slickfx3

mine is quiet, but i topped off the rear end and my left stub shaft seem to have stopped leaking,( is that even possible) and i read the LSD additive defeats the limited slips purpose.

can/should i live with chatter? is it harmful? i don't have chatter now.

MelWff

you would notice it when you go through a turn at a slow speed that the rear would chatter. The additive prevents this from happening but the rear will still lock when more power is applied. Why are you asking if you can live with something you dont have?

slickfx3

bc the rear was low in fluid( around a pint?) and by re-filling it, i could have diluted the posi additive( since i did not add any more posi juice), possibly causing a chatter in the future

out of laziness, if it does chatter I could just ignore it...that is why i ask before it could or could not happen.

i know this is stupid

1974CorvetteJimCr

No it's not stupid, it's logical thinking. This happen to my Vette and what I did.

On March 25, 2016 Drove the Diamondback (NC, Hwy 226A). Actually we went down the Diamondback, we went up NC, Hwy 226. In 6.8 miles we went up over 2,000 feet, and over 50 turns to Little Switzerland, NC. The average grade was 4% to a maximum of almost 20%!

Needles to say this put a lot of stress on the differential and the spring preloaded clutch type positraction.

I began to hear hammering around the corners, I suspected the clutch plates in the differential were chattering. And when turning at a stop light it was very evident.

I looked for GTR1999's post on the Corvette Forum.

It became very clear from all the post I read that I needed to change the gear oil in the differential. The type of gear oil recommended from GTR1999 was Lucas Heavy Duty High Performance 85W-140 Gear Oil (not synthetic) and two bottles of GM (AC Delco) Limited Slip Axle Lubricant Additive.

Did 20 figure-8's, 5-cirles to the left, 5-cirles to the right, then a drive of 10 miles at 55mph on NC, Hwy-221. This took care of the problem!!!

tracdogg2

1980-1982 are a completely different design than the 65-79 clutches. They won't chatter. You also won't have any increased stub axle end play when they wear.
Mike

slickfx3

so no need for limited slip juice?

tracdogg2

Yes, you still need 1 bottle to reduce wear on the discs.

1974CorvetteJimCr

Actually two bottles of the ACDelco additive is required. GM has been tinkering with the chemical makup over the years.

7T1vette

I doubt that's been in the last 20 years..... They barely give a cr@p for the cars they just sold.

tracdogg2

Only one bottle is needed.

1974CorvetteJimCr

I actually spoke with GTR1999 [Gary] his recommendation is Lucas Heavy Duty High Performance 85W-140 Gear Oil (not synthetic) and TWO bottles of GM (AC Delco) Limited Slip Axle Lubricant Additive.

Gary's recommendations are SPOT ON! My differential is working perfectly.

Gary's credentials are impeccable, a member since 1999, total post 10,512. He also has been rebuilding differentials for over 30 years. I'll take his recommendation over anyone's when it comes to differentials, gear oil and additives.

I am not misleading anyone here, I'm providing good advice, with real world results.

DUB

DUB

tracdogg2

Ok, good point. Here's mine.
I do this for a living, not part time.
I own my my machines, bought and paid for.
I have been doing this professionally for over 40 years. I have built thousands of differentials.
I built racing differentials, not just street cars.
I design and build my own bearing caps.
I am the only person machining the bearing cap pads to the carrier centerline.
I bore housings for clearance, not hog them out with a grinder using the drop and gouge method.
Here's the icing on the cake. Gary does not build Dana 44 differentials. You have an Eaton differential. Slickfx3 has a Dana 44.

Go check your Lucas fluid and tell me it has not turned to water.

Mike

'75

1974CorvetteJimCr

OK, I get it

It would had been nice if you had posted those credentials before I made an *** out of myself.

Curious, why would say the Lucas fluid is going to fail?

CA-Legal-Vette

Don't feel like an ***. It takes a while to figure out who are the real experts on this forum. Gary and Mike certainly deserve this designation. As with most people knowledgable in their field of expertise, their recommendations will evolve over time and this detail may well fit in this category.

I'll never forget the post where a member said he wouldn't let Lars near his car because Lars' belt buckle would scratch his paint.

I LOL'd at this one

DUB

Just waiting.....

DUB

tracdogg2

No problem, you did fine. You gave an honest opinion on a subject without knowing there was a difference in designs. No foul, no harm done.
Gary does excellent work. So do I. I go several steps further, repairing factory machining flaws, issues that are at the very root of a proper rebuild. I don't write novels. If Gary wants to that's fine. He's pretty good at it too.
I have differentials coming in and going out of my shops every day. I have seen firsthand what Lucas oil does in a differential. Gary likes it. Tom recommends it. I will never use it.
Mike

Dub, what are you waiting for? That popcorn has got to be getting pretty stale by now. LOL.
Mike

DUB

I am waiting to here a response(s) from someone (like you) who deals in this EVERY DAY. And has seen the effects of some lubricants....which I HAVE NOT...so I am BEING SMART....BECAUSE....outside of the LUCAS 85w-140 oil...I also have the Richmond oil with the same viscosity....and if Jim is going to have a problem in the future...even though his problem STOPPED when he changed the oil from the GM oil I put in his differential....I am just 'waiting'...because I also respect Gary's opinions also...

DUB

tracdogg2

That's why I always respect your opinion Dub. And your knowledge.
Mike