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**RPOZ11** · 02-10-2018, 08:13 PM

OK...
So I'm looking for a replacement 1972 issue GM 13" rear brake drum.
Part # 48716 is present in the 1972 drum; actually shows ---> 48716 4.
Here, in the pic below , is a comparison between the 1972 drum on the right and the 14-Bolt 13" drum on the left.
Both use the same shoe width.
The 14-Bolt drum is thicker where the hub is installed; maybe by approx 1/8".
The backing plates are identical except for where the pin goes thru.

We are going to try to install the 14-Bolt drum with the 1972 hub installed and see if it can be used.
The original 1972 backing plate is currently installed for this trial install.

02-10-2018, 08:13 PM	#22
RPOZ11 72 BB C30 Super LongHorn Join Date: Nov 2002 Location: Chavez Ravine Posts: 1,606	Re: 1972 c/30 bb longhorn OK... So I'm looking for a replacement 1972 issue GM 13" rear brake drum. Part # 48716 is present in the 1972 drum; actually shows ---> 48716 4. Here, in the pic below , is a comparison between the 1972 drum on the right and the 14-Bolt 13" drum on the left. Both use the same shoe width. The 14-Bolt drum is thicker where the hub is installed; maybe by approx 1/8". The backing plates are identical except for where the pin goes thru. We are going to try to install the 14-Bolt drum with the 1972 hub installed and see if it can be used. The original 1972 backing plate is currently installed for this trial install. Attached Images __________________ 72 BB C/30 Longhorn Super HO72 No-Spin, #'s matching, Tilt, Tach, AC, AM/FM HO72 build : http://67-72chevytrucks.com/vboard/s...d.php?t=714492 2017 SS Last edited by RPOZ11; 02-10-2018 at 08:19 PM.