4L70E Banner Rebuild Kit 2004-2014

Shoppers looking for this kit usually have a 2004-2014 GM truck, van or SUV that slips into 3rd, bangs into gear, or smells burnt after towing: a Silverado or Sierra 1500, Tahoe, Yukon, Suburban, Avalanche, Express, Savana, Trailblazer, Envoy, Colorado, Canyon or Hummer H3. Those vehicles use the late-style 4L60E, the 4L65E, or from 2006 the 4L70E. This banner kit holds a Raybestos Powertrain friction clutch module together with the gaskets, seals, O-rings, sealing rings, lip seals and the wedge-type pump seal the late case needs. Steels are not included.

What the banner kit does in a 4L70E

In the 4L70E, each clutch pack is a stack of friction and steel plates clamped by a hydraulic piston, and oil reaches those pistons through sealing rings on the input shaft, the drums and the support. When the frictions wear and the seals harden, the pack slips before it locks and the friction lining burns. The Raybestos module replaces every friction plate in the transmission as one matched set, and the seal kit renews every piston and circuit seal, which is the core of a standard overhaul. It is the right kit when the drums, gears and steels are still serviceable.

Symptoms tied to worn frictions and seals

• Slipping or a flare on the 2-3 upshift, the typical sign of a 3-4 pack on its way out
• Second-gear and fourth-gear slip together, which points to the 2-4 band
• Slow or harsh engagement when cold that improves as fluid warms
• Code P0741 or a shudder when the converter clutch applies, often found with general wear
• Dark fluid with clutch lining on the pan magnet

How to confirm it before you buy

Inspect the pan contents first, then rule out the easy faults. On 2006-up 4L70E trucks, Transmission Digest reports the input speed sensor harness chafing against the reverse input drum and setting P0716 or P0717, which can mimic an internal failure. Our 4L70E common problems guide covers those checks along with the line pressure test, which should always happen before new frictions go in.

Fitment

Catalogued for 2004-2014 4L60E, 4L65E and 4L70E units with the three-piece case and wedge pump seal. Some early 2004 transmissions still used the round O-ring seal, which this kit does not include, so check the seal on your pump before ordering. Model year alone is not enough when a vehicle was offered with more than one transmission; confirm the case tag, or send us your year and VIN. Browse matching parts on the 4L70E shop page.

Install notes

• Inspect the reaction sun shell; Sonnax documents stripped and cracked shells in this family, and a failed shell will undo the rebuild.
• Steels are not in the box. Reuse only flat, unmarked steels and measure each pack clearance with them.
• Check the clutch drum and its checkball, and replace bushings while the case is empty.
• If hard parts are worn too, a 2004-2013 master kit covers more of the job in one order.
• Seat the wedge seal with the bellhousing torque, refill with DEXRON-VI and clear adaptive shift values before the road test.

What brand of frictions does this kit use?

The friction clutch module in this kit is Raybestos Powertrain. It comes with a complete set of gaskets, seals, O-rings, sealing rings, lip seals and a wedge-type pump seal.

Does it fit an early 2004 transmission?

Only if that unit has the wedge-type pump seal. GM moved from the round O-ring to the wedge seal during 2004, and the two are not interchangeable. Look at the seal on your pump or send us your VIN.

Are steel plates included?

No. Inspect your steels at teardown and replace any that are blued, warped or scored before setting clutch clearances.

Is this the same as a master rebuild kit?

It covers the frictions and the full seal set, which is the core of an overhaul. It leaves out steels and hard parts such as bushings, so it costs less. Choose a master kit if you already know you need more.

What fluid does it take, and does it need a relearn?

Use DEXRON-VI. After installation, clear the adaptive shift values with a scan tool and drive light-throttle upshifts so the shift timing adapts to the new clutches.

• 4L70E Common Problems and Fixes
• 4L70E 3-4 Clutch Failure: Symptoms and Fix
• 4L60E, 4L65E and 4L70E: What Interchanges and What Doesn't
• 4L65E vs 4L70E: Differences, Interchange and Which Is Stronger
• 4L70E Pressure Control (EPC) Solenoid Symptoms: Read the Amps Before You Buy the Part