Transfer case gears

fishEH

fishEH

Well-known member
Jan 26, 2009
6,930
203
Lake Villa, IL
I meant to comment on your thread on ExPo. Here's my two cents.
Jump on the Ashcroft site and run some numbers. Start with stock and then try different tire size, gears, etc. Find a combination that gets your RPM's into a suitable range.
Ideally you could just increase your tire size and it would be good enough, since you need new tires anyway. You also mentioned $$$ as a concern with adding more lift. I would guess that the money spent to correctly run more lift would be equal or less than the cost to have someone change your R&P

If I were you I would try my hardest to keep my diffs because they're sweet. I'd run a little more lift and try to squeeze 36-37's in there. The expensive part of running big tires has already been done in the lockers, gears, pegged diffs. I haven't run the numbers and I don't have time to. Maybe going from a 33 to 35+ would drop your RPM's enough to be acceptable. If not then IDK. I wouldn't go trading for non-selectable lockers though.
 
C

corbinwalp

Member
Oct 5, 2013
8
0
Dallas
fishEH said:
I meant to comment on your thread on ExPo. Here's my two cents.
Jump on the Ashcroft site and run some numbers. Start with stock and then try different tire size, gears, etc. Find a combination that gets your RPM's into a suitable range.
Ideally you could just increase your tire size and it would be good enough, since you need new tires anyway. You also mentioned $$$ as a concern with adding more lift. I would guess that the money spent to correctly run more lift would be equal or less than the cost to have someone change your R&P

If I were you I would try my hardest to keep my diffs because they're sweet. I'd run a little more lift and try to squeeze 36-37's in there. The expensive part of running big tires has already been done in the lockers, gears, pegged diffs. I haven't run the numbers and I don't have time to. Maybe going from a 33 to 35+ would drop your RPM's enough to be acceptable. If not then IDK. I wouldn't go trading for non-selectable lockers though.
Click to expand...

True, but 35" on a Discovery is rare, let alone 36 or 37. With 4.11's and 33" I'd be at ~2500rpm at 70mph, and with 4.75 and 36" I'd be at 2700rpm @ 70mph. Not a huge jump for the amount of money It'd take to get those big tires
 
Jimmy

Jimmy

Well-known member
Apr 10, 2006
743
64
Aurora, CO
What's the biggest factor for you to get the RPMs to a comfortable range, money? If it isn't money, then what is it, time?

What is the RPM range you want to get to?

Figuring this out will help generate better responses.
 
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