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gearing questions

Discussion in 'The Garage' started by scuzmuz, Aug 27, 2002.

  1. scuzmuz

    scuzmuz Newbie

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    i have a 90 full size blazer. it just broke the rear pinion. i'm not sure what gearing is in there now, so i was thinking of going 4.56 or 4.10. any recommendations? it has 38.5 inch tires but they are getting old so i would go down to 36 with the right gearing or stay at 38, it doesn't matter too much. also would like to know what the o.e.m. gearing was in that truck because i have a feeling that's what is in it right now.
     
  2. BigOrange90Jimmy

    BigOrange90Jimmy 1/2 ton status Premium Member

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    you drove it with the stock gears on 38.5?!?! not that, but you used the stock AXLES?!?!?! HOW? the biggest ratio even offered for those was 4.10's, if i recall correctly. if you're running the TH-700, i'd say 4.10's at least with a 36. 4.56's or 4.88's with a 38.
     
  3. 83PJW

    83PJW 1/2 ton status

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    go with 4.10s because thats a stock gear for a 14 bolt ff, and you would have a straight bolt on addition on your rig. also another plus i run 36s and have 410s and it set my speedometer pretty acurate.
     
  4. MudbogAD

    MudbogAD 1/2 ton status

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    You can go lower than 4.10 with 10 bolts. Precision gear makes 5.13's for them. I run 39.5" swampers with my stock axles and haven't broken anything yet, even with my stage 2 shift kit. I have a 14FF waiting to be rebuilt and installed but I'm using my 12 bolt currently. I would recommend 4.56's for you even if your going to 36's.
     

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