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04-29-2002, 02:03 PM
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#1 |
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Registered User
Join Date: Apr 2002
Location: Houston
Posts: 28
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Brake identification
I just called the parts store checking on coil springs for my 68. My front-end parts are from a 85 and they asked me if I have a "J3" or a "J5 brake system. I dont have a clue! Do any of yall know what they are asking about???
------------------ 68GMC SWB Gound-up restoration, 350/700R4/??? 2002 3/4 HD for a daily driver. Can't get away from the GMs
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68GMC SWB Gound-up restoration,350/700R4/????.... 2002 3/4 HD for a daily driver. Can't get away from the GMs |
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04-29-2002, 02:36 PM
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#2 |
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Account Suspended
Join Date: May 2000
Location: IL
Posts: 0
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they always ask that, its RPO code i thnk oyu mean JB3 or JB5
I iwll see if I can find info online regarding this, I am curious to know also. been needing to find out, |
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04-29-2002, 06:52 PM
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#3 |
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Registered User
Join Date: Apr 2000
Location: Leesburg, GA
Posts: 746
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It should not matter what brakes you have. Basically all 2WD 1/2 and 3/4 ton front springs from the mid 60's to early 90's will interchange. The only difference is spring rate. My guess is one of those brake codes is for heavy duty brakes which may have come with HD front springs. Ask the parts guys if they show the spring rate for the two brake systems and pick the lighter if you want a smoother ride.
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FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed |
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04-30-2002, 07:51 AM
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#4 |
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Registered User
Join Date: Apr 2000
Location: Leesburg, GA
Posts: 746
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FYI. Looked on Hollanders: JB3 is power disc brakes with 11.86X1.04" rotors and 11X2" drum brake shoes(used 76-96). JB5 is power disc brakes with 11.86X1.29" rotors and 11.15X2.75" drum brake shoes(used 76-98).
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FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed |
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04-30-2002, 10:09 AM
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#5 |
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Registered User
Join Date: Apr 2002
Location: Houston
Posts: 28
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Thanks for the info. Sounds like a lot of info.that a lot of folks didnt know
------------------ 68GMC SWB Gound-up restoration,350/700R4/???2002 3/4 HD for a daily driver. Can't get away from the GMs
__________________
68GMC SWB Gound-up restoration,350/700R4/????.... 2002 3/4 HD for a daily driver. Can't get away from the GMs |
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