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I am trying to figure out what axle ratio is in my truck but using the decoder I cannot find mine...It is listed as H4J...but under the H4 grid in the decoder I am using it doesn't have an axle for a 1978
The truck is a 1978 F100 Explorer if I am reading the Body tag part correctly...although I "thought" when I first got the truck the badge on the side said custome but I cannot remember and don;t have the badges anymore.
So 78 F100, should be a common 1/2 ton, 5 lug 9" rear axle. X2 have you looked at the axle itself? There should be a tag/plate held on by 1 or 2 nuts that hold the center section in place. See the attached pic. Worse case you can to the jack it up and mark the tire, then rotate the tire count the d/s revoulations to get real close to the ratio. Other wise have to pull the axles and then the center section and see what is stamped on the ring gear.
H4 '74-'75 3.25 ratio, 3.6M capacity Ford Limited Slip
'76 3.25 ratio, 3.75M capacity Ford Limited Slip
So 78 F100, should be a common 1/2 ton, 5 lug 9" rear axle. X2 have you looked at the axle itself? There should be a tag/plate held on by 1 or 2 nuts that hold the center section in place. See the attached pic. Worse case you can to the jack it up and mark the tire, then rotate the tire count the d/s revoulations to get real close to the ratio. Other wise have to pull the axles and then the center section and see what is stamped on the ring gear.
H4 '74-'75 3.25 ratio, 3.6M capacity Ford Limited Slip
'76 3.25 ratio, 3.75M capacity Ford Limited Slip
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