Gearing for towing 3.73 or 4.10 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 46 (permalink) Old 04-10-2012, 02:16 PM Thread Starter
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Gearing for towing 3.73 or 4.10

Over the weekend I noticed the seal at the pinion on the rear differential started leaking figured if I'm going to have someone fix it or do it myself might as well change the gears now.

So which would be better in an 2002 2500 automatic transmission truck, 3.73 or 4.10 gearing for towing.

Thanks for your input.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #2 of 46 (permalink) Old 04-10-2012, 09:27 PM
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If you are running bigger tires, and tow heavy, then you want the 4.10s, 3.73 are great with standard size tires.
The Dodge automatic, is not a strong point.
You do not need to tear the diff apart to change the seal.

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post #3 of 46 (permalink) Old 04-11-2012, 02:25 PM Thread Starter
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I dont recall the tire size. I will be towing heavy eventually, this year or early next. Automatic will be upgraded.

I did not know that about the seal, then again I find these things out as I go.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #4 of 46 (permalink) Old 04-13-2012, 06:09 PM Thread Starter
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What about the preload on those bearings and isnt the crush sleeve a one shot deal?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #5 of 46 (permalink) Old 04-16-2012, 01:22 PM
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What gears do you have now?

I had 4.10s in my 97 (auto) and 99 (5spd) trucks. Never an issue with power. The 92 I had, has 3.54 gears and a 5spd with 35" rubber. No issues towing with it either. But, I generally tow in 4th on the 55mph roads. Tows great as well.

Never tore into a Dana so, can't help on that one.

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post #6 of 46 (permalink) Old 04-16-2012, 06:25 PM Thread Starter
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Right now 3.54 gears in the Dana 60.

Asked about the bearings and crush sleeve because the gear shop I called said that he wouldnt replace the pinion seal because the crush sleeve is a one shot deal and he would also replace the bearings in there, since anything less he said was half ***.

He said that the pinion seal bearings crush sleeve and labor would be around 400$ where as doing 4.10 gears in both axles would be ballpark 2k$.

I havent upgraded the transmission at all yet and am starting to think about maybe finding a donor 5 or 6spd trans.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #7 of 46 (permalink) Old 04-16-2012, 10:09 PM
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I have the 4:10 in my '03. Although it has plenty of power, the unloaded fuel milage, sucks big time. Unless you're gonna be loaded more than unloaded, I would stick with the 3:73. If I could find someone with 3:73 who wanted to swap for the 4:10, I'd do it in a heartbeat. Just my opinion.

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post #8 of 46 (permalink) Old 04-17-2012, 01:50 AM
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More than 7000 get 4.10 more than 12000 get 4.56.
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post #9 of 46 (permalink) Old 04-18-2012, 12:17 PM Thread Starter
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See I was wondering the same thing Firestorm, it would be like every other month or so that it would be over 7000.

Later, you cant tow more than 12K with the 94-02 dodges. Atleast the manual says 11,640. 4.56 would be quite the low range especially for something that wouldnt be hauling all the time.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #10 of 46 (permalink) Old 04-18-2012, 02:15 PM
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The owners manual is talking about combined vehicle weight (the truck its load and the trailer) I am saying if you are towing a 7000 lbs trailer you will need 4.10 or a 12000 lbs trailer you will need 4.56.

Just try towing with 3.55's and a stock automatic and you will see what I am talking about.
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