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Old 03-30-2014, 05:26 PM   #6
Rory McNeil
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Join Date: Jun 2007
Location: from Vancouver BC Canada, now in Nova Scotia
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Default Re: Ordering New Transmission, but What Gears ?

SLR equals Starting Line Ratio. 1rst gear x rear axle ratio.
example, 2.88 x 4.88 is 14.06 SLR.
My Mustang with 3.19x5.13 is 16.36 SLR. I would like even more SLR, but with the steeper 1rst gear, and only a 4 speed, the ratio drops thru the gears get pretty wide. Not as much of a problem for a big engine with good torque, but then you are also pulling a lot more weight.
Also, don`t forget that an engine that doesn`t like a lot of RPM will have less rear end ratio, so to get the SLR more favorable, the only other choice is more low gear. Of course more SLR also increases the chance of wheelspin......
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