idi zf6
Cargo Master
Joined: Nov 2003
Posts: 2,585
Likes: 1
From: Duluth, Mn.
Well then You don't think right. 
There's a reason the 6 needs a cooler.
The difference in gears between the 5/6 are minimal. I doubt You'd see 130 RPM drop in OD. It takes more HP to turn the 6. So it's a wash.
There's a reason the 6 needs a cooler.
The difference in gears between the 5/6 are minimal. I doubt You'd see 130 RPM drop in OD. It takes more HP to turn the 6. So it's a wash.
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
The reason for a cooler is probably the increase of power going through the transmission, decreasing the drivetrain loss ratio, increase of load capacity and other design criteria. I highly doubt they put a more inefficient transmission into a newer, more efficient vehicle.
Cargo Master
Joined: Nov 2003
Posts: 2,585
Likes: 1
From: Duluth, Mn.
The reason for a cooler is probably the increase of power going through the transmission, decreasing the drivetrain loss ratio, increase of load capacity and other design criteria. I highly doubt they put a more inefficient transmission into a newer, more efficient vehicle.
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