SaM Becker: I have a 2003 Z71 silverado and have noticed the same noise. I bought the
truck a few months ago and have been living with the sound ever since. I
notice the clunking noise in between 1st and 2nd gear the most, when going
around 15 mph and speeding up. I'm going to change the u-joints to see if
this will help, any other ideas?
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?
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
oso loco: My 2012 silverado does the exact thing when I put it in drive or reverse
Ravis Maximus: as said below about spider gears take drive shaft off and check play in
diff spider gear and or ring and pinion prob loose
Nick Thompson: These trucks are known for having play in the spider gear
austen fritz: It's ur ujoint
ChevyBurton: U joint!
Erika Bennett: Rear end
Chris Henson: if its not broke dont fix it
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
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?
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?
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
jason guzman: I have the same problem can u told me what it is let off the breaks at a
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
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
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
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.
scott napier: I have a 2011 chevy silverado and the problem was the slip yoke
kody woodring: same thing happened to my 44 its bad pinion bearings and axel shims are
dust so everything isnt tight just replaced mine today works like a charm.
they were humming terribly
Chevrolet Silverado bad u-joint or slip yoke?4.3
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