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**Bob B.** · 01-11-2006, 02:42 PM

I believe on 1967-70, the 1/2 tons had a 1 inch bore master cylinder, and the 3/4 tons had a 1 1/8th. bore. They look the same from the outside.

01-11-2006, 02:42 PM	#5
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,396	Re: booster upgrade, MC compatability? I believe on 1967-70, the 1/2 tons had a 1 inch bore master cylinder, and the 3/4 tons had a 1 1/8th. bore. They look the same from the outside. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.