4T60E Sprag Clutch 1993-95, new and ready to install. Fits the 4T60E. Ships fast from the USA.
A mid-90s Buick, Oldsmobile, Pontiac or Chevrolet with the 4T60E that revs and creeps off the line in Drive, or that seems to drop out of gear in third, often has a worn sprag inside the input housing. This is a new dual sprag assembly for the 1993-95 4T60E, reference A84658B (industry 84724B). It combines the low/input clutch sprag and the third clutch sprag in one stacked assembly, which is the design GM moved to partway through the 1993 model year.
A sprag is a ring of tilted steel wedges between two races. Drive the outer race one way and the wedges stand up and lock; drive it the other way and they lay down and freewheel. In the 4T60E the input sprag carries input clutch torque to the input sun gear in first gear, then overruns when the second clutch takes over on the 1-2 shift. The third sprag works with the third clutch in third and overruns on the 3-4 shift. Because both shifts rely on a sprag letting go on its own, the transaxle needs no precise clutch-to-clutch timing on those upshifts.
Before this assembly, the 4T60 and early 4T60E used a third roller clutch, and GM's bulletin on the change describes heat buildup in that roller area as the reason it was replaced. The 1993 update brought a third sprag, a new input sprag and input sun gear, and a spiral snap ring that holds the input and third sprags together as one unit.
Start with the cheap checks: correct fluid level hot, fluid condition, and stored codes. A sticking pressure control solenoid makes every clutch feel soft, so work through our EPC solenoid diagnosis guide first; the 4T60E and 4T65E share that hydraulic logic. Our 4T65E common problems guide explains how slip in one gear only points at that gear's clutch or one-way clutch. If engagement into Drive is slow rather than missing, read the delayed engagement guide too. On the bench, hold the outer race and turn the input sun gear by hand: it must lock solid one way and spin freely the other. Slip, roughness, or locking in both directions means the sprag is done.
This assembly is listed for the 4T60E from 1993 through 1995. GM's change to the sprag design took effect with February 1993 production, so a very early 1993 unit can still have the third roller clutch and will not accept this part without the matching input sun gear and carrier. Look at what is in your input housing: two stacked sprags held by a spiral ring means this is the right style. The later 1996-2002 version is a separate part number, so match A84658B, compare the old assembly's width and element count, or send us your year and VIN. Browse more parts for this family in the 4T60E and 4T65E collection.
Rebuilding a 1997 or later 4T65E instead? Start with the 4T65E input and 3rd sprag assembly.
| Fits | 4T60E 1993-95 |
| Part type | Sprag Clutch |
| Condition | New |
| Brand | OEM |
| Reference | A84658B |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Only if your unit was built after GM's February 1993 change to the sprag design. Earlier 1993 units use a third roller clutch. Open the input housing: if you see two stacked sprags held by a spiral snap ring, this A84658B assembly is the matching style. If you are unsure, send us the year and VIN.
Yes. It is a dual sprag assembly that combines the low/input clutch sprag and the third clutch sprag, the stacked design used in 1993-95 4T60E transaxles.
The most common sign is no drive or heavy slip pulling away in Drive while manual low still moves the car. A worn third sprag instead shows up as a flare or neutral feel in third gear only.
Replace the input and third clutch frictions and seals, and inspect the races, input sun gear and reaction shell. A new sprag running on a pitted race or a cracked shell will not last.
These units originally specified Dexron III. GM approves Dexron VI for back-service in earlier Dexron applications, so Dexron VI is the fluid to use today. Check the level hot after the rebuild.
