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Old 02-21-2009, 11:39 AM   #33
NASIOC Vendor/Manufacturer
Member#: 158608
Join Date: Sep 2007
Location: San Dimas, CA / Taichung, TW

The final drive gear is exactly that, the final gear i.e it comes after all the other gears. It doesn't affect the other gears "mechanically", and is basically just a torque converter

A longer final drive (lower numerically) will be more durable than a shorter final drive in terms of the final drive breaking, but causes more radial loads due to the smaller diameter ring gear, and vice versa.

Let me reword that:

Longer Final Drive (e.g 3.7) - More durable, but increases radial loads
Shorter Final Drive (e.g 4.1) - Less durable, but decreases radial loads

Radial loads is what pushes the shafts apart, causing gear mesh misalignment and worn/cracked bearings, ultimately leading to increased tooth wear and/or breakages
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Last edited by MFactory; 02-21-2009 at 11:48 AM.
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