Reference Application Chart
Steering Boxes And Racks Steering Boxes And Racks
Application. Size Spline Dia. Splines Application. Size Spline Dia. Splines
Ford Rack       GM Rack      
Mustang II & Pinto Manual 9/16"-26 .563 26 79 - Present 5/8"-36 625 36
Mustang II & Pinto Power 3/4"-36 .750 36 Variations 3/4"-30 .750 30
Ford Box       Corvette (84-Present) 17mm DD .670 .570
Manual & Power 3/4"-36 .750 36 Fiero 17mm DD .670 .570
GM Box Manual       Chrysler Box or Rack      
Vega 5/8"-36 .625 36 Chrysler - Omni Manual 9/16"-26 .563 26
Corvette (63-67) 3/4"-30 .750 30 Chrysler - Omni Power 9/16"-36 .563 36
Corvette (65-85) 3/4"-36 .750 36 Chrysler - Volare 5/8"-36C .625 36
Model 122 (65-85) 3/4"-30 .750 30 Chrysler 3/4"-36 .750 36
3/4"-36 .750 36 Chrysler 13/16"-36 .750 36
Model 525 (86-Present) 3/4"-30 .750 30 Misc.      
GM Power Box       Jaguar & MGB 3/4"-48 .750 48
Model 605 (78-84) 3/4"-30 .750 30 VW Rabbit - Diesel 3/4"-36 .750 36
Model 800 (77-Prior) 13/16"-36 .813 36 Note: Spline diameter will be slightly under or over measurement shown. Round to nearest size.
Model 800 (78-Present) 3/4"-30 .750 30

 

Steering Column Steering Column
Application. Size Spline Dia. Splines Application. Size Spline Dia. Splines
GM Column       Ford Column      
Small Spline 3/4"-36 .750 36 Small Spline 3/4"-DD .750x.550 36
Large Spline 1"-48 1.00 48 Small "DD" 1"-48 1.00 DD
Small "DD" 3/4"-DD .750x.550 DD Large "DD" DD 1.00x.750 DD
Large "DD" 1"-DD 1.00x.750 DD
Note: Spline diameter will be slightly under or over measurement shown. Round to nearest size.

 

Helpful Hints
Six Easy Steps to Ordering a Steering System
1 Choose the type of intermediate shaft you will be using (splined or DD)-this is one side of the U-joint you will need to order.
2 Determine whether you will need a two or three U-joint system. This is dictated by the angle, we recommend a 15° angle for the optimum system,however up to 30° is acceptable. If using a three U-joint system, a support bearing is necessary. The center U-joint will either be 3/4"DD x 3/4"DD or 3/4"-36 x 3/4"-36, depending on whether you are using splined or DD shafts..
3 Use the reference application chart to select the rack and pinion or box spline size you require. If the chart does not list your application, just measure the diameter of the shaft and count the number of splines. If there is a flat, count half the splines and double this number.
4 Measure your column. If DD (two rounds, two flats), measure the rounds-it will either be 1"DD or 3/4"DD. If splined, measure the diameter and count the splines i.e. 1"-48 or 3/4"-36.
5 If you are using splined shafting and a two U-joint system, measure the distance between the rack and pinion or box shaft and the column, subtract 3.25 inches. Round this number up to the next shaft size.
When using a Vibration Coupler subtract 5.25". When using a Vibration U-joint, subtract 4.5/8".
6 If using a three-joint system, we recommend using dowel rods to mock up the system. Just measure the length of the dowel rod and this will be the length of your shaft. Of course, you will need to order U-joints prior to shafts.

Helpful Hints

  • Phasing-Keep the forks of the yokes closest to each other in line and parallel to the center of the shaft to avoid binding. (See Figure A.)

Figure A
  • Set screws are supplied on all Splined and "Double D" U-joints. However, it is necessary to indent (by drilling) the shaft to properly secure the set-screw mechanism. Loc-Tite should also be used. (See Figure B.)


Figure B
  • The shaft should be flush with the ends of the u-joint yoke-too short could sacrifice strength and too long will cause the shaft to interfere with the operation of the u-joint. (See Figure C.)


Figure C
  • NEVER WELD a universal joint. Welding reduces the strength of the metal and can melt the needle bearing seal.

 

Steering Box Identification
Mustang Flaming River
Vega Style

 GM 122
.
GM 605 GM Corvair GM 800

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