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2nd Gen Durango 2004 - 2009

durango rear axle swap

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  #1  
Old 10-26-2011, 11:32 PM
BradLawrence BradLawrence is offline
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Default durango rear axle swap

I was wondering if the durango used a 3.92 gear ratio in a 9.25 inch rear. I need one for my ram 1500 but all the 3.92 ratios rears i have found in junk yards are 8.50 inch rears.
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Old 10-27-2011, 12:24 AM
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What year is the durango and the year of the ram truck.
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Old 10-27-2011, 01:44 AM
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My SLT+ has a 3.92 gear ratio in a 9.25 inch rear.

While there was no rhyme nor reason for which got 3.92 verses 3.55 and/or 9.25 verses 8.50, they did come both ways.

Generally the pair you are looking for was in the Durangos that came with the factory towing options. Look for a hitch as you cruise the junk yards.

HTH,

IndyDurango
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Old 10-27-2011, 08:38 PM
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Quote:
Originally Posted by BradLawrence View Post
I was wondering if the durango used a 3.92 gear ratio in a 9.25 inch rear. I need one for my ram 1500 but all the 3.92 ratios rears i have found in junk yards are 8.50 inch rears.
How sure are you that your Ram 1500 came with a 8.5 rear? Is it a bare bones 2WD?

Every Ram 1500 I've seen from 1994-2008 have had a 9.25 rear end.
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Old 10-28-2011, 10:35 PM
n8ech n8ech is offline
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Brad:

To add to what Indy has said, I think you will find that the Gen 1 Part time 4x4 Durangos had the 9.25 inch rearend along with the 4x2 models.

The AWD models had the smaller 8.25 inch unit. This also goes for the Gen 2 models.

Again, the Gen 2 4x2 models also had the 9.25 I think.

As far as the ratio goes, the 3.92 gearset seems to have been put into 33% of the D's while the standard 3.55 was at 66%.

This will explain why the 3.92 is a bit harder to come across.

Don
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Old 10-28-2011, 11:07 PM
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My 3.92 gear ratio in a 9.25 inch rear is AWD... or back in 2000 they called it "full time 4x4."

As I mentioned, there is no real rhyme or reason, just tendencies.
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  #7  
Old 10-30-2011, 07:45 PM
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Indy:

Thanks for the reminder that the R/T package which was AWD as standard came with the 9.25 gear.

I do recall seeing several non R/T Gen 1's with the AWD T case that had the 8.25 rear gear.

The supposition that more than one D owner has come to is that they had the smaller rear gear in D's with the AWD since the rear end would never see 100% of the engine power due to the transfer case being fixed at 58 rear and 42 front.

This would also explain why the 4/2 Durangos got the bigger 9.25 unit.

All of the AWD Gen 2 D's had the 8.25 gear as far as I have seen.

Don
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Old 01-24-2012, 02:05 PM
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I've been doing a lot of research on swapping my 8.25" 3.55 rear end and front end with 3.92 gear ratio for towing with my 2005 Durango. I've located a limited slip differential 9.25" for $700 and a front carrier assembly for $400 in a salvage yard. They are harder to find but available. My plan is to have the rear axle assembly swapped and front carrier assembly swapped and then sell the old 3.55 parts on Ebay. Looks like everything will swap in without major modifications. Labor at a local 4x4 shop is $900. I looked at the possibility of doing it myself but I think for $900 I'm better off having the shop do it. The dealer will flash the computer to reflect the change for a little over $100. The alternative was to keep the 8.25" rear end and just have the ring and pinion swapped and new master bearing/seal kits installed. The 9.25" rear end is stronger with bigger bearings and axle shafts. The brakes are the same so looks like 9.25" for a little less money than swapping the ring and pinion is the way to go. I'll let you know how it works out.

