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Old 07-01-2017, 06:32 PM   #1
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Join Date: Apr 2004
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Default rear ratio

Looking at purchasing a new Freightliner Cascadia day cab, Detroit with auto shift, twin screw, noting fancy. It will become a 40-42 foot unit, 18 ft garage, 22-24 foot living. Mostly to visit family across the county. What would be the best rear ratio for cruising about 75 with this unit. I plan on carrying a Toyota Rav or Honda CRV in the garage, still should not be over 50k loaded.

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Old 07-01-2017, 07:08 PM   #2
Join Date: Jul 2012
Posts: 57

Two articles on the subject I've found helpful:

10-4 Magazine - For Today's Trucker

Working Together | 10-4 Magazine

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Old 07-03-2017, 09:55 AM   #3
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Location: Tomball
Posts: 1,414

our (Freightliner Columbia MBE 450/1650 hp/tq) is equipped w/ the 12 speed Meritor ZF Freedom Line SmartShift and a 3.21 rear...and at 70 MPH we turn just under 1500 RPM.

at 65mph we're turning 1300 RPM

Although I havent recorded the RPMs at 55mph I know its a sweet spot for MPG (13.3-ish from Atlanta to Destin) - at 70mph we consistently achieve 9.9 mpg (hand calculated and reportedly better than most).

I'd love to be able to run 75 at 1300
Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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