Rear end problems? yikes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brently · 01-26-2004, 04:12 PM

I have a popping coming from the rear end - it is a posi rear end in my 72 swb - just bought the truck and it appears to be the one that came in it - it says this is what it is in the glove box lid - i haven't checked the gears - the popping only occurs when i turn - it is like the axle stops turning when i turn a curve - it pops loud and jumps - but again only when i turn - this confuses me - i know nothing about rear ends so can someone help please? Brent

67chevemall · 01-26-2004, 04:26 PM

Maybe low oil but sounds like a rebuild Gears are cracking together in the diffy gears!
??

stelth2002 · 01-26-2004, 04:28 PM

Posis can have that characteristic, but i would check it out for sure

*1972C10* · 01-26-2004, 09:32 PM

My 85 did that when the clutches went out it was locked into full time 2WD

**FRENCHBLUE72** · 01-26-2004, 09:47 PM

Sound's like the clutch's are going out....I had a 66 that did the same theing untill it was a 1 wheel peel..

bumpster · 01-26-2004, 10:35 PM

Check/change the fluid before you tear it down. If the fluid gets too old or wrong type put in, the clutches won,t release as they should. It would probably feel like you are running over a brick with whichever tire is on the inside of a hard slow turn. good luck

corn · 01-26-2004, 10:50 PM

Yea, change the gear oil first & make sure you use posi lube. GM also makes an additive for posi units that comes in a little bottle & I think its made of whale blubber if I remember right, quiets them right down...corn

01-26-2004, 04:12 PM	#1
Brently Registered User Join Date: Feb 2002 Location: Chattanooga Posts: 151	Rear end problems? yikes I have a popping coming from the rear end - it is a posi rear end in my 72 swb - just bought the truck and it appears to be the one that came in it - it says this is what it is in the glove box lid - i haven't checked the gears - the popping only occurs when i turn - it is like the axle stops turning when i turn a curve - it pops loud and jumps - but again only when i turn - this confuses me - i know nothing about rear ends so can someone help please? Brent

01-26-2004, 04:26 PM	#2
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Maybe low oil but sounds like a rebuild Gears are cracking together in the diffy gears! ?? __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

01-26-2004, 04:28 PM	#3
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	Posis can have that characteristic, but i would check it out for sure __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

01-26-2004, 09:47 PM	#5
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,600	Sound's like the clutch's are going out....I had a 66 that did the same theing untill it was a 1 wheel peel.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

01-26-2004, 10:35 PM	#6
bumpster Junior Member Join Date: Jan 2004 Location: Stillwater, Oklahoma Posts: 63	Check/change the fluid before you tear it down. If the fluid gets too old or wrong type put in, the clutches won,t release as they should. It would probably feel like you are running over a brick with whichever tire is on the inside of a hard slow turn. good luck __________________ 72 C10 10 yr.daily driver 68 C10 18 yr.money pit 72 Nova all original 99 H.D. Heritage[sanity check] 71 VW topless bug[summer fun] "When I have the money, I don't have the time ; when I have the time, I don't have the money.

01-26-2004, 09:32 PM	#4
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	My 85 did that when the clutches went out it was locked into full time 2WD

01-26-2004, 10:50 PM	#7
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Yea, change the gear oil first & make sure you use posi lube. GM also makes an additive for posi units that comes in a little bottle & I think its made of whale blubber if I remember right, quiets them right down...corn



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