With the 3.55 gears and 5.7L Hemi I'm rated at 7400 lbs towing. It goes to either 8900 or 8950 by going to 3.92 gears. If I could find a 4.11 set of gears I might be temped. However, with the front 8" reverse cut gears I would have to go to a 3rd party to get the 8" ring and pinion. I think I'd go with 3.92. If that's not enough I'll go to a Dodge 2500 with a Cummins Diesel and never have to worrry about it again,
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Old 01-27-2012, 06:09 PM
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Okay. I picked up a used 9.25" 3.92 rear differential assembly from a local salvage yard as well as a front carrier assembly (3.92) for $1000. A local 4 x 4 shop is going to install them for me for $830. I plan to sell my 3.55 rear axle assy and front carrier assembly when I'm satisfied that everything is working. They only had a traction control version of the rear so I guess I'll have traction control when I get done. It will be installed next week. The dealer has agreed to flash the computer for $48 to reflect the gear ratio change. The estimate for just changing the ring and pinion was $2200 parts and labor. I'd still have an 8.25" rear end. We'll find out if there are any surprises but look like it will cost me $1830 to make the swap winding up with a 9.25" vs 8.25" rear end, traction control, and 3.92 gears. I'm happy with that. I expect I'll probably be able to get $800 to $900 for my old parts (only 55K miles). I'll let you know how it works out.
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Old 01-28-2012, 10:33 PM
n8ech n8ech is offline
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Ledoyle:
Good luck with that project, and please do let us know how it works out.

Don
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Old 01-30-2012, 11:43 PM
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Quote:
Originally Posted by BradLawrence View Post
I was wondering if the durango used a 3.92 gear ratio in a 9.25 inch rear. I need one for my ram 1500 but all the 3.92 ratios rears i have found in junk yards are 8.50 inch rears.
Brad~ .. Thanks for posting this a thread .. I have a question maybe , with you're experience you , or someone here can answer..
I put a 2004 Hemi in my 02' Ram Quad cab.. It does fine , but the transmission shifts 7 times and At 60 mph I'm barely turning 1,500 RPM's .. If I'm in town , 35 mph My truck lugs and I have to take the Overdrive off..After reading this thread , It accured to me that it could be my rear end gearing..I looked in the glove box and the tag says I have a 3.55 Gear..The truck came with a 4.7 and has the tow package and big springs , shocks etc.....
Does any one have any suggestions or know how I might get this truck to act normal ??
Thanks...
George..
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  #12  
Old 01-31-2012, 12:42 PM
ledoyle ledoyle is offline
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George, after I do my 3.92 upgrade I'm going to have the computer flashed by the dealer to reflect the new gear ratio after upgrading from 3.55. You might talk to a dealer service advisor. Mine agreed to flash the computer for $48 (about 30 minutes work). Perhaps you need to have your computer reloaded. It sounds like it is having a somewhat irrational response to your engine change. The other alternative would be to put a computer chip in that would coast anywhere from $50 to $350 depending upon which one you choose. This permits you set shift points at your desired levels. Larry
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Old 01-31-2012, 02:18 PM
HemiDak-Quad HemiDak-Quad is offline
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I've thought about that. The Transmission shift point option on the Super chips usually cost a little more..$45.00 I think , but it's worth it..When I get the money , I'll buy one and post the results..
Thanks ....
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Old 01-31-2012, 05:41 PM
ledoyle ledoyle is offline
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Update on my rear axle swap 3.55 to 3.92 and 8.25" to 9.25". The rear axle assembly that I received had traction control where my old one did not. Thus the speed sensors are on the end of the axles instead of on the 3rd member. With there being two sensors instead of one, the connection will not work. My salvage yard is locating a 9.25" 3.92 ratio rear axle assembly without traction control (which I really didn't want anyway). It will cost me $200 more to make the swap but then everything should just go in like it was originally planned. This is the wonderful part of working with trucks! Oh, well. I should have the parts in a few days and we'll try again.
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Old 02-04-2012, 10:26 PM
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Ledoyle:

Thanks for the update!

Brad:
If your truck originally had a 4.7L engine, then you have the 545RFE trans which is a 5 speed.
The prior version of that was the 45RFE which had 4 speeds.
I am not sure that you can have 7 or even 6 speeds there.

Are your tires OEM or bigger? Larger tires would give you an effectively taller gear ratio which would result in the lower rpms and lugging you are seeing.

I have the oem 245/70/17 tires on my D, and I see around 2K at 70 mph.

