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  #21  
Old 06-12-2019, 08:53 PM
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I have a 19 Limited with 3.92 rear end and wouldn't change it for the world. Had a 12 with 3.21, a 13 with 3.92, and a 16 with 3.92 with 4 corner suspension. The 3.21 was ok but I can feel the difference on a 16 ft double axle motorcycle trailer. They both pulled the trailer fine but the 3.92 did it easier. It was like it wasn't there even on inclines. My 19 also has the 4 corner suspension and the 4x4 off road pkg. The self leveling helps.also. My son built a 19 Laramie Sport crew 4x4 with the off road pkg and the 4 corner with the 3.92 and pulls a trailer as well and wouldn't change to a lesser rear end. It's about choice and comfort zone. Go to the dealership and drive both with ur trailer and c which one works the best for you. I spent almost 30 yrs in dealerships and u can test drive it that way to c which is better before you buy. Go luck!!!
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  #22  
Old 06-12-2019, 09:10 PM
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I've driven pickups for near 30 years - gas, diesel, you name it. I've run rear ends as low as 3.07 and as high as 4.16. You are right that the powertrain combination should be taken into account prior to selection, including expected max tow loads and whether you tow over hills & mountains or mostly flat.

With your modest max tow load I'd say 3.21:1 rear end would be ok as long as you don't have substantial hills to regularly tow over. If you do, this combo will downshift the tranny a lot, maybe 2 gears down. I run a 6.4 HEMI in a 2500 crew cab. I tow 5,000+ loads a fair amount, including fairly steep hills in unglaciated landscape. For this reason I went with 3.92:1 and am satisfied. Downshifts uphill are 1 gear, so the engine doesn't turn into a screamer dropping 2 or 3 gears.
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Old 06-12-2019, 11:38 PM
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I have a 2019 With The 3:21 and I tow a 19 foot bass boat with it. IT Does A Good Job But if you tow A lot I would Recommend the 3:92 you won't Notice to much difference in MPG but it will do a lot better towing. I took what was on the dealers lot but if I had to order it I would go with the 3:92 in a heartbeat.
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  #24  
Old 06-13-2019, 08:38 AM
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You are fine with 3.21 rears. Have had both in rams. Towed same weights for long distances and the only difference is which gears you tow in, people get to worked up over this. The 8 speed trans is a great transmission and does fine,
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Old 06-13-2019, 03:25 PM
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I had a 09 TRX4 with 3.92s and it did great hauling loads. I towed an International Scout a few times. Recently traded that for a 2016 Laramie 4x4 with 3.21s, added 2.5" lift and 35s and towed a 31' travel trailer and the truck struggled and could barely get the truck moving. I'm not happy at all with the 3.21s, even with the truck unloaded it hunts for gears on hills at highway speeds, especially if I'm driving into the wind.

I will get 3.55s or 3.92s in my next truck unless I get a Power Wagon which comes with 4.10s
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  #26  
Old 06-13-2019, 06:18 PM
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My ‘05 Daytona had a 3.92, my ‘12 Big Horn had a 3.55, and my current ‘19 has a 3.92 with a LSD.

I couldn't feel much difference between the 3.55 and 3.92, but I don’t know about a 3.21 with a lot of towing.

I have a big 18’ airboat with all stainless rigging, a BB 454 and belt drive. I also have a 24’ pontoon boat.

I’m glad to have a 3.92.

Couldn’t the dealier change out the 3.21 to 3.92 gears for you?

The costs on my sheet were $95.00 for the 3.92, and $495.00 for the “Anti-Spin Rear Axle.”
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Last edited by Ric McC.; 06-13-2019 at 06:21 PM.
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  #27  
Old 06-14-2019, 10:52 AM
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Quote:
Originally Posted by SRW View Post
Recently traded that for a 2016 Laramie 4x4 with 3.21s, added 2.5" lift and 35s and towed a 31' travel trailer and the truck struggled and could barely get the truck moving. I'm not happy at all with the 3.21s, even with the truck unloaded it hunts for gears on hills at highway speeds, especially if I'm driving into the wind.
Nothing personal but you added 10" of circumfrence, not to mention all the weight of the additional wheel and tire size to add 3" of diameter to the overall size. If you bumped up to D or E rated tires that's even more weight (going from XL/C-rated to E-rated on my truck is 10+ lbs per tire, and that's if I stay with the same size of 32" diameter). Multiply that by 4 and your truck is going to struggle with stock gearing, especially 3.21s. Add a load and you're asking a lot from an otherwise stock truck, even a Hemi.
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  #28  
Old 06-14-2019, 11:03 AM
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If you plan to run a 2.5" lift and 35's, the 3.21 gears are the wrong choice. You can adjust the tire size so it shifts better but you're using tires that are 2x the weight of the stock as well as being 2" taller. 3.21 and 34's aren't bad but 35's are not ideal.
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  #29  
Old 06-14-2019, 11:16 AM
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If I was planning on upsizing my tires at all I would have gone with 3.92s.

The Rebel has 33" tires (compared to my 32") and IMO there's a reason that the Rebel only comes with 3.92 gears for the Hemi.
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  #30  
Old 06-14-2019, 04:02 PM
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Quote:
Originally Posted by Cattdaddy40 View Post
I have a 19 Limited with 3.92 rear end and wouldn't change it for the world. Had a 12 with 3.21, a 13 with 3.92, and a 16 with 3.92 with 4 corner suspension. The 3.21 was ok but I can feel the difference on a 16 ft double axle motorcycle trailer. They both pulled the trailer fine but the 3.92 did it easier. It was like it wasn't there even on inclines. My 19 also has the 4 corner suspension and the 4x4 off road pkg. The self leveling helps.also. My son built a 19 Laramie Sport crew 4x4 with the off road pkg and the 4 corner with the 3.92 and pulls a trailer as well and wouldn't change to a lesser rear end. It's about choice and comfort zone. Go to the dealership and drive both with ur trailer and c which one works the best for you. I spent almost 30 yrs in dealerships and u can test drive it that way to c which is better before you buy. Go luck!!!
Are you running the 22" wheels and if so what kind of highway mileage are you getting?
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