Did a gear swap on an '05 Dak 4wd from 3.92 to 4.10.

Installer was 4WheelParts. They use G2 brand gears.

The front worked fine, no noise etc.

BUT THE REAR HAS BEEN A HUGE DISAPPOINTMENT

Loud whine from 50mph through 75mph on first set.

Worse whine on second set.

Called G2 corporate and they admitted that their gears whine on the 9.25 application.

Called several Yukon brand dealers and they all admitted that their gears whine on the 9.25 application also.

Did extensive research and discovered that Dodge DOES have OEM 4.10 gears for the 9.25 differential.

Ordered them today. Part # 5015371AD. $778 with tax and shipping.

https://www.dodgepartsonline.net/dod...ota-parts.html

Your question is "Why spend all that money for such a small ratio change?"

Answer: I live in an area of hilly terrain and I tow trailers frequently. (1500lb to 6000lb). Believe me... the 4.10 ratio is perfect. In all speed ranges the tranny remains in one higher gear than with the 3.92.

Whether towing or not towing in hilly terrain, my mpg is about 10% better with the 4.10.

Long distance, towing a 4500lb travel trailer at 60-65mph with no wind I'm averaging 12.3 mpg with the 4.10 vs 10.1mpg with the 3.92. Driveability is much improved due to tranny staying in 5th overdrive on moderate grades and in 4th on long steep grades.

Note:I do NOT use the tow mode because it has a tendency to downshift to 3rd vs. 4th on long steep grades.Exception is with trailer weights above 4300lb where the tow mode seems to help.

The bad news: On long distance flat terrain (not towing) at 70mph my mpg is about 5% worse than with the 3.92.

 

I just did a search on your P/N, it comes up with gearing for a Ram 1500. I take it the 9.25 diff is the same regardless of the application? Also, how did you track that down and how do I go about finding the gears for the front?

 

Did you try to use a tuner to adjust shift points before the gear swap?

 

I'll take your 3.92 gears off of you if you are looking to sell them. Provided they fit the 2009 Daks.

 

i was thinking the same thing q-tip but you beat me to it

 

Us Albertans have always been quicker than your Easterners.

 

I have MOPAR 4.10 with Richmond master install kit and they are smooth and powerfull.

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thanks blown and qtip dont get ahead of your self now lol

 

I really wonder if it is worth it. Going from 3.92 to 4.10 on a everyday vehicle....Is it that big of a difference, for us N/A V8's?

 

IMHO, I wouldn't spent the money to only go from 3.92 to 4.10, not that big a change. 3.92 to 4.56 would be alot more noticable..