I have a 1985 camaro Z28 and I need to put in a new pinon oil seal. I have never worker on this part of the car before. I have done a lot of work on the engine ( Just put in a new intake manifold had a lot of fun ) and have been vary successful do to the fact that I fallowed the directions in my Chilton. Now the guy I was going to have do it has a defferant way then the book and I need to know if the way he wont to go about it is right or if I should follow the book and do it myself. Ok 1 mark the driveshaft & pinion yoke ( take driveshaft off) mark pinion yoke, pinion shaft and nut. Put on new seal in then install washer and nut to the same position then tighting an extra 1/16in beyond the mark? But he told me not to go the extra 1/16in I should only go to the mark bcause it is old. To me that dose not make since but I could be wrong. So I am putting it up to you to pick Lady's way the extra 1/16in or the Gent's stay at the same old mark? Thanks, Lorihopland

 

My answer is .... buy yourself a torque wrench and follow chiltons specs.

What you are concrened about when tightening the pinion nut is the amount of preload on the aptly named "crush sleeve." When you tighten up the pinion nut to the appropriate torqe rating ... the "crush sleeve" enters first into elastic and then plastic deformation.

Elastic deformation is just as the name implies, elastic. The metal will return to it's original shape after you apply a load. Plastic deformation will not.

So, Let's assume the pinion does not stretch when loaded by the pinion nut. The crush sleeve has already been plastically deformed to the appropriate length after plastic deformation, but has returned elastically. So, if the crush sleeve is under the same conditions as it was when the mark was made, you should be fine.

In reality, either way would be alright I believe, but I would bet myself a torque wrench just to be certain.

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welcome to thirdgen.org. i'd say either would work, i've done it both ways with good results. if i had my choice i'd go the extra 1/16 or a little more past the match mark.

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I agree with the above, a little past where it was. Don't forget to grease the seal lip, silicone the splines and use red loctite on the threads.
Also be prepared to jack the car way up so you can get a long breaker bar on the pinion nut, it's tight.

 

A little more info...

https://www.thirdgen.org/messgboard/...ML/005713.html

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