what gear ratio do I have?

2007 cummins 6.7 liter · 08-26-2008, 08:40 PM

I have a 2007.5 dodge ram 2500 6.7 liter cummins turbo diesel truck with a 6 speed auto. Totally stock. 2 wheel drive.
it runs 1700 rpm at 65 mph.
4:10 rear differential gears?

Last edited by 2007 cummins 6.7 liter : 08-26-2008 at 08:41 PM. Reason: wrong title

smkstk · 08-26-2008, 08:41 PM

i'd say 3.73 or higher like 3.43, something inbetween there.

__________________
Nothing yet, and probably nothing until next year, i feel so left out! Global climate change is natural phenomenon, exploited by the unscrupulous, for political and monetary gain.

2007 cummins 6.7 liter · 08-26-2008, 08:43 PM

I tried to build a truck on the dodge website to see what gears they would allow. The only one that it would allow for the diesel option was the 4.10 ratio.
What do you think?

***Hot Stuff*** · 08-26-2008, 08:45 PM

Should be a sticker in the glovebox that'll tell you what ratio it has.

But, it sounds like 3.73's. That's the standard for about 80% of these trucks.

__________________

'03 Black 2500 QC/LB 4x4, 6 speed, BHAF, black H2's, 35" BFG MT's, B&W turnover, Juice w/ Attitude, 5" str8 pipe, BD lift pump, spin on filters, traction bars

Adam---Proud member of the OHIO COAL ROLLERS

BCSCUMMINS · 08-26-2008, 08:48 PM

Does it not say in your glove box what gears you have? I think that it should have 3.73’s in it.

__________________
2001.5 Reg cab 3500 SO pumped HO, TST comp, smarty, Jr Adkins 240hp injectors, fully polished B1/B2 twins, O rings, studs, grid heater delete, polished ATS intake horn, ATS 3 piece manifold, snow performance water meth, SBC 3600 DD, traction bars, HD springs.

2007 cummins 6.7 liter · 08-26-2008, 08:54 PM

NO I checked it only has a sticker that warns you about the air bag. I couldn't find anything in the owners manual.

jmdaugherty84 · 08-26-2008, 08:56 PM

Take some chalk and mark the tire and mark the drive shaft. Park the truck on a level surface and put the truck in neutral. Have someone push the truck forward one tire revolution (use the mark on the tire to verify one revolution). At the same time, you can get down (lay on a creeper, be safe though) and count the number of driveshaft revolutions that occur with one revolution of the tire. You should be able to tell the difference between 4.10's and 3.73's.

**Jesparza300** · 08-26-2008, 08:56 PM

they are 3.73s that is what is in my 6.7

__________________
TEXAS COAL ROLLERS SOUTH VP
07.5 dodge ram 2500 4x4 6.7 diesel
68RFE 3.73 gears all stock for now

http://www.cumminsforum.com/forum/texas/

2007 cummins 6.7 liter · 08-26-2008, 08:58 PM

jesparza,
your truck turns 1700 rpms at 65mph?

**Jesparza300** · 08-26-2008, 09:00 PM

yea doing 70 am at like 1900 rpms

__________________
TEXAS COAL ROLLERS SOUTH VP
07.5 dodge ram 2500 4x4 6.7 diesel
68RFE 3.73 gears all stock for now

http://www.cumminsforum.com/forum/texas/

2007 cummins 6.7 liter · 08-26-2008, 09:01 PM

thats the same as mine.
Thanks guys for the help.

runninlean · 08-26-2008, 09:39 PM

3.73 in the autos and can get 4.10 in the stick.

__________________
(runninscared) 06Silver,sport,QC, 2500, 4x4, 48re Built By Relentless, 3.73, BDTD/CL Beta, Dr. P stage 3, 62/12, small shot, S&B intake, Quad BF, Relentless LP, Magnaflow,Dune Grappler's 285/55/R20, 652 rwhp and 1266 tq 7/23/08 12.476 @ 108.96 mph 10/10/08

08-26-2008, 08:40 PM	#1 (permalink)
2007 cummins 6.7 liter Cummins Fan Join Date: Jul 2008 Posts: 70 2007 cummins 6.7 liter's Truck Pics	what gear ratio do I have? I have a 2007.5 dodge ram 2500 6.7 liter cummins turbo diesel truck with a 6 speed auto. Totally stock. 2 wheel drive. it runs 1700 rpm at 65 mph. 4:10 rear differential gears? Last edited by 2007 cummins 6.7 liter : 08-26-2008 at 08:41 PM. Reason: wrong title

08-26-2008, 08:56 PM	#7 (permalink)
jmdaugherty84 Newbie Join Date: Aug 2008 Posts: 1 jmdaugherty84's Truck Pics	Mark the tire and drive shaft Take some chalk and mark the tire and mark the drive shaft. Park the truck on a level surface and put the truck in neutral. Have someone push the truck forward one tire revolution (use the mark on the tire to verify one revolution). At the same time, you can get down (lay on a creeper, be safe though) and count the number of driveshaft revolutions that occur with one revolution of the tire. You should be able to tell the difference between 4.10's and 3.73's.

