6L80 Banner Rebuild Kit, new and ready to install. Fits the 6L80. Ships fast from the USA.
If your Silverado, Sierra, Tahoe, Yukon, Escalade, Camaro or Corvette has a 6L80 that flares between gears, slips once it is hot or has started leaking past internal seals, and the case, drums and gear sets are still usable, a banner kit is the budget way to put it back together. This is a new kit listed under reference T45004C. It is the most affordable banner-style kit we carry for the 6L80, and it is aimed at the builder who has already torn the unit down and wants the soft parts in one box without paying for hard parts the transmission does not need.
A banner kit pairs the overhaul set (case and pump gaskets, shaft seals, sealing rings and O-rings) with a set of friction plates and a filter. In a 6L80 those are exactly the parts that decide whether a rebuild shifts like new. The 6L80 has no bands. Its six forward gears come from five clutch packs (1-2-3-4, 2-6, 3-5-Reverse, 4-5-6 and Low/Reverse), and the TCM on the valve body times each shift by releasing one clutch while it applies another. Every one of those clutches is fed through sealing rings on the shafts and the pump cover. When a ring wears or a friction glazes, the oncoming clutch fills late, the TCM sees the ratio change take too long, and you feel it as a flare or a slip. Fresh rings, seals and frictions restore the apply pressure and the timing the controller expects.
Not every bad shift is a clutch problem, so rule out the cheaper causes first. Check the fluid level at the check plug with the fluid hot, and look at its color and smell. Pull the pan and see what is on the magnet. A converter shudder alone can come from worn-out fluid, and GM's answer for that is a series of fluid exchanges, not an overhaul. A harsh downshift can be adapts. Low line pressure from a worn pump starves every clutch at once and looks like general slipping. Our 6L80 common problems and fixes guide walks through each failure in the order shops actually find them, and the 6L80 pump failure symptoms guide shows how to separate a pump problem from clutch wear before you spend money on either.
The listing names the 6L80 and gives no year range, which matters because this transmission changed during its run. Plate counts in some packs, filter and seal part numbers, and valve body castings were all revised. Treat this as a 6L80 kit only. The 6L90 in heavy-duty trucks uses a longer case and heavier internals, so do not assume it fits. Before you order, match the T45004C reference against the kit you need, and on teardown count the plates in every drum and compare them with what is in the box before you build anything. If you are not sure, send us your year and VIN, and read the RPO code on the glovebox label (MYC is the 6L80). You can see every part we carry for this unit on the 6L80 transmission page.
| Fits | 6L80 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | T45004C |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
A banner kit combines the overhaul gasket and seal set with new friction plates and a filter. It does not include hard parts such as steels, pistons, drums or gear sets, so inspect those on teardown and replace any that are worn.
The listing is for the 6L80 with no year range. Because plate counts and some seal and filter part numbers were revised during production, match the T45004C reference, count the plates in each drum against the kit, or send us your year and VIN to confirm.
It is listed for the 6L80. The 6L90 uses a longer case, a different output shaft and heavier internals, so choose a kit listed for the 6L90 or for both units.
Dexron VI. Fill through the fill plug, then set the level at the check plug with the fluid at operating temperature.
Yes. Reset the transmission adapts and run the learn procedure with a capable scan tool. A rebuilt 6L80 can shift harshly or flare until the TCM relearns the new clutch fill times.
Only if they are heat-marked, warped or scored. Overheated steels glaze new frictions quickly, so if the old unit ran hot, buy new steels or step up to a kit that includes them.
