4L70E Clutch Module 2004-2014, new and ready to install. Fits the 4L70E. Ships fast from the USA.
If your 2006-2013 Silverado, Sierra, Tahoe, Yukon or Trailblazer SS with the 4L70E has started flaring on the 2-3 shift, slipping in overdrive under load, or leaving black friction paste on the pan magnet, the clutch packs are worn and the seals behind them have probably hardened. This new clutch module for 2004-2014 units handles both halves of that job in one box. The listing photo shows a carded set of friction packs plus a stack of steels, packaged with a full gasket and seal assortment: pan gasket, valve body and separator plate gaskets, front and rear lip seals, piston seals, sealing rings, O-rings and checkballs. It is new, ships from the USA and carries a 1-year warranty.
The 4L70E builds its four forward gears and reverse by clamping clutch packs and a 2-4 band against two planetary sets. The input housing alone carries three packs, forward, overrun and 3-4, and the reverse input and low-reverse clutches sit behind them. Each pack is alternating friction and steel plates squeezed by an oil-fed piston, so worn lining and leaking piston seals produce the same result: the pack slips, overheats and glazes. Sonnax notes that stock 4L65E and 4L70E units already run a seven-friction 3-4 pack, which is a big part of why the late unit was rated for heavier trucks. Renewing the frictions, steels and every seal together restores that clamping force instead of fixing one circuit and leaving the next one to fail.
Pull the pan and look at what is on the magnet; fine gray paste is normal, flakes of brown lining are not. Then check line pressure and the EPC solenoid current, because Sonnax traces most burned 3-4 packs to low pressure or 3rd-gear oil leaking somewhere in a long hydraulic circuit, not to the frictions themselves. Our 4L70E 3-4 clutch failure guide covers the input housing checkball vacuum test and the 3rd accumulator checkball capsule, and the EPC solenoid guide shows how to read amperage before you buy parts. A new pack in a unit with a pressure leak will burn again.
Catalogued for 2004-2014 transmissions in the 4L70E family, which also covers late-design 4L65E and 4L60E units in GM trucks and SUVs of those years. Within that span GM changed details such as pump seals, input housing pack counts on lighter-duty 4L60E applications and speed sensor hardware, so model year alone does not guarantee a match. Count the frictions in your old 3-4 pack and compare the friction tooth pattern and the pan and separator plate gaskets against the photo, or send us your year and VIN to check. If you only need plates and no seals, the lower-cost 4L70E clutch module without gaskets is the better buy. Every other part for this transmission is on the 4L70E collection page.
With the unit apart, inspect the internal harness where it runs past the reverse input drum; Transmission Digest documents chafing there that sets P0716 or P0717, and a new 4L70E internal wiring harness is cheap insurance. A tired 4L70E pressure control solenoid is the other part worth replacing during the overhaul.
| Fits | 4L70E 2004-2014 |
| Part type | Clutch Module |
| 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.
The listing photo shows friction packs plus a stack of steels on the card, along with the gaskets and seals. Compare the contents to your teardown, and reuse or replace steels that are blued or warped.
It is catalogued for 2004-2014 units in this family, which includes late 4L60E applications, but pack counts and pump seal styles vary. Send your year and VIN or count the frictions in your 3-4 pack before ordering.
A flare on the 2-3 shift is the classic sign of a slipping 3-4 pack, but low line pressure or a leaking 3rd accumulator checkball can cause it too. Fix the pressure loss along with the clutch or the new plates will burn.
GM specifies DEXRON-VI automatic transmission fluid for the 4L70E. Soak the new frictions in it before assembly and check the level hot after the first drive.
A filter is not visible in the listing photo, so plan on buying a new filter for this transmission when you order the kit.
