46u, I'm going to pick your brain for a bit if you dont mind.

I had an RS4 Evo with a .18 OS CV-R in it with 19/23 cb and 41/37 spurs. Put that in the MT and the tires are way to big to turn over. Doesn't shift out of 1st and stops at about 1/2 the rpm range.

do you have a 2 speed in your truck? I've been crunching numbers all morning to figure out what I want to use. Stock MT gearing for the single speed is 4.33 (12t cb and 52t spur) so I really want 1st gear to be around 4.33 Here are some ratios I worked out. (sorry there are a lot)

I'm liking these first two options. 4.73 1st gear ratio would be CRAZY accel with the bigger motor yet be faster in second gear than a stock MT. The next ratio is awesome too, almost stock gearing for accel but 2nd is a lot smaller for a lot of top end.

gear ratio options with 11/14 clutch bell

spur (52/49)
1st gear – 4.73
2nd gear – 3.50

spur (47/43)
1st gear – 4.27
2nd gear – 3.07

spur (43/39)
1st gear – 3.91
2nd gear – 2.79

spur (41/37)
1st gear – 3.73
2nd gear – 2.64

gear ratio options with 12/15 clutch bell

spur (52/49)
1st gear – 4.33
2nd gear – 3.27

spur (47/43)
1st gear – 3.92
2nd gear – 2.87

spur (43/39)
1st gear – 3.58
2nd gear – 2.60

spur (41/37)
1st gear – 3.42
2nd gear – 2.47

gear ratio options with 13/16 clutch bell

spur (52/49)
1st gear – 4.00
2nd gear – 3.06

spur (47/43)
1st gear – 3.62
2nd gear – 2.69

spur (43/39)
1st gear – 3.31
2nd gear – 2.44

spur (41/37)
1st gear – 3.15
2nd gear – 2.31