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Backing plates for 78' 1 ton dually

Discussion in 'Chevy Trucks' started by gamfa, Jan 6, 2004.

  1. gamfa

    gamfa Junior Member
    Messages: 20

    Can someone tell me if the rear backing plates on the 78 1 ton rear with the 13"x3 1/2" brakes are the same as those on the 1985 1 ton w/13"x3 1/2"? Does anyone have the GM part number for the 78 plates? I have the ones for the 85 plates.
  2. JMR

    JMR Senior Member
    Messages: 567

    From all the info I have the parts from 77-86 will interchange. Comparison upon removal and installation would be advised.
  3. gamfa

    gamfa Junior Member
    Messages: 20

    I would check for a match before installing as a normal course. My problem is that I not sure what year the rear end is from. It has an "assembled from parts" title. The frame is a one ton frame. I've checked that with other C-30 and 3500 frames. The engine is an 82 6.2 diesel. The SM 465 I believe to be 80 or older only because of the back-up light switch that was in it. The NP-205 does not have a 4x4 light switch in it that I can find but I know it doesn't have one at the location that the 85 NP-205 does. The dually rear I believe to be 78 (or older) only because the locking system for the bearing lock nut that was on the spindle was the type used in 78 and older. I bought brake shoes for a 78 and they match what were on the truck. The truck was converted to 4x4 but does not have a Dana 60 front axle but it is 8 bolt so I have no idea what it is.

    I've found a site that sells orig. GM parts that has the 85 plates for $32 and change each but you have to know the GM part no. to search for the part. I've got a copy of the Government CD of all the parts and maint. manuals on the mid 80's Army 3/4 and 1 ton srw and dually GM trucks and used that number to search. I hate to mail order it and it not match. It might be a hassle to return it.

    I thought I might get by with the current plates but the raised areas where the shoes ride are gouged out bad. I thought I might be able to smooth them out a little with a grinder and file but if I could get new ones for $65 or so I would probably go that way. Any suggestions or possibly the 78 part number??