Alright well me and my roommate are currently having a debate about gears and we arn't sure who is right. For our debate we went to randy's ring and pinion and picked out a set of yukon gears to replace stock gear sets. (this really isn't happening btw) but for the sake of the debate, we picked to go with the 3.55's gearset.


Chrysler 9.25 - 3.55 http://www.ringpinion.com/ProductDet...px?ProdID=5658
Dana 44 - 3.54 http://www.ringpinion.com/ProductDet...px?ProdID=3231

Notice the gear ratio differences. My roommate says they won't work because they need to be the exact same ratio. I see where he is comming from, but I think these would work fine in our trucks. Set us straight!

 

whats the debate over? interchangability? idk from hands on, but if the splines and the bolts line up idk why not, the gear set it the only other part that wouldn't mesh, but its made as a set so kinda throws that one out... minus clearances, again idk first hand. dana 44 is the front on the 1500 4x4 correct? dana 60 out back? anyone with a spare 60 lyin around with a trashloc w/ 3.92s ill glady take it off your hands (for a second gen mind ya, i dont wanna fab)

edit: my vocab fails me now but in the pics on the site the pinon gear on the 9.25 at the pinon to shank interface seems to have a *much* larger bearing race (thats the vocab fails part btw) than the D44. just an observation. didnt really get what the debate was..... debating lol. my bad if it just went over me like so many 737s

 

It will work just fine. Many vehicles came factory with slightly different gear ratios front to rear.

I've always been told they should just be within 2%.

 

The debate is whether they would work in unison with each other because one is 3.54, and the other is 3.55 and not whether they would fit in their differentials.

 

Thats what I thought, but you can't tell a mechanic otherwise (my roommate)

 

Some gear sets just aren't physically possible to get the same ratio as Ring/pinions of different sizes.
The best example is many old ford pickups came with 4.09s in one axle and 4.11s in the other.

Hell I've even ran 2 totally different ratios in my B2 between 2 separate gear swaps when I needed 4x4 for around the property, just make sure it's really slick, it is highly unrecommended though!

 

should be fine...in the 1500, you have a Dana 44 for the front axle and a chrysler 9.25" in the rear...i don't see the problem here...lol

 

Exactly what I was looking for, thanks.

 

the 3.54 vs 3.55 is as close as you can get with 2 different size rings and the math of the calculation. as far as the truck knows - its a close enough match.

you can't get absolutely perfect unless you have matching differentials such as a pair of d44's or a pair of d60's.

now if you put a 4.10 in one and a 3.55 in the other, you might as well just beat on the t-case with a sledge hammer. it'll accomplish about the same thing.

 

Many trucks over the years have come with differing ratios between the front and rear differentials. the big three as well as many other auto manufacturers have done this for many decades without an issue.