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The HD brakes were standard for Blazer/Jimmys. All of them I have seen have had them, I think the Suburbans are the same way. bigblock73 can check his, but I am betting they are 1.25 also.
As for the last year, it was '87, the last year of the body style.
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Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com
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