gears
Posting Guru
Joined: Mar 2010
Posts: 1,196
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I agree that 4.10's aren't enough for that set up, but I do think they'd make a pretty big difference over 3.55's. Personally, when I get in to the 37-40" tire range, I like bumping to a 4.88, but I also like maximizing power to the ground.
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
You would need a 4.30 gear to equal the 3.54. But of course you can't get that in these axles. I agree go with the 4.56s. You need to get the power to the ground with large tires.
Gear Ratio Calculator
Here's a gear ratio calculator so you can compare gears to gears.
Gear Ratio Calculator
Here's a gear ratio calculator so you can compare gears to gears.
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New User
Joined: Mar 2011
Posts: 4
Likes: 0
gears
i want to change from 33.50 to 4.56 gears but have heard that i must grind out the housing on my 9 inch to go from 3.50 to 4.56 gears is that so?
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Senior User
Joined: Mar 2011
Posts: 263
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From: spotsy va
if ur not sure man go on the jeffs bronco graveyard n they have a gearing chart on there website which is very helpfull
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Tuned
Joined: Nov 2010
Posts: 426
Likes: 1
From: Caledon ON
When I had my first 78 F150 back in the early 80's it came with 3.50s. I put a set of 4.56's in it to turn my 38" mudders. I didn't do any mods to the 9" housing at all. I think the gear set was either Richmond or Zoom.
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