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It can actually be an nice advantage when driving on the freeway in an older vehicle that can at least do 55. I have found my self in the right lane with an 80,000 lb battering ram protecting my six from the crazy four wheelers or weekend warriors. I had a bob tail jump in front of me to protect...

55 mph is the three axle truck, or any trailer, speed limit here in CA. Now I have a two axle truck in the shop that should be capable of triple digit speed once we are done with it.

The 5 tons used the MT654, this is an obsolete trans with only limited support by allison and costly parts. As long as the AT1545 locks in 3 and 4 it would operate the same. The AT1545 is 27.2" long 302 lbs SAE 3 The MT643 is 30.4" long 478 lbs SAE 2 The MT653 is the long and heavy one...

The 4.95 gears with the stock tire diameter would be a nice setup since the truck has an allison in it. An improvement would be the MT643 over the current allison. If you want a stump pulling first gear use the MT653. The navy specified 4.88 gears, allison MT643 and low pro 22.5's. Mine runs...