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G,day i am newish to the game of doing up cars so please excuse my ignorance...i believe that the 9 inch diff i have...has a ratio of 4:33.1... that i believe is going to scream on the open road...i have a stage 2 shift kit and 2500 stall convertor to go with the 308...what is a better ratio for highway and still have good take off???
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I think you're right!!
I have a efi 308 running a turbo 700 with a stage 2 shift kit, and a 3.9:1 LSD diff ratio.
Personally I'm pretty happy with it....great take off and criuses nicely in 4th or whatever the equivalent is in autos. |
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If you do a bit of highway cruising you'd be better off with a ratio like 3.08:1, she'll still sit at about 2500RPM at 100km/h (if its not an overdrive). You should still get a decent take off too... If your more about the accelerating side of things, t
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Thank you all for replies have taken note and will update with the progres of my beast!!!
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I have a 3.08 diff in a 308 ute with M21 and find it a bitch to get moving but pretty good on the highway. 3.36 is where I'm headed.
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You are much better of leaving the 3.08 and rebuilding the M21 as an M20 or M22. That way you get a 1st gear (when using an M22) of the equivalent to an M21 with a 4.53 diff. An M20 with a 3.08 is the equivalent of an M21 with a 3.78 diff. With either you |
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The ute came with a 3.36 and the original owner put in the 3.08 diff as he was doing a lot of highway miles. I'm going back to the 3.36 for originality as the 308 motor and M21 gearbox were original.
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