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How do I choose the correct wheels?
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All wheels may be ordered using the backspace guideline charts below, but
remember to measure your installation carefully.
Reversed wheels have rims turned around on the centers which allows
for less backspace and deeper front space.
No additional charges for reverse wheels or special backspacing.
NOTE:
Standard wheels with more than 4 1/2" backspace will NOT clear
disc brakes.
Wheels are identified by their inside (wheel width) measurement.
Overall width is always one inch wider. For example: A 15 X 7 measures
7" bead-to-bead and 8" overall.
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STANDARD WHEEL BACKSPACE |
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14 X 5 1/2 |
14 X 6 |
14 X 7 |
15 X 5 |
15 X 6 |
15 X 7 |
15 X 8 |
15 X 10 |
15 X 12 |
15 X 14 |
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Standard
Backspace
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3 |
3 1/4 |
3 3/4 |
2 3/4 |
3 1/2 |
4 |
4 |
4 1/2 |
4 1/2 |
4 1/5 |
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Minimum
Backspace
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3 |
3 1/4 |
3 3/4 |
2 1/2 |
3 1/2 |
3 3/4 |
3 3/4 |
4 1/4 |
4 1/2 |
4 1/2 |
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Maximum
Backspace
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3 7/8 |
4 3/8 |
5 1/4 |
3 |
4 1/8 |
5 1/4 |
6 |
7 1/2 |
9 3/4 |
11 3/4 |
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REVERSE WHEEL BACKSPACE
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14 X 5 1/2 |
14 X 6 |
14 X 7 |
15 X 5 |
15 X 6 |
15 X 7 |
15 X 8 |
15 X 10 |
15 X 12 |
15 X 14 |
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Minimun
Backspace
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1 3/4 |
1 3/4 |
1 3/4 |
2 |
2 |
2 |
2 |
2 1/2 |
2 |
2 |
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Maximum
Backspace
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2 5/8 |
3 |
3 1/2 |
2 5/8 |
2 3/4 |
3 1/8 |
4 1/2 |
5 3/4 |
7 |
9 |
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Shipping
Weights (lbs) |
21 |
22 |
24 |
23 |
25 |
27 |
28 |
34 |
39 |
43 |
Determining your Bolt Pattern
Follow the diagram to measure. You must add 1/4" to
your measurement to determine the correct bolt pattern.
For Example:
When X is 4 1/4"........your bolt pattern is 5 lugs on 4 1/2"
bolt pattern.
When X is 4 1/2"........your bolt pattern is 5 lugs on 4 3/4"
bolt pattern.
When X is 4 3/4"........your bolt pattern is 5 lugs on 5"
bolt pattern.
When X is 5 1/4"........your bolt pattern is 5 lugs on 51/2"
bolt pattern.
NOTE: Our 6-lug wheel measures 5 1/2" from the center of one stud,
across the center of the wheel, to the center of the stud directly opposite.
How to Determine Wheel Size
Following is a simple method to determine what size wheel will fit your vehicle.
This method will work on both stock front and/or rear ends, or those
that have been modified (widened or narrowed).
Let's say you want an 8" wheel in back and 6" up front.
1.) Jack up your front or rear end and remove the wheel.
2.) Cut a strip of wood 9" long (overall width of proposed 8"wheel)
and hold the wood in the fender where you know the wheel would clear
everything (allow about 1" clearance on either side for "tire
bulge").
3.) The amount of wood that extends back past the drum/rotor face would
be the backspace to order.
4.)Try the same at the front with a 7" wood strip (overall width
for a 6" wheel) to determine the backspace and clearance at the
front. |
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What Factors Cause Front End Shimmy?
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Frontend shimmy is caused by a number of things.
The combination of worn out components and or frontend alignment will cause serious problems.
First and foremost, the components that make up the steering assembly must be in good condition. These components are:
Tierod ends
Heim Joints
King Pins and bushings
Steering links
Drag link
Radius rods
Pittman arm
Steering box bushings
Hub bearings
Shackle bushings
All of these components must be in good condition. Replace any part which shows wear, or movement beyond design specifications. If in doubt, replace it.
Assuming all of your components are OK, the next step is to align the frontend. If your T Bucket has bias ply tires then you should have a maximum of 1/8" toe in. Radials should be "0" to 1/8" toe out maximum.
The final step, (and VERY important) is to balance the complete rotating assembly! Attempt to balance your tires mounted on the hubs if possible. If this option is not available to you, then balance the components separately. Your drums or rotors and tires must be accurately balanced!
Tire inflation has been a subject of controversy for a very long time. But there is a basic starting point. For spoked wheels, (motorcycle type) start at MAXIMUM inflation. Generally 45/50 lbs. For all other tires, start at 28/32 lbs. Test your T on several road surfaces especially rough roads. Inflate or deflate your tires to minimize bouncing. You will always get some bouncing, but less is better. Make sure that both front tires have EXACTLY the same air pressure.
