71-72 1/2t vs 3/4t power booster setups - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**oldgold70c10** · 11-14-2009, 07:55 PM

What can y'all tell me about the differences in the booster setups 1/2 vs 3/4 ton? What parts are common between the two?

Basically, what I want to know is could I use a 3/4 ton master cylinder with the 1/2 ton booster and bell crank/bracket that bolts to the firewall?

Thanks!

JimKshortstep4x4 · 11-15-2009, 12:15 AM

I believe that there is a problem between the booster and master cylinder if you try to use a 3/4 ton MC with a 1/2 ton booster. At least all of the ones that I have seen will not interchange.

The mounts to the firewall are the same.

Jim

**oldgold70c10** · 11-15-2009, 11:56 AM

Quote:

Originally Posted by JimKshortstep4x4

I believe that there is a problem between the booster and master cylinder if you try to use a 3/4 ton MC with a 1/2 ton booster. At least all of the ones that I have seen will not interchange.

The mounts to the firewall are the same.

Jim

Thanks, that's exactly what I needeed to know!

screamin_c10 · 11-15-2009, 11:04 PM

Quote:

Originally Posted by JimKshortstep4x4

I believe that there is a problem between the booster and master cylinder if you try to use a 3/4 ton MC with a 1/2 ton booster. At least all of the ones that I have seen will not interchange.

The mounts to the firewall are the same.

Jim

What is the difference? I ask because I have a 1/2 ton disk front end I will be swapping under my 68 C20 and thought the power brake 1/2 ton M/C was a bolt on to the C20 booster....Is it a piston to plunger thing, the bolt pattern etc?
Any further info would be helpful...sorry for the hijack

11-14-2009, 07:55 PM	#1
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	71-72 1/2t vs 3/4t power booster setups What can y'all tell me about the differences in the booster setups 1/2 vs 3/4 ton? What parts are common between the two? Basically, what I want to know is could I use a 3/4 ton master cylinder with the 1/2 ton booster and bell crank/bracket that bolts to the firewall? Thanks! __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

11-15-2009, 12:15 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: 71-72 1/2t vs 3/4t power booster setups I believe that there is a problem between the booster and master cylinder if you try to use a 3/4 ton MC with a 1/2 ton booster. At least all of the ones that I have seen will not interchange. The mounts to the firewall are the same. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

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