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What size rear dif do i have

(1990 Volvo 740)
in North Attleboro, MA on September 13, 2010
I am in the process of rebuilding my 1990 740 turbo Volvo and I am not sure what size rear diff I have. I have been told both a Dana 30 and a 31. If any body can tell me witch one it is or how to tell the difference I would be very grateful.
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on April 19, 2012
Are you refering to the ratio? This depends on the year and the type of tranny (auto/manual) and engine (non-turbo/turbo)your car is equiped with. The VIN plate is the key if everything is original.
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on September 16, 2010
This may be best left to the guys over at the forum
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