2fun

I just bought a 2006 Dodge 2500 Cummins Diesel quad cab with a 6 speed manual tranny.

I looked and looked, but cannot find what my gear/axle ratio is.

Where would I look to find that info???

I believe there are a couple of options.... 4.1 and 3.73 ?????

Any help greatly appreciated.

CTD NUT

Yup, those are the ratio options for a 3rd gen.....

If you post in the 3rd gen engine and drivetrain section you will likely get more hits.....not being a 3rd gen junkie, I'm not not sure where the build sheet/sticker is located. FWIW, on a 2nd gen and depending on the year, it is on the under side of the hood near the latch or inside the glove box door.

danram11

Glove box door.

stock03

I thought that all Getrag 6-speeds have 3.73's from factory?

dodgezilla04

we've discovered that DC quit putting the option sticker in the glove box door.

BigBlueDodge

Yes, if its a 2006 with 6spd , then its a 3.73 rear end. The 4.10's are not available for a G56 truck.

Hounddog

STOCK03. The G56 is NOT A GETRAG.

2fun

So it has the 3.73???

That is the best combo for good gas mileage correct??

What is a "getrag"???? What is a G56???

Sorry, I am new to these terms LOL!
Thanks for the help!

stock03

I thought it was...then what's a G56?

Sailpipes

Both manual transmissions that are being used or have been used in Dodge Cummins trucks. The G56 is the current manual gearbox being used and, if I'm not mistaken, is a Chrysler product that has been used in Mercedes commercial duty trucks for several years.
The Getrag was used in the older Dodge Cummins trucks. Not sure if it was in First Gen or Second Gen.

Hercules130

Due to the G56'S lower overdrive, the 3.73 is the only option, it is effectivley like having the NV5600 with 4.10's

rockcrawler304

Getrag is a first gen 5 speed and not too strong from what I hear.
NV4500 is a second gen. 5 speed (replaced the get rag)
NV5600 is second and third gen. 6 speed
G56 is the newest third gen. 6 speed with a lower (higher numericly) overdrive ratio and also a lower first gear ratio (IIRC)

Hope this helps.

stock03

Very informative answer, rockcrawler304...I was always under the impression that Getrag and G56 were the same thing.

Thanks for the clarification

2fun

Excellent info! Thanks for posting that! I was getting lost with all the #'s jargon!! LOL!!

C Schomer

Too bad they had to use 3.73 only with the G56 just because of the OD. All the other gears will be higher overall ratio and farther apart instead of a lower granny and closer splits of a 4.10. Craig