Chevrolet Silverado Bad U-joint Or Slip Yoke?




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Al Smith: Can a bad rear differential, U-Joint, or drive shaft cause a delayed engagement problem in a 2002 Ford F-150 XL Super Cab? I put it in drive...about 5 seconds later my truck lunges forward, and when I slow down by breaking and re-engage the accelerator, there is about two seconds of a "neutral-like reaction" before the acceleration continues (so long as I do not stomp on the accelerator). It shifts fine once in gear though. If I am traveling at ANY rate of speed and then suddenly stomp the accelerator, there is this deep thud noise that feels like the rear end was just jerked!!! ((((as if something back there didn't get the message that the tranny and the motor were ready to go)))) Mechanic thinks it is my differential...what do you think?

oso loco: My 2012 silverado does the exact thing when I put it in drive or reverse

Ravis Maximus: also you have exhaust lifter clap these are known to break echaust bolts and or back out check I bet one is broken on the header manifold

austen fritz: It's ur ujoint

Chris Henson: if its not broke dont fix it 

Nick Thompson: These trucks are known for having play in the spider gear

ChevyBurton: U joint!

Erika Bennett: Rear end

G4M3K1LL: I have the same problem EXCEPT, now I have no reverse and minimal forward power. The trans is stuck in limp mode (3rd gear). But what you have is what I started out with (plus limp mode). Chevy Silverado 2500HD 6.6 LT. Will post video in April when I'm back home

daugela: @trayyy00cvrurface I drive like a granny. Absolutely no hard wear on the truck. All U-joints replaced. Still clunks. New slip yoke. Still clunks. Either it's IN the trans or like you said the diff....

Veikra: thats definetely the rear end, needs shimming the pinion. Bad care or lots of km/miles

daugela: @CSXPapp Diff

TXguy: I don't know if you're still monitoring this site, but the speedo problem might be the speedo gear and rear end ratio don't match.

daugela: @CSXPapp - Diff End. Never figured out the prob. Spiders?

Chris' tian: I have a 1990 Chevy Silverado(C1500), everything seems fine and runs great but when I come to a complete stop and then accelerate at a moderate level it makes this clunk but doesn't do this if I come to a rolling stop and accelerate again. Any idea what this could be? I've heard its something to do with the slip yoke and this is perfectly normal is that true. Transmission fluid is at a good level and is a nice red color. There are no issues at any other speed shifting into another gear.

beaglemanzzz: Does it clunk when you let off the breaks at a red light?

tss212: probably most from g80 locker. They have alot of slop nothing bad

Rick Straube: I threw a new driveshaft/u-joints/yoke on my truck (2002 Sierra Denali 6.0) and now it makes an odd thunk intermittently. Buddy of mine said it's drivetrain slop. Sounds like a bass drum under the truck. Seems to coincide with uneven pavement. Also when driving slow in reverse. Any ideas??

Texassince1836: my '86 C10 does this...but i know my trans and rear end are bad...

daugela: @anonuhmys 120K. Other than this issue, it runs like a champ. Always been my onw wrench, but never dealt with spider gears before....Should I expect shavings in there or obvious wear?

Bob Cobb: 2001 suburban here. Have the drivetrain slop/clunk to. When accelerating from stop, especially when turning I hear it. When accelerating at low speeds(5-30mph) I hear it and of course when shifting out of park, R or into D. While diagnosing this issue my shifter broke leaving me stuck in R. Had to block the rear wheels as I was on a hill and replace that entire cable(2 piece system) with the new design. I have yet to fix the clunk. Replaced U-joints. Next is yoke I hope it isn't more serious.

daugela: @anonuhmys - no clue what the problem is...

Alex TehGreat: likely an exhaust bolt broken off, common on these trucks

daugela: UPDATE: I replaced the slip yoke and it made a WORLD of difference with the clunking sound going from park to drive and from driving away from a complete stop. But the reverse still clunks as it does in the video. The gears in the diff as indicated by some posters were correct. There was shavings and it appears I could use a rebuild. I suspect that was the problem but TOO expensive to fix. Will deal with it until she dies.....

