6L50 Clutch Module

A Cadillac CTS, STS or SRX, a V6 Camaro or a Colorado with the GM 6L50 that flares between gears, slips when it is hot, or has burnt fluid and lining debris on the magnet has worn friction plates somewhere in the case. This listing is a new friction clutch pack module sold under part number RCP96-203, which Raybestos Powertrain catalogs as its 6L50-only friction module for the six-speed rear-wheel-drive and all-wheel-drive unit. It is a frictions-only set: steel plates, seals, gaskets and the filter are not included.

What the friction module does in a 6L50

The 6L50 (GM RPO MYB) has no bands. It makes six forward speeds and Reverse with five clutches: the 1-2-3-4, 3-5-Reverse and 4-5-6 rotating clutches, plus the 2-6 and Low/Reverse holding clutches, with a one-way sprag carrying first gear in Drive. Every shift is clutch-to-clutch, so the control module releases one pack while it applies the next and judges the shift by how quickly turbine speed changes. When a lining glazes or wears thin, the pack needs more volume and more time to clamp, and the module answers with flares, harsh corrections and finally a ratio code.

Raybestos lists RCP96-203 as 35 frictions in seven groups: five 1-2-3-4 plates in the OE-style tan material, four 3-5-Reverse plates, six Low/Reverse plates, and two kinds of single-sided plates each for the 2-6 and 4-5-6 positions (outside-spline and inside-spline), all high-energy except the 1-2-3-4 set. Raybestos marks this module 6L50 only, so do not assume it fits the lighter-duty 6L45 just because the two share a case design.

Symptoms of worn 6L50 frictions

• Slip or no movement in the forward gears while Reverse still works, often the 1-2-3-4 clutch
• Flare on the 2-3 or 4-5 shift, or no Reverse, which can point to the 3-5-Reverse clutch or a cracked drum
• Slip only in fifth and sixth, where the 4-5-6 clutch carries the load
• Gear ratio codes in the P0731 to P0736 range after a road test
• Dark fluid with a burnt smell and friction material on the pan magnet

How to confirm before you buy

Several 6L50 complaints look like burnt clutches but are hydraulic. Sonnax documents that a pressure control solenoid stuck in exhaust gives a flat line pressure near 60 to 68 psi, and GEARS Magazine traced no-forward complaints across the 6L45 to 6L90 family to the number 1 check ball in the 1-2-3-4 circuit. Check the fluid level hot at the check plug, scan for codes, and watch commanded gear against actual ratio. Our 6L45 and 6L50 limp mode guide covers those checks, and the 3-5-Reverse clutch failure guide explains the air test that separates a burnt pack from a cracked housing. If the pan shows heavy lining material, the unit has to come apart and this pack is the right buy.

Fitment

This pack is for the 6L50 only. The listing gives a 2006-and-later range, and Raybestos dates the plates 2007 on. GM built Cadillac CTS, STS, SRX and ATS, the Camaro and the Colorado with the 6L45, 6L50 or 6L80 depending on engine and year, so read the RPO code on the glovebox or spare-tire label: it must say MYB. If it says MYA you have a 6L45 and need a different pack. When in doubt, send us your year and VIN and we will check it. Everything we stock for this unit is on the 6L50 parts page.

Install notes

• Soak every friction in Dexron VI for at least 30 minutes before assembly; Dexron VI is the only fluid the 6L50 should run.
• Keep each group with its position. The single-sided 2-6 and 4-5-6 plates alternate outside-spline and inside-spline, so stack them the same way they came out.
• Inspect the steels for heat bluing and flatness; replace any that are cooked.
• Air-check the 1-2-3-4 and 3-5-Reverse housing before reuse. If it leaks or is cracked, the 6L50 1-2-3-4 and 3-5-R clutch drum replaces it.
• Renew the sealing rings and piston seals at the same time with the 6L50 overhaul kit, then set clutch clearance on every pack and run a fast learn with a scan tool once the unit is back in.

Will this pack fit my 6L45?

No. Raybestos catalogs RCP96-203 for the 6L50 only, and the 6L45 uses different plate counts. Check the RPO code on the vehicle label: MYB is a 6L50, MYA is a 6L45.

Does it include steel plates?

No. It is a frictions-only module of 35 plates. Reuse steels that are flat and not heat-blued, or buy a steel set separately.

Which clutches does it cover?

All five: 1-2-3-4, 3-5-Reverse, 4-5-6, 2-6 and Low/Reverse. The 2-6 and 4-5-6 positions use single-sided plates in both outside-spline and inside-spline styles.

What fluid should I use after the rebuild?

Dexron VI. Soak the new frictions in it for at least 30 minutes before assembly and check the level hot at the check plug.

Do I need a relearn after installing new clutches?

Yes. Clear the old adaptive values and run the fast learn with a capable scan tool so the module relearns fill times for the new packs.

• 6L45 Limp Mode: Causes and How to Diagnose It
• GM 6L80/6L90 3-5-R Clutch Failure: Codes, No Reverse, and the Real Fix
• 6L50 Fluid Type, Capacity and Service Interval