2 different 10x1 3/4, 8 3/4 backing plates?
Those are 331 shoes introduced in '69. You might want to knock the pin out to be sure it doesn't interfere.
1968 used FMSI frame number 288; 1967 and earlier used 256, although the Ford 151 is very close.
Do the slight differences in the holes make a difference? Chrysler says yes. The aftermarket says no. I say everyone can make their own choices.
I've used 151 (from a local relining thats now out of business) with the earlier system and was satisfied.
More certain is the lining materials can make difference in some situations - and that's even more difficult to get info on. But all lining manufactures will provide the edge code friction rating. So thats at least a clue.
These are 288 shoes.
This information is all available in the Master Technician Conference booklets, and also the shop manuals, etc.
Between Imperialclub, mymopar, and Hamtramck historical on-line websites we now have incredible access to original material that were formerly at dealerships.
Shoes
256 through Feb 1967
288 Starting March 1 1967. Hardware is the same as before. Only difference is the 288 shoe had tabbed contact points (as seen above).
331 Starting with the 1969 Model Year. Must be used with new automatic adjuster system.
Adjuster Systems.
Through 1968 Model Year auto-adjusters push down on the star wheel.
Starting 1969 Model Year, auto-adjusters push up on star wheels. Star-wheel Adjusters expand in opposite direction from earlier system.
Its another case of one size will fit close enough that most buyers won't know.
Those are 331 shoes introduced in '69. You might want to knock the pin out to be sure it doesn't interfere.
1968 used FMSI frame number 288; 1967 and earlier used 256, although the Ford 151 is very close.
Do the slight differences in the holes make a difference? Chrysler says yes. The aftermarket says no. I say everyone can make their own choices.
I've used 151 (from a local relining thats now out of business) with the earlier system and was satisfied.
More certain is the lining materials can make difference in some situations - and that's even more difficult to get info on. But all lining manufactures will provide the edge code friction rating. So thats at least a clue.
These are 288 shoes.
1969.
This information is all available in the Master Technician Conference booklets, and also the shop manuals, etc.
Between Imperialclub, mymopar, and Hamtramck historical on-line websites we now have incredible access to original material that were formerly at dealerships.
Shoes
256 through Feb 1967
288 Starting March 1 1967. Hardware is the same as before. Only difference is the 288 shoe had tabbed contact points (as seen above).
331 Starting with the 1969 Model Year. Must be used with new automatic adjuster system.
Adjuster Systems.
Through 1968 Model Year auto-adjusters push down on the star wheel.
Starting 1969 Model Year, auto-adjusters push up on star wheels. Star-wheel Adjusters expand in opposite direction from earlier system.
