4L70E Master Rebuild Kit 2007, new and ready to install. Fits the 4L70E. Ships fast from the USA.
When a 2007 GM truck or SUV with the 4L70E is slipping into third and fourth, flaring on the 2-3 shift, or showing black, burnt fluid with clutch material in the pan, a fluid change will not bring it back. This Raybestos master rebuild kit is built for that overhaul. The photo shows a full-scope kit: friction and steel clutch packs, a band, bushings, and the seals, pistons and hard parts that come with a complete reseal. It is the parts side of a teardown where every clutch pack is renewed and every seal is replaced at once.
The 4L70E is GM's heavy-duty member of the 4L60E family, the unit GM's own owner manual calls the 4L70-E Super Duty. It uses the same layout of forward, overrun, 3-4, reverse input and low/reverse clutches plus the 2-4 band, so a worn unit usually shows damage in more than one place. Sonnax's catalogued complaints for the 4L70E lead with burned 3-4 clutches and a burned 2-4 band, followed by no lockup, TCC slip, low line pressure and wrong gear starts. A master kit addresses the friction and sealing side of all of that in one order, instead of buying a 3-4 pack today and a band next month.
A rebuild only lasts if you find why the clutches burned. Sonnax traces most burned 3-4 clutches in this family to third-gear oil leaks rather than to the friction material itself. Their recommended checks include vacuum testing the input housing checkball, which should hold 25 in-Hg, air checking the housing bores, and looking hard at the 3rd accumulator checkball capsule. Converter slip is another source of heat that damages clutches. Our 4L70E 3-4 clutch failure guide walks through those tests, and the delayed engagement guide covers the pump and seal checks for slow engagement.
This kit is listed for the 2007 4L70E. In 2007 the same family was also built as the 4L60E and 4L65E, and the stronger versions use different clutch counts and some different hard parts, so read the tag on your case before ordering and count the plates in each pack on teardown against the kit. If you cannot read the tag, send us your year and VIN and we will confirm. Other years and kit levels, including the 2004-2013 4L70E master rebuild kit, are on the 4L70E collection page.
Two parts commonly bought alongside this kit are the 4L70E pump, since a worn pump starves every clutch you just installed, and the 4L70E valve body for 2006-2013, which replaces worn bores that cause many of the pressure complaints described above. If the 2-3 flare started with a lockup complaint, the 4L70E TCC solenoid and harness is worth replacing while the unit is apart.
| Fits | 4L70E 2007 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | Raybestos |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
As pictured, it is a Raybestos full-scope kit with friction and steel clutch plates, a band, bushings, seals and piston and hard parts for a complete overhaul. If you need the exact piece list confirmed for your build, contact us before ordering.
Not necessarily. The versions share a layout but differ in clutch counts and some hard parts. Confirm the tag on the case, or send us your year and VIN.
No. A master kit covers clutches, seals, gaskets and related wear parts inside the transmission. Have the converter serviced or replaced separately, especially if the unit failed after converter slip.
Sonnax traces most 3-4 burns in this family to third-gear oil leaks, such as a leaking input housing checkball or worn bores. Find and fix the leak during the rebuild, or new clutches will burn the same way.
GM specifies DEXRON-VI. The 5.0 quart figure in the owner manual is for a service; a fully dry transmission and converter take more. Check and set the level with the fluid hot.
