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The ring and pinions can be swapped provided the proper adjustments are performed.

Rockwell built the axles then Meritor bought out Rockwell's axle division. You have standard LMTV axles, nothing special. Rockwell, Meritor, and Axletech all made those axles. They are for all intents and purposes the same, the only difference is early axles had a fabricated steel housing and...

385/65R22.5 are 43 inches in diameter so you will loose 3 inches and won't do anything for higher top speed.

3.07 will get you to 74-75 mph... Scott

I got a quote from them and it was $3200 per gear pair new from Meritor and it would take 120 days. There are no Meritor gears with a ratio higher than 3.07.

The military does use off the shelf components, the axles are meritor RF-611 axles. In my travels I've not found anything else remotely close to working.

10mpg with the 6.14 final drive ratio at 60 is about right. However crank up the speed to 74 and you are back at 7-8 mpg.

Gallons Per Mile? That is horrible.

What? even with the taller gears I didn't see 8mpg.

Best forward speed I could get out of my 3126 was 75 mph going downhill. 74 was attainable on flat stretches of road.

My butt dyno reads there isn't any low end sacrifice.

I've wondered if it were possible to get more gears from the 3070 by using different combinations of shifting elements. Most auto manufacturers have done this with minimal hardware changes to the actual transmissions.

There is another 800 rpm or so to be had with regards to driveshaft speed before the equations put things out of the safe zone. The vast majority of LMTV driveshaft issues are the result of worn out slip yokes or imbalanced driveshafts. However Driveshaft speed is determined by the road speed...

I've not heard of being able to add an 8th gear to the 3700SP, can you provide additional information?

Run the goodyears and your tie issue is fixed. I run 75 on my LMTV and have has zero issues except less trips to the fuel station.

Sent you a PM Ultimatehellhound

The only difference between a 290 horse and the lower horsepower engines is a few turns of the fuel screw and injector settings.

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...