Bolt pattern question.

[340Dust-her]

I have a typical question which im sure is fairly simple to explain. To be honest i've never followed through because i was never a rim/wheel kinda guy. I've been working on engines ect, but never got around to backspacing/bolt pattern ect.

I understand what backspacing is, but how does one measure bolt pattern? I have a 1971 Duster with a rearend from a 1973 Duster. I'm not 100% sure if its a 7.25 or 8.25. It's def. not a 8 3/4. Any help or explanation would be appreciated. Thanks.

 

[demon seed]

Two more for ya https://www.rsracing.com/tech-wheel.html
and http://www.moparts.org/Tech/Archive/axle/6.html

Terry

 

[GTXperience]

Chances are that it is a 8.25 rearend. Just check the chart the demon posted or since I had the rearend chart on my desktop, I will post it here as well.

 

[FASTBACK340]

Two very good links! Thanks Terry!

 

[demon seed]

Thankyou John.

Terry

 

[340Dust-her]

wow, thank you so much.