what gear ratio do i need?
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Junior User
Joined: Aug 2007
Posts: 97
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From: florida
what gear ratio do i need?
i have an 02 f250 v10 with 3.73s but im extremely slow with my 35 inch tires. its very hard to break my tires loose even with all of the little things ive put into my truck.
what gears would anyone recommend, keeping in mind that i dont want to top out any less than 100mph?
what gears would anyone recommend, keeping in mind that i dont want to top out any less than 100mph?
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
4:56 gears for 35's would be best.
No way I would spin 35s past 95mph.
I've been over 100 with my 285s a couple times but that was for a short time.
Anyone who wants to drive over 100mph is entitled to. They just have to be willing to accept the consequences.
No way I would spin 35s past 95mph.
I've been over 100 with my 285s a couple times but that was for a short time.
Anyone who wants to drive over 100mph is entitled to. They just have to be willing to accept the consequences.
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Junior User
Joined: Aug 2007
Posts: 97
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From: florida
i have the superchips tuner and with my current setup ive hit roughly 115 mph at about 4,000rpms but the best part is at over 100 mph the odometer shuts off and i can driive without adding miles. i dont know what my tires are rated for but its one hell of a time ridin that fast with those tires and my extremely stiff procomp lift. its also fun doing everything without power steering. anyone wanna sell me a pump?
Cargo Master
Joined: Nov 2004
Posts: 2,751
Likes: 3
From: So Oregon
I had a friend who's tires came apart at over 100mph. You might check your speed rating on your tires. He wasn't driving a SD. BTW, he didn't make it. I've got nothing against speed, but make sure you have the right equipment to handle it.
I would probably go for 4.56.
I would probably go for 4.56.
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
4.56:1 would be best in my opinion
100+ MPH on any truck tire is asking for a LOT of trouble... sure hope you do those over 100MPH runs all by yourself, way out in the country, or at a drag strip
I was pushing the high side of 75MPH on a slight easy curve in my 1 ton dully 7.3L one fine morning and had ONE front tire let loose explosivly.... trust me a BIG truck is a real bear to control and bring to a safe stop when she is down on the rim...damned expensive too!
100+ MPH on any truck tire is asking for a LOT of trouble... sure hope you do those over 100MPH runs all by yourself, way out in the country, or at a drag strip
I was pushing the high side of 75MPH on a slight easy curve in my 1 ton dully 7.3L one fine morning and had ONE front tire let loose explosivly.... trust me a BIG truck is a real bear to control and bring to a safe stop when she is down on the rim...damned expensive too!
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Junior User
Joined: Aug 2007
Posts: 97
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From: florida
wow! i never thought about my tires blowing. i dont carry a spare tire because my first exhaust melted through it and some homeless guy stole it and used it for a table in this little alley we race in when i had parked to go fishin. i guess when i get new tires i should check the ratings and get a spare.
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Posting Guru
Joined: Jun 2005
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From: central Louisiana
according to this web site http://www.accuautoparts.com/#
@ 60mph w/ 4.56's = 1839rpm
@ 70mpg w/ 4.56's = 2145rpm
@ 80mph w/ 4.56's = 2451rpm
@ 100mph w/4.56 = 3064rpm
for an example
70mph w/ 4.88's = 2296rpm
8000lb 100mph projectile.........whew. i will cruze about 70-75 with mine, and that's usually about it. even towing open road i set at about 60-65.
soething else to think about is the extra mass that the tires have. although the calculators say that XXX gear would be best, they don't factor in the added weight of the larger tires. if you looking at a 4.56 you might want to jump one step to a 4.88 just for the weight factor (just an example). i hear alot about that from the 5.4L guys, when the calculator says 4.30 they jump to a 4.56 OR even a 4.88 and that makes up the difference for the low power, and larger tires.
i may be selling my 4.56's (not sure yet), if you might be interested.
@ 60mph w/ 4.56's = 1839rpm
@ 70mpg w/ 4.56's = 2145rpm
@ 80mph w/ 4.56's = 2451rpm
@ 100mph w/4.56 = 3064rpm
for an example
70mph w/ 4.88's = 2296rpm
8000lb 100mph projectile.........whew. i will cruze about 70-75 with mine, and that's usually about it. even towing open road i set at about 60-65.
soething else to think about is the extra mass that the tires have. although the calculators say that XXX gear would be best, they don't factor in the added weight of the larger tires. if you looking at a 4.56 you might want to jump one step to a 4.88 just for the weight factor (just an example). i hear alot about that from the 5.4L guys, when the calculator says 4.30 they jump to a 4.56 OR even a 4.88 and that makes up the difference for the low power, and larger tires.
i may be selling my 4.56's (not sure yet), if you might be interested.
Thread Starter
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Junior User
Joined: Aug 2007
Posts: 97
Likes: 0
From: florida
i would be interested if u have front and back gears because i actually use my 4 wheel drive. alot of guys down here are all show with their huge lifts and fast trucks but nobody takes them out to mud or tow. they just look pretty.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Your tires should have a speed rating molded on the sidewall of the tire.
Speed is expressed by letter. For example a BfGoodrich AT KO LT315/75R16/D has a "Q" speed rating or max speed under load of 99 mph. The speed rating is after the load index on the tire. On the above tire it would read 121Q on the sidewall. 121 is the load index and Q is the speed rating.
Speed is expressed by letter. For example a BfGoodrich AT KO LT315/75R16/D has a "Q" speed rating or max speed under load of 99 mph. The speed rating is after the load index on the tire. On the above tire it would read 121Q on the sidewall. 121 is the load index and Q is the speed rating.
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Originally Posted by triton's best
the tires are load range d 121N idk what that means. theyre blemish tires called dean mud terrains.
N is a pretty low speed rating probably around 85mph max.