Why measure first
Forty-year-old trucks have had parts swapped, axles changed and boxes replaced. What the truck left the factory with may not be what's on it now. A part number from a forum post or a parts-counter lookup is only a lead: confirm it against the part in your hands and the maker's application list.
The method
- Record the truck: year, model (D/W 150/250/350, Ramcharger, or the Jeep code), 2WD or 4WD, engine, and front axle.
- Record what's actually there: the box position, the linkage layout (see layouts), and any tags or casting marks.
- Measure the interfaces: input and sector shaft diameters and splines, port fittings, tie rod end taper and thread, and the bolt pattern.
- Read the maker's application list: reputable makers publish year, make and model tables and full specs. Match your measurements to those specs, not to the product title.
- Ask with your data: send the seller your measurements and photos and get the fitment confirmed in writing before you order.
- Test-fit before final assembly: check clearance through full steering and suspension travel.
Worksheet
| Vehicle (year / model / 2WD-4WD) | |
|---|---|
| Front axle | |
| Linkage layout | |
| Box position (4WD / 2WD) | |
| Input shaft: diameter / splines | |
| Sector shaft: diameter / splines / master splines | |
| Ports: type / thread | |
| Rotation / turns lock to lock | |
| Tie rod end taper / thread | |
| Steering shaft: column end / box end | |
| Pump: fittings / brackets | |
| Seller confirmation (date / name of shop) |
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Red flags
- A listing that fits "all" years of a long-running truck with no notes.
- No published specs, or specs that don't match what you measured.
- Parts that need heating, bending or welding to fit steering components. Don't do it.
- Advice that depends on one forum post with no photos or measurements.
Last reviewed 2026-10-19. General information only: verify with your service information and parts maker.