Shop Rebuild Kits →
One of the most expensive mistakes a first-time rebuilder makes is ordering a kit by name, assuming a "master kit" includes everything, and discovering halfway through the rebuild that it has no steels, no bushings, and no hard parts. Then the transmission sits in pieces on the bench while a second order ships. The problem is that kit names are not industry-standardized. One brand's "master kit" is another brand's "overhaul kit," and a "banner kit" from one supplier has frictions while another supplier's does not.
So forget the names for a second and learn the four content tiers. Then match the tier to your job.
The Four Tiers, By Content
| Tier | What's Inside | Buy It When |
|---|---|---|
| Banner / Gasket & Seal Kit | Gaskets, rubber seals, O-rings, metal-clad seals, sealing rings. No frictions, no steels, no hard parts. | Reseal job, valve body service, leak fix — clutches are good. |
| Master Kit (overhaul) | Everything in the banner kit PLUS friction clutches and (usually) steel separator plates, plus the filter. | Standard rebuild — the most common purchase. |
| Deluxe / Pro Master Kit | Master kit PLUS a band, bushings, washers, and sometimes a sprag or modulator. | Full rebuild with worn bushings and band. |
| Master Kit + Hard Parts | Deluxe kit PLUS the parts that wear or break: pump, drums, sun shell, sprags, planetaries. | High-mileage core or a known weak-part transmission. |
The critical line is between the banner kit and the master kit: a banner kit does not include friction clutches. If your transmission is slipping because the clutches are burned, a banner kit will not fix it. You need at least a master kit.
Banner Kit — Seals Only
A banner kit (sometimes "overhaul kit" depending on the brand, confusingly) is the soft-parts package: every gasket, lip seal, sealing ring, O-ring, and metal-clad seal in the unit. It is what you buy when the transmission's clutches are still good and you are fixing a leak, doing a valve body refresh, or replacing seals during a teardown for another reason.
It is the cheapest kit and the wrong one for a worn transmission. If you do not know the condition of your clutches, do not assume a banner kit is enough.
Banner / seal kits
Master Kit — The Standard Rebuild
This is the kit most people actually want for a rebuild. It includes everything in the banner kit plus the friction clutch plates, the filter, and on better kits the steel separator plates. This is what you install when the transmission slipped, you tore it down, and you are replacing the wear items but reusing good hard parts.
Watch for two things when you buy a master kit:
- Does it include steels? Some master kits ship frictions but reuse your old steel plates. If your steels are blued from heat, you need new ones. Buy a kit that includes steels, or order them separately.
- Whose frictions are they? The friction material is the heart of the kit. Raybestos, BorgWarner, and Alto frictions hold up; bargain frictions can glaze early. The brand of frictions matters more than the brand on the box.
Master rebuild kits
Deluxe & Hard-Parts Kits — The Full Build
A deluxe kit adds the band, bushings, and thrust washers, which on a high-mileage core are worn enough to matter. A hard-parts kit goes further and includes the parts that are known failure points on that specific transmission — for example the 4L60E sun shell, the 4L80E center support, or the 68RFE overdrive clutch hub. If you are rebuilding a transmission that failed from a known weak part, you want that part in the box, not a hope that yours is still good.
The rule of thumb: the higher the mileage and the more a transmission is known for a specific failure, the further up the kit tier you should buy. Paying once for the right parts beats paying twice for the rebuild.
Hard-parts rebuild kits
What Almost No Kit Includes
Even a top-tier kit usually leaves out a few items you should order alongside it:
- Torque converter. Almost never in the kit. Reusing a converter on a clutch-failure rebuild dumps the old debris right back into your fresh build. Replace or properly flush it.
- Solenoids and the valve body. If a stuck solenoid caused the failure, no clutch kit fixes that.
- Shift kit / valve body upgrade. Optional, but the right time to install one is during the rebuild.
- Fluid. Kits ship dry. Budget the correct OE-spec fluid by capacity, including the converter fill.
Model-Matched Kits, Ships Same-Day
Stop guessing whether the kit has frictions, steels, or the weak hard part for your unit. gearboxinsider.com lists kits by transmission with the contents spelled out, plus the converter, solenoids, and fluid to finish the job. Free shipping, same-day dispatch before 2pm Eastern, no code required.
Shop Rebuild Kits by Model →FAQ
Is a master kit enough for a full rebuild?
For a transmission with good hard parts, yes — as long as it includes frictions and steels. For a high-mileage core or a known weak-part unit, step up to a deluxe or hard-parts kit.
Why does one brand's master kit cost half another's?
Almost always the friction material and whether steels are included. Cheap frictions and reused steels make a cheaper box and a shorter-lived rebuild. Read the contents list, not the title.
Do I need new steel plates every rebuild?
If the old steels are flat, smooth, and not heat-blued, you can reuse them. Any bluing, scoring, or cone-shaping means replace. When in doubt, buy the kit that includes them.