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Old 02-19-2015, 11:10 PM   #29
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I may be wrong but arent the 6 speed trannys just 4 normal with 2 over?
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Old 02-20-2015, 12:12 AM   #30
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tranny swap or engine repower swap?

Well yes, 4th gear is basically a ratio of 1 so 5th and 6th are overdrives.

It just seems that the md3060 is typically behind lower reving larger displacement and more powerful diesels than the cummins 5.9.

I'm liking the lockup in 4th and 5th and the extra towing capacity of the md3060 over say the allison542. The actual 4th and 6th gearing is just gravy...

If i can sort out the max revs for this tranny being under the 2800-3200 rpm rev limit of my motor, ill pursue the tranny for the lockup feature and towing capacity alone..
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Old 02-20-2015, 05:18 AM   #31
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My coach has Cummins 260 and Allison 5 speed and weighs 23000 lbs.. I tow a 3100 lb. PT Cruiser. I have to unhook my car to get home because of 10% grade. On Hwy. 75 going north to Williamsburg Kentucky , the grade there drops me to 10 mph. I wish i had at least a 350 hp with a 6 speed.
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Old 02-20-2015, 09:49 AM   #32
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Another thought is if one had 2 over they could change axle so maybe net is one over or so.

Increase motor rpm at lower gears to increase climbing ability maybe a bit.

But that would require lots of calculations with someone who really knows the engine well to determine if it woukd really be a benefit.
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