Rear End.. possible problem...
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Rear End.. possible problem...
I took my 68' to work today.. and when making sharp right turns - I can feel some bump from the rear end (like driving over a small bump)... just as if the positraction fluid is old... However - I have changed the fluid 1.5 years ago... Is it possible that the fluid got bad again within that short time (and a few drag strip passes)... or have I f'd the rear end when Drag Racing??? I will check the fluid condition this weekend.. I hope that it's only the fluid...
Olivier
[Modified by GrandSportC3, 2:23 PM 12/27/2002]
Olivier
[Modified by GrandSportC3, 2:23 PM 12/27/2002]
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
Re: Rear End.. possible problem... (GrandSportC3)
Hi Oliver, I'll take a guess and at least make a recomendation for the first step.
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (PROSOUTH)
Hi Oliver, I'll take a guess and at least make a recomendation for the first step.
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
I hope that you are right... It's just strange that I replaced the fluid 1.5 years ago....
:cheers:
Olivier
Safety Car
Joined: Mar 2001
Posts: 3,725
Likes: 0
From: Rochester NY
Re: Rear End.. possible problem... (GrandSportC3)
Hi Oliver, I'll take a guess and at least make a recomendation for the first step.
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
Thanks,
I hope that you are right... It's just strange that I replaced the fluid 1.5 years ago....
:cheers:
Olivier
It sounds like the Posi Clutch Pack is Chattering, this usually results from worn Differential Lube or Clutch plates being Worn. I would have the rear lube changed and make sure to put in the GM Posi Additive to it.
From the GM Manual; To refill add 4 oz of GM #1052358 additive then fill to level with GM #1052271 or 72 to level full.
The other symptom is Differential Side Gear or Pinion. Which if this is the case will be most pronounced on a turn or side movement.
I would go for the new fluid and additive first and this is most likely what is wrong. Good Luck with this, JIM
Thanks,
I hope that you are right... It's just strange that I replaced the fluid 1.5 years ago....
:cheers:
Olivier
Joe
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (Xracer)
Not when you drag race. That is why I got out of the game. To many broken parts.
Joe
Joe
:cheers:
Olivier
[Modified by GrandSportC3, 3:53 PM 12/27/2002]
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
Re: Rear End.. possible problem... ('79ProwlerOrange)
Since you just had everything apart, I'd take a look to be sure everything is still tight and hasn't worked itself loose ;) .
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Aug 2000
Posts: 6,362
Likes: 7
From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Re: Rear End.. possible problem... (GrandSportC3)
You may just want to try working the lube back into the clutches by turning tight 360's (5 each direction) to make the differential work, just like you would if you changed the gear oil. Good luck.
Racer
Joined: May 2002
Posts: 352
Likes: 0
From: GA
Re: Rear End.. possible problem... (GrandSportC3)
GrandSportC3,
Sounds like you broke a spidergear. If it only makes the noise when you make sharp turns. If so you should not drive it because the broken parts can ruin the ring and pinion. You can crack the the rearend cover and drain the fluid out, if there's pieces of metal in the fluid that's probably what happened.
Sounds like you broke a spidergear. If it only makes the noise when you make sharp turns. If so you should not drive it because the broken parts can ruin the ring and pinion. You can crack the the rearend cover and drain the fluid out, if there's pieces of metal in the fluid that's probably what happened.
Drifting
Joined: Nov 2001
Posts: 1,502
Likes: 0
From: Elyria Ohio
Re: Rear End.. possible problem... (GrandSportC3)
Oliver If it comes down to it. I have a 3.55 rearend sitting on the floor on my garage (in a box used). I don't think I will be putting it in the 76 like I wanted. I think the Telecom Hammer is about to fall at work. SO I might be making some hard decisions soon.
321-427-9624
321-427-9624
Drifting
Joined: Feb 2002
Posts: 1,987
Likes: 3
From: Manchester, Dead Center in the Middle of TN 25 miles to Jack Daniels,10 miles to Geo Dickle, and .8 mile from the Liquor Store at I-24 Exit 114
St. Jude Donor '05
Re: Rear End.. possible problem... (Glenn454)
Oliver you have had a lot of good advice offered here. I was going out the door when I responded to your post. I tried to give you the best overall quick view I could.
I thought if you changed the fluid and something fell out you'd figure out real quick it was the latter. It's hard to diagnose without hearing the specific clunk, clank or clatter you have. Try the first thing and if that doesn't cure the ailment, Better call Bob and borrow that 355:1 from him.
One more thing it could be is a broken snap ring on the stub axel,not expensive to fix but a pain just the same.
Good Luck Again, JIM
I thought if you changed the fluid and something fell out you'd figure out real quick it was the latter. It's hard to diagnose without hearing the specific clunk, clank or clatter you have. Try the first thing and if that doesn't cure the ailment, Better call Bob and borrow that 355:1 from him.
One more thing it could be is a broken snap ring on the stub axel,not expensive to fix but a pain just the same.
Good Luck Again, JIM
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... ('79ProwlerOrange)
Arent you supposed to change the fluid and gear lube once a year?
:cheers:
Olivier
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (SmokedTires)
Since you just had everything apart, I'd take a look to be sure everything is still tight and hasn't worked itself loose ;) .
Thanks
Olivier
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (burners)
You may just want to try working the lube back into the clutches by turning tight 360's (5 each direction) to make the differential work, just like you would if you changed the gear oil. Good luck.
Olivier
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (Glenn454)
GrandSportC3,
Sounds like you broke a spidergear. If it only makes the noise when you make sharp turns. If so you should not drive it because the broken parts can ruin the ring and pinion. You can crack the the rearend cover and drain the fluid out, if there's pieces of metal in the fluid that's probably what happened.
Sounds like you broke a spidergear. If it only makes the noise when you make sharp turns. If so you should not drive it because the broken parts can ruin the ring and pinion. You can crack the the rearend cover and drain the fluid out, if there's pieces of metal in the fluid that's probably what happened.
:cheers:
Olivier
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (76 Red)
Oliver If it comes down to it. I have a 3.55 rearend sitting on the floor on my garage (in a box used). I don't think I will be putting it in the 76 like I wanted. I think the Telecom Hammer is about to fall at work. SO I might be making some hard decisions soon.
321-427-9624
321-427-9624
Right now - I have to know what's wrong with mine first... If it's bad - I might get yours or having mine rebuilt with stronger than stock parts... I drag race a lot and need stronger than stock parts...
:cheers:
Olivier
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Re: Rear End.. possible problem... (PROSOUTH)
Oliver you have had a lot of good advice offered here. I was going out the door when I responded to your post. I tried to give you the best overall quick view I could.
I thought if you changed the fluid and something fell out you'd figure out real quick it was the latter. It's hard to diagnose without hearing the specific clunk, clank or clatter you have. Try the first thing and if that doesn't cure the ailment, Better call Bob and borrow that 355:1 from him.
One more thing it could be is a broken snap ring on the stub axel,not expensive to fix but a pain just the same.
Good Luck Again, JIM
I thought if you changed the fluid and something fell out you'd figure out real quick it was the latter. It's hard to diagnose without hearing the specific clunk, clank or clatter you have. Try the first thing and if that doesn't cure the ailment, Better call Bob and borrow that 355:1 from him.
One more thing it could be is a broken snap ring on the stub axel,not expensive to fix but a pain just the same.
Good Luck Again, JIM
:cheers:
Olivier
