I have a clunking sound when shifting to reverse from forward it comes from rear end but appears to be at axle ends not 100% sure of that though. It had it not as loud at 125,000 miles when I bought truck. Now at 196,000 miles is getting very loud is there an adjustment between pinion and ring gears that can be made easy without expensive tools. The fluid has been changed and old fluid was in good condition without any metal noted. The truck runs great just sounds like play somewhere in back end.
PMEDIC9
It could be the backlash between the ring and pinion is too big. Or it could be the all to common slip yolk "clunk" which can't really be fixed permanently
To check you can pull the drive shaft off the yolk and then move the yolk and see how much it moves before it hits the ring gear. Just WATCH OUT because once you remove the shafts you won't be in park anymore. So set the brake and block the wheels.
It's all feel. There is a measurement but I don't know it by heart.
As far as adjusting it goes, I'm used to full floating axles but I think the 10 bolt uses a crush sleeve to set pinion preload along with shims. So you would need to remove that and either add or remove shims depending on what side there on. Then put a new crush sleeve and tighten and re check.
But I've never done one before so that part may be wrong.
It's all feel. There is a measurement but I don't know it by heart.
As far as adjusting it goes, I'm used to full floating axles but I think the 10 bolt uses a crush sleeve to set pinion preload along with shims. So you would need to remove that and either add or remove shims depending on what side there on. Then put a new crush sleeve and tighten and re check.
But I've never done one before so that part may be wrong.
I have this “clunk” as well. However the clunk seems to be much softer or non existent when I have weight in the bed. I have asked others in regards to this because I have the Denali and it’s really quite annoying. Everyone has said it has something to do with the leaf springs. There is a gap when no load is on between the main two leaves and the last helper. Find a way to keep that gap closed permanently and you should be much better off. Put a clamp on in front of the axle. (Much like a track bar) I’m gonna be using a leaf spring clamp but first I need to realign my springs.
A 'clunk'? Heck, most of these older trucks have a clunking of some sort. Mine ('03 with 130k miles) has a slight one, even though most parts are new or like new.
First thing is to check the most obvious causes, such as u-joints and slip yoke.
If you're gonna get into the rear diff, you need some tools and some knowledge. Replacing or rebuilding a diff is not that hard, but it is definitely tricky and needs some careful measuring and assembly.
First thing is to check the most obvious causes, such as u-joints and slip yoke.
If you're gonna get into the rear diff, you need some tools and some knowledge. Replacing or rebuilding a diff is not that hard, but it is definitely tricky and needs some careful measuring and assembly.
Mine does this too push the brake to the floor and try it I mean really stand on it. I would check play in u joint and driveshaft, motor mount, trans mount. There should also be a grease fitting on the driveshaft always worth a try to give it fresh grease. Most likely its the same clunk we all have. My trucks had it since 85k has 131k now...99 gmc sierra 5.3 2wd ext cab. I wouldn't worry about it.
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