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post #1 of (permalink) Old 10-08-2009, 11:06 AM Thread Starter
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Need help determining gearing!

I bought a 91 F150 , 6" susp lift with 35's. It has a SAS upfront and a 9 inch in the back. I am a little new to the truck muddin seen, so bear with me on the lingo. The axles that the 91 is sitting on come out of a 79 ish Ford pick up. There is not a tag on the back axle so I have no idea what the gear ratio is, but you can tell it has been tapped into. For the front I know its a Dana type, leaning towards Dana 44 I am assuming, however the tag on it shows
3 50 D9TA ACB #610067-2. From my research I gather that 3.50 gears are in it. But the rest of the tag I can't match anything to it after googling it. The closest I came was 610023-6 which was a Dana 60 that has 4.10 gears I believe. I am in the process of rebuilding 302 for it, so I couldnt' be accurate on how it performed i.e. high RPM, slow take off etc. I am wanting to drive it on the road/highway short distances, but mainly want to stick with muddin/haulin. Does 3.50 gears perform well with 35's or what kind of results would I get? Any input, suggestions would be appreciated. Thanks


Last edited by riverrat; 10-08-2009 at 11:56 AM.
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post #2 of (permalink) Old 10-08-2009, 03:53 PM Thread Starter
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Thumbs up I think I found the answer I was looking for..

For anyone else looking for a gear ratio to fit tire size or whatnot, I found a site with a gear table, check it out. :: Gear Ratio & Tire Size Chart

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post #3 of (permalink) Old 01-27-2010, 01:01 PM
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I have 4.11 gears in my '90 shortbed 5.0L and 35" tires and it works pretty good. My speedo even works perfectly, it matches the 3.55 w/stock tire combo exactly.
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