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Old 02-19-2012, 09:39 AM   #1
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Just purchased 2006 Dodge Ram 2500 w/5.9 ISB 6 cyl Turbo Diesel

Hey Forum it has been awhile since I have posted in the forum. Hope all is well with the forum members.
I have a question: I just purchased a 2006 Dodge Ram 2500 Truck with a 5.9 24 valve ISB Cummins Turbo. Transmission is a 6 speed automatic.
My question is any of you using this particular engine/transmission pulling your rigs and if so how has it been going for you? What is your mpg? And do you feel the truck pulls well?
I am going to be installing the ISR Series Super Glide #2700 (15K) because my bed on the truck is a short bed and for ease of mind I would like this type of glide to alleviate any possible rig to truck encounters when backing up the 5th wheel. Would like your opinions on this super glide as well.
My engine has only 92 thousand on it, so there is much longevity left.
Just wanted to scout around the forum and get all your opinions and comments on my choices.
Thanks so much.
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Old 02-19-2012, 04:40 PM   #2
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Quote:
Originally Posted by first5thwheel View Post
I just purchased a 2006 Dodge Ram 2500 Truck with a 5.9 24 valve ISB Cummins Turbo. Transmission is a 6 speed automatic.
If you have a 6-speed automatic (68RFE), you have a 6.7L Cummins. The 5.9L Cummins was only offered with the 47RE and 48RE 4-speed automatics.

Rusty
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Old 02-19-2012, 04:44 PM   #3
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Something is not correct in your post. If you have a 2006, with a 5.9L engine than the auto is a 4 spd transmission model 48RE. The 68RFE 6 Spd auto is electronically controlled and is not compatible with the MY 2007 and earlier trucks built with the 5.9L engine. The 6 spd auto was first introduced in the MY 2007.5 trucks built after Jan 1 2007. That is if you have the stock automatic from Dodge.
Also what is the differential gearing and what size tires are on the truck? This information is required to provide all of the information you requested.
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Old 02-25-2012, 08:17 AM   #4
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Nope

Quote:
Originally Posted by RustyJC View Post
If you have a 6-speed automatic (68RFE), you have a 6.7L Cummins. The 5.9L Cummins was only offered with the 47RE and 48RE 4-speed automatics.

Rusty
No for sure it is the 5.9, so it has to be the 4 speed automatic.

Sorry my goof.

But the dealer told me the trannie was a 6-speed, so now I am going to do some research. I think the dealership must be in error.

Thanks you for pointing out my error. I appreciate it.
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Old 02-25-2012, 08:34 AM   #5
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6 speed vs 4 speed

Quote:
Originally Posted by jimcumminsw View Post
Something is not correct in your post. If you have a 2006, with a 5.9L engine than the auto is a 4 spd transmission model 48RE. The 68RFE 6 Spd auto is electronically controlled and is not compatible with the MY 2007 and earlier trucks built with the 5.9L engine. The 6 spd auto was first introduced in the MY 2007.5 trucks built after Jan 1 2007. That is if you have the stock automatic from Dodge.
Also what is the differential gearing and what size tires are on the truck? This information is required to provide all of the information you requested.
Jim W.
Yes I was corrected on my post. I still have to validate with the dealer but with the statistics both of you have given me it has got to be the 4 speed automatic.

The gear ratio for the 4 speed is:

1st 2.45:1
2nd 2.45:1
3rd 1:00:1
4th 0.69:1
Reverse 2.21:1

I am running currently for tires: BF Goodrich All-Terrain T/A's

LT265/70R17/E
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Old 02-25-2012, 08:50 AM   #6
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Quote:
Originally Posted by first5thwheel View Post
Yes I was corrected on my post. I still have to validate with the dealer but with the statistics both of you have given me it has got to be the 4 speed automatic.

The gear ratio for the 4 speed is:

