as some here know i drive a E350 4x4 SMB with an 7.3 Weight is about 9000lbs,
Dana 60 FF in the rear and Dana Super 60 in front (out of an 2006 F250)
never will use a trailer but will go to a world trip starting in Africa (no highways)
my normal speed on the highway here in germany is 65 mls the highest 75 mls. Faster makes no sense for me....
Now to my problem
I changed from 285/75-17 to 37x12,5 and so also i have to change the gear ratio.
It is 3.73:1 now and still with the 285 it was on the edge.... fuel econmy -what is also an importand point for me- was great but in the montains i missed the bunch.
With the 37 now it is no fun any more.
My question to the specialist here.
I am thinking to go to 4.3 or 4.56 ring and pinions
Is it possible to go to these or do i need than also an other diff case?
As i have an ARB locker in the rear does that mean i need a new one?
Another question i have:
Is there a way to change the 1:1 ratio in the NV 271 transfer case to about 1.2:1 ??? That would be the easiest and cheapest way i assume.
Thanks for giving me some advices!