Don
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Last edited by n8ech; 02-15-2012 at 09:54 PM..
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  #16  
Old 02-07-2012, 05:09 PM
ledoyle ledoyle is offline
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Default 2005 Durango Rear Axle Swap

Update on my rear axle swap on my 2005 Durango. I have had to abandon going to the 9.25" rear axle. I ran into a problem that no one seemed to be able to solve. That is on my 8.25" Rear Axle the speed sensor is on the top of the differential. I had a salvage yard get two different 2004 Differentials from Durangos. Neither had the speed sensor on the top. The local Dodge dealer tells me that their pictures show two different 9.25" Speed Sensor (TC or none). Since my truck has been in the shop for over a week and I can't seem to find anyone who can tell me what the solution is I have decided to keep the 8.25" rear end and have a new ring and pinion installed at 3.92 ratio. The front carrier assembly has already been installed and looks like it works. I am interest if anyone has run into this. Was there a difference between the 2005 and 2004? Thanks, Larry
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Old 02-15-2012, 09:59 PM
n8ech n8ech is offline
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Larry:
I think you will be ok with the 8.25 inch unit. I also believe that the 04 and 05 years were the same as far as the axle assemblies went.

I am pretty sure the only way you could get a 9.25 inch rear end from the factory in a Gen 2 was to order a 4x2.

While I realize that places like Florida and California can get by without 4x4 unless the owners are off roaders, here in Ohio I think it silly to have a 4x2 truck or SUV.

Don
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Old 02-16-2012, 10:25 AM
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Don, I'm sure you and others may think me crazy or obsessed or both but after accepting that I couldn't get the 9.25" rear end and that I would resort to 8.25" upgrade to 3.92 I found another source for the 9.25". Several people told me that if I could get to the 9.25" the bearings, axle shafts, housing are all heavier duty and that it would be worthwhile if I could get there.

The rear end is supposed to be delivered today. I'm keeping my fingers crossed that it has the speed sensor holes on the top of the 3rd member. The traction control differentials to not have the speed sensor on the top of the housing, there are two and they are on the backing plates for each wheel. There is a different wiring harness to get out to the wheels also. More updates later in the day if everything goes okay so that someone else can avoid my frustration in making the swap. Thanks, Larry
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Old 02-19-2012, 03:35 AM
ledoyle ledoyle is offline
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Well, I kinda failed to locate a 9.25" 3.92 rear axle assembly for my 2005 Dodge Durango. After getting my third assembly that was incorrect I had my 4X4 shop install the 3.92 ring and pinion in my 8.25" differential. My truck sat at the shop for nearly three weeks while I tried to make this work. I tried locally in Denver and at a nationwide shipper and received the wrong parts each time. I'm frustrated but I'm done messing with the upgrade. Bullhide 4X4 in Fort Collins, CO was great and really worked with me to install my front carrier assembly that I bought in Denver and finally to install the ring and pinion along with the Master Bearing Kit for my "D".

I think given enough time and patience I eventually could have found the right parts but it was getting so frustrating that I finally called it.

I will tell you that there is a good difference in the responsiveness of the truck from a dead stop. If you get on it it goes without delay. Since I stayed with the 8.25" diff we reused the tone gear from the existing diff. Therefore, there was no computer flashing required as I would have had to do with the 9.25" change. My Dodge Service guys tell me that with the load I'm carrying (7400 lbs loaded) that I shouldn't have any problems with the 8.25". I have pulled this trailer about 3000 miles with the 3.55 gears and when we looked at the ring and pinion and bearings on the 8.25" there was no signs of wear or damage with 55K+ miles on the vehicle. Larry
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Old 02-22-2012, 10:05 PM
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Ledoyle:

Glad that you finally got some resolution on this event though it was not what you set out to do.

I think the 8.25 will do the job for you. As you found out though, looking for a D with the 3.92 gears is a bit of a challenge.

The surveys I have seen show that the 3.55 is the gear of choice on 66% of them.
It does not help that unlike Ford and GM, Dodge does not include the shorter gear as part of their tow package.

Both my 01 and 04 have the TP, and neither have the 3.92s.

When I was shopping for my second D, I tried to shoot for the shorter gear, but ended up giving in since I do not tow much and knew that the 3.55 would be fine.

Don
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Old 02-22-2012, 10:05 PM
 
 
 
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