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post #1 of (permalink) Old 06-01-2004, 08:16 AM Thread Starter
 
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Gonna change diff covers..... tips?

Gettin' around to changing out the front and rear diff covers for some stainless ones. Any tips to make this go relatively smoothly?

1) Gettin' the fill plugs out? (probably never been off)
2) Cleaning 'inside' the pumpkin?
3) Cleaning outside rim for new seal?
4) Fillin' her back up? I've heard fill till it comes out the fill hole. True? What kinda oil?

20 rear 35 front by the way...

Anything else? Thanks!! [img]images/graemlins/40BEER.gif[/img]
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post #2 of (permalink) Old 06-01-2004, 08:53 AM
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Re: Gonna change diff covers..... tips?

They never made a 35 front, its probably a 30.
Should be gear oil in both diffs unless you have some kind of limited slip that requires an additive.
You should clean the mating surface for the new gasket (or RTV). I like to use a wire wheel on a drill.
You shouldn't really need to clean the inside unless it is contaminated.
Are you swapping the stainless in for looks, or to upgrade the stock covers. It's your Jeep and you know what is best for it, but be careful of cheap, pretty, stainless covers. They are usually very thin and prone to damage off road. If you don't take it off road, then bling away!! [img]images/graemlins/grin.gif[/img]
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post #3 of (permalink) Old 06-01-2004, 09:45 AM
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Re: Gonna change diff covers..... tips?

1) don't worry about the fill plugs...The way to drain the diff is to put a large pan under it and start pulling the cover bolts off. You will likely get them all off before you see any oil...I usually have to pry my covers off. I leave a top bolt in, but loose, just to hold the cover up in the air, and let the diff drain into the pan of a while.

2) I swab out the diff with a rag as best I can. But I don't make too much of a deal of it. If your diff fluid is really dirty or green or milky, you can get fancy and pull the axle shafts and spray some brake cleaner in from either side...cleaning the tubes out, then spray down the housing and the carrier real good, swab it out then let all the brake cleaner dry out.

3) I always use RTV sealant instead of the paper gasket, so I have to scrape mine down with a razor blade, I use a widow scraper. Then I spray some brake fluid on a rag and wipe down the mating surface of the diff. Let it dry. Then run a bead of sealant around the edge (making sure to go to the inside edge at the bolt holes). Then apply the cover using an upper bolt as a guide. I then let it sit overnight to let the sealant cure.

4) If your diffs are still sitting level (not pointing at the t-case, using a CV drive shaft) Fill to the hole in the cover. Make sure your new bling covers have the hole in the same place as your original stock cover. I use Amsoil 75w90 in my D30 and F8.8. Dino 90w will do just fine.
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post #4 of (permalink) Old 06-01-2004, 10:28 AM Thread Starter
 
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Re: Gonna change diff covers..... tips?

Thanks for the replys...yeah yeah, bling bling blah blah [img]images/graemlins/grin.gif[/img]

Wasn't worried about the fill hole for 'draining', but for filling up the 20. It doesn't have a fill hole in the cover.
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post #5 of (permalink) Old 06-01-2004, 11:09 AM
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Re: Gonna change diff covers..... tips?

</font><blockquote><font class="small">In reply to:</font><hr />
It doesn't have a fill hole in the cover.

[/ QUOTE ]

The 8.8 doesn't either...has one on the case facing the t-case.
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post #6 of (permalink) Old 06-01-2004, 09:43 PM
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Re: Gonna change diff covers..... tips?

</font><blockquote><font class="small">In reply to:</font><hr />
They never made a 35 front

[/ QUOTE ]

Yeah they did. Used them in the TTB Ford Ranger. [img]images/graemlins/thud.gif[/img]
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post #7 of (permalink) Old 06-01-2004, 10:31 PM
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Re: Gonna change diff covers..... tips?

Oh geeze..... take the stupid covers off and let it drain. You would be ahead of the game by having new cover gaskets to put back on but as suggested some gasket sealer would do it. I'm an Ultra Black fan (held a 89 Olds 2.8 together.... well that's another story). And yes if it's nasty a can or two of brake parts cleaner would clean it out some.

Yes Yes Yes Yes fill it till it runs out of the fill hole, and with GL5. There are lots of better things but if you have never drained and refilled your diff's.... it's a cheap date and won't let you down. Also the recommended lube in your owner's manual. Best I can remember the AMC 20/Dana 30 combo will take around a gallon of GL5 if that's what you are working on here.

Oh yeah you are only looking to change the covers to Stainless..... hmm well they won't rust.... but what's inside is much more important.

Good Luck,
Dale

Edit:

What axles are we talking about here? Not that it will change my reply any.

[img]images/graemlins/confused.gif[/img]
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post #8 of (permalink) Old 06-02-2004, 07:05 AM Thread Starter
 
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Re: Gonna change diff covers..... tips?

I just love the replys that DO answer ya, but also kinda slap ya in the face.

[img]images/graemlins/AR15firing.gif[/img]

geeez [img]images/graemlins/puke.gif[/img]
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post #9 of (permalink) Old 06-02-2004, 07:25 AM
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Re: Gonna change diff covers..... tips?

I meant they never used one in a Jeep. If someone went through all of the trouble to swap in a TTB into his Cj-7, he has bigger problems than pretty diff covers. [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img]
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post #10 of (permalink) Old 06-02-2004, 07:43 AM
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Re: Gonna change diff covers..... tips?

</font><blockquote><font class="small">In reply to:</font><hr />
2) Cleaning 'inside' the pumpkin?

[/ QUOTE ]1. This is an often overlooked procedure.
2. It's also an important one.
3. If you clean it out,
4. You can do a visual check.
6. That check can reveal wear/chips/etc.
7. Here's how I do it:<ul type="square">[*]Spray the internals with WalMart Carb cleaner,[*]Do the visual inspection.[*]Move everything[*]Check for slop.[*]Check for excessive play.[*]Check for binds.[*]Follow up by a complete spray down,[*]Using diesel fuel in a garden sprayer.[*]The liberally coat the internals with the appropriate lube.[*]Recheck for binds.[/list]
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