Yeah. Your ratios are good for an OM636. One of the weaknesses of these Benz engines (especially the normally aspirated ones) is poor low-RPM torque. You'll need the gears. At least it will drive the accessories without a speed-up pulley.
You can get decent torque from a OM617, but that requires a VNT turbo from a Sprinter and turning the ALDA way up.
How much does a OM636 weigh?
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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