There is a big difference between shimmy and bounce! You need to avoid shimmy at all costs! This is a self induced harmonic which will destroy your whole frontend and possibly cause a serious accident. Shimmy starts when the rotating mass (tires, wheels, hubs, and rotors or drums) harmonics go into oscillation with the steering components(links, bushings, rods, and tie rods). They "push" against each other causing a violent back & fourth motion (Shimmy). Because this motion is self induced, it progresses until something breaks, or over come by an external force (IE: hit the brakes and slow down). It is imperative that your frontend be in absolutely perfect working order.
Have you ever rolled a tire around your garage, or down a street before? If you have, then you may recall how the surface governed the direction the tire rolled. This same condition exists on your T Bucket. To overcome this, a frontend alignment is setup to create an equal force on both front wheels. This effect is called "toe in" or "toe out". This equal force tends to overcome most road surfaces, making the frontend responsive to the drivers command. However, too much of either can create a new set of problems. Tire scuffing will be the first on the list. Then there is the problem of shimmy. Toe in tends to cause shimmy more than toe out. Zero toe in/toe out will virtually eliminate shimmy however your frontend will feel "loose". In other words, your car will walk back and forth while cruising. This effect is usually manageable, but annoying. Regardless which "toe" effect you need, limit the adjustment to a maximum of 1/8" The next adjustment available to you is "CASTER". This is the tilting of your king pin bosses. This caster effect tends to make your front wheels follow the centerline of the front axle. Caster is good for helping your T track straight. You always want the caster effect to "follow" your axle. You adjust your caster by adjusting the length of the UPPER clevises on your radius rods. Typically, about 5 degrees of caster is plenty, and in some cases 2 or 3 degrees is all thats required. Have you ever pushed a shopping cart around a grocery store, and noticed sometimes the front wheels shimmy? Thats way too much caster! So go easy on your caster adjustment. Finally, there is camber... you can't change it easily because it's built into the king pin bosses. However, as your king pin bushings wear out, you induce more camber. So check your king pins & bushings occasionally for wear. |
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How To Properly Adjust a Steering Box?
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This is the layman's version on how to adjust a steering box. Please read it through completely!
There are two adjustments, the worm bearing tension, and the gear mesh adjustment. First, jack up the vehicle so the front wheels are off the ground, so the steering is free to turn and, the steering box is centered. Put jack stands under the frame!
Whatever you do, “do not” try to adjust out the play at anything other than straight ahead!! You'll kill the box on short order because the worm has a high spot in the center position.
{Before attempting to do this first adjustment, make sure that you back off on the gear mesh screw on the side of the box from 1 – 2 turns.}
The worm bearings are adjusted by loosening the big lock nut, then turning the bearing housing. On the reversed Corvair box, look at the top of the box, where the steering shaft (to the steering wheel) sticks out. On other steering boxes, this adjustment is at the bottom of the box, at the front. Usually a hammer and blunt punch will loosen the locknut. The bearings should be adjusted to get a few inch-pounds of drag on the worm gear (steering wheel), but you can adjust it by tightening up to remove the play, then go just a smidgen tighter, and tighten the locknut securely {make sure you hold the adjusting nut in place while tightening the lock nut}. Now, turn the steering wheel from lock-to-lock. There should be no binding. If there is, loosen the worm shaft adjustment slightly until the binding is gone.
Next, adjust the gear mesh, which is the slotted screw with a {usually} 5/8" hex locknut. Get the steering centered (wheels straight ahead), and loosen the locknut. Gradually tighten the adjusting screw in, while frequently checking the steering play by turning the steering wheel back and forth a turn or two...but leave it centered when adjusting. Eventually, you will take up the slack, unless the gears/bushings are really worn, in which case the adjusting screw will go all the way into the box! (Not good). Tighten till the slack is all gone, then add about a half turn of preload to it. If all is well, you should feel the steering get just a little bit harder as you pass thru the center of the steering wheel's travel. Tighten the locknut securely, and enjoy the "new" feel of driving your vehicle.
A good gear lube from the local GM dealer works really well. The correct GM part # for this lubrication is 1052182. This lube is half way between grease and oil. Oil is too thin and leaks out, and grease is too thick and won't properly lube the re-circulating balls.
If all the above adjustments fail and you don’t want to attempt rebuilding a box yourself, buy a rebuilt or new unit to replace it with. |
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Will TP's interior fit my T body?
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TP bodies have 14" pick up bed and non-opening doors.
Outside to outside Dimensions to check:
Widest point: 46"
Narrowest point: 27 1/2" (bottom of firewall)
Top of dash to floor: 20 1/2"
Top of door to floor: 17-1/4"
Top of back to floor: 22 3/4"
Dash to rear: 44 1/4". |
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