Pinion flange bolt pattern (1 Viewer)

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Anybody know the rear pinion flange bolt patter for a 97? I measured 3.55 inches (90mm) square but that is way too big based on wha i can find online. The front seems to be right at 60mm square. Any help?
 
It looks like 2.55 inches, not 3.55.
Quick check on a spare driveshaft this morning. Kind of an eyeball caliper job but really close.
20170923_072537.jpg
20170923_072522.jpg
 
My guess is that my eyeball job is off a smidge making the centers 65mm. I can't imagine the dimension going into decimal places from there. It is a square pattern too, which you probably already know. Hope it helps.
 
Edge to edge distance will be the same as ctr to ctr..... just sayin, a lot easier to eyeball that way

Or use Kurts cheat sheet ;)
66x66x11

Cruiser Outfitters

Which doesnt quite cover 80s but his catalogue has some clues
IMG_3859.PNG
 

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