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Originally posted by RTM What year ford and is it a truck? A 9 inch will have a removable third member and an 8.8 will have a rear cover kind of like the dana 44 cover.
This is in fact if the truck in question is a half ton.
It's almost certainly the ford 9". I don't think the 8.8" came out until later. If it doesn't have an inspection cover on the back held on by bolts, it's definately a 9".
I agree it's most likely a 9 inch that year. As for the gear ratio it could be anything, 2.80 to 3.70. I have found those ratios from one to the other in 300 6cyl. trucks.
83 was the first year for the 8.8, but, the 8.8 and 9" were used side by side right up until 1986, the 8.8 is considerably more common in the later years however.