Interchangeable disc driver set for seating bushings and bearing races on 4L80E and other transmission rebuilds, sized 18mm to 74mm in 1mm steps.
A dedicated 4L80E bushing kit covers the stock sizes, but a builder who also works on 4L60Es, 700R4s, axles and hubs needs something more flexible. This set carries 49 steel discs from 18mm to 74mm in 1mm steps, a quick-connect shaft with a handle, and a fitted case. It is aimed at 4L80E and 4L85E overhauls from Silverado and Sierra 2500 and 3500 pickups, Express and Savana vans and Suburbans, and it handles bushings, bearing races and seals on the rest of the drivetrain too.
The 4L80E carries more bushings than most four-speeds because it is really a TH400 with an overdrive section added on the front. The pump, the stator support, the drums, the case and the extension housing all ride on bushings, and the clearance of each one controls how much oil leaks out of the circuits that run through them. Worn bushings are one of the common reasons a high-mileage 4L80E loses pressure. With 1mm steps, you can choose a disc that sits right on the edge of the bushing instead of a socket that only touches part of it. As examples, Sonnax publishes a housing bore of 2.129 in (about 54mm) for the 4L80-E case bushing and 1.244 in (about 31.6mm) for the front stator support bushing; both land inside this set's range.
Low pressure on a 4L80E can also come from the pressure control solenoid or a worn AFL valve, so diagnose before you buy parts. Our pressure control solenoid guide covers the electrical side, and the Sierra 2500 4L80E problems guide shows how pressure and heat failures build up in a working truck. Once the unit is apart, measure every bushing against its shaft and replace any that are scored, tapered or out of round.
This is a universal driver set, so fit is about size, not model year. The listing calls out the GM 4L80E and 4L85E (1991-2009 trucks and vans), plus 4L60E, 700R4 and 4L60 case and stator bushings, and axle bearing races, wheel hub seals and pinion seals on cars and light trucks. If a bushing, race or seal falls between 18mm and 74mm, there is a disc for it. Measure the outside diameter of the part you are installing and choose the disc that is just under it, so the disc follows the part into the bore without binding. For parts that fit only the 4L80E, use the 4L80E parts collection.
| Disc count | |
| Size range | |
| Material | |
| Shaft | |
| Fitment | |
| Included |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The discs run from 18mm to 74mm in 1mm steps, which covers the common 4L80E bushing sizes. A dedicated 11-piece kit has stepped pilots for each location, while this set trades that for range across many transmissions and axles.
Yes. The listing notes the discs fit under a shop press for the tighter interference fits, which is the better choice for steel-backed bushings and bearing races.
Measure the outside diameter of the bushing, race or seal and pick the disc just smaller than that. It should cover the full edge of the part without being larger than the bore.
Yes. The listing calls out 4L60E, 700R4 and 4L60 case and stator bushings, and the same discs handle axle bearing races, hub seals and pinion seals.
Dexron VI ATF. GM specifies DEXRON-VI for the 4L80E in its later owner manuals, and that is what we recommend for a rebuilt unit of any year.
