![]() These units had a 3.5-inch piston diameter, and the pitman shaft will turn anywhere from 3.5 to four turns between fully locked left and fully locked right. Station wagons, full-size cars and large front-wheel-drive cars used a heavy-duty gearbox usually identified by GM part number 5687962. ![]() GM also used two gearboxes, depending on the weight and size of the model. The 605 units use a single snap ring that holds a round cover into the top of the housing. An 800 unit has a four-bolt cover on the top of the unit (the end of the shaft opposite the pitman arm spline). The only major difference between these two units is how the pitman shaft is held into the unit. You will often see this gearbox referred to as an "800" or "605" unit. They are referred to as recirculated ball-type because they use the same ball bearings on both the worm gear and the sector gear to reduce friction within the housing. The Saginaw gearbox is a rotary-valve type unit using recirculating ball bearings. Looks like they are all the same, might be mistaken. I found this info on steering gear boxes.
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