9-inch gear swap?
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Mountain Pass
Joined: Dec 2004
Posts: 123
Likes: 1
From: Maryland
9-inch gear swap?
Hey everyone...I have a '79 F-150 with a 300ci six and SROD, and it can't get out of its own way. I suspect it's the rear ratio that's killing me. I checked the tag, and apparently it's a 2.75. I don't need a lot of power out of the thing, but I'm tired of being the slowest thing on the road. I can barely use the OD! would going to a slightly numerically higher ratio like 3.08 or 3.25 solve this? or do i need to go to 3.50?
Second, how hard is it to swap the gears by myself? I've never done rear work, but i'm fairly competent with my tools.
Should I replace the carrier, or just look for a ring and pinion? Or just find a complete axle at a junkyard (which is where I'd be getting any of these parts)?
Second, how hard is it to swap the gears by myself? I've never done rear work, but i'm fairly competent with my tools.
Should I replace the carrier, or just look for a ring and pinion? Or just find a complete axle at a junkyard (which is where I'd be getting any of these parts)?
Postmaster
Joined: Jun 2003
Posts: 4,191
Likes: 0
From: WA
lots of existing threads on this topic.
1st, play with a ratio calculaotr ro see what RPMS different rations will put you at.
http://www.dfw-tx4wd.org/gears.html
You can regear it yourself if you take your time, and learn how. Also, buying a junkyard 3rd member isnt a bad idea. 3.50's are real common.
1st, play with a ratio calculaotr ro see what RPMS different rations will put you at.
http://www.dfw-tx4wd.org/gears.html
You can regear it yourself if you take your time, and learn how. Also, buying a junkyard 3rd member isnt a bad idea. 3.50's are real common.
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