I have a 98 4.0 with the AX-15 transmission & recently regeared to 4.88. Am I calculating my crawl ratio correctly at 51? (3.83 first gear x 2.72 transfer case x 4.88 gears)?
Crawl ratio (am I doing this correctly?)
- Thread starter Andy Maurer
- Start date
yup, you just multiply all the gear ratios in the system to get the total ratio.
Many years ago Teraflex produced a kit to covert the NP231 from 2.72 to 4.0:1, but it is my understanding that they stopped producing the kits due to a weak design and small planetary gears.
In my 98 XJ 4.0L with AX-15 I used the 4:1 for 20 years without a problem (used Redline ATF) which gave me a 70:1 crawl ratio.
In my 98 XJ 4.0L with AX-15 I used the 4:1 for 20 years without a problem (used Redline ATF) which gave me a 70:1 crawl ratio.
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Just think if you had a non-Rubicon it would be 2.72*4.10*4.01 = 44.72 A huge difference and worse than your old 50.83 YJ
I always knew this made a difference but I really found how much this difference makes when I drove my buddies TJ, I was always asking him why is he always on the gas so much well I found it why.
His 1999 TJ with an AX-15 (3.83) Sport Model with a NV231 TC (2.72) and gears (4:88) = 50.84
vs mine
2005 Rubicon NSG370 is (4.46) NV241 Rock-Trac (4.0) gears (4.88) = 87.06 that's over a 50% difference
From what I gather, crawl ratio matters less with an automatic thanks to the torque converter.
If there were other reasonable options than the 42rle, I would gladly make the switch.
Yea as jjvw stated all Wranglers share the same Transmission's, it's the Transfer Case that makes the difference between the Rubicon's vs all other Wrangler models
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