How To Identify Your Steering Gearbox
This guide will help you identify a Saginaw steering box and variations of each steering gearbox.
There are 5 different Saginaw gearboxes that Lee Power Steering sells and services.
- Saginaw 800/808 Gearbox: 1960s-2000s GM Cars and small trucks
- Saginaw 708 Gearbox: 1960s-1986 GM Trucks/SUV’s
- Saginaw GMT Gearbox: 1987-2000s GM Trucks/SUV’s
- Saginaw Ford Gearbox: 1971-1973 Mustang/Cougar
- Saginaw Bronco Gearbox: 1966-1977 Ford Bronco
We can do gearbox rebuilds on many other gearbox styles, but for anything other than the Saginaw models listed here you must send your gearbox info to us for rebuild.
Saginaw 800/808 Gearbox Identification
The Saginaw 800/808 gearbox is the most common type of GM steering gearbox found in GM cars and small trucks from the 1960’s into the 2000’s.
The difference between the Saginaw 800 and the Saginaw 808 is the size of the piston. The 800 has a 70mm piston and the 808 has an 80mm piston. This is easy to measure from the outside of the gearbox. If you measure the end cap, the 800 is roughly 3" and the 808 is just under 3.5".
It came in both a 3-hole "L" and 4-hole "H" mounting pattern. The 3-hole is the same pattern, just missing one hole and will fit directly into any vehicle that had a 4-hole pattern. They are much more common and easier to find cores, so we typically sell the 3-hole version. If you must have a 4-hole pattern it can be special ordered.
Saginaw gearboxes pre-1980 will have 5/8" and 11/16" SAE inverted flare fittings while gearboxes after 1980 will have 16mm and 18mm O-ring fittings. The older SAE gearboxes are very difficult to find, so we primarily sell the metric gearboxes.
If you are installing a gearbox into a pre-1980 vehicle that has inverted flare fittings, you can install a seat kit which allows you to thread your existing hoses. The SAE thread pitch will thread into the metric threads.
Along with the fitting style change in 1980, the input shaft also changed from 13/16-36 (pre-1980) to 3/4-30 after 1980. To accommodate for the smaller input shaft, you can simply change the rag joint.
When counting the splines, it is important to know that the 30 and 36 counts include any missing splines that are removed where a flat on the shaft is.
Saginaw 708 Gearbox Identification
The Saginaw 708 gearbox was found in GM trucks and SUV’s up until 1986. It is easy to identify because it mounts on the outside of the frame and the mounting tabs are on the opposite side of the gearbox. Notice how the mounting holes are on the top side of the gearbox.
The one variable with the Saginaw 708 gearbox is that it came with two different sector shafts. A threaded shaft (found in 2WD vehicles) and a notched shaft (found in 4WD vehicles).
Gearboxes before 1980 will have 5/8" and 11/16" SAE inverted flare fittings while gearboxes after 1980 will have 16mm and 18mm O-ring fittings.
Again, the older SAE gearboxes are very hard to find, so the majority of the gearboxes we sell are metric. If you are installing your gearbox into a pre-1980 vehicle that has inverted flare fittings, we can install a seat kit that will allow you to thread your existing hoses. Yes, the SAE thread pitch will thread into the metric threads!
Saginaw GMT Gearbox Identification
The Saginaw GMT gearbox is found in GM trucks and SUV’s from 1987 on. It uses a 3 bolt "triangle" pattern and has many variations!
Piston Bore Size
There is a casting number on the housing of the gearbox (either 83 or 84) that helps identify the piston bore size. Casting number 83 is a "small bore" GMT400. Casting number 84 is a "big bore" GMT800.
Most of the time, 1500 2x4, 1500 4x4 and 2500 2x4 use the small bore, and 2500 4x4, 3500 2x4, 3500 4x4 use the big bore, but there are some exceptions.
Blind Spline
Most vehicles use a sector shaft with 3 blind splines, but some (usually Diesel models) have 4 blind splines. You will need to know which version you have.
End Cap Number
Some models of vehicles have different internal stops to limit steering travel. There is an end cap number that will let us know what stops you need.
Input Shaft
It is also a good idea to verify the input shaft type on your gearbox. Vehicles from 1987-2000 should have a 3/4-30 splined input shaft and 2001 to present use a DD input shaft. Some models around the 2001 switch over may not follow these guidelines.
If you have all this information, you can search our inventory online and order your gearbox today.
Saginaw Ford Gearbox Identification
This gearbox was used on limited Ford Mustang and Ford Cougar models from 1971-1973. It uses a 3-bolt triangle pattern that is very similar to the Saginaw GMT gearbox, but has 7/16-14 mounting bolt threads.
Since this is a pre-1980 gearbox it will have 5/8" and 11/16" SAE inverted flare fittings and use a 13/16-36 input shaft.
We can build this gearbox with either a 12:1, 14:1 or 16:1VR, but most customers end up going with the 12:1 and a 35# valve.
Saginaw Ford Bronco Gearbox Identification
This gearbox is found in 1972-1977 Ford Broncos. It originally came with a 21:1 ratio. You can buy the Saginaw Bronco gearbox with a 14:1 and a firmer valve for the perfect feel.
