Blown posi 8.2 ?

Discussion in 'Got gears?' started by jmos4, Aug 13, 2016.

  1. jmos4

    jmos4 Well-Known Member

    Hi all,

    I have a 65 Gran Sport rear end the car came down with a growling noise and car within 20 miles would not move feeling like it was slipping. I thought it was the clutch and changed it all even though nothing looked broken also checked the trans fluid and was as expected.

    Went and checked the car in the air, went into all the gears, rear tires moved, after I got it on the ground same dam growling, sounding like the rear end, pulled the cover and lots of almost sand like grit in the bottom, yet all the gears look normal.

    The drivers axle bearing did move on the shaft, not sure if that happened removing it or maybe it slipped out, no wear is on the splines thinking maybe it pulled out of the spider gears. If that did occure would it burn up the cones/clutches?

    Regards,
     
  2. BrianTrick

    BrianTrick Brian Trick

    When you say the driver's axle bearing moved in the shaft,do you mean the inner diameter of the bearing is rotating on the shaft,and no longer had a press fit? If so,this is an indication that the shaft itself has shrunk in that area,which will require finding a replacement shaft.Either a nice used one,or aftermarket.This is a fairly common problem with the earlier shafts,as they were made with softer material.If you do need another shaft,and you are looking at used ones,have the bearing removed.That is the only way to determine if it is good.If it is even a hair undersized,don't bother with it.
     
  3. jmos4

    jmos4 Well-Known Member

    Hi,

    Yes the drivers side bearing and retainer both moved at min the thickness of the bearing.

    Today I put a old extra axle in it got the car on the ground and it moves but guessing that the posi clutchs are fried based on the grit in the gear lube.

    Does someone still make rebuild kits for the posi itself?

    Or is it junk and need to find another one?

    Regards,
     
  4. BrianTrick

    BrianTrick Brian Trick

    The cone style posi units,found in the BOP 10-bolts,can be disassembled and remachined,to tighten things up,but if there are broken pieces,you might be out of luck.
    If it is a clutch style,there are clutches available for some of the different style of clutch posi units.
    Do you have a picture of the unit?
     
  5. SubCool

    SubCool SubCooled

    Eaton makes a clutch style posi carrier for the 64-67 BOP 8.2 rear. much better design and rebuildable if needed down the road
     
  6. christy staunto

    christy staunto Well-Known Member

    Talk to Monzaz here on the board, he is a real good guy on Buick axle,s.
     
  7. jmos4

    jmos4 Well-Known Member

    Hi again,

    Yeah its a factory cone type thought there were some kind of clutch or friction disk in there with all the grit but must be case/cone material.

    May look into a new carrier (Auburn) as at present running a spacer on a 2 series unit (3:55), or put another used one I have in it.

    I will have to contact him when I get it apart to see if it is repairable or not.

    Regards,
     
  8. BrianTrick

    BrianTrick Brian Trick

    If it is a 2-series,now is the time to put the correct carrier in. I don't think I would invest more into the 2-series. What is the other carrier that you have?
     
  9. jmos4

    jmos4 Well-Known Member

    Hi,

    Its also a 2 series, all depends on if I want to spend the money on a new one(Auburn ) as not sure if its worth buying a used 3 series and for what they seem to go for.

    Regards,
     
  10. BrianTrick

    BrianTrick Brian Trick

    I guess it depends on how much you like to take your car apart. I guess you could put that other unit in there and get what what use you can out of it. I just wouldn't bother spending money on either of your existing units,when you could invest that money into a new unit,that is also the correct series.
     
  11. SubCool

    SubCool SubCooled

    I would be very leery of buying a new Auburn carrier, they suffer from the same weakness as a factory carrier. the Eaton is the longest lasting and only rebuildable option out there.. even Monza recommends against trying to rebuild a cone style carrier
     
  12. wkillgs

    wkillgs Gold Level Contributor

  13. jmos4

    jmos4 Well-Known Member

    Hi,

    Yeah I figured I'd be replacing all the bearings again. I don't have any complaints about the cone design, it only burned up from the one axle coming out, think I made it 20 miles before it wouldn't go any farther, as I thought it was the clutch at first.

    I've read a lot of back and forths regarding Auburn vs Eaton posi's. Not exactly sold on either design fully, wish they made a true trac for the 8.2. Will see...

    Regards,
     
  14. monzaz

    monzaz Jim

    Really can not go wrong with NEW posi units.... they are warrantied and will work great. Auburn or Eaton... Auburn does have the 3 / mid series advantage to hold 2.93 3.08 and 3.23 ratios... And the BOP 64-72 all came with Auburn units... regular and heavy duty 4 spider gear type.
    NOW if you have a 2 series gear and want to keep it YOU do not have a choice...THERE ARE NO 2 series NEW carriers out there. SO you can send what is left of the 2 series cone unit and as long as you have good spiders and cross shaft springs etc. I can refurbish it and it will work good again. I have done 3 for ONE guy in Missouri or OK area and he beats the heck out of the refurbish stuff I have done NO issues. I did tell him they will not last forever BUT have fun. :)

    Jim
    JD
     

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