1. #1

    Diff cover gasket or RTV?

    I lost some oil out of my engine and the amc 20 today, so I'm going to change all my fluids in the Jeep. We won't discuss how... Anyways...

    Should I buy a new gasket for my diff covers, or can I just use RTV, or should I use both?

    Also, does it say anywhere what the gear ratio is on the carriers? Just thought I'll check it since it'll be open and all.

    And lastly, what oil viscosity should a T-5 use? My Haynes says to use some Jeep oil that's probably unavailable now or really expensive.

    Thanks!

  2. #2

    Re: Diff cover gasket or RTV?

    RTV.

    Check for a tag on either diff cover under a cover bolt, let us know what numbers are on it. If no tag, there will be a pair of numbers stamped in the side of the ring gear. Divide the larger number by the smaller for the gear ratio.

    I'm guessing 90w for the transmission but not for sure.

  3. #3

    Re: Diff cover gasket or RTV?

    OK. I did the front, but I'll put the oil in tomorrow so it can cure for a while. The rear cover is a bear to get off. I bought some crappy torx bits. You get what you pay for, I guess. Half are loose, the other six are still soaking in PB blaster.
    By the way, I have 2.73 for sure I was hoping for at least 3.08.

  4. #4

    Re: Diff cover gasket or RTV?

    RTV all day, everyday.

  5. #5
    Join Date
    Jan 2004
    Location
    Blacksburg/Williamsburg VA
    Posts
    2,573

    Re: Diff cover gasket or RTV?

    You don't really need to let the RTV "cure." Just make sure all surfaces are free of oil when applying it, let it sit for 15 minutes while you tidy up your tools and fill it up.
    06 VW (hardcore crawler)

    "The mountains are calling and I must go." -John Muir

  6. #6

    Re: Diff cover gasket or RTV?

    Quote Originally Posted by currupt4130 View Post
    You don't really need to let the RTV "cure." Just make sure all surfaces are free of oil when applying it, let it sit for 15 minutes while you tidy up your tools and fill it up.
    That's true. And one tube of RTV will lasts for many diff fluid changes.

  7. #7

    Re: Diff cover gasket or RTV?

    RTV on all my diffs... until recently, a friend snapped his axle on the trail, needed to pull the carrier to get the rest of the shaft out, he had a re-usable gasket, I am sold on them.. no cleaning, easy to use.
    It used to be a jeep Thing,
    But all that stuff broke

    -Johnny-


  8. #8
    Join Date
    Dec 2006
    Location
    San José, Costa Rica
    Posts
    1,693

    Re: Diff cover gasket or RTV?

    Yeah, I am similar in that sense; I have used RTV in all my diff oil changes, but I would get a reusable gasket for the next one simply because of ease of use and ease of trail changes. But RTV works just fine.

    '94 YJ 2.5L, Sperwinch EPi 9.0, RE 4" Std Lift, Adv. Ad. SYE, Woody Shafts, Alloy Axles, ARB Lockers, 4.88 gears, 62mm TB & Spacer, 165A Alternator, Griffin 3" Aluminum Rad, Taurus e-fan w/ DC Controller, Borla Cat-Back, Flowmaster hiflow cat, PD Ignition, 19# injectors, Adj. FPR (42PSI), MOPAR cam, Safari Snorkel, 33" BFG KM2, 15" AR wheels, Xenon H4 lights, KC Daylighters & Slimlites, Sony sound, Pavement Ends Targa Top, Hanson Front Bumper, JCR Offroad rear, AtoZ Rockers, Rhino lined Tub.

  9. #9

    Re: Diff cover gasket or RTV?

    Thanks. I finally got the rear done. I bought some nice 5/16 1/2 bolts to replace those stupid Torx bolts. I'm filling it up today.

  10. #10

    Re: Diff cover gasket or RTV?

    Lube locker reuseable gaskets, great if your always changing fluids

  11. #11

    Re: Diff cover gasket or RTV?

    I used RTV, and it hasn't leaked a drip so far. I'll keep using the RTV since it's $4 a tube and I don't change fluid often. Thanks for the advise, though.

  12. Re: Diff cover gasket or RTV?

    I use a lot of high quality polyurethane caulking at work. Had a partial tube of it when I built the new diffs. Baad idea. Went to change the fluid. I liked to never got that cover off with a hammer and a putty knife. It woulda been fine with no bolts till I drug it on a rock. Now I use the gasket and a small amount of aircraft sealant. Lesson learned.

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