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The Zf 6 Speed is used thru the whole product line and will stand up quite nicely to a Fairly hot Cummins motor as well. 425/800
Early ZFtrans prior to 04 had a 31 spline output shaft
05 and up were 34 spline units.
I ran my 05 Zf thru 350, 000 miles with only minor work towed some big stuff on occasion.
I can believe this but im not driving a hot cummins and im putting more than 425/800 to the wheels I have a dual disc in my truck but I need alittle rehab on the hydraulics for the clutch so I dont keep grinding second when I drag race. Thanks for the inpput found out some good facts I never knew
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