Dana 44 front 4.09/Dana 60 rear 4.10???

[Grieby54]

Ok, please tell me if all of this is right. I'm looking for some lower gears for my truck, so I'm going to buy ring and pinion and carrier from a Dana 44 front end with 4.09 ratio, and the ring and pinion for a Dana 60 rear with 4.10 ratio. The guy with the 4.09 front is telling me that he was running 4.09 front and 4.10 rear before he took it out and it's a thing that chevy does stock... I'm just confirming that this is true.

Also, he says that I need the carrier he has for the new 44 gears for 4.09 and higher but I won't need a new carrier for the new 60 gears unless I got 4.56 or higher... and I'm getting 4.10 gears. Is this correct as well?

 

[az-k5]

D60's use two carriers one for 4.10 and higher (numerically lower) and another for 4.56 and lower (numerically higher).

D44's use two carriers as well. I don't know the exact cut split but I think it is 3.73???

As for the 4.09 vs 4.10, just run it. Some auto makers did this to make the front end pull when turning. I ran it for years (stock matching 3/4 ton gear) and have no problems to date.

 

[JIMs70K25]

The only vehicle/axle combo I've seen that had matching front and rear gears was an old (76) scout II I had and the gears were 3.50s front and rear, dana44s. (I'm sure there's others)
As for GM it seems they are all off by 0.01 (or less than 0.2%) 4.09-4.10, 4.56-4.57, 5.13-5.14, 3.07-3.08. That's less than the difference when running old(worn) tires up front and new tires in the rear.

 

[JK5]

The 409 front/410 rear is a good combo!!!!
The front will pull more helping climbing offroad.
The difference is so small...it won't be noticed on pavement.

I had 409 rear/410 front in my rig...ran'm for years...nothing to worry about.

YES...You need the larger carrier for the front not for the rear.

 

[6.2Blazer]

The difference between 4.09 and 4.10 gears is 0.24%.........there's probably more manufacturing tolerance between a set of tires than that.

The reason it's different is because different axle designs require a different combination of ring and pinion teeth to get close to the desired ratio, and sometimes it's just not possible to get an exact match, but the difference is so small it just doesn't matter. I really don't believe there was any intent on trying to make the fronts spin faster when the gear sets were designed.

 

[mudslinger99]

I thought that you were suppose to have the front gears 1 point lower number wise so that the rear end didn't push the front end..

 

[JK5]

The difference between 4.09 and 4.10 gears is 0.24%.........there's probably more manufacturing tolerance between a set of tires than that.

True...especially 42's...
But I wonder what .24% does when adding some serious rpm to the mix...
I've known a couple guys with rigs set-up that way...and swear there's a difference.

On my rig...the front driveshaft would vibrate...the lockout hubs would wobble inside the hubs when I touched dry pavement in 4wd. with 35"s.

 

[6.2Blazer]

Here's another way to look at it.

The difference between 4.09 and 4.10 gears is the same as the difference between having 42.0" tires on the front and 41.9" tires on the rear. By measuring my friends new 42" TSL's there more height difference between each of the 5 tires than that. Different air pressures or tire wear between front and back could also easily contribute more of a difference.