I am pretty sure this is for a 65-70 Pontiac 10/12 but...
Casting number ED30153 (153 only on Ring side)
Other casting marks..."ARMA STEEL"
Ring stamped 41-15 GM 1 70CY (no pinion but 41-15 = 2.73)
12 7/16 Bolts (haven't check but I assume LH thread)
Spider gear (differential pinion whatever) pin .745" in diameter
Ring seems to be 8.875 in diameter...haven't removed this one but the 72 10/12 ring I have sits nicely on top of this one and looks very similar.
31 spline 1.3125 diameter bolt in axles (don't have them but no recess for C-clip in side gears)
Single spring posi unit (one on each side) pic below.
12 Bolt carrier ID.
- BigBlockMan
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Re: 12 Bolt carrier ID.
Yes it is the older style 65-70 it has the smaller pinion shaft (spider gear shaft) and the 2 spring preload system.
Jim I think I also have one of these 162 casting?? I will double check it. What is the ring gear flange height on this one? You say it was a 2.73 yes?
Hopefully we will compile what units from the late sixties to the early 70's are interchangeable. lol.
There are also casting numbers that are 17-1, 17-2, 17-3 (these are from the 70's) 4 spring system eaton units with 28 and 31 axle spline units
250, 248, 31 spline axle units
all are corporate 12 bolts with 10 bolt covers....
I will get a list to you on all the info I have as soon as it is in order. Jim
Jim I think I also have one of these 162 casting?? I will double check it. What is the ring gear flange height on this one? You say it was a 2.73 yes?
Hopefully we will compile what units from the late sixties to the early 70's are interchangeable. lol.
There are also casting numbers that are 17-1, 17-2, 17-3 (these are from the 70's) 4 spring system eaton units with 28 and 31 axle spline units
250, 248, 31 spline axle units
all are corporate 12 bolts with 10 bolt covers....
I will get a list to you on all the info I have as soon as it is in order. Jim
J D Race
- BigBlockMan
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- Posts: 11
- Joined: Wed Sep 23, 2009 11:18 pm
- Location: Montana
- Contact:
Re: 12 Bolt carrier ID.
The flange height was the same as the 72 10/12 I have at 1.980 from the end of the bearing hub...Looks to be identical to the 72 version as far as dimensions go...smaller spider shaft and larger/longer pin bolt.
Here is a bit of interesting info for ya..the guy O got this carrier from said he had it in a 8.5" case and got the gear pattern set coreectly...just couldn't get the axles he had to fit....ponder on that for a while.
Here is a bit of interesting info for ya..the guy O got this carrier from said he had it in a 8.5" case and got the gear pattern set coreectly...just couldn't get the axles he had to fit....ponder on that for a while.
Re: 12 Bolt carrier ID.
AH..... No way... It is too big a diameter of gear to fit the case. The pinion will probably fit as it has all the same dimensions as a 8.5 pinion.
You migth be able to fit the 8.5 unit into the 12 bolt / 10 bolt housing. BUT you will need the carrier with the a36 carrier bearing.
Just have to get things here back in order to start tinkering again...lol. Jim
You migth be able to fit the 8.5 unit into the 12 bolt / 10 bolt housing. BUT you will need the carrier with the a36 carrier bearing.
Just have to get things here back in order to start tinkering again...lol. Jim
J D Race