I know they've made these posts and I've read several and even tried searching the numbers shown. My questions are while the build numbers match why are there 2 different ones? And what do the jl7 and 46 stand for? I'm basically starting with an empty case. New carrier ring and pinion. Not much to go off of on the old one pictured.

 

the "U4K-063" is the matching serial numbers for the ring and pinion (a matched set). The 697-420 (with a simple google search) is a Dorman part number for a replacement ring and pinion. The other random numbers I'm sure are casting codes or other manufacturers markings. I don't see any markings indicating the gear ratio. Are you going back with just an open diff or replacing the limited slip ?

 

That makes sense. I mean that's pretty much what I knew. I was worried because the other numbers were off. And I was really hoping for a variance number. But I got a Dana trac lok carrier that's going in. And the 41x9 is your gear ratio. They're 4.56 gears.

 

very cool! what caused the failure of the trac loc looked to be crunched up?

 

This I did not know...... Never really looked or paid attention. Interesting.

 

So I am assuming that 41x9 really means 41 divided by 9 = 4.56 ? new to me also..... I have seen the ratio stamped on the ring gear before however.

 

yes its the formula for the ratio. And mines a 6 speed. She'll burn second and chirp third. But don't dump the clutch from a dead stop