No. 2 might include the stronger 2024 factory case too.This is pretty much the upgrade choices.
1. Good- Stock OEM axles and trans case.
2. Better- Upgrade axles to RCV or other brand and sport trans case.
3. Best - Upgrade to Tons, D60's or other and Atlas trans case.
4. Ultimate - Custom build. No budget.
I fall in the #2 category for type of wheeling and budget. I've got RCV 300m for front & rear and getting the sport case later this year. I still could do 40's with new steering and tire carrier. And, maybe a taller lift or sawzall body modification.
Sport Tcase Swap
- Thread starter POTTERJLUR
- Start date
I've had my Atlas for about 2 years now. As far as noise I can't tell the difference between the Atlas and the stock case. Shifting is definitely a bit harder and you need to almost come to a rolling stop to get it in gear. Just about the time you think you are going to quit rolling forward it pops into gear.
The 24+ trans case is not adaptable in the 21-23. The electronics are not compatible. The sport case is not all wheel drive and has no clutches.
Amazing that they can not be backwards updated.
roaniecowpony
Well-known member
So, how good/bad is the case in my 2026?
I know, right. If all the software was unlocked it probably would be. Stellantis has it locked down pretty good.
The issues with the 21-23 have been fixed in the 24+ models. Personally, I wouldn't be getting the sport case in my 22 if I had a 24+ model. I'll have to edit my post. Also, the full float rear axles are really good and less expensive to update the axles than the semi float.
Last edited:
- Mar 25, 2026
- 81
- 100
- Current Rides
- 2023 Jeep wrangler rubicon 392, 2023 widebody challenger 392 scatpack shaker, 2020 HD CVO tri glide.
I've had no / zero troubles with my do it myself swapped sport back half hybrid tcase. I have a totally stock 392 wrangler rubicon daily driver that only gets off roaded on construction sites and the occasional weekend expeditions mostly mild climbing trails. I think I've put about 4000 miles on it so far and I did get up to 120 mph once just to see what it would do, I am sure it would go faster but not with me driving, it that was enough to satisfy my need for speed. As for durability there are video's earlier in this forum of one guy racing his swapped tcase stock axles on the local drag stip with 40's no less. My opinion is that for average daily drivers or those who plan to build a moderate jeep this is an option that is well worth it. If you have the budget for 1 tons and plan to do extreme wheeling the Atlas would be the better option.
roaniecowpony
Well-known member
My finished configuration goal is a vehicle that is very capable, but still is a nice highway driver. So, no 40s. I think 37s or 38s, a 3.5" long arm, Atlas 3.8:1, D60 semi-float rear (to keep it light) and maybe a caster/pinion angle adjusted D60 or D44 front. Free spin front hubs would be a bonus, but 5x5 bolt pattern can't accommodate that. I don't want to buy things twice. So, it seems like the going to the Atlas case, axles, and wheels are tied together.
Red Rubicon
Member
Scott Blum the Jeep Manager for Wrangler Product Planning stated on the first page of this discussion that you won't blow up the Sport tc conversion with either a 426 or a Hellcat that is good enough for me.
roaniecowpony
Well-known member
Is the Rubicon case compatible?
- Nov 5, 2023
- 1,463
- 2,616
- Current Rides
- 2023 Wrangler Rubicon 392, 2024 Wrangler Rubicon X
That would be way too easy
From my understand its a trans output bolt pattern issue, time and money solves anything thought
and like others have said I don't think a 4:1 would be optimal for out motor, prob would be a major PIA to stop in low.
even my light weight yota crawler in double low (2.2/4.7) in 1st gear was iffy to stop cus it would pull though the breaks at idle and that was just a clapped out 3L v6 with maybe 80lbs or torque.
the JL Rubis default to 2nd gear when in 4low and you have to manual shift it into 1st
our 1 gear is 4.71 so with 4.56s and a 2.7 case its already as low as a JK rubi auto with 4.10s
JL XR 392: 58:1
JL rubi XR case: 2nd gear 57:1, 1st gear 85:1
JK rubi (4.10s) manual: 73:1
JK rubi (4.10s) auto: 58:1
also we have 350lb-ft of torque at idle... which is like double the v6 and 3 times of the I4
in a perfect world I think a 3:1 would be really nice, would get us at 64:1 with the factory 4.56s
- Mar 25, 2026
- 81
- 100
- Current Rides
- 2023 Jeep wrangler rubicon 392, 2023 widebody challenger 392 scatpack shaker, 2020 HD CVO tri glide.
The front half with the high & low planetary gears stays with the original 392 jeep, it doesn't even have to be removed from the transmission at all to do this swap. Only the back half gets removed and replaced with the back half from a non 392 jeep. The 392 MP3022C front half will bolt directly up with the rear half of a
MP1622C from a jeep sport. The housings have the same bolt pattern and are the same measurement from the centerline split to the rearface of the rear driveshaft attachment flange in fact even the splined flanges that bolt to the front and rear driveshafts are the same.
roaniecowpony
Well-known member
But hasn't AMW4x4 built scores of 392 and even Hellcat and Demon powered JL and JT jeeps with the Rubicon case?
I believe they use the host transmission and T case vs a wrangler 392 engine and transmission
ag4ever
Well-known member
Most of my scramblers have Dana 300 cases. That is very similar to the atlas case, and all are impossible to shift sitting still. Most are difficult to shift while moving.
The chain drive cases are much easier to shift due to the slop in the chain. That slop makes them weaker than a gear transfer case.
All that said, Scott Blume has been quoted as saying the sport case can handle more power than a hellcat can deliver. I think he said another component will fail before the transfer case. (Non clutch transfer case that is)
The chain drive cases are much easier to shift due to the slop in the chain. That slop makes them weaker than a gear transfer case.
All that said, Scott Blume has been quoted as saying the sport case can handle more power than a hellcat can deliver. I think he said another component will fail before the transfer case. (Non clutch transfer case that is)
ag4ever
Well-known member
I did some minor wheeling on my deer lease this weekend, not sure I would want 4:1 with the 392. Just way too much torque multiplication.
roaniecowpony
Well-known member
I recalled something about a rubicon transfer case to 8HP75 installation and found it. It's in the Ozark Overland video #2 of his Gladiator 5.7 AMW4x4 installation. To put a Rubicon transfer case on the 8HP75 (392 transmission), you replace the front case with a 392 part. Don't know if there's an input shaft change required yet.
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