Is it Possible to swap out a 5.4. ring and pinion for a 4.10 (1935 1/12ton dually)

[MoritzFlathead1935]

While I am researching this transmission combination (Warner T-9 1L, connected to a Warner Muncie L1-1gearbox)  I am wondering if it is possible to rearrange the differential gears? The truck is a 1935 Dodge Brothers 1 1/2 ton dually. Really don't want to change out the differential for a different one and then have to get adapters so I can keep the stalk rims. (Already powder coated).

After spinning the rear tires I calculated the differential gears are 5.4.

Would like to go up to at least 4.10 

I have read of guys swapping out the same vintage gears if they have the right combo to fit in the housing.

Any guidance on this?

Are there swappable parts out there? 

[wayfarer]

...surprised to find this on page 2 w/o any comments...where are the big-truck guys?

[ggdad1951]

Sorry no help from me...all I can say is the gears have to mesh right. If they don't bad things will happen.

[Jeff Balazs]

It doesn't seem to me that this kind of swap is a very likely option. At least not that big of a jump. You might find something slightly taller but I kind of doubt you would be able to go from 5.4 up to 4.1 in this housing. Perhaps someone here has a manual which shows the options available at the time?

 

Jeff

[JBNeal]

My 2¢: changing out ratios is an option only when the gearsets are the same physical size. This means that not only does the ring gear need to fit on the carrier, but the pinions have to be interchangeable. The 3.55 that I put in my Dakota longbed 15 years ago was much smaller than the 3.55 Sure-Grip that I put in my D-250 CTD a few years later. This is a precision assembly that transmits power, so ya want to do way better than "close enough".

[Jeff Balazs]

Another thought. Have you tried talking with a shop that rebuilds rear axles. Someone who works on these daily might have some idea or a suggestion as to what might work as a swap. Worth a try. I totally get what you are trying to do....but I doubt it will be an easy gear swap.

 

Jeff

[Plymouthy Adams]

when looking up info in the interchange book long back..there are two different size housing referenced in the note and the fact that these issues have to be addressed when swapping gear ratios..

[wayfarer]

I thought that these had a drop-out carrier...? 

[Frank Elder]

Try the rock crawlers or the monster truck forums??? Some of them even use those big old rockwell units.......

[MoritzFlathead1935]

Thanks all for the impute! I'll keep checking around and let you know what I come up with for a final option.