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Old 10-01-2020, 08:00 AM
TTOP350 TTOP350 is offline
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Location: IL
Posts: 385
Default 70 12bolt bearings

Picked up a 70 12bolt and was wondering if anyone has all the bearing/race and seal numbers. I've tried to search around and only found the kits.

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  #2  
Old 10-01-2020, 09:41 AM
'ol Pinion head 'ol Pinion head is offline
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Front Pinion bearing M88048, race: M88010
Rear Pinion bearing (big one): M802048, race: M802011

Carrier bearing (2): LM603049, races: LM603012
C-clip axle bearings (2)... 5707
axle seals (2)...National 8660S

Pinion Seal:
I use Ratech 6109 pinion seal on 12bolts & occasionally order Ratech's side shims & solid pinion spacers. Locally avail National 8460N pinion seal can be used, but upon installation, you MUST make sure not to fully bottom out the pinion seal, instead, leave a little less than an 1/8" all the way around the flange of the seal & the nose of the housing, if not, the pinion seal will be too deep & the pinion seal area will leak.

I've never used master installation kits with a bunch of thin carrier shims. Typically, for carrier installation, I use a proper thickness factory cast spacer on LH side (have a huge selection) & a GM service spacer & thin shim (or two) on passenger side of the carrier bearing race. Part number for the GM service spacers for 12 bolt car & truck carrier was discontinued (bought 40 of them years ago before disco'ed). Same diameter service spacer now has a GM part# under the 8.6 10 bolt truck application but cost is over 5 times the price of what I bought previous part under. Just another big Thank You to Gubbermint Motors & another reason my extended family doesnt support GM with vehicle purchases.

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Last edited by 'ol Pinion head; 10-01-2020 at 09:51 AM.
  #3  
Old 10-01-2020, 03:58 PM
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Formulabruce Formulabruce is offline
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Have made a spacer ring for the pinion seal. The one currently offered Is not for a car, its for a late 80's truck 12 bolt.

  #4  
Old 10-02-2020, 03:13 PM
TTOP350 TTOP350 is offline
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Thank you very much for the info. Wanted to have new bearings ready for when I tear it down and clean up the housing.

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