Go here and plug in the JL numbers, it works.Do we have enough info to create gearing charts for at least the pentastar in the JL like they have for the JK?
If youâre comparing the Gearing chart to something like this, it would be virtually the same as the engine is only ever so slightly tweaked in the low RPM not impacted, and the charts are calculated at 1:1 so 4th & 6th gear in the new manual & auto respecively versus 5th and 4th in the old MT/AT transmissions.Do we have enough info to create gearing charts for at least the pentastar in the JL like they have for the JK?
No flaw, just like 1st gear itâs simply an optional choice from the mfr. and the previous MT / AT NSG370 / NAG1 were similarly disproportionate @ 4.06 & 3.16 respectively. Definitely noticeable in the JK too.Well, only 3.53 on reverse for the automatic transmission (compared to 4.49 for the manual transmission). Does anyone know if they made it on purpose? Or isn't that a flaw or something?
Basically, with the new transmission, if you go up a tire size, you probably shouldn't need to re-gear, if you go up two sizes, jump 2 gear sizes. On a Rubicon, this means, going from 33's to 37's, you should go from 4.10's to 4.56's to maintain the same RPM band as stock.Iâve screwed up too many cars on Gran Turismo to even think about messing with gears in the real world. Sounds like you guys know your stuff but this thread is miles above my head!
Great info!Go here and plug in the JL numbers, it works.
http://www.grimmjeeper.com/gears.html
TRANSMISSION: 850RE AUTOMATIC, EIGHT-SPEED OVERDRIVE
TRANSMISSION: D478 MANUAL, SIX-SPEED WITH OVERDRIVE
- Availability: Standard â 2.0-liter I-4; Optional â 3.6-liter V-6
- Description: Adaptive electronic control or Electronic Range Select (ERS) driver-interactive manual control and electronically modulated torque converter clutch
- Gear Ratios:
- 1st - 4.71
- 2nd - 3.13
- 3rd - 2.10
- 4th - 1.67
- 5th - 1.28
- 6th - 1.00
- 7th - 0.84
- 8th - 0.67
- Reverse - 3.53
TRANSFER CASE: NV241 COMMAND-TRAC
- Availability: Standard â 3.6-liter V-6
- Description: Synchronized in all forward gears and Reverse, multi-rail shift system with top-mounted shift lever
- 50% shorter throws
- Gear Ratios:
- 1st - 5.13
- 2nd - 2.63
- 3rd - 1.53
- 4th - 1.00
- 5th - 0.81
- 6th - 0.72
- Reverse - 4.49
- Final Drive ratio - 3.45 standard, 3.73 optional (4.10 Rubicon)
TRANSFER CASE: NV241OR ROCK-TRAC
- Available: Standard on Sport and Sahara
- Type: Part-time
- Operating Modes: 2WD High; 4WD High; Neutral; 4WD Low
- Low Range Ratio: 2.72:1
TRANSFER CASE: MP3022 SELEC-TRAC
- Available: Standard on Rubicon
- Type: Part-time
- Operating Modes: 2WD High; 4WD High; Neutral; 4WD Low
- Low Range Ratio: 4.0:1
AXLES
- Available: Optional â Sahara
- Type: Full-time
- Operating Modes: 2WD High; 4WD High; Neutral; 4WD Low
- Low Range Ratio: 2.72:1
- Front: Dana 30, Dana 44 on Rubicon models
- Differential Type: Open (Dana 30) or Tru-Lok electronic locking (Dana 44)
- Axle Ratios: 3.45, 3.73, 4.10
- Rear: Dana 35, Dana 44 on Rubicon models
- Differential Type: Open (Sport and Sahara) with available Trac-Lok anti-spin, Tru-Lok electronic locking (Rubicon)
- Axle Ratios: 3.45, 3.73, 4.10
I don't know, you can plug in the numbers on the site and find out though.Great info!
The 3.73 is no longer a factory option. Sport/Sahara get 3.45 and Rubi gets 4.10 for both 6MT/8AT.
Would the 3.45 be numerically equivalent to the JK 3.73 with the new JL 8AT since you have 5 gears before hitting 6th 1:1 ratio?
So this M/T is double overdrive, with 4th at 1:1 and 5th and 6th as overdrives. Same as my honda. Are you saying that the old 6 speed was not double overdrive? 5th was 1:1 in the mercedes unit? That would make this new transmission seem significantly taller geared than the outgoing one.If youâre comparing the Gearing chart to something like this, it would be virtually the same as the engine is only ever so slightly tweaked in the low RPM not impacted, and the charts are calculated at 1:1 so 4th & 6th gear in the new manual & auto respecively versus 5th and 4th in the old MT/AT transmissions.
So this M/T is double overdrive, with 4th at 1:1 and 5th and 6th as overdrives. Same as my honda. Are you saying that the old 6 speed was not double overdrive? 5th was 1:1 in the mercedes unit? That would make this new transmission seem significantly taller geared than the outgoing one.If youâre comparing the Gearing chart to something like this, it would be virtually the same as the engine is only ever so slightly tweaked in the low RPM not impacted, and the charts are calculated at 1:1 so 4th & 6th gear in the new manual & auto respecively versus 5th and 4th in the old MT/AT transmissions.
First gear yes, others no, and the combination for overdrive favours the 8AT+3.45 by 15% over the 3.21 axles, and by 33% over the 3.73.Would the 3.45 be numerically equivalent to the JK 3.73 with the new JL 8AT since you have 5 gears before hitting 6th 1:1 ratio?
Yes, the new MT and AT both have two OD gears, whereas in the JK the 6spd NSG370 MT was 1:1 in 5th, and the 5spd NAG1 AT was 1:1 in 4th, so just 1 OD each.So this M/T is double overdrive, with 4th at 1:1 and 5th and 6th as overdrives. Same as my honda. Are you saying that the old 6 speed was not double overdrive? 5th was 1:1 in the mercedes unit? That would make this new transmission seem significantly taller geared than the outgoing one.
The gears felt tall even in the 4:10 axle ratio JLUR I test drove. With the 3:44ish ratios in the Sport, I might not be using 6th gear very much.Yes, the new MT and AT both have two OD gears, whereas in the JK the 6spd NSG370 MT was 1:1 in 5th, and the 5spd NAG1 AT was 1:1 in 4th, so just 1 OD each.