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12 bolt from hell

This is a discussion on 12 bolt from hell within the Drivetrain forums, part of the LSx Technical Help Section category; So after all the trouble I have just getting my Moser 12 bolt,found a new problem today.it has been in ...

  1. #1
    autoconnectionllc.com 02transamce's Avatar
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    12 bolt from hell

    So after all the trouble I have just getting my Moser 12 bolt,found a new problem today.it has been in the car for less than 2000 miles and it is leaking from around where the driveshaft meets the housing,not a huge leak,but a leak just the same.any suggestions on how to permanantly fix this?
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    I noticed a small weep on the pinion seal of our 12 bolt as well. Going to run it a bit and see what develops.

  3. #3
    Moderator Firebirdjones's Avatar
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    Sounds like it's coming from the pinion seal area. For the record I hate moser and don't deal with them anymore.

    If the seal is leaking on a new setup almost immediately I'll take a shot in the dark and bet that someone didn't put sealer on the threads of the yoke before installing it which would give you the impression the seal is leaking.
    I see it all the time on builds from other shops. I wouldn't expect such a rookie mistake from a shop like moser (even if they do suck ) But I've seen stranger things happen.

    To explain this a bit futher,,,,,,, This will simulate a pinion seal leak, but closer inspection will show the leak is actually coming out between the driveshaft and the yoke, right where the pinion nut is installed.
    When assembling the rear pinion gear for the last time it is necessary to install a sealer (of your choice) on the pinion spline/yoke spline before sliding it on. Otherwise oil will start to seep through those splines.

    I'm thinking that is the issue because quit frankly the pinion seal itself shouldn't have failed so quickly on a new build unless the pinion bearing itself is going south. That usually happens on a poor install when someone doesn't set the preload on the pinion bearings properly. And well,,,,if it gets that deep then the ring and pinion setup was done poorly to begin with and needs to be sent back to do over again.
    Last edited by Firebirdjones; 07-04-2010 at 08:29 AM.

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    Damn...

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    autoconnectionllc.com 02transamce's Avatar
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    Damn x2
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    autoconnectionllc.com 02transamce's Avatar
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    Thanks for the info,pinion seal was my first thought
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    Moderator Cutlass's Avatar
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    I think when it comes time for me to install a 12 bolt or 9" in my car, I'm gonna build it myself....

  8. #8
    autoconnectionllc.com 02transamce's Avatar
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    Wishing I took the ford rear axle training back in the day.if I tried to build my own the gears would whine at idle!
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    sick & twisted SS 02_slp_ss's Avatar
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    thats funny, but 9in are alot easier to set up imo then a 12 bolt, we have a 9in in are race car an i have put so many together i could probaly do it in my sleep lol

    Quote Originally Posted by 02transamce View Post
    Wishing I took the ford rear axle training back in the day.if I tried to build my own the gears would whine at idle!
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    We have run our car about 400 miles since I last posted in this thread. Put the car on the lift last week to change out the fluid in the differential and to look things over. No sign of oil at the pinion seal... must have been from assembly is all I can figure.

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    autoconnectionllc.com 02transamce's Avatar
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    Good,maybe mine will be the same way.
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    autoconnectionllc.com 02transamce's Avatar
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    Interesting development today,changed the oil,fuel filter,and per Performabuilt's instructions I changed the trans fluid and filter,found 1 pan bolt missing,and almost all other trans pan bolts very loose,only had to used my ratchet on 3 bolts!!! All the others were finger tight!!!iwas changing the oil first and remember thing "damn its moist under here for a new tranny and rear main seal" rekon my 12 bolt was not leaking after all.
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    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by Cutlass View Post
    I think when it comes time for me to install a 12 bolt or 9" in my car, I'm gonna build it myself....
    And then I can pay you to build mine I'm SRS!
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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by 02transamce View Post
    Interesting development today,changed the oil,fuel filter,and per Performabuilt's instructions I changed the trans fluid and filter,found 1 pan bolt missing,and almost all other trans pan bolts very loose,only had to used my ratchet on 3 bolts!!! All the others were finger tight!!!iwas changing the oil first and remember thing "damn its moist under here for a new tranny and rear main seal" rekon my 12 bolt was not leaking after all.
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    Yep, I've always had to go back and retighten the pan bolts after a few heat cycles. Seems the gasket shrinks a bit and/or the bolts work their way loose.

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    Same here... changed my fluid last year and after a couple of short drives I went back and re-torqued all my pan bolts. They had loosened quite a bit and I had a small weep at the front rail. Just how it is.

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    I don't sell out! blackSS01's Avatar
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    Junk ass automatic






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    autoconnectionllc.com 02transamce's Avatar
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    yeah,couldn't get a 6-speed ceta,wifecouldn't drive a stcik shift then anyway.she does want a six-speed zo6 now though!

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    Member bberretta's Avatar
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    Quote Originally Posted by 02transamce View Post
    Interesting development today,changed the oil,fuel filter,and per Performabuilt's instructions I changed the trans fluid and filter,found 1 pan bolt missing,and almost all other trans pan bolts very loose,only had to used my ratchet on 3 bolts!!! All the others were finger tight!!!iwas changing the oil first and remember thing "damn its moist under here for a new tranny and rear main seal" rekon my 12 bolt was not leaking after all.
    Posted via Mobile Device
    Trans bolts are notorious for loosening up like this especially after a gasket and fluid change. Use to see it all the time when I worked in a shop. Used to put a dab of silicone on the bolts as I was putting them in- not a whole lot, but just enough to act like a threadlocker but not enough to make a mess!

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    Member qwk93ta's Avatar
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    Quote Originally Posted by 02transamce View Post
    Interesting development today,changed the oil,fuel filter,and per Performabuilt's instructions I changed the trans fluid and filter,found 1 pan bolt missing,and almost all other trans pan bolts very loose,only had to used my ratchet on 3 bolts!!! All the others were finger tight!!!iwas changing the oil first and remember thing "damn its moist under here for a new tranny and rear main seal" rekon my 12 bolt was not leaking after all.
    Posted via Mobile Device

    I have a Performabuilt level II trans, it's been in my car since April. Within a day of bringing it home I found trans fluid on my garage floor.....Almost every bolt around the pan was loose.

  20. #20
    Member bberretta's Avatar
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    That's why whenever I do a pan gasket I use a little sealant on the bolts and afterwards I start the car, run it to temp and let it cool. Then tighten everything down again- the heating and cooling of the case makes the bolts back out.

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