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Thread: rear end

  1. #1

    Default rear end

    I have a 2000 gmc seirra sle and need to replace the spider gears.I was wondering when I order these and they ask me if it is an 8.5 or 8.6 what they mean and also when they ask me if it is a 10 bolt.How do you tell this .


    THANKS

  2. #2

    Default

    8.5 or 8.6 refers to the ring gear diameter (in inches). Both were used in the 10 bolt differential (14 bolt uses a 9.5 or something like that). I don't know what year was the cut off, but the smaller (8.5) was used in older 10 bolts, 8.6 was used in newer.

    10 bolt axles were used in half ton models, 14 bolt was used in 3/4 ton-1 ton models.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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