GM Longroof Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.



 
HomeHome  PortalPortal  GalleryGallery  Latest imagesLatest images  SearchSearch  RegisterRegister  Log in  

 

 What was that about differential gaskets with slits?

Go down 
+3
Cadet57
jayoldschool
BuickBarry
7 posters
AuthorMessage
BuickBarry




Posts : 12
Join date : 2013-10-07
Location : Ottawa, Ontario, Canada

What was that about differential gaskets with slits? Empty
PostSubject: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 1:11 am

The posi diff on my 96 is banging on slow tight curves, like backing out of a driveway. Added additive to no effect. Time to clean it out and replace the lube, BUT somewhere in a forum I saw mention that there are good gaskets (with slits) and bad gaskets (without slits). Now I can't find the post.

What's the score with the gaskets? I seem to remember that bad things happen to...inner wheel bearings? if the wrong gasket is used. Is there a GM part number that guarantees the correct slitted gasket? I've never seen one, so I don't know what to look for.

As well, any thoughts on the best lube and the best additive? Thanks for any illumination.
Back to top Go down
jayoldschool

jayoldschool


Posts : 2728
Join date : 2009-06-14

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 10:31 am

80w90, with GM posi additive.

This gasket from Fel-Pro:

What was that about differential gaskets with slits? MpfDeXB8gwDl9enhZOY3ZdA
Back to top Go down
Cadet57

Cadet57


Posts : 3047
Join date : 2010-04-13
Age : 37
Location : Chicopee, MA

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 10:35 am

jayoldschool wrote:
80w90, with GM posi additive.

This gasket from Fel-Pro:

What was that about differential gaskets with slits? MpfDeXB8gwDl9enhZOY3ZdA

Thats the gasket I have. I seem to recall there are little tabs on the diff cover, or housing that the gaskets mates to.
Back to top Go down
200OZ
Moderator
200OZ


Posts : 1745
Join date : 2009-08-06
Age : 50
Location : Farmington NY.

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 10:50 am

I'm not sure you can even buy the old style gaskets that cover the "ports" that feed the outer axle bearings, so that shouldn't be an issue any more.

I just use conventional rear gear fluid, with GM limited slip additive. I've not had the best luck with synthetics running clutch/friction type limited slips differentials.

Mike
Back to top Go down
BuickBarry




Posts : 12
Join date : 2013-10-07
Location : Ottawa, Ontario, Canada

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 2:54 pm

Thanks to everyone. Will let you know how it goes, if it goes.

Interestingly, someone told me it might be better to omit the gasket. They had leaks with the gasket but no leaks using just sealant. Decisions, decisions.
Back to top Go down
Cadet57

Cadet57


Posts : 3047
Join date : 2010-04-13
Age : 37
Location : Chicopee, MA

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 2:56 pm

BuickBarry wrote:
Thanks to everyone. Will let you know how it goes, if it goes.

Interestingly, someone told me it might be better to omit the gasket. They had leaks with the gasket but no leaks using just sealant. Decisions, decisions.

I'm running just a gasket and haven't had any leaks. They key is to make sure your diff cover and housing surfaces are clean and level.
Back to top Go down
Sprocket

Sprocket


Posts : 6141
Join date : 2008-11-04
Location : Palm Beach County

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 03, 2014 10:38 pm

yeah clean both the cover and the housing with a razor blade to make sure it's clean/

If you end up with a gasket without the holes you could make them easily with a hole punch.

Also, learned this trick some where.....lightly coat both sides of the gasket with wheel bearing grease. The paper will absorb it. Why that is good is that when you unbolt it again, it won't stick and you can reuse it with no leaks.
Back to top Go down
BuickBarry




Posts : 12
Join date : 2013-10-07
Location : Ottawa, Ontario, Canada

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSat Aug 16, 2014 11:00 pm

Yeah, so we drained it and ordered the correct GM gasket w/correct part number. When the gasket arrived, it had had no slits, so some of those wrong gaskets are still out there under the correct part number from your friendly GM parts counter, at least in Canada.

Got the correct Fel-Pro gasket, drained the diff, cleaned it twice, no visible wear or bad cogs, refilled w/ 3 liters of synthetic 75/90 and 2 hits of GM LS additive. Result: no difference. Still does nok-nok-nok on very tight turns, esp if the rear wheels are on different levels, as in backing out of a driveway. Is it the synthetic lube? No idea. At least there are no leaks. I quit. For now.
Back to top Go down
200OZ
Moderator
200OZ


Posts : 1745
Join date : 2009-08-06
Age : 50
Location : Farmington NY.

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 17, 2014 9:40 am

Drain the expensive synthetic, and refill with conventional oil and additive.
Back to top Go down
jayoldschool

jayoldschool


Posts : 2728
Join date : 2009-06-14

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeSun Aug 17, 2014 1:05 pm

Yeah, I feel bad. We should have said no synthetic.
Back to top Go down
200OZ
Moderator
200OZ


Posts : 1745
Join date : 2009-08-06
Age : 50
Location : Farmington NY.

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeMon Aug 18, 2014 3:56 pm

I kinda did.
Back to top Go down
phantom 309

phantom 309


Posts : 5848
Join date : 2008-12-28
Age : 114

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeTue Aug 19, 2014 2:07 pm

Interesting to see so much talk and time on something simple as a gasket,.which doesn't necessarily need to be used,.
10 secs work with an exacto knife on the gm gasket,.. and its all good,.

Me personally i use silicone to seal a diff cover,.but,..

do what you want , you're gonna anyway.

Back to top Go down
sherlock9c1




Posts : 2399
Join date : 2009-05-28
Location : Huntsville, AL

What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitimeTue Aug 19, 2014 7:42 pm

Those holes are not for lubrication anyway - they're for spreading the housing at the factory to make differential installation easier given that it needs some preload. If the differential tube bearings needed dedicated lube passages, it would have been a lot simpler just to grind a slit in the side of the carrier bearing area for oil to travel through.

As long as the fluid level is at the appropriate level, the tube bearings will get enough oil.

I believe the real problem was that the pinion yoke leaked and so the fluid level went down and as a result the tube bearings didn't get oiled and the axles got chewed up.


Thus, whether the gasket has holes or not is a secondary concern. Nick's point says it all - if you care that much, then cut two holes with a knife and git-r-done.
Back to top Go down
Sponsored content





What was that about differential gaskets with slits? Empty
PostSubject: Re: What was that about differential gaskets with slits?   What was that about differential gaskets with slits? Icon_minitime

Back to top Go down
 
What was that about differential gaskets with slits?
Back to top 
Page 1 of 1
 Similar topics
-
» Differential bearings
» TBI Head Gaskets?
» Header gaskets
» Changing Differential gears
»  Ring gear differential

Permissions in this forum:You cannot reply to topics in this forum
GM Longroof Forum :: Longroof Tech :: Wagon General Discussion-
Jump to: