gear ratio of a stock 1982 GMC 1500 4X4 PICKUP TRUCK Diesel Engine?

5 Responses to gear ratio of a stock 1982 GMC 1500 4X4 PICKUP TRUCK Diesel Engine?

  1. John A November 17, 2010 at 5:30 am #

    There is a white sticker on the fender well under the hood….drivers side….if not you will have to pull the diff cover and get the numbers off the ring gear…it will say the number of teeth on the ring and the number of teeth on the pinion…divide the two and you will get the answer…example 41 11 = 3.73

  2. frfiter November 17, 2010 at 5:30 am #

    there is a little metal tag attached to one of the bolts on the center part of the rear end, back where the drive shaft is connected, that should have the gear ratio stamped on it. It should also be part of the VIN number. take the vin number down call a dealer and ask them what the ratio is.

  3. Older1 November 17, 2010 at 5:30 am #

    It can vary, there were many. You have to know the RPO code in the glove box. If the white sticker is gone or not the right one for the vehicle then there should be numbers on the housing. On the axle tube , you’ll have to scrape and clean. The ratio numbers are stamped in the housing but that is no guarantee the gears have not been changed.
    RPO codes are three characters,the ones for the differential start with a G, Then you need a book to tell you which ratio it came with.
    Most likely it’s 3:23
    It can be 3:08, 3:23,3:50,3:73,4:10 and if it’s RPO G80 it’s limited slip too.

    There is no set answer for your question though because they were built with different options.

  4. Don B November 17, 2010 at 5:30 am #

    Yes, like Older1 mentioned check the SIPI sticker(either in the clove box or the driver’s door jam) for the correct RPO code listed for the rear-end gear ratio. It should be one of the followin:

    GQ1 — AXLE REAR, STD RATIO
    GT4 — AXLE REAR, 3.73 RATIO
    GT5 — AXLE REAR, 4.10 RATIO
    GU4 — AXLE REAR, 3.08 RATIO
    GU5 — AXLE REAR, 3.23 RATIO
    GU6 — AXLE REAR, 3.42 RATIO
    G80 — AXLE REAR, LIMITED SLIP (POSITRACTION)

    If, you don’t see it listed there try the Ultimate RPO Listing below.

  5. MFFL November 17, 2010 at 5:30 am #

    10/10!