6L45 Master Rebuild Kit 2007-2017, new and ready to install. Fits the 6L45. Ships fast from the USA.
If a BMW with the six-speed automatic is slipping out of first when cold, flaring between gears, or showing burnt fluid and clutch material in the pan, the fix is usually a full overhaul rather than one more solenoid. This master rebuild kit is built for the 6L45, the light-duty member of GM's Hydra-Matic six-speed rear-drive family, and it is catalogued for the version BMW installed as the GA6L45R in 1 Series, 3 Series, 5 Series and X3 models. It brings the soft parts for a complete rebuild in one box: friction plates, steel plates, the gasket set and the seals and sealing rings, and the kit pictured also carries molded pistons.
The 6L45 builds six forward gears from five clutches and a low one-way clutch, all switched by solenoids in the transmission control module bolted to the valve body. First gear uses the 1-2-3-4 clutch, and that clutch stays applied through fourth, so it carries more of the work than any other pack in the unit. When its frictions glaze or a piston seal starts leaking, the transmission slips moving forward or loses drive when cold. A rebuild kit lets you renew every friction and steel, every lip seal and sealing ring, and every gasket at the same time, so the clutch packs are matched and every circuit holds pressure again. In a 2010 Cadillac CTS 6L45 no-forward case written up by Transmission Digest, the repair shop ordered a rebuild kit with all new molded pistons along with an updated clutch drum, which is the kind of complete job this kit is meant for.
Not every no-forward on this family is a burned clutch. The number 1 check ball in the upper valve body sits in the 1-2-3-4 clutch feed circuit, and if it wears small or blows through the spacer plate the clutch cannot hold pressure even with good frictions. Solenoid and TCM faults and a failed low one-way clutch cause similar complaints. Read the codes, check the fluid level and condition, and pull the pan: heavy friction material and metal mean the clutches are gone and a rebuild is the right call, while clean fluid points toward the valve body. Our 6L45 limp mode guide walks through the codes and pressure checks, and the 6L80 no-movement diagnosis applies to the 6L45 as well since the circuits are shared across the family.
This kit is listed for the 6L45 for 2007-2017 and is catalogued for the BMW-installed GA6L45R in 1 Series, 3 Series, 5 Series and X3 models of roughly 2006-2011. Not every BMW in those lines used it; many got a ZF six-speed instead, so check the tag on the transmission case before you order. GM also put the 6L45 (RPO MYA) behind Cadillac engines, and GM lists separate RPOs for the 6L50, 6L80 and 6L90 with parts that are not interchangeable, such as the upper valve body. If your 6L45 is in a Cadillac or you are not sure what you have, send us your year and VIN and we will match it before it ships. Other 6L45 parts are on our 6L45/6L50 transmission page.
Inspect the hard parts before you assemble: the 1-2-3-4 clutch drum and its welds, the pump bushing and gears, the sun gear and hub splines, and the low one-way clutch. A cracked drum or worn pump will undo a new kit, so replace them now if needed; we stock a 6L45 clutch drum (match it to the drum you are replacing) and a 6L45 pump. Soak new frictions in fresh fluid, set clutch clearances to spec, and air or vacuum test each clutch circuit before the valve body goes on. Replace every check ball while the valve body is apart; a worn number 1 ball causes the same no-forward you just rebuilt to fix. On BMW-installed units, the 6L45E BMW filter and pan gasket kit gives you a fresh filter for the fill. Fill with the ATF specified for your vehicle, Dexron VI on GM applications, check the level hot with the engine running, then run a clutch relearn with a scan tool so the control module adapts to the new frictions.
| Fits | 6L45 2007-2017 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is catalogued for the GA6L45R six-speed in BMW 1 Series, 3 Series, 5 Series and X3 models of roughly 2006-2011. Some models in those lines used a ZF six-speed instead, so check the transmission tag or send us your VIN.
The kit is catalogued for the BMW-installed unit. If your 6L45 is in a Cadillac, send your year and VIN before ordering so we can confirm the clutch pack and seal match.
The kit covers frictions, steels, gaskets and seals, and the pictured kit also shows molded pistons. Order a filter separately; we carry a 6L45E filter and pan gasket kit for BMW applications.
Inspect the 1-2-3-4 clutch drum for cracks, the pump, bushings and the low one-way clutch, and replace all valve body check balls. A shift kit is optional if you want firmer shifts.
Yes. Clear the old shift adaptives and run the clutch fill relearn with a capable scan tool so the control module learns the new clutch packs. Skipping it can leave harsh or flared shifts.
Use the ATF your vehicle calls for. GM applications take Dexron VI. On a BMW, use the fluid specified for that car, and set the level hot with the engine running.
