Torque change at axles due to rearend gear ratio change
07-24-2013, 09:37 PM
#1
Torque change at axles due to rearend gear ratio change the following chart incorporates all of our commonly available gearsets for the 7.5/7.625 GM 10 bolt rearend.
With NO OTHER CHANGES(such as torque convertor or tire diameter or traction),the chart will show how torque at the rear axles changes,either up(+) or down(-) when you change gearset ratio.
The single number is the ratio you're changing from and the column next to it is the ratio you're changing to followed be a % percent change,either - or +.
Gear ratio affects torque and not horsepower,any change in 'horsepower'can be disregarded because of its' small change.
Torque(rotational force) will affect the ability to accelerate. You still need horsepower behind that torque. A 300hp car with 3.73s' should be able to accelerate better than a 300hp car with 3.23s'.
With NO OTHER CHANGES(such as torque convertor or tire diameter or traction),the chart will show how torque at the rear axles changes,either up(+) or down(-) when you change gearset ratio.
The single number is the ratio you're changing from and the column next to it is the ratio you're changing to followed be a % percent change,either - or +.
Gear ratio affects torque and not horsepower,any change in 'horsepower'can be disregarded because of its' small change.
Torque(rotational force) will affect the ability to accelerate. You still need horsepower behind that torque. A 300hp car with 3.73s' should be able to accelerate better than a 300hp car with 3.23s'.
07-25-2013, 04:31 PM
#3
I've had the 'chart' in written form for quite a few years now,made a digital version a few days ago. I've been familiar with GM 8.2 & 8.5 10 bolts since the 60s'( yes,I'm old). In 2007,I needed to repair my OEM 3.23 rear(blown passenger side carrier bearing). Being that I had a housing with axles,a selection of carriers(3 series Eaton-3 series Torsen-3 series Auburn-2 series Auburn) and many gearsets (2.41,2.73,3.08,3.42,3.73,4.10,4.56),I made up the chart to help me decide what I should build. Back in the 60s',GM musclecars were available from the factory with up to 4.56 gears(sometimes even 4.88s'),so I decided to make a 4.56 rearend for my A4 Camaro,why not go EXTREME. Ran the 4.56s' for 4 years,wicked 1st & 2nd on the street. I'm now back to the OEM 3.23s' since 2012,probably build a 3.73 rear(I have a 3rd housing,the 4.56 rear is still intact and can be put back in if I want to) over the winter to put in in the spring of 2014.
