Stage 3 6L80 Transmission Rebuild Kits - Heavy Duty Upgrades

Upgrading Your 6L80 Transmission with a Stage 3 Rebuild Kit

The 6L80 (and closely related 6L90) is a heavy-duty 6-speed automatic transmission produced by General Motors. Introduced in 2006, these transmissions are found in many late model GM trucks, SUVs, and performance cars. Built to handle high torque engines, the 6L80 is a very robust transmission in stock form.

However, many 6L80 owners choose to build up their transmissions to handle even more power and abuse. This is where stage 3 rebuild kits come in. In this article, we'll discuss what's included in a stage 3 kit, why you might need one, and some tips for installing it.

What is a Stage 3 Rebuild Kit?

Stage 3 rebuild kits are designed to upgrade the 6L80's clutching and durability beyond factory levels. They include the following major components:

• Upgraded clutches and steel plates
• High performance bands and band apply pistons
• Reinforced input shaft
• Upgraded pump assembly
• High flow valve body
• Boost valve kit
• Billet intermediate servo piston

These parts replace the OEM components with billet steel, carbon, and high friction materials designed to withstand elevated power levels. The upgraded apply pistons, servo, and valve body improve hydraulic circuit performance for faster, firmer shifts.

When Do You Need a Stage 3 Rebuild Kit?

Here are some reasons you might consider a stage 3 upgrade for your 6L80:

• You have modified your engine for 500+ horsepower
• You regularly tow heavy loads near the transmission's max capacity
• You participate in drag racing or other competitive motorsports
• You want improved shifting performance from your stock transmission
• Your transmission is aged or worn out and needs a complete rebuild

The stage 3 kit's heavy duty components support high torque applications where the stock soft parts would slip and eventually fail. The upgraded hydraulic parts also give you faster, crisper shifts that feel great, especially in performance applications.

Installing a 6L80 Stage 3 Rebuild Kit

Installing a stage 3 rebuild kit is best left to a professional transmission shop or mechanic. The process involves completely disassembling the transmission, cleaning and inspecting all parts, replacing worn hard parts, and installing the new soft parts in the kit. Here are some tips for a successful install:

• Follow a reputable rebuild guide specific to your transmission model
• Check end play and runout on shafts; replace if out of spec
• Inspect hard parts like the case, drums, and shafts for damage
• Replace all seals, gaskets, fasteners, and washers