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Mar 24, 2011 | 08:35 AM

bigblue 78

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gears

i have a 78 f150 with 38.5 swampers and 3.54 gears would like to go to 4.10 gears do you think it would make a huge change?

Mar 24, 2011 | 09:08 AM

skidoodave

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From: Caledon ON

If your going to run the 38's then I would go with 4:56's. That will take you back to about a stock 3:50 performance wise. The 4:10's arn't enough IMHO.

Mar 24, 2011 | 11:25 AM

704 dentside man

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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.

Mar 24, 2011 | 01:46 PM

Sleepy445FE

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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.

Mar 24, 2011 | 02:36 PM

skidoodave

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From: Caledon ON

Hey Sleepy, nice chart.

Thanks..

Mar 24, 2011 | 10:45 PM

bigblue 78

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gears

thanks you guys i will look for a set of 456sto see what i can find here or maybe online around here.

Apr 3, 2011 | 07:37 AM

bigblue 78

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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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Apr 3, 2011 | 09:46 AM

skidoodave

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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.