Here is the final info that I have found.
Original Part=GM #3773856 1 1/4" Brake Bore 1 1/8" Clutch Bore
I could not cross this to anything but that is the casting number.
Raybestos MC19089 1 1/4" Brake Bore 1 1/4" Clutch Bore
Raybestos MC34404 1 1/8" Brake Bore 1 1/8" Clutch Bore
Centric 130.80018 1 1/4" Brake Bore 1 1/8" Clutch Bore
This would have been off an early 60's C80 or 2 tonish truck.
The Centric part is the correct one but... Centric option is 150$ as well as any other option with 1 1/4" dual bores if you wanted to make the case to step up the clutch bore. These are also not a readily available.
I think the wise experienced Sno-Drifter has already learned a few things for us and is passing it along subtle. The Raybestos MC34404 which has dual 1 1/8" bores is a readily available part and costs under 50$ or 1/3 of the Centric option. Quite possibly the reduction of brake bore size is an improvement due to allowing for a longer pedal throw and could reduce the sticking issue?
That sounds like the way to go. How about the fluid? Brake fluid or other option like ATF?
Original Part=GM #3773856 1 1/4" Brake Bore 1 1/8" Clutch Bore
I could not cross this to anything but that is the casting number.
Raybestos MC19089 1 1/4" Brake Bore 1 1/4" Clutch Bore
Raybestos MC34404 1 1/8" Brake Bore 1 1/8" Clutch Bore
Centric 130.80018 1 1/4" Brake Bore 1 1/8" Clutch Bore
This would have been off an early 60's C80 or 2 tonish truck.
The Centric part is the correct one but... Centric option is 150$ as well as any other option with 1 1/4" dual bores if you wanted to make the case to step up the clutch bore. These are also not a readily available.
I think the wise experienced Sno-Drifter has already learned a few things for us and is passing it along subtle. The Raybestos MC34404 which has dual 1 1/8" bores is a readily available part and costs under 50$ or 1/3 of the Centric option. Quite possibly the reduction of brake bore size is an improvement due to allowing for a longer pedal throw and could reduce the sticking issue?
That sounds like the way to go. How about the fluid? Brake fluid or other option like ATF?