Milo902
Adventurer
Well I pulled the carrier back out last night to verify the brand of R&P. The Ring gear only has some numbers stamped on it (373, 3CAA, & one other code), but the pinion has FOMOCO, 373, & 3CAA. This tells me I have an OE Ford matched 3.73 R&P as expected.
The old pinion bearing appears to be much thicker than the replacement though, accounting for my shallow pinion depth. There aren't any markings on the old bearing for identification, but the old race is a Timken and when I look up I get an 08-10 pinion bearing race, also correct as expected. The replacement pinion bearing supplied in the kit is visually thinner (probably about 100 thousands or so), and a slightly different design (many smaller bearing rollers, original is fewer larger bearing rollers). It is a Timken also, and the part number checks out as the correct replacement bearing (checked via Randy's R&P, Yukon gear install kit, and any other websites I could find). I will get a picture of the differences tonight for reference.
I'm a bit baffled at this point, being an OE R&P, it would have to be a 10.5" ring as I don't believe Ford offered 3.73 back in the 10.25 days. Also w/ all the other part numbers checking out, I can't figure out why I'm having pinion depth issues. Any insight from those with more differential experience on here?
In the meantime, I'm continuing w/ the rest of the axle modifications & maintenance.
The old pinion bearing appears to be much thicker than the replacement though, accounting for my shallow pinion depth. There aren't any markings on the old bearing for identification, but the old race is a Timken and when I look up I get an 08-10 pinion bearing race, also correct as expected. The replacement pinion bearing supplied in the kit is visually thinner (probably about 100 thousands or so), and a slightly different design (many smaller bearing rollers, original is fewer larger bearing rollers). It is a Timken also, and the part number checks out as the correct replacement bearing (checked via Randy's R&P, Yukon gear install kit, and any other websites I could find). I will get a picture of the differences tonight for reference.
I'm a bit baffled at this point, being an OE R&P, it would have to be a 10.5" ring as I don't believe Ford offered 3.73 back in the 10.25 days. Also w/ all the other part numbers checking out, I can't figure out why I'm having pinion depth issues. Any insight from those with more differential experience on here?
In the meantime, I'm continuing w/ the rest of the axle modifications & maintenance.