8.5 10 bolt suggestions

Discussion in 'Got gears?' started by Buickcub, Jan 12, 2021 at 5:52 PM.

  1. Buickcub

    Buickcub Well-Known Member

    Everyone, what are you using for new bearings and seals in this unit? I was looking on the JD RAce forum and saw where he was having trouble with bad bearings

    http://forum.jdrace.com/viewtopic.php?f=16&t=562

    I personally do the 12 bolt chevy rear even with c-clips we would use disc brakes in the back and that will be a c-clip elim effect so really c-clip rear will not be any issues with disc brakes.
    PLUS c-clip axles just seal really well and do not cause leak issues like the bolt in axles do.
    WE have had BIG trouble with the 8.5 rears not sealing good at the axle shafts. NEW or Used axles
    The bearings are garbage in the market for that axle system these days.

    Were taking the rest of the bolt in axle 8.5 rears and chopping the ends off and installing c-clip ends to solve this leak issue. tired of the calls...
     
  2. BrianTrick

    BrianTrick Brian Trick

    I am still finding some National seals that are the correct width. Most of these companies are converting to one seal,to simplify production,and are making a width in between the two. There is also a variance of how deep the axle tube was bored. If it’s on the deeper side,you will need a wider seal,or a shim that is placed into the tube before installing the axle. What I do is mic the depth of the bore,withnyhe backing plate. Then mic the overall width of the bearing and seal together. If the bore depth is greater,use a shim. Otherwise once everything is installed the cone will unseat from the race,and the weight of the car pushes down on the housing,the shaft pulls up on the seal,creating a gap on the bottom side of the seal,which then lets oil leak out.
     
    techg8 and knucklebusted like this.
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Brian,
    What is the most correct seal thickness? Is it .490". There have been numerous threads over the last decade I think of incorrect seals. .375" is the incorrect seal width if I remember correctly. This leads to excess end play problems/leaks. You build rears. We need some clarity on this. What is the average measurement of bore depth, and how does that correlate to needed seal thickness for the 2146/712146 seals?
     
  4. BrianTrick

    BrianTrick Brian Trick

    The 2146 is the thinner and incorrect one.
    The 712146 was .490,but they seem to be coming out at .460”.
     
  5. Buickcub

    Buickcub Well-Known Member

    Is .490 the desired thickness?
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    So you would use a .030" shim. Where would you get that, and what are the other dimensions?

    Yes
     
  7. Buickcub

    Buickcub Well-Known Member

    Just to clarify is the .490 the overall thickness or just to the flange (does that include the flange. A friend of mine has some on the shelf, .470 to the flange, .490 including I could probably make some shims if needed
     
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    It's the physical width of the seal.

    http://forum.jdrace.com/viewtopic.php?t=414
     
    Last edited: Jan 14, 2021 at 1:08 PM
  9. Buickcub

    Buickcub Well-Known Member

    ok sounds like a friend of mine (Teddy) may have the correct one!
     

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