gear ratio
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Tuned
Joined: Mar 2001
Posts: 491
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From: MS.
gear ratio
I've decided I am going to change my gears.96 f450,right now I don't know what ratio I have.I do know its screaming rpms in 5th making me wish I had another gear.what is the best ratio to use?I need a hwy truck not a sherman tank
Super Moderator
Joined: Apr 2004
Posts: 34,527
Likes: 2,830
Not sure what tire size you have.
What RPMs are you turning at 60 mph?
Your 5 speed, is that a manual trans?
What engine?
IF you have a 33 inch tire, and a .76 5th gear, and 4.10 gears, you would be going 60 mph at 1900 rpm.
So it's hard to figure what you've got if it's screaming--shorter tires, much shorter gear...???
What RPMs are you turning at 60 mph?
Your 5 speed, is that a manual trans?
What engine?
IF you have a 33 inch tire, and a .76 5th gear, and 4.10 gears, you would be going 60 mph at 1900 rpm.
So it's hard to figure what you've got if it's screaming--shorter tires, much shorter gear...???
Super Moderator
Joined: Apr 2004
Posts: 34,527
Likes: 2,830
Those show as 31.5 or 32.
2900 rpm
31.5 tire
.76 high gear
4.88 axle
73 mph
Calculator here:
Novak Conversions - Gearing & Gearing Math for Jeeps
Change to 4.10s:
RPM drops to 2326 at 70.
I don't know what axle you have, so I can't search for gear sets, but you can figure that out.
Can you go to a taller tire?
33s take you down to 2643 at 70, for example.
2900 rpm
31.5 tire
.76 high gear
4.88 axle
73 mph
Calculator here:
Novak Conversions - Gearing & Gearing Math for Jeeps
Change to 4.10s:
RPM drops to 2326 at 70.
I don't know what axle you have, so I can't search for gear sets, but you can figure that out.
Can you go to a taller tire?
33s take you down to 2643 at 70, for example.
Super Moderator
Joined: Apr 2004
Posts: 34,527
Likes: 2,830
You probably have 4.88s, see post 4.
If you can't go taller tires, then the gear change is the only option unless you put an aftermarket OD in--which can be done for about $3000.
Gear Vendors under/overdrive Trucks / Towing, Chevrolet /GMC, Dodge / Dodge RAM, Ford auxiliary transmissions.
Sterling info:
Ford 10.25 & 10.50-Inch Axle Tips - Four Wheeler Magazine
If you can't go taller tires, then the gear change is the only option unless you put an aftermarket OD in--which can be done for about $3000.
Gear Vendors under/overdrive Trucks / Towing, Chevrolet /GMC, Dodge / Dodge RAM, Ford auxiliary transmissions.
Sterling info:
Ford 10.25 & 10.50-Inch Axle Tips - Four Wheeler Magazine
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