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my 77 gmc


Robin Hood

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Joined
Aug 18, 2007
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292
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Vehicle Year
2003
Make / Model
Ford
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3.0L V6
Transmission
Automatic
i am trying to find out which master cylinder i have because i need to replace it.

Its a 77 GMC K25 4x4 w/ the 203 transfer case. it has a locking diff...

the choices for brakes are either 13 inch brakes or 11-5/32 in...

Does that mean for the backplate or the drum face itself?
 


Danger06Ranger

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Lowell, IN
Vehicle Year
2006/1986/2001
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Ford/Mercury
Engine Size
4.0L/351M/2.5L
Transmission
Automatic
its the inner diameter of the drum
 

Robin Hood

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Vehicle Year
2003
Make / Model
Ford
Engine Size
3.0L V6
Transmission
Automatic
oh.

well the only difference is the bore size, so i'm just gunna take it out and measure the bore.
 

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