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Front disc brakes, more wheel travel, locking diffs, taller final drive ratio, no driveshaft angles to worry about and a much better ride. Other than the cost it sounds like win win to me.
I've seen several IRS setups sell on the GL site, but all were Oshkosh and drum brakes. Easter shows to have Front IRS assemblies for as much money as an LMTV. There are also rolling chassis out there but those are pricey.
There should be a glut of them available as DOD is getting rid of all...
Most of the yards will have equipment to jump an LMTV and don't mind helping however if it's dead, then you will have to have a driver with a winch or use a wrecked with a heavy lift. The wrecker option usually costs a couple hundred. I use a guy that has a hot shot type service and knows how to...
According to Meritor that is the correct part number for the 3.07 ratio ring and pinion. There are none in stock but they are still a valid part number and can be manufactured.
The tooth counts do come into play however I am unsure of the calculation. The bevel gear setup is essentially two cones and the diameter of those cones determines the gear ratio. By making the spiders larger, they are covering more distance per revolution, and by making the outer gears smaller...
Refer to my previous post and count the teeth. The bevel gears are a 14 and 24 tooth. Doing the math yields a 1.71 ratio.
Only thing I can figure is either ratios for bevel gears is a different calculation or the parts book for the bevel gears is incorrect.
I do recall Meritor axle information...