firehonomichl
Full Access Member
Hey fellas just wondering what it take and modifying to take my ZF5 out and put in a ZF6? It is 4x4 and a 7.3L of course lol
the 6 is essentially the same trans as a ZF5. final OD ratio is a .01 difference.
biggest difference is a granny 1st.
if you don't tow heavy, there is no need to do it.
With mine I did lose topend speed when I rebuilt it to a wide ratio, but I can still do 70 at around 2200 rpms. Towing 18k -20k I can easily let out on he clutch then throttle up.If you want an extra gear, basically you need to go with 3.55s(higher top gear but harder to start off the line towing), or keep your 4.10s and install an overdrive box like a Gear Vendor box.
I have a GV Overdrive on one of my trucks, and it's perfect, but expensive! Low gears for towing, A split 3rd to help if you need, plus double OD for highway cruising.
I don't know why? http://www.dieselhub.com/trans/zf-5-speed.html Wide ratio is .01 /taller/ ratio than short ratio. So you should see a very slight increase in MPH at the same RPM.With mine I did lose topend speed when I rebuilt it to a wide ratio, but I can still do 70 at around 2200 rpms. Towing 18k -20k I can easily let out on he clutch then throttle up.