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Thread: 4l80E users. What ratio rearend are you guys running?

  1. #11
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    Dec 2009
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    Quote Originally Posted by LamboDoNoMo View Post
    80eout of a 05 hd, 3200 stall 4:11 gears 65-70 at 2500rpms, hit 152mph and still had overdrive, top speed is unknown
    WHat size are your tires?
    2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
    Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.

  2. #12
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    Thanks for all the replies. Keep them coming. I'm thinking I might run 4.56's because I have 31.6" tires. With my current 65e and 3.73 rearend I am at about 1950 at 70. I just bought an 80e today. Damn Stunna I bet your truck is pretty squirly with that rear/tires!
    2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
    Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.

  3. #13
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    yea it is lol

  4. #14
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    THE MEAN STREETS OF OKLAHOMA
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    Quote Originally Posted by Chris092183 View Post
    WHat size are your tires?
    31.48 I believe
    THEY CALL ME G.

    AZRAEL

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  5. #15
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    Quote Originally Posted by LamboDoNoMo View Post
    31.48 I believe
    2500 sounds a little steep for me but I just checked my tires I actually have 255/75r17's (32.1") I thought I had 265/70r17's for some reason.
    I just came up on a used set of G2 4.10 r&p (about 5k miles). It was a straight trade for some stock 3.73's I had laying around.
    My stock tires were 245/70r17 so if I weren't to do the 80e swap, in order to get to my stock rpm range through out the gears I would need:
    Current gear*Upgraded tire size/Original tire size=needed rear end ratio
    3.73*32.1/30.5=3.92 So running a 4.10 will make my truck run at a little higher rpm with my 65e. Now that I am in the process of doing the 80e swap I know my final drive will be at an even higher rpm do to the 80e's .75 final drive compared to my 65e's .70 final drive. I think the 4.10's will definately help out the 80e's first gear 2.48 though. I have trouble with traction with the 65e's 3.06 first gear but then again I have a stock one wheel peel. we'll see how it goes
    2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
    Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.

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