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Old 01-20-2016, 05:17 PM   #1
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How do I determine rear diff ratio on Ram?

I found a really good deal on a 2011 2500 Ram with a 5.7L gas Hemi but I can not tell what gear ratio of the rear differential. I have looked at the actual rear end and looked inside the doors but can not find any data. I did write down the VIN#

Anyone know? Do I need to call someone?
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Old 01-20-2016, 05:23 PM   #2
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There is something at Dodge RAM VIN Decoder - Lookup and check Dodge RAM VIN number and get options and specs for free. Search Dodge RAM history, price and car loans.

I Googled 'decode ram vin' to find it. Hope it helps.
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Old 01-20-2016, 05:32 PM   #3
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I called ram with my vin number, and talked towing numbers before we bought our htt. It was a great conversation, learned a lot.
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Old 01-20-2016, 05:34 PM   #4
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Quote:
Originally Posted by oldmanAZ View Post
Thanks.

3.73 rear axle ratio. Damn. 9300lbs Max. Trailer

I was hoping for the 4.10 12,300lbs Max. Trailer
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2016 Jayco Eagle 330RSTS = "Madame Maxime"
Maxxis M8008 E rated Tires and 16" Wheel Upgrade
Dual A/C 15K BTU, 14K Equalizer WD hitch with SC
King Bed with Java Interior, (2X) Yamaha EF2000isV2
2012 Ram 4500, 6.7L Cummins Turbo Diesel, MegaCab = "Hagrid"
8'x12' BMCM Stake Bed, Cabin Chassis, 2WD
360 degree Virtual Tour
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Old 01-20-2016, 05:41 PM   #5
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Originally Posted by Fairenatic View Post
Thanks.

3.73 rear axle ratio. Damn. 9300lbs Max. Trailer

I was hoping for the 4.10 12,300lbs Max. Trailer

If it's the right truck, you could always throw another thousand at it and change the ring and pinion.
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Old 01-20-2016, 05:54 PM   #6
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If it's the right truck, you could always throw another thousand at it and change the ring and pinion.
I was just looking for one.

To be honest, unless the carrier, ring and pinion are installed new, I have had better luck just swapping the whole rear end, axles and all.

It is a pain in the ass to get the proper lash on a used rear end and I am getting to old to be jockying a diff around on a truck.

I will do some searching and see if it makes sense financially and what is the best route to take.
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2016 Jayco Eagle 330RSTS = "Madame Maxime"
Maxxis M8008 E rated Tires and 16" Wheel Upgrade
Dual A/C 15K BTU, 14K Equalizer WD hitch with SC
King Bed with Java Interior, (2X) Yamaha EF2000isV2
2012 Ram 4500, 6.7L Cummins Turbo Diesel, MegaCab = "Hagrid"
8'x12' BMCM Stake Bed, Cabin Chassis, 2WD
360 degree Virtual Tour
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Old 01-20-2016, 08:40 PM   #7
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Is the plan to use the 2500 series gasser to pull the camper, and is that the reason for the gear change?
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Old 01-20-2016, 08:41 PM   #8
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Is the plan to use the 2500 series gasser to pull the camper, and is that the reason for the gear change?
Yes. I wanted to have a plan B.
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2016 Jayco Eagle 330RSTS = "Madame Maxime"
Maxxis M8008 E rated Tires and 16" Wheel Upgrade
Dual A/C 15K BTU, 14K Equalizer WD hitch with SC
King Bed with Java Interior, (2X) Yamaha EF2000isV2
2012 Ram 4500, 6.7L Cummins Turbo Diesel, MegaCab = "Hagrid"
8'x12' BMCM Stake Bed, Cabin Chassis, 2WD
360 degree Virtual Tour
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Old 01-20-2016, 09:00 PM   #9
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In case the 4500 series breaks? Night and day difference between the two, the 2500 is pretty close on gvw. I guess everybody needs or has a back up plan.
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Old 01-20-2016, 09:01 PM   #10
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Just for future reference, most trucks (I know Dodges do), have a sticker inside the Glove box which had the rear differential ratio.
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