf springs to make sure one isn’t broken in the middle of the pack.

]]> By: bigboy56073 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-806 bigboy56073 Wed, 10 Jun 2009 16:37:51 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-806 If there is a gash in the cover from the ring gear it has to be loose and moving arounf in there. Are the bearing caps tight. Does the ring gear move side to side. The bearings might be bad. Something is loose inside the rear diff. There should be no marks on the cover. If there is a gash in the cover from the ring gear it has to be loose and moving arounf in there. Are the bearing caps tight. Does the ring gear move side to side. The bearings might be bad. Something is loose inside the rear diff. There should be no marks on the cover.

]]> By: Jody D http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/comment-page-1/#comment-805 Jody D Sun, 07 Jun 2009 15:49:55 +0000 http://www.chevytruckshq.com/what-is-making-a-clunk-in-the-rear-end-of-my-1991-k1500-chevy-truck/#comment-805 Replace bearings or check the universal joint for excessive play. Replace bearings or check the universal joint for excessive play.

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