Eight pass-through POM drivers that seat Ford 4R100 case, pump and drum bushings square in the bore without scoring the aluminum.
Rebuilding a Ford 4R100 out of a Super Duty, Excursion, E-Series van or Navigator and need to set new bushings without cocking them in the bore? This eight-piece driver set is sized for the 4R100 bushing positions in the pump, the drums, the case and the extension housing. It is tooling only, with no bushings in the box, made for the shop or home builder who wants each bushing seated square and at the right depth instead of hammered in with a socket.
Bushings are the bearings that keep the shafts and drums of the 4R100 centered. When one goes in crooked, or its edge rolls over during install, the shaft runs off center from the first mile. That wears the sealing rings, bleeds off the oil that feeds clutches and the converter, and ruins the new parts you just paid for. Each driver in this set has a pilot that enters the bushing and a shoulder that pushes evenly on its face. The drivers are machined from POM, also called acetal, a hard engineering plastic. Against an aluminum pump body or case that is the safer choice: a steel driver that slips can gall the bore or nick the bushing's leading edge. Manufacturer part number A75W1940ABB1.
Bushing wear is confirmed on the bench. Slide each shaft into its bushing and rock it; any felt play is too much. Look for scoring and for the bronze layer worn through to the backing. Sonnax notes that the early E4OD rear case used two bushings that wore early from poor lubrication, so this family has a history of bushing trouble that justifies changing every one during a rebuild. Sonnax engineers also traced 4R100 converter clutch complaints to low pump volume at low engine speed, which is why a tight pump bushing matters for lockup. Before blaming bushings for a pressure complaint, rule out the electrical side with our EPC solenoid symptoms guide, and see the E4OD and 4R100 common problems guide for the hard-part failures to look for during teardown.
Sized for the 4R100 as used in 1999-2005 Ford Excursion, 2000-2004 F-250 Super Duty, 1999-2004 F-350, F-450 and F-550 Super Duty, 2002-2004 E-Series vans and 1998-2004 Lincoln Navigator, with some 1999-2002 Expedition and 1999-2003 F-150 applications listed as well. On the F-150 and Expedition only the 4R100-equipped trucks apply, such as the SVT Lightning, because many of those vehicles used the lighter 4R70W instead. The E4OD shares the case family but not every bushing size, so check your transmission tag first. The 4R100 vs E4OD guide shows how to tell them apart, and parts for both are on the E4OD/4R100 parts page.
| Pieces | 8 pass-through bushing drivers |
| Fits transmission | Ford 4R100 |
| Driver material | POM / acetal (non-marring) |
| Bushings included | No - drivers only |
| Manufacturer part number | A75W1940ABB1 |
| Weight | 1.76 lb |
| Packed size | 7 x 5 x 3 in |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is eight drivers only. Buy the bushings separately or use the ones included in your rebuild kit.
It is sized for the 4R100. The earlier E4OD shares much of the design but not every bushing size, so some drivers may not match an E4OD bore.
The drivers are POM acetal, which will not gall the aluminum case or pump body or roll the edge of a new bushing if the driver slips.
Only if it is a 4R100, as in the SVT Lightning. Many F-150s used the 4R70W, which takes different bushings. Check the tag on the transmission case.
No. A hammer on a supported housing works, and the drivers also fit under an arbor press for a more controlled install.
