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Started By
Message
OB mechanic online diagnosis competition-Driveline Squeal
Posted on 5/11/13 at 12:58 pm
Posted on 5/11/13 at 12:58 pm
For those who don't know, 1994 k1500 z71 with a NP241 Tcase and an auburn locker in the back.
With the back tires off the ground and the transmission in neutral, spinning the back tires produces a dragging/squealing noise. Will only do it when turning the wheels forward. No noise when backwards. No excessive effort required to turn it either direction.
When driving, it sounds like it has bad u-joints, but it doesn't sound right to be u-joints from underneath, it sounds like it's coming from the transfer case.
I'll answer any other questions. I don't know what exactly is wrong with it yet but I'll know by the end of next week probably for sure when my mechanic buddy looks at it.
What is your best guess of the culprit?
With the back tires off the ground and the transmission in neutral, spinning the back tires produces a dragging/squealing noise. Will only do it when turning the wheels forward. No noise when backwards. No excessive effort required to turn it either direction.
When driving, it sounds like it has bad u-joints, but it doesn't sound right to be u-joints from underneath, it sounds like it's coming from the transfer case.
I'll answer any other questions. I don't know what exactly is wrong with it yet but I'll know by the end of next week probably for sure when my mechanic buddy looks at it.
What is your best guess of the culprit?
2
Posted on 5/11/13 at 1:16 pm to DownshiftAndFloorIt
I would drop the drive shaft out its not that much trouble and then you can isolate it if its in the rear end or the transfer case.
Posted on 5/11/13 at 1:28 pm to Cracker
Could possibly be wear on the gear teeth in the rear end. The wear would be evident turning the wheels forward as that's the majority of use. Reverse is used very little, so the teeth wouldn't grind in that direction.
Posted on 5/11/13 at 1:30 pm to Cracker
Back u joint is stuck in the pinion yoke. Nothing is ever easy on this truck 
Posted on 5/11/13 at 1:32 pm to DownshiftAndFloorIt
Good fricking luck with that.
Posted on 5/11/13 at 1:32 pm to BayouBrawl
My 05 Z71 Tahoe had what sounds like a similar problem. Dragging sound, which I thought was coming from the TCase. It ended up being the carrier bearing in the rear end, and it was just resonating up the driveshaft.
Posted on 5/11/13 at 1:41 pm to Polar Pop
This is a one piece driveshaft with no carrier bearing.
Bout to slap some new u joints in it.
Bout to slap some new u joints in it.
Posted on 5/11/13 at 2:03 pm to DownshiftAndFloorIt
Long bed or short bed? If long, I'd have a close look at the carrier bearing. Is it on jack stands while you are testing? I mean is it safe to crawl under? If so have your wife, S.O. or friend spin the wheel and get up under it with a cheap auto stethoscope and pin point it.
If all else fails, remove the locker and send it to me.
If all else fails, remove the locker and send it to me.
Posted on 5/11/13 at 2:09 pm to Themole
quote:
If all else fails, remove the locker and send it to me.
Hell no. Other than the winch that's probably the most valuable thing on this dinosaur.
It's a short bed. There is no carrier bearing.
If LSU would hurry up and win this game, I'm going to press the front joint and stick the slip yoke back in the transfer case and spin it to see if there's still some noise. If the t-case is fried, an NP 205 may be in order
Posted on 5/11/13 at 2:24 pm to DownshiftAndFloorIt
I have a 97 Tacoma 2.7 4x4 with a 147K on it. Can't wear it out. I stay on top of the PM and don't put it in mud holes unless I have to.
Sweetest little truck I ever had was 68 C10 two wheel drive with a locker. It would pull our Nth Fl swamp roads (if I were careful)anywhere I needed to take it.
Sweetest little truck I ever had was 68 C10 two wheel drive with a locker. It would pull our Nth Fl swamp roads (if I were careful)anywhere I needed to take it.
Posted on 5/11/13 at 2:27 pm to Themole
quote:
don't put it in mud holes unless I have to
Same here, but I "have" to do it pretty frequently.
Hopefully these u joints I bought are worth a damn. I couldn't find dana ones anywhere around the house so I got some precision greasable ones.
Posted on 5/11/13 at 2:41 pm to DownshiftAndFloorIt
I have a feeling it may be the teeth on your pinion gears. These are also sometimes referred to as "spider gears." You probably already know what these are, but if not, they're the gold gears in this pic.
I would do as others suggested and try to disconnect the drive shaft before you spin the wheels again. This will help you figure out exactly where the origination of the sound is.
I would do as others suggested and try to disconnect the drive shaft before you spin the wheels again. This will help you figure out exactly where the origination of the sound is.
Posted on 5/11/13 at 3:15 pm to bapple
I'm going with pinion bearings. can you move the DS back and forth at all?
Posted on 5/11/13 at 3:36 pm to bapple
It's not the pinion gear. It's either the front u joint or in the t case
Posted on 5/11/13 at 8:22 pm to DownshiftAndFloorIt
Yeah,that auburn locker don't have spider gears does it?
Posted on 5/11/13 at 8:54 pm to meauxjeaux2
quote:
that auburn locker don't have spider gears does it
Hell idk.
Turning the driveshaft with it disconnected from the pinion yoke produces the same noise. It's nothing behind the front u joint.
The old u joints were not in pristine shape to put it mildly. I'll find out tomorrow what kinda shape it's in and take some pictures of the old ones. It's pretty cool.
Posted on 5/11/13 at 9:11 pm to DownshiftAndFloorIt
Carrier bearing was my first thought. Not talking about a carrier bearing that supports a two-piece driveshaft. There are bearings on both sides, inside your rearend, on your carrier, that are called carrier bearings. The "carrier bearing" that supports the driveshaft, is actually called a center support bearing.
Posted on 5/11/13 at 9:15 pm to jsb29
He already said there's no noise with drive shaft disconnected coming from the rearend. I'd bet its a ujoint. Had the same issues with my Tacoma and it drove me crazy. Ujoints visually looked good. Removed the shaft and you could feel the bad ujoint once removed.
Posted on 5/11/13 at 9:18 pm to meauxjeaux2
If the u joints weren't the problem I'll be VERY surprised. They were spicer solid joints, so they're the good shite but with somewhere around 140k lifted miles on them. I'll post pictures of them tomorrow.
One of the caps had nothing but metal shavings in it and the centers were all groved to hell.
One of the caps had nothing but metal shavings in it and the centers were all groved to hell.
Posted on 5/11/13 at 9:39 pm to meauxjeaux2
Didn't catch that part, so that most likely takes out that option, though, wouldn't it be possible that the extra tension of the driveshaft being bolted up, and putting more resistance on the pinion, cause pressure on inside parts? (Serious question, you're smarter at this than I.)
I know U-joints can do some funny stuff but the noise only spinning forward, and not backwards, has me stumped. That would seem more like an internal wear issue.
I know U-joints can do some funny stuff but the noise only spinning forward, and not backwards, has me stumped. That would seem more like an internal wear issue.
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