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Color me surprised..
07=1600 peek tork 24v 5.9
07.5=1500 peek tork 6.7
With your larger 33.83" tires vs31.73"
Taller gears 3.72/3.42 vs 3.55
Your spun up tighter 1750/1640 vs 1605 ( calculated including 5% extra for no lockup)
The difference is a.79/.74 vs .69 OD in the late 1st gen (91.5-93).
In my opinion your 1640 is perfect for 60mph. As the engine boogs down/lusing rpm the tork gos upto peek. Seeing as you are building a tow truck insted of a mileage monster. For me its 65mph that allows this drop to peek.
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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