12 Bolt carrier ID.
Posted: Thu Nov 12, 2009 7:55 pm
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.
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.