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08-26-2008, 08:41 PM	#2 (permalink)
smkstk Diesel Head Join Date: Jan 2008 Location: Rapid City Michigan Posts: 1,613 smkstk's Truck Pics	i'd say 3.73 or higher like 3.43, something inbetween there. __________________ Nothing yet, and probably nothing until next year, i feel so left out! Global climate change is natural phenomenon, exploited by the unscrupulous, for political and monetary gain.

08-26-2008, 08:43 PM	#3 (permalink)
2007 cummins 6.7 liter Cummins Fan Join Date: Jul 2008 Posts: 70 2007 cummins 6.7 liter's Truck Pics	I tried to build a truck on the dodge website to see what gears they would allow. The only one that it would allow for the diesel option was the 4.10 ratio. What do you think?

08-26-2008, 08:45 PM	#4 (permalink)
*Hot Stuff* Smokin' Join Date: Dec 2007 Location: Republic, Ohio Posts: 2,543 Hot Stuff's Truck Pics	Should be a sticker in the glovebox that'll tell you what ratio it has. But, it sounds like 3.73's. That's the standard for about 80% of these trucks. __________________ '03 Black 2500 QC/LB 4x4, 6 speed, BHAF, black H2's, 35" BFG MT's, B&W turnover, Juice w/ Attitude, 5" str8 pipe, BD lift pump, spin on filters, traction bars Adam---Proud member of the OHIO COAL ROLLERS

08-26-2008, 08:48 PM	#5 (permalink)
BCSCUMMINS Cummins Fan Join Date: Aug 2008 Location: Elgin Tx Posts: 81 BCSCUMMINS's Truck Pics	Does it not say in your glove box what gears you have? I think that it should have 3.73’s in it. __________________ 2001.5 Reg cab 3500 SO pumped HO, TST comp, smarty, Jr Adkins 240hp injectors, fully polished B1/B2 twins, O rings, studs, grid heater delete, polished ATS intake horn, ATS 3 piece manifold, snow performance water meth, SBC 3600 DD, traction bars, HD springs.

08-26-2008, 08:54 PM	#6 (permalink)
2007 cummins 6.7 liter Cummins Fan Join Date: Jul 2008 Posts: 70 2007 cummins 6.7 liter's Truck Pics	NO I checked it only has a sticker that warns you about the air bag. I couldn't find anything in the owners manual.

08-26-2008, 08:56 PM	#8 (permalink)
Jesparza300 TEXAS SOUTH CHAPTER VP Join Date: Aug 2007 Location: san antonio Posts: 768 Jesparza300's Truck Pics	they are 3.73s that is what is in my 6.7 __________________ TEXAS COAL ROLLERS SOUTH VP 07.5 dodge ram 2500 4x4 6.7 diesel 68RFE 3.73 gears all stock for now http://www.cumminsforum.com/forum/texas/

08-26-2008, 08:58 PM	#9 (permalink)
2007 cummins 6.7 liter Cummins Fan Join Date: Jul 2008 Posts: 70 2007 cummins 6.7 liter's Truck Pics	jesparza, your truck turns 1700 rpms at 65mph?

08-26-2008, 09:00 PM	#10 (permalink)
Jesparza300 TEXAS SOUTH CHAPTER VP Join Date: Aug 2007 Location: san antonio Posts: 768 Jesparza300's Truck Pics	yea doing 70 am at like 1900 rpms __________________ TEXAS COAL ROLLERS SOUTH VP 07.5 dodge ram 2500 4x4 6.7 diesel 68RFE 3.73 gears all stock for now http://www.cumminsforum.com/forum/texas/

08-26-2008, 09:01 PM	#11 (permalink)
2007 cummins 6.7 liter Cummins Fan Join Date: Jul 2008 Posts: 70 2007 cummins 6.7 liter's Truck Pics	thats the same as mine. Thanks guys for the help.

08-26-2008, 09:39 PM	#12 (permalink)
runninlean Cummins Nut Join Date: May 2008 Location: Cypress, TX Posts: 302 runninlean's Truck Pics	3.73 in the autos and can get 4.10 in the stick. __________________ (runninscared) 06Silver,sport,QC, 2500, 4x4, 48re Built By Relentless, 3.73, BDTD/CL Beta, Dr. P stage 3, 62/12, small shot, S&B intake, Quad BF, Relentless LP, Magnaflow,Dune Grappler's 285/55/R20, 652 rwhp and 1266 tq 7/23/08 12.476 @ 108.96 mph 10/10/08