After a further Google search I found the ring and pinion number listed on Weller’s Truck website. They have a great catalog online... http://www.wellertruck.com/lit/Weller_Diff_Catalog_2011.pdf
But for the ring gear I had, it was listed for an Eaton 19201 rear (and 19501 if its locked in low range...) The only difference here is that my carrier has 16 spine axles instead of 22. Weller did not have 5.43’s in their inventory but they were very helpful when I talked to them.
I did get several suggestions on locating gears. I called a few local places along with Pat at Demo’s but he only had 6.14’s. Then a guy on FB referred me to Tommy John’s Truck Parts in Wortsburo, NY . John didn’t have any gears but he referred me to A&A Truck Parts in Freehold, NJ and sure enough he had a set in an International pumpkin. For some reason International used 10 hole pumpkins instead of the 12 hole, but the gears are the same. So after a handful of conversations, I made a trip to Freehold which I was able to do during one of my New Brunswick trips for work. I did get some strange looks when I pulled in the yard with a rental car and popped the truck open :)
The first thing I noticed was that the companion flange (yoke) was different. It’s actually a Rockwell yoke for a wing bearing, 72N series. But after I removed the flange from pinion, I realized that the splined parts of the pinions were different diameters.
The inner and outer bearings were the same for both yokes and the shims and spacers were the same, but the original pinion was 10 spline with 1.750” major diameter while the new one was also 10 splines but with a 1.964” major diameter. So this added another level to my companion flange dilemma...
Before I realized there was a difference in the pinions, I figured I would re-use the companion flange from the 6.71 pinion. My original driveshaft used Spicer 1500 series U joints. These have been obsolete for some time but I was able to locate an NOS pair on eBay a number of years ago. On a side note, Neapco has started making these joints again. The Spicer number was 5-115X and the new Neapco number is 3-0055.
Then I considered using the Rockewell 72N flange. One of my International buddies (Kevin L) had a driveshaft I could use but that would mean I would have to have the driveshaft cut and have new yoke welded on, and then buy a new wing u joint. But before I went down that path, I figured I would try to locate a companion flange to match my Spicer 1500 joint. Besides, both u joints were new (well from 2008...) and the flange the u joint goes into was also new.
After searching online with no luck, I remember Jack Alt have given me a vintage Spicer book years ago. So I dug that out and was able to find a number that matched was I needed, Spicer #4-1-3841.
Although the flange was listed for a 1480 or 1550 joint, the dimensions matched my 1500 series flange, with a ground flange diameter of 2 5/8” and a length through the hole at 2 1/4". Of course this flange has been obsolete for some time, I after a quick Google search I found that Weller had one in stock in Grand Rapids Michigan. I called the next day and it was the last one they had, still covered in cosmoline and wrapped in wax paper. It cost a few bucks but was still cheaper than having the drive shaft cut...
And now I had a nice assortment of companion flanges... On a side note, the round flange was from the 257 rear. This took (8) 3/8” bolts and a Spicer 1610 series joint, Spicer number 5-279X.
More to follow...
"Leave no bolt unturned"