Join Date: Sep 2003
Location: Washington State
Feedback Score: 0 reviews
Re: ZF 5 speed- close or wide ratio
I thought we had wide ratio boxes because Ford felt the broad torque band of a diesel could drag the rpms back up when you encountered the big rpm drop of the greater spread between gears. I also thought that this is why the gear split between 3rd and 4th is so big...
With a close ratio box, the rpm drop between each gear would be smaller (and better) and we would be better able to use our small rpm range. When towing heavy, the split between 3 and 4 is too big, sometimes you can't get enough uphill speed in 3rd to be able to run 4th. I looked at the ZF6 also, and I recall that 3rd is much closer to direct (4th) than our ZF5s...
Needless to say, but I'll say it anyway [img]/ubbthreads/images/graemlins/grin.gif[/img].... "Correct me if I am wrong"
97 F350 XLT, 4x4, Toreador Red, CC, PSD, MLE0, ZF5, 3.55 l/s, LUK clutch,Velvet Rides, ISSPRO gauges, v/cover vented to tailpipe, DPPI downpipe - modded to 4" right below firewall seam, open element intake using Duralite filter, coolant filter mounted between washer fluid bottle and jack, gutted EBPV, 99+ I/C installed using early 99 Y-pipe and custom pipes, 4-pos chip, BigBopper Seat Mod, Bilsteins, 130cc injectors, homegrown 4" exhaust, uses 36" Magnaflow muffler (Model #12773 body is a full 30" long - nice and quiet!) Custom Fuel System using Carter electric pump, Aeromotive regulator and frame-mounted filters...
2003 Tahoe MS27TT (27' Lite travel trailer), Prodigy Brake Controller.
1991 5.0 LX, runs 12.57 @ 109 mph
My Intercooler/Fuel System Install Webpage (section on CCV Mod too):
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