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Old 07-20-2019, 11:42 PM   #15
Zombie killer
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Originally Posted by olblue75 View Post
I have 1LE axles and was running 3.91's on a stock diff and never had a problem, then I switched to a Z28 still running the same axles and did a track day in May with no issues. I have bought a set of Z28 axles and the lines to make the diff cooler functional that's the next project on the books after cam and head swap.
Are you running with a dropped suspension or factory ride height? That may be the difference. I may try a higher temp grease and see if that helps.
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Old 07-21-2019, 12:02 AM   #16
hammdo
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I am very curious to figure out this axle boot mystery myself. I am running 19” rims and when checked according to the measuring setup above, I am dead on 25.5”. However I started developing axle grease slinging out the drivers side after I installed a factory 1LE rear diff in my SS. So I installed new GM axles on both sides the day before NCM at CFest9. Guess what? One day on track and I can see evidence of fresh axle grease. So what gives ? I wonder now if I am generating heat thru the rear diff for some reason that gets the grease in the axle boot hotter some how. The drivers side is my only bad side, which of course has the less diameter half shaft to dissipate the heat. I guess I will be watching this issue more and try to figure it out. Might start checking temps with a infrared gun back there more often.

Anybody experience similiar issues that they have pinpointed the culprit ??
Just curious if you’ve ck the diff bushings for give?

I know when I ran NCM, it was hard on the drivers side suspension...

-Don
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Old 07-21-2019, 03:48 AM   #17
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Dropped

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Originally Posted by Zombie killer View Post
Are you running with a dropped suspension or factory ride height? That may be the difference. I may try a higher temp grease and see if that helps.
I'm running 1" dropped BMR springs.
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Old 07-22-2019, 11:31 PM   #18
Zombie killer
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Originally Posted by hammdo View Post
Just curious if you’ve ck the diff bushings for give?

I know when I ran NCM, it was hard on the drivers side suspension...

-Don
Brand new diff bushings last year when I swapped in the 1 LE diff. In fact it has the Delrin center bushing. I always do a good check over before any track day with a nut and bolt check but I didnt see anything wrong.
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