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"I have marveled often at the thin line that divides success from failure and the sudden turn that leads from apparently certain disaster to comparative safety." Ernest Shackleton, Antarctic Explorer, Sea and Land, 1874-1922.
The price isn't bad for the conversion. However, the auto trans kills it for me.
For fuel econ you want to keep the rpms in a narrow band, 1200 on the low end and 1600 up high. The 6 speed, IIRC has an 800rpm band between shifts. That's out of the sweet spot by 200rpm's at both ends of the shift.
The 10speed UltraShift can keep you in that 400rpm sweet-spot. The 12speed ZF has a slightly tighter band.
Plus, the Ultra and the ZF are both lighter than the Allison and both require less maintenance.
not much info in that add.....
but i agree with James; that automatic will kill a 300 hp engine. add a big trailer and that thing will be painfull slow on any hill
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-our Pete "379" Toterhome (Cummins N14/ Super 10 trans) https://sandcentral.net/trucks
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-in the shop: Pete "38