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Jeep Wrangler JK Regear Chart (2007-2018)
Factory transmissions, transfer cases and axle ratios for the Jeep Wrangler JK — with the two tables every regear decision runs on: cruise RPM at 70 mph and crawl ratio, for every ratio you can actually buy. All data verified against manufacturer specs (sources at the bottom of the page).
Factory presets
| Trim / preset | Transmission | Transfer case | Axle | Factory tire | Crawl | RPM @ 70 |
|---|---|---|---|---|---|---|
| Sport (3.21) | 42RLE 4-speed automatic (2007-2011) | NV241 Command-Trac | 3.21 | 245/75R16 (30.5 in) | 24.8:1 | 1,709 |
| Sahara (3.21) | WA580 / W5A580 (NAG1) 5-speed automatic (2012-2018) | NV241 Command-Trac | 3.21 | 255/70R18 (32.1 in) | 31.3:1 | 1,953 |
| Rubicon (4.10) | WA580 / W5A580 (NAG1) 5-speed automatic (2012-2018) | NV241OR Rock-Trac (Rubicon) | 4.10 | LT255/75R17 (32.0 in) | 58.9:1 | 2,502 |
Crawl and RPM computed from the factory ratios listed — load any preset into My Garage and the calculators use it everywhere.
Cruise RPM at 70 mph — NSG370 6-speed manual, top gear 0.84
| Tire | 3.21 | 3.73 | 4.10 | 4.56 | 4.88 | 5.13 | 5.38 |
|---|---|---|---|---|---|---|---|
| 30 in | 2,115 | 2,457 | 2,701 | 3,004 | 3,215 | 3,380 | 3,544 |
| 32 in | 1,983 | 2,304 | 2,532 | 2,816 | 3,014 | 3,169 | 3,323 |
| 33 in | 1,923 | 2,234 | 2,456 | 2,731 | 2,923 | 3,073 | 3,222 |
| 35 in | 1,813 | 2,106 | 2,315 | 2,575 | 2,756 | 2,897 | 3,038 |
| 37 in | 1,715 | 1,992 | 2,190 | 2,436 | 2,607 | 2,740 | 2,874 |
Crawl ratio — first gear 4.46, by transfer case and axle
| Transfer case | 3.21 | 3.73 | 4.10 | 4.56 | 4.88 | 5.13 | 5.38 |
|---|---|---|---|---|---|---|---|
| NV241 Command-Trac (2.72:1) | 38.9 | 45.2 | 49.7 | 55.3 | 59.2 | 62.2 | 65.3 |
| NV241OR Rock-Trac (Rubicon) (4.00:1) | 57.3 | 66.5 | 73.1 | 81.4 | 87.1 | 91.5 | 96.0 |
Axles under this platform
- Dana 30 Carrier break: 3.73 (3.21/3.73 split: 3.73 & lower vs 3.92+ in JK application tables — verify carrier by part number before ordering). JK Dana 30 uses larger JK-specific gears than TJ. 5.13 pinion gets small; 4.88 is the sensible street/trail ceiling.
- Dana 44 (most) / Dana 35 (early base) Carrier break: 3.31 (3.07-3.31 low carrier; 3.55 & higher high carrier). 7.58-in ring, 27-spline c-clip shafts (TJ/JL M200 variant differs). The classic fuse axle: avoid lockers + 35s. Super 35 kits (30-spline) change the math.
- Dana 44 Carrier break: 3.92 (3.73 & down use one carrier; 3.92 & up the other — confirmed by Yukon carrier listings). Non-Rubicon TJ rear is 30-spline; Rubicon TJ is 32-spline rear with air/electric locker variants by year. Practical ratios 4.56-5.13 for 35-37s.
JK non-Rubicon front is Dana 30, rear is Dana 44 on most trims (a strength advantage over JL/JT base rears historically). Rubicon uses Dana 44 both ends with 4.10. Practical ceiling 5.13 front Dana 30, 5.38 rear Dana 44.
Deciding? Run your exact combo in the regear comparison, then let the $39 Decision System turn it into a parts list, a budget and a shop-ready build sheet.
Sources
- Chrysler NSG370 published gear table
- W5A580/NAG1 published ratio table (3.59/2.19/1.41/1.00/0.83)
- Jeep JK factory specification summaries