Dodge Cummins Diesel Forum banner
  • Hey everyone! Enter your ride HERE to be a part of this month's Ride of the Month Challenge!

1 - 16 of 16 Posts

·
Registered
Joined
·
199 Posts
Discussion Starter #1
I have herd of a guy around home putting 308 gears in his 94 or 95 2wd truck and is getting around 26- 28 mpg. Is this possible to do it in my truck (see sig). If so could i still pull my camper its a 34 footer and weight about 9500 lbs. If i could get it around 1400 RPM's at 70 MPH, it would be great.
 

·
Registered
Joined
·
199 Posts
Discussion Starter #2
bump..........
 

·
Registered
Joined
·
751 Posts
im sure it could be down and since you have the six speed you should have no trouble moving your trailer
 

·
Registered
Joined
·
199 Posts
Discussion Starter #4
Where would be the best place to find some gears?
 

·
Registered
Joined
·
3,263 Posts
For the AAM 11.5" the 3.42 is it. Add 285/75/17 with the 3.42 will get you to 3.17.

Personally I wouldn't try towing that low of a rpm. That's lugging and will increase fuel consumption. Best to keep the rpms around 1800-2000 for power and efficiency.

MikeyB
 

·
Registered
Joined
·
674 Posts
I have herd of a guy around home putting 308 gears in his 94 or 95 2wd truck and is getting around 26- 28 mpg. Is this possible to do it in my truck (see sig). If so could i still pull my camper its a 34 footer and weight about 9500 lbs. If i could get it around 1400 RPM's at 70 MPH, it would be great.
what gears do you have now? i switched from 4.10 to 3.73 and saw a 4-5mpg improvement to about 18mpg. with fuel the way it is now:CRY: i should have gone higher
 

·
Registered
Joined
·
58 Posts
I saw someone on Ebay selling a 3:08 rear axle for a first generation so they must be available Check with JT parts and accessories . they are a vendor here on the forum they got my 3:42s for me. They could probably tell you if they are available . 509-888-2953
 

·
Tech Specialist
Joined
·
1,493 Posts
First gen's are dana axles. 3rd gens are American Axle. Different company, different gearing options.
 

·
Registered
Joined
·
120 Posts
actually the first gen's have 3:07's not 3:08's
 

·
Registered
Joined
·
199 Posts
Discussion Starter #10
what gears do you have now? i switched from 4.10 to 3.73 and saw a 4-5mpg improvement to about 18mpg. with fuel the way it is now:CRY: i should have gone higher


I HAVE 3:73'S NOW
 

·
Registered
Joined
·
6 Posts
More gear ratio rambling

As far as I know (that ain't too far) the American Axle eleven and a half type axle now has three options of 41/10, 41/11, and 41/12 for ring and pinion. You do the math and round off and you get the 4.10, 3.73, and 3.42 that people usually quote. I just went from 3.73 to 3.42 in a 2007 2wd with a 6 speed and a 5.9 engine; not sure if it is going to save a bunch of fuel, but it sure is nice not looking for that 7th gear on the highway anymore.:thumbsup
 

·
Registered
Joined
·
6 Posts
Mungus what did that cost you, Im looking at doing that on mine to drop rpm
 

·
Registered
Joined
·
486 Posts
As far as I know (that ain't too far) the American Axle eleven and a half type axle now has three options of 41/10, 41/11, and 41/12 for ring and pinion. You do the math and round off and you get the 4.10, 3.73, and 3.42 that people usually quote. I just went from 3.73 to 3.42 in a 2007 2wd with a 6 speed and a 5.9 engine; not sure if it is going to save a bunch of fuel, but it sure is nice not looking for that 7th gear on the highway anymore.:thumbsup
Any before/after mpg results?
 

·
Registered
Joined
·
1,636 Posts
The 3.07 will only fit the first gen dodge housing.
 
1 - 16 of 16 Posts
Top