Join Date: Apr 2008
Location: Beeville, TX
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I think that 5.38 would be way too low for a 7.3l truck, unless you are running some ridiculous tires on it. My 6.4l (higher revving than a 7.3l)F450 with 4.88's is close to 3000 rpms at 80mph. You can't do that with a 7.3l.
With 5.38 gears with 35" tires, in over drive(0.71:1) at 2700 rpms, you will be doing 73.6mph. In my opinion, that is a pretty scary RPM to be cruising at for a 7.3l.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance