How do I??

I think, but not sure, you should have a 35. But, look at the rear of the housing. If you have a plastic fill plug with a dana emblem on it, you have a 35 if not then I guess thge 8.25
 
chy825.jpg

Chrysler 8.25
Ring Gear Diameter: 8.25"
Ring Gear Bolts: (10) 3/8" x 24 LH
Cover Bolts: 10
Yoke / Pinion Spline: 1.626"/27
1972-2000 1/2 Ton 2wd & 4wd Rear
Some Jeep Cherokees and Dodge Dakota / Durango
d35.jpg

Model 35
Details:
Ring Gear Diameter: 7.562"
Ring Gear Bolts: (8) 3/8" x 24 RH
Cover Bolts: 10
Yoke / Pinion Spline Count: 1.375" / 26
1984 - Up Jeep Cherokee, Comanche
1987 - Up Wrangler
 
also remember that in some select years / package configurations (towing package). . .had D44 rears. . .
 
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