Anyone planning on regear their 392?

[Laserflorida]

392 coming with 3.73. Planning on 37’s. I put 4.56 on my 2019 Moab with 37’s with a very noticeable improvement in ride quality. Anyone planning on regearing their 392 with larger tires?

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[Laserflorida]

any recommendations?
i spoke to someone at 4 wheel parts today and they had no idea that the 392 was a production item and no idea of the gearing.

 

[rustyshakelford]

I’d drive it first and go from there. With the power it puts out, it might be able to compensate fine and drive terrific

brett

 

[AnnDee4444]

Transmission gearing is the same as the other automatics: https://s3.amazonaws.com/chryslerme...bicon_392_Specsla6s2mf70hctfgb5q521eniaq4.pdf

 

[word302]

Transmission gearing is the same as the other automatics: https://s3.amazonaws.com/chryslerme...bicon_392_Specsla6s2mf70hctfgb5q521eniaq4.pdf

Yeah but torque multiplication will be “slightly” better

 

[AnnDee4444]

Yeah but torque multiplication will be “slightly” better

Actually it's slightly less than the theoretical maximum of a 2.0 Rubicon in 4-low.

2.0: 295 lb.-ft. x 4.71: first gear x 4:1 transfer case x 4.10:1 differential ratio = 22,787 lb.-ft. @ axle

392: 470 lb.-ft. x 4.71: first gear x 2.72:1 transfer case x 3.73:1 differential ratio = 22,459 lb.-ft. @ axle

 

[oceanblue2019]

Actually it's slightly less than the theoretical maximum of a 2.0 Rubicon in 4-low.

2.0: 295 lb.-ft. x 4.71: first gear x 4:1 transfer case x 4.10:1 differential ratio = 22,787 lb.-ft. @ axle

392: 470 lb.-ft. x 4.71: first gear x 2.72:1 transfer case x 3.73:1 differential ratio = 22,459 lb.-ft. @ axle

So you saying the 392 needs more torque right? SUPERCHARGER!!!!!

 

[AnnDee4444]

So you saying the 392 needs more torque right? SUPERCHARGER!!!!!

Probably not, I've never felt the 2.0 was lacking in torque off-road Yes of course it needs more torque. The Hellcat supercharger should be a dealer installed Mopar option.

 

[word302]

Actually it's slightly less than the theoretical maximum of a 2.0 Rubicon in 4-low.

2.0: 295 lb.-ft. x 4.71: first gear x 4:1 transfer case x 4.10:1 differential ratio = 22,787 lb.-ft. @ axle

392: 470 lb.-ft. x 4.71: first gear x 2.72:1 transfer case x 3.73:1 differential ratio = 22,459 lb.-ft. @ axle

Sure at WOT, but anyone wheeling the 392 like that is gonna grenade parts pretty damn quick. The low end torque of the 392 will perform exponentially better in real-world wheeling.

 

[AnnDee4444]

Sure at WOT, but anyone wheeling the 392 like that is gonna grenade parts pretty damn quick. The low end torque of the 392 will perform exponentially better in real-world wheeling.

FWIW: I've read that the 2.0 limits torque in 4-low. I suspect this is probably true for all engines.

 

[oceanblue2019]

Sure at WOT, but anyone wheeling the 392 like that is gonna grenade parts pretty damn quick. The low end torque of the 392 will perform exponentially better in real-world wheeling.

I've never felt the need for more torque. I've never not had enough torque available to do whatever stupidity I was trying to accomplish.

But your point is probably very true - the 392 should be much more progressive in how the torque comes in. This could be really helpful in certain situations where you want to tip in gently. That will probably keep the axles in one piece a bit longer too

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