4.30 Gears
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Joined: Sep 2004
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From: League City Tx
4.30 Gears
I have a 2004 FX4 Supercrew with the 5.4 engine and 325/60 R18 tires. The tires are approximately 33" tall. Stock gears are 3.73. I am considering going to 4.30 gears and wanted to know how much of an RPM increase I should expect. Anybody have any experience with this combo of tire size and gear ratio?
Post Fiend
Joined: Jan 2007
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From: Stanton DE
Sorry to say but you will not find any 4.30 reverse cut gears. I don't think anyone makes them. This is what i have found to be true!
You would have to go with a 4.10 or 4.56 or stay with your 3.73s
You would have to go with a 4.10 or 4.56 or stay with your 3.73s
Senior User
Joined: Apr 2006
Posts: 430
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From: Springville, AL
phil6608 is right, 4.10 and 4.56 are available for the 9.75 rear end, I have not seen anywhere where 4.30 is available.
As for your RPM question, you could use this calculator:
http://www.ring-pinion.com/Calc_RPM.aspx
or
http://www.ring-pinion.com/Calc_GR.aspx
As for your RPM question, you could use this calculator:
http://www.ring-pinion.com/Calc_RPM.aspx
or
http://www.ring-pinion.com/Calc_GR.aspx
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Joined: Sep 2004
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From: League City Tx
Your are right phil6608. I made a couple phone calls after I made my original post and found out the same info. I guess I should have done my homework before posting a question. In my opinion changing from 3.73 to 4.10 is not really worth the money and going to 4.56 is a bit to low of a ratio with my tire size for highway use. Thanks for the help guys.
Fleet Owner
Joined: Mar 2003
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From: Blue Hill Township
Originally Posted by Scott_M
Your are right phil6608. I made a couple phone calls after I made my original post and found out the same info. I guess I should have done my homework before posting a question. In my opinion changing from 3.73 to 4.10 is not really worth the money and going to 4.56 is a bit to low of a ratio with my tire size for highway use. Thanks for the help guys.
I think you just need larger tires so that the 4.56s aren't bad.
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Post Fiend
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From: Louisiana
I don't know why everyone always says: They don't make them. They been making them for a while now, and it is a good thing, b/c 4.10 just isn't enough, and 4.56 is almost to much.
The thing I'm unsure about is the front. I've seen at least 2 trucks that supsoedly had 4.30 gears. I haven't personally seen the company that makes that ring and pinon for the front, but I know they make it for the rear.
The money you'd spend on the gear change almost isn't worth it.
IF you had 3.55s and 35" tires, I'd highly suggest some 4.30s or 4.56s.
But with only 33s and 3.73s....... The $1,500 just isn't worth it.
The thing I'm unsure about is the front. I've seen at least 2 trucks that supsoedly had 4.30 gears. I haven't personally seen the company that makes that ring and pinon for the front, but I know they make it for the rear.
The money you'd spend on the gear change almost isn't worth it.
IF you had 3.55s and 35" tires, I'd highly suggest some 4.30s or 4.56s.
But with only 33s and 3.73s....... The $1,500 just isn't worth it.
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I had some 285s and I forget the height on them but they were huge on the stock Expy rims. I really didn't notice any performance with those before or after. It still seemed to be a faster truck than my other '98 Expedition (tranny is going out though).
I now have 4.30s in my truck (stock) and the first gear is very rev happy. Since it's a 6 speed, it turns about 2K at 75 mph.
To continue with what I was saying earlier, I'd say, if you don't need the extra performance, it's probably better just to keep stock and make up that power with some pipes and intake. If you want to keep the low end power, stay with close to stock size pipes making sure you never go from larger to smaller and stay with single exhaust tip. If you want some high end, dual exhaust is the way to go. I chose dual because I love the way it looks. An intake would help quite a bit with letting that exhaust/engine breathe.
-rockstate
I now have 4.30s in my truck (stock) and the first gear is very rev happy. Since it's a 6 speed, it turns about 2K at 75 mph.
To continue with what I was saying earlier, I'd say, if you don't need the extra performance, it's probably better just to keep stock and make up that power with some pipes and intake. If you want to keep the low end power, stay with close to stock size pipes making sure you never go from larger to smaller and stay with single exhaust tip. If you want some high end, dual exhaust is the way to go. I chose dual because I love the way it looks. An intake would help quite a bit with letting that exhaust/engine breathe.
-rockstate
MMNC (SS)(Ret)
Joined: Mar 2004
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From: SE Georgia
4.10's will make a big difference, but not enough to justify the price tag. 4.30's will make you snap your neck off the line. try some 4.56's and 35" or 37" tires
your best bet is just stay stock or get the performance elsewhere.
your best bet is just stay stock or get the performance elsewhere.
