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Thread: Rearend Gear size? 96 c1500

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    Senior Member Wyley87's Avatar
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    Rearend Gear size? 96 c1500

    ok i was looking at a post on a different forum where a guy was pulling a trailer and was wanting to change the gears out in the rear end. Anyway i have always wondered what size the gears were in my rear end. How do i find out?

    1996 GMC C1500 with 305 and 4L60-E tranny.
    96 GMC C1500 305 2WD
    K&N FIPK C.A.I.
    Rebuilt Motor and Trans
    Mobil 1 15w50/Mobil 1 Filter

    05 Nissan Xterra 4.0 V6
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    Cost money to go fast...How fast do you wanna go?

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    75K30's Avatar
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    Are you asking for the diameter of the ring gear or the ratio of the gear set?

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    id say you have a 308 ratio and an 81/2 ring gear. not 100% sure though.

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    Senior Member 1500cheyenne96's Avatar
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    well if your asking for the ratio it's more than likely a 3.42 as most of the trucks for 88-98 that was the standard gear ratio for both 2wd and 4wd but some of the 2wd's 1/2 tons had 3.73's as well
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    I have 90 C2500 2WD 3/4 ton 8 lug and I have the 3.73 ratio.

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    i was going off of what my truck had. 81/2 ring 308 ratio.92 chevy 350 700r4. replaced them with 410 ratio and 8 1/2 ring gear.

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    Senior Member 1500cheyenne96's Avatar
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    Quote Originally Posted by gpmorgan View Post
    i was going off of what my truck had. 81/2 ring 308 ratio.92 chevy 350 700r4. replaced them with 410 ratio and 8 1/2 ring gear.
    Really it had a 3.08 stock? wow i've never heard of that for those trucks i know it was pretty common on the 73-87 models but i didn't know that any 88-98's had a 3.08
    THEY DON'T BUILD THEM TO BE EASY TO WORK ON THEY BUILD THEM TO WORK
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    Quote Originally Posted by 1500cheyenne96 View Post
    Really it had a 3.08 stock? wow i've never heard of that for those trucks i know it was pretty common on the 73-87 models but i didn't know that any 88-98's had a 3.08
    yes 308 22mpg highway. but now with engine change and ratio change it gets 10 mpg

  9. #9
    Senior Member 1500cheyenne96's Avatar
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    Quote Originally Posted by gpmorgan View Post
    yes 308 22mpg highway. but now with engine change and ratio change it gets 10 mpg
    yeah but at least it'll get up and go there quicker
    THEY DON'T BUILD THEM TO BE EASY TO WORK ON THEY BUILD THEM TO WORK
    "The Kamikaze"

  10. #10
    Senior Member cajun cruiser's Avatar
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    just jack up the rear end and mark your tires and driveshaft, turn both tires at same speed one rotation while someone else counts the rotations of the drive shaft and thats how to get the ratio, or if you have the codes in the glove box you can look that up

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