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-   -   Switching from 3:42 to 4:10 (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/switching-3-42-4-10-a-4436/)

JohnAdamsR Sep 9, 2007 10:02 PM

RE: Switching from 3:42 to 4:10
 
Smoke- if it takes that long for your truck to shift gears (due to the wheatley tune, i assume.) shouldnt you be getting horrible gas mileage? what are you getting now?

72charger Sep 9, 2007 10:12 PM

RE: Switching from 3:42 to 4:10
 
With 4.10s it won't be that bad but what I meant was with like 4.30 or 4.56 like hunt was saying, that would be crazy to install. Also, changing the rear end ratio always affects top speed. That's the trade off. Top speed vs. acceleration. You want a nice top speed, the low factory gears are good for that. You want acceleration, 4.10s. I definitely wouldn't go any higher than 4.10s though. Not on a daily driver atleast. Maybe if you were drag racing it or something.

hunt4game29 Sep 9, 2007 10:47 PM

RE: Switching from 3:42 to 4:10
 
I am mainly looking for power and mileage so it sounds like 4:10 with 33ish is the way to go. Now if i was to go with 35" tires then i should go with 4:56 but i will not be putting that size tires on this truck i would pay this one off and get another that is not my daily driver and then i can get some 35 or bigger tires and 4:56 or bigger gears for that truck. In years and years to come.

stopspazinout Sep 10, 2007 01:53 AM

RE: Switching from 3:42 to 4:10
 
i just got a new set of tires today, 245 75 16s would 3.73s be a good ratio for them?

Tweaker Sep 10, 2007 02:03 AM

RE: Switching from 3:42 to 4:10
 
Definitely for 16s, my acceleration is definitely there vs other guys with lower gears and same tires. :)

smoke20 Sep 10, 2007 07:23 AM

RE: Switching from 3:42 to 4:10
 
John - it only shifts at those points under heavy acceleration, mlike when you floor it off the line, otherwise it shifts just like your truck. My milage now is 15.5-16.5 with gunning it all the time and showing off, but when I drive it normally it is 17.5+. I have not had a chance to do a long constant run yet though.


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