1st 2.45:1
2nd 2.45:1
3rd 1:00:1
4th 0.69:1
Reverse 2.21:1

I am running currently for tires: BF Goodrich All-Terrain T/A's

LT265/70R17/E
Gear1234Final DriveRatio2.45:11.45:11:1.000.69:14.56:1
Gear1234Final DriveRatio2.45:11.45:11:1.000.69:14.56:1I think the differential gear ratio is 4.56 but I will have to crawl under the truck and look at the tab on the housing.
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Old 02-25-2012, 04:18 PM   #7
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Quote:
Originally Posted by first5thwheel View Post
Gear1234Final DriveRatio2.45:11.45:11:1.000.69:14.56:1
Gear1234Final DriveRatio2.45:11.45:11:1.000.69:14.56:1I think the differential gear ratio is 4.56 but I will have to crawl under the truck and look at the tab on the housing.
No, you do not have 4:56 differential gears.
Dodge/ Ram only installed 4:10 gears if special ordered, most dealers ordered 3:73 Differential gears.
Here is a PDF link to the Dodge Body builder’s site. This lists what engine, transmission and differentials plus towing weights, this is for the model 5.9L quad cab built in 2006.
http://www.rambodybuilder.com/2006/docs/dr/mlup.pdf
Jim W.
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Old 02-26-2012, 12:19 AM   #8
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I had the same truck, silver too, and yes it has a 4 spd and is a 5.9. Mine did have the 4.10's but 3.73's are a good towing gear set too. I towed a 12500 lb trailer all over and it handled fine. Never gave me any problems and the tranny held up fine, but then I do live in Texas and only see hills when we tow to Pa. Have since moved on to a dually and still wonder if I made a mistake with the difference in the gas mileage.....
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Old 02-26-2012, 07:20 PM   #9
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OH that is good to hear. Yes my ratio is 3.73. I am learning all these new spec's that I never had to deal with before. I have studied the specs on my truck and it is as the other folks have pointed out. It is a 4 speed automatic and the ratio is 3.73. I stand corrected and please forgive my ignorance on not knowing such things. At any rate it is good to know you pulled 12,500 with no issues. :O) Thanks
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Old 02-26-2012, 07:25 PM   #10
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Information you requested

Quote:
Originally Posted by jimcumminsw View Post
Something is not correct in your post. If you have a 2006, with a 5.9L engine than the auto is a 4 spd transmission model 48RE. The 68RFE 6 Spd auto is electronically controlled and is not compatible with the MY 2007 and earlier trucks built with the 5.9L engine. The 6 spd auto was first introduced in the MY 2007.5 trucks built after Jan 1 2007. That is if you have the stock automatic from Dodge.
Also what is the differential gearing and what size tires are on the truck? This information is required to provide all of the information you requested.
Jim W.
Hi Jim,
I stand corrected on all accounts. Forgive my ignorance on not knowing the specs of this truck. You would think I would have done my homework more thoroughly, but I am a newbie at this so what I have been able to find it is the truck is the 4 speed automatic and the tires are LT265/70R173 and the rear ratio is 3.73. Will this information help you answer my question correctly? Let me know thanks.
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Old 02-26-2012, 09:19 PM   #11
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Don't forget your '06 HPCR 5.9 Cummins has a 7500/15000 mile oil change schedule. I use the 15000 schedule more now as my runs are local now.
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Old 02-26-2012, 10:09 PM   #12
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Thank you for the reminder. :O)
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Old 03-03-2012, 07:46 AM   #13
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06 hpcr

You got a great truck there. The 5.9 is a well tested, reliable power plant. The injectors cycle 3 times / event so make sure you are religious about fuel filter changes. Make sure you use the 5 micron fuel filter. Fleetguard filters are excellent and I believe they are owned by Cummins. The first thing you need is gauges. You will be working your engine hard and you need to know what's going on. I have a 5.9 with an auto like you. I have a pyrometer (exhaust gas temp), boost and auto tranny temp gauge. The pyrometer keeps an eye on temp - lets me know when to take my foot out of it on long climbs. I keep it less than 12000 at all times. The boost gauge also tells you how hard your truck is working; more boost = more fuel consumption. Tranny temp is self explanatory. If my transmission temp > 250, the transmission fluid life expectancy drops considerably. Amsoil in the differentials and transfer case, Napa AT+4 is the cheapest I've found. Dealer has the best price on tranny filter. Remember the drivetrain service interval is 30,000 miles. You might consider a BD exhaust brake, as they will work well with your engine / transmission combination. I haven't taken the plunge on this yet, but I'm considering it.

Geno's garage is an outstanding source for gauges (and other parts too). I use my local Kenworth dealership for Fleetgaurd filters, fuel filters from Grainger. Turbodieselregister.com is a great site for all things Cummins.

I generally get 10 - 11 mpg while towing a 12,000 # fiver; 17 mpg or so around town unloaded. Your design service life for that Cummins is > 400,000 miles; enjoy it!
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Old 03-03-2012, 11:04 PM   #14
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I have a 2001 dodge 5.9 auto 3.73 I agree with the boost and temp guage. My rig will heat tranny if I pull hard in second. GCW 22,000 lb, Going into 1st limits speed to about 20mph but nothing heats. This advise is for serious grades like Thompson pass out of Valdez 16 miles of 12% grade as I recall. Also Baldwin filters are about the best quality around. Just not the easiest to find.
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