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1957 - 1960 F100 & Larger F-Series Trucks Discuss the Box Style Ford Trucks

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Old 02-03-2012, 04:14 PM
Jrf100 Jrf100 is offline
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1958 f100 rear differential identificatio.

I have a 1958 f100. I am trying to figure out what kind of rear end is in my truck. I tried looking for any information on the differential but only was able to get dif 750. Does anyone know what this means. it has a side entrance to enter the oil on the right side. it has two dimples in the front. i can post pic if it helps out. thanks in advance.
Old 02-07-2012, 03:42 PM
mcdonaldm mcdonaldm is offline
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if it still has the stock rear end in it,it should be the 9" rear end. very easy to identify a Ford 9" from any other rear end. do a google search as there are lots of sites out there with info on the 9" rear and how to identify one.

this is one site that gives decent info

Ford nine inch differential cases +

the 9" rear was used from 57 to around the mid 80's in a vast majority of Ford cars and trucks so there are plenty of parts and factory ratios to pick from.

if you have a pic, would be easy to identify for you.

Old 02-08-2012, 03:51 AM
3414 3414 is offline
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In 58 (like all 57 to 60 F100s) the common axle is the Ford 9". But, if the truck had a limited slip, it would be a Dana. A quick way to check is to stand behind the rear bumper, and look under the truck. On the Ford 9" you will not see any bolt heads on the center part of the axle (there will be nuts on the front). The Dana will have bolt heads on the back.
Old 02-08-2012, 05:13 AM
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Walston Walston is offline
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Here is the ford 9" rear end that is in my 60. You likely have the same rear end if it is original. The original gear ratio in the 57-60 9" rears was 3.7:1. You may find a little tag where the nuts are that says 3.7.
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Old 02-08-2012, 05:13 AM

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