4:10 diff

gottaluv01tahoe · Nov 5, 2024

I'm not super well versed on Tahoes. i am looking into getting a 4:10 lsd for my 01 and i do a lot of highway driving and wonder what the rpm would sit at around 75-80 mph on 265/70R17 tires, which i plan to run soon

justirv · Nov 6, 2024

gottaluv01tahoe said:
I'm not super well versed on Tahoes. i am looking into getting a 4:10 lsd for my 01 and i do a lot of highway driving and wonder what the rpm would sit at around 75-80 mph on 265/70R17 tires

I'm running 3.73's and like the idea of going to 4.10's. I'll be watching for responses as well. There should be someone shortly, or we may have to do the math .

Marky Dissod · Nov 6, 2024

gottaluv01tahoe said:
... looking into a 4.10:1 lsd for my '01.
i do a lot of highway driving, and wonder what the RpM would be @ 75-80MpH on 265/70R17 tires (31.61" tall).

One of the oldest calculators still around:

MOTOR - A Rear Axle Calculator

2500RpM = 82MpH
2300RpM = 75MpH

I wanna do this too, even though I'll need to get rid of my 3.73 front diff as well.
If I drove enough highway, I might look for 3.90 instead.

justirv · Nov 6, 2024

Marky Dissod said:
One of the oldest calculators still around:

MOTOR - A Rear Axle Calculator
2500RpM = 82MpH
2300RpM = 75MpH

I wanna do this too, even though I'll need to get rid of my 3.73 front diff as well.
If I drove enough highway, I might look for 3.90 instead.

Thanks @Marky Dissod, that's the math I knew was out there. I have a front diff to contend with as well. She's no longer my primary ride, so I'm not as concerned for highway miles or mpg. Thanks for the link!

strutaeng · Nov 6, 2024

My suburban 2500 has stock LQ4/4L80e/4.10 and I run LT265/75/16.

75 mph is around 2450 RPM IIRC.

I absolutely LOVE 4.10s

4:10 diff

gottaluv01tahoe

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justirv

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Marky Dissod

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justirv

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strutaeng

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