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Old 06-05-2004, 02:41 AM
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Ford 9" gear id.

i picked up a 70's to maybe early 80's ford 9 in at a salvage yard. it was already out of the truck so i cant tell just what year (seals and bearings pressed to axle and race in tube). it had a tag that said 3.00 for the ratio so i picked it up thinking i could use the housing in my bronco with my third member i have already and use its 3rd member for my camaro that has 3.70 gears in it. when i pulled the member i found it to be a 31 spline which i can work around, i have my old open carrier laying around since i switched to a limited slip. however this supposed 3.00:1(no marking for locker or limited slip on tag) has a cone type limited slip in it and the ring is stamped 42 10 or 42101. the brass washers were all on and intact and it looked like it came this way is the number the ratio on the gear or is this one different than my other 2. the member destined for my bronco says 35 10 and thats what the tag read and my 3.70 is the same way. i know my 3.70 is a 1966 and my 3.50 is a 85-88. also the supposed 3.00:1 ring gear looks rather thin compared to my 3.50:1. when i did a rough count on the ring i came up with about 20-21 for the visible half. do i have a 4.20:1 gear set? thanks for the help.

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Old 06-05-2004, 03:16 AM
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why not count all the teeth on both ring and pinion and find out yourself.........
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Old 06-05-2004, 07:26 AM
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Question

Are the stamping numbers you posted on the ring gear? If so, re-check and see if there is also a stamping on the pinion gear. Was there anything else stamped on the tag other than the ratio?
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Old 06-05-2004, 09:39 AM
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Count the theeth on the ring gear and the teeth on the pinion and then divide they this will give you yous ratio.
Go to any of these sites to get all the part #s
www.sierrabronco.com/crossparts.htm
this one may help, might not go that new

www.ultrastang.com/rearinfo.asp?page_ID=1


www.quickperformace.com/ninecase.htm


www.ridgenet.net/~biesiade/Fordrears.html


This should get you just about everything about a 9" rearend you will ever need.
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Old 06-07-2004, 01:47 PM
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Quote:
Originally posted by KULTULZ
Are the stamping numbers you posted on the ring gear? If so, re-check and see if there is also a stamping on the pinion gear. Was there anything else stamped on the tag other than the ratio?
thats the way to do it on my 8" rearend i was curious and looked on the ring gear and there it was 2.73 and it said some date on there too
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