Quote:
Originally Posted by Chuck78
Has anyone else noticed that parts stores (or at least RockAuto.com) list both 1" & 1-1/16" hydraulic clutch slave cylinders for our old GMC's?
Luckily I was wise in the past decade and went on a few buying sprees of anticipated spare parts, & bought both size slaves, which I now need - to replace an 11-12 year old unit that is leaking like a seive currently. But the question is... Which one is the proper size, and if they both do fit our trucks, which trucks get which bore size??? Is one size to give more leverage for a much stiffer/bigger clutch&pressure plate?
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This is only for information only and it is my point of view.
The 1-1/16" bore will provide more force to the clutch but require more pedal travel to move the clutch the same distance as the 1" bore did. And it will take less foot pressure on the pedal. If the old unit is a 1" and you didn't go all the way to the floor to release the clutch then the 1-1/16" should work, providing all external and cup dimensions are the same.
Using the same size that came off of the truck it would drive and feel the same.
After working the math base on the master cylinder size of 1-1/8".
If it took 100 lbs of foot pressure to disengage the clutch with 1" slave cylinder.
Then it will take 88.6 lbs of foot pressure to disengage the clutch with 1-1/16" slave cylinder, this require pushing the pedal a little farther.
If my math is correct and the slave cylinder dimensions are the same I would use the 1-1/16" slave cylinder.