Different Gear?

[Garrett Ellison]

I'll say it's 2.7 something or the other, 1-3/8x2 or 1.375x2=2.75, but online gear calculator showing 2.45 with a 26-1/2 inch tire and 2100 rpm. I may have to concur with 2.45, as I am 2250 at 60 Miles per hour with 25-1/2 inch tire with a 2.76 gear. I however, hope it is not 2.45, as I hate when someone has to change a whole axle to gain a better option for ring and pinion choices. I cannot find the thread on 8-1/4s, but I believe the high ratio housings had a different casting number. Best check that first.

 

[DusterDaddy]

Here is the thread. Pretty confusing

The 8 1/4 thread

 

[DusterDaddy]

I have a member wanting to sell me this suregrip. He says it’s for 271 gears and lower (higher numerically)
I’m going to see if I can find part numbers

[WANTED] - 8-1/4 sure grip

 

[DusterDaddy]

I have a member wanting to sell me this suregrip. He says it’s for 271 gears and lower (higher numerically)
I’m going to see if I can find part numbers

[WANTED] - 8-1/4 sure grip

I can’t be sure but I think this part number is for 271 and higher gears.
Gunna call Doctor Diff in the morning.

 

[DusterDaddy]

Mopar part: 18-05-039-903
What’s the best way to verify this sure grip is correct for 3.55 gear set?