8-3/4 rear pinion seal question

[Syleng1]

8-3/4 center chuck- 741 case
Is there a difference in the pinion seals between a 489, 741 and 742 case?

I noticed mine is leaking. And I do not remember what kinda car the center chuck came out of for reference.
Thanks!
Syleng1

 

[thesiren74]

https://www.google.com/url?sa=t&sou...sQFnoECBQQAQ&usg=AOvVaw2nHlLWpe5kOdQNOOMMvcZC

 

[Syleng1]

Got my answer. Thank you!

 

[niceolddart]

Got my answer. Thank you!

Curious to find out what the cause of the pinion seal leak was. I installed a new seal on a friends 8 3/4" rear & it leaks too. (I did install it properly also)

 

[thesiren74]

Curious to find out what the cause of the pinion seal leak was. I installed a new seal on a friends 8 3/4" rear & it leaks too. (I did install it properly also)

Same thing on my dad's car, I'm wondering if it's leaking from the seal or the outer pressed in shell.

 

[oldkimmer]

The vent and/or the hose can be plugged with dirt or other crap. Kim

 

[72Duster440]

The yoke surface could have a groove worn in it too, allowing it to not seal properly. Or your pinion bearings could be shot.

 

[TrailBeast]

Curious to find out what the cause of the pinion seal leak was. I installed a new seal on a friends 8 3/4" rear & it leaks too. (I did install it properly also)

I always either put a little RTV on the yoke splines or under the flat washer to help keep oil from seeping out through the splines.
(just in case that’s the problem)

 

[Syleng1]

My issue is a 50 year old center chuck and a heavy foot.

 

[4spdragtop]

 

[thesiren74]

My issue is a 50 year old center chuck and a heavy foot.

Yep