Biggest sized tire
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Joined: Jul 2009
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Biggest sized tire
I have a 00 Excursion V8 4x4 that I want to make into a wild off road machine. It is stock with 258,000 miles. I want to put the biggest tire i can on the chrome wheels that came with it (8 holes). I have 4" blocks all the way around so Im not worried about clearance. I just want something badass looking that can take the trail!!!!! 
Oh...PS...I am going to put new gears in it. (4.56) I have the back one installed but not the fronts yet. Can I run a different size tire up front to make up for the difference until I can afford the front gears?
Oh...PS...I am going to put new gears in it. (4.56) I have the back one installed but not the fronts yet. Can I run a different size tire up front to make up for the difference until I can afford the front gears?
Elder User
Joined: Oct 2007
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From: Nova Scotia
Your statements and questions belie your username...
Axle blocks on the rear axle are acceptable (although not ideal for offroading) but blocks on the front axle are not only a bad idea but illegal for road use.
I have never heard of varying tire diameters to compensate for mismatched axle ratio's but I am confident that it cannot/should not be done.
The biggest tire you are going to be able to fit on the truck with a 4" lift and the original width rim will be 33's. You will need to increase the width of your rims to accomodate a larger tire.
As far as being a wild offroad machine with the mods you have in mind, think again. These trucks are almost too heavy to be considered for serious offroading and to make them respectable 4X4's takes a lot of well thought out mods which costs thousands.
Good luck....
Axle blocks on the rear axle are acceptable (although not ideal for offroading) but blocks on the front axle are not only a bad idea but illegal for road use.
I have never heard of varying tire diameters to compensate for mismatched axle ratio's but I am confident that it cannot/should not be done.
The biggest tire you are going to be able to fit on the truck with a 4" lift and the original width rim will be 33's. You will need to increase the width of your rims to accomodate a larger tire.
As far as being a wild offroad machine with the mods you have in mind, think again. These trucks are almost too heavy to be considered for serious offroading and to make them respectable 4X4's takes a lot of well thought out mods which costs thousands.
Good luck....
Laughing Gas
Joined: Jun 2005
Posts: 1,009
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From: Colorado
4" blocks on the front are Illegal and Dangerous... you are putting the lives of everyone driving around you at risk... PLUS blocks gain you no additional suspension travel so absolutely no benefit for off roading... from you comments you sound like you should own a Dodge or a GM... or maybe you are not even old enough to drive yet?? Bigger tires are not going to make a better off road machine.. often they do the exact opposite.
As for front blocks they are Dangerous because they mess up your suspension geometery and steering alignment esp under emergency conditions like heavy braking. 80 % of your braking is done by the front brakes. when you break the weight and force cause axle wrap due to the leverage caused by distance from the axle to the spring. this will make one wheel esp with ABS move to rearward and roll forward and then spring back in the opposite direction...
this instantly changes your caster and toe in setting by several degrees making steering uncontrollable ( thus you flip over or crash into some innocent bystandard... keep in mind correct ranges for alignment are within a degree or less...
As for front blocks they are Dangerous because they mess up your suspension geometery and steering alignment esp under emergency conditions like heavy braking. 80 % of your braking is done by the front brakes. when you break the weight and force cause axle wrap due to the leverage caused by distance from the axle to the spring. this will make one wheel esp with ABS move to rearward and roll forward and then spring back in the opposite direction...
this instantly changes your caster and toe in setting by several degrees making steering uncontrollable ( thus you flip over or crash into some innocent bystandard... keep in mind correct ranges for alignment are within a degree or less...
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
As for front blocks they are Dangerous because they mess up your suspension geometery and steering alignment esp under emergency conditions like heavy braking. 80 % of your braking is done by the front brakes. when you break the weight and force cause axle wrap due to the leverage caused by distance from the axle to the spring. this will make one wheel esp with ABS move to rearward and roll forward and then spring back in the opposite direction...
I always thought the reason for no blocks up front was the increase lateral forces that the front axle endures versus the rear. You run the risk of having that block pop out sideways or even breaking a U-bolt in a sharp turn.
I cannot see how it could affect caster or camber at all nor do I see how it would cause axle wrap...well...maybe a bit about the axle wrap on hard braking.
Bottom line, is it a retarded idea and one born out of the backwoods and ghettos of the world.
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The blocks wont come out because we welded them on to the axles. So you don't have to worry about that Monstar.
So I cant use 4x4 until I get new gears up front?
Im more wanting to look like a wild off road machine cause I don't make a lot of money. If it can handle some of the trails around here then Im fine. As long as I look cool and can carry all my BEER!
I will look for 33 inch tires then.
So I cant use 4x4 until I get new gears up front?
Im more wanting to look like a wild off road machine cause I don't make a lot of money. If it can handle some of the trails around here then Im fine. As long as I look cool and can carry all my BEER!
I will look for 33 inch tires then.
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Post Fiend
Joined: Mar 2009
Posts: 11,798
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From: Mt. Shasta California
HUH??
I always thought the reason for no blocks up front was the increase lateral forces that the front axle endures versus the rear. You run the risk of having that block pop out sideways or even breaking a U-bolt in a sharp turn.
I cannot see how it could affect caster or camber at all nor do I see how it would cause axle wrap...well...maybe a bit about the axle wrap on hard braking.
Bottom line, is it a retarded idea and one born out of the backwoods and ghettos of the world.
I always thought the reason for no blocks up front was the increase lateral forces that the front axle endures versus the rear. You run the risk of having that block pop out sideways or even breaking a U-bolt in a sharp turn.
I cannot see how it could affect caster or camber at all nor do I see how it would cause axle wrap...well...maybe a bit about the axle wrap on hard braking.
Bottom line, is it a retarded idea and one born out of the backwoods and ghettos of the world.
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Elder User
Joined: Oct 2007
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From: Nova Scotia
I'm predicting a statistic in the making...
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I welded them on for saftey. Really my brother welded them on.
I dont have an problems braking. The casters are fine.
Posting Guru
Joined: Sep 2001
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You really need to do a lot more research on some more off-road baed forums. Your off on some of the things many would consider basic's. Your doing some dangerous things and you really need to put the tools down and just do some reading man. Not trying to be mean or anything, but your breaking some of the key rules that everyone follows. Mainly the blocks up front, the different size tires thing was amusing though. Get those blocks out of there and get a body lift and F250/350 springs or something if your tight on money and wanna stuff bigger tires in man.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
So I cant use 4x4 until I get new gears up front?
