couple questions i should have asked before hand

here is the info i got when i bought it and some pictures. i guess my questions are what is the ring with the small teeth/gears and do you think this will fit in my rear end. I have a 1970 swinger 2 door hard top with a stock 8.25 rear out of a 1974 swinger 2 door hard top

Dodge Plymouth Mopar 8.25 8 1/4 Sure Grip Trac Lok Posi 3.55 Gears 27 spline


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Condition: Used
Brand: Dana/Spicer
Placement on Vehicle: Rear
Manufacturer Part Number: mopar chysler pickup sure grip lsd ram 10 bolt
Interchange Part Number: Limited slip locking differential dakota van car
Part Brand: OEM MOPAR
Other Part Number:355 Axle Differential Diff Track Lock Anti Spin

Dodge 8.25 sure grip / trac lok (posi) 27 spline unit with 3.55 (11-39) gears. Gears have a nice wear pattern and unit is nice and tight. Includes adjusters, races, c clips, abs reluctor ring and used bearings that could be used as is or replace to your liking. Should fit many different years and models with the 27 spline 8.25 rearend (1997 and older 10 bolt)


thanks in advance Don