[chaz2112]

i just finished up installing an eaton "stock" posi rear end that i bought used. it had 60 some thousand miles on it. question is how long should that clutch pack in there be expected to last under normal operating conditions ?? my problem is that i have a lot of noise, popping, grinding when cornering. should i expect that it needs rebuilt or could it be that i should change grease and additive and try running it again. when i jack up one wheel at a time and turn them, they feel good and noise is not there. that is spinning them by hand though.
unit is a 8.5 with 3.73 ratio. came out of a 1973 nova. seller was no help as he bought the car to part out.
any advise would be appreciated.

 

[David_D.]

Not sure if this is the issue, but did you add the posi additive to the gear oil when you filled the rear?

 

[undercvrSS]

you mention you jack one wheel up at a time, and you can turn them? If one wheel is on the ground, and you can turn the other, then it's either worn out, or it's not a posi. With one wheel stopped, you should'nt be able to turn the other wheel.

unless I misunderstood what you said.

 

[chaz2112]

posi prob

i did not say they turn freely but you can turn them. i have a ford pick up with a posi and i was comparing the two. both units are about the same comparitivly.
With both wheels up, they turn the same direction. About the grease. I cant remember if i put the additive in with this first batch of grease or not. i know i did not buy the expensive grease as i knew i was going to dump it right away and install the good stuff. (first a flush) just cant remember if i bought the additive or not. if those clutch packs are not suspect with this many miles i think i should try it again with the additive and good grease. anyone???

 

[undercvrSS]

try some new oil with the additive first. A good posi should take a ton of effort to turn the wheels individually.

Posi's wear out, and that could be part of the problem.

 

[chaz2112]

posi prob

put in new quality grease with bottle of additive and on a short test drive i had no noise. hopefully that did the trick.