GMguy/KDW49: ive been threw 3 rear ends. its the spiders everytime and sometimes more.

mike3000ace1: I have the same thing going on, Did you find a fix yet?

daugela: It's the differential. I was told it would be expensive - like more than $500 bucks. So I'm just living with it...

Jutt08: Yeah, it clunks then lurches back. Then if i put it into park and put it into reverse again its less noticeable. IDK man, its making my 09' feel like a old beater.

TheGMlover1: That's a bad slip yoke that's the tranny spinning inside of the yoke and the clank going into gear is the u joints and they make a lot of extra slack in there that shouldn't be there

xalbertoherrerax: Now when u try and drive or go reverse does it make a noise like a POP sound while on the move, mine does this plus the infamous thump

James Dunlap: I am experiencing exactly what you described, especially the shifting clunk. If this back lash is normal do I need to do anything about it or just live with the clunk?

daugela: You're right on the money. Need to try the downshift though.... I don't think so but everything else, yes!

daugela: yup. as you drive away...

TheCarlitosReef: My 95 Chevy Astro has the same problem when first shifting from P to R does a loud thump and shakes the whole van. The guy who has been working on it mentioned to change the U joins that it may be they are still stock. Meaning they are dry and have no grease. Also when I first drop my transmission pan there was a lot of shaving particles in there and the fluid was CRAZY dirty so I changed the fluid. I am not sure if is worth spending on the U joints to see if it would help.

TXguy: The dealer knows exactly what it is. I bought a 2009 Silverado that developed that problem shortly after I drove it off the lot. It felt like driveline binding in 4WD, but I don't have 4WD. The dealer said dirt gets into the slip yoke and causes it to bind. Easy fix is to grease it, but it doesn't last. They replaced it under warranty and it's smooth as silk--for another few years.

daugela: @demetro1988 A u-joint is not a spider. A spider is located inside your differential. In this case, the U-joint was replaced and the problem stayed.

jason guzman: I have the same problem can u told me what it is let off the breaks at a red light?

Thomas Garrett: Check your oil! lol!

trayyy00cvrurface: im pretty sure thats the blacklash on your diff man.bad driving habits?

1911Fan85: freak it, do a neutral drop at 5000 rpms it'll fix it for sure!!

Justin Brown: I put heavy duty u joints from the local parts store in mine and it stoped doing I did front and rear of the drive shaft cleared that noise right up this is considering the transmission shop told me I need a new t case

Bob Cobb: lol I also hear that chevy piston slap a little bit after you started it up. That tick-tick-tick-ticking that one can really begin to hear at :45. No real fix for that either except a new crate engine of full overhaul. I'm living with the piston slap until all my lift and body mods are done then a new 5.3 300HP+ GM crate for less than the price of a overhaul at around 3k.

daugela: Never figured out. I think it's just worn gears....Even the Chevy dealership trans tech doesn't know. Suspects old worn gears...nothing more.

jet62095: Could also be the driveshaft support bearing , mine did that and busted the dsb in two pieces...

omarpit187: thanks , will do

ohwowonly: yea i have a 2000 sierra and my buddy has a 2001, they both do the same thing. Its not the u joints. and its not bad for the truck.. its fine. just leave it and stop freaking out over it. i did for a while till a several of my frineds that are professional mechanics looked and said it was fine

daugela: @ omarpit187 - Clunks are obviously difficult to diagnose online but in your case, I would take it to a shop and have them check your transmission solenoid. My did the same and. When the solenoid was replaced, it fixed the problem.

Tungsten23: is it bad if my 09 Chevy Silverado 1500 Crew Cab 5.3L V8 does this? like its a really hard clunk then lurch.

cruz826014: I think I have the same problem on my 08 silverado everytime I let of the brakes the rear clunks.

angst206: Mr. Gear Head, Thank you for the info. "Double walled"? that prolly explains my problem. My drive shaft pings, using tire rotation as a base, I count about 9-11 pings. makes sense at 3.73s, I have jacked it up securely with 4 6tons stands and I and brother crawled under and the sound is coming from the middle of shaft, smooth at trans output and axle input; replaced spider gears in Feb. busted inner wall? thnks. cheers then.
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Chevrolet Silverado bad u-joint or slip yoke? 4.3 out of 5

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Chevrolet Silverado bad u-joint or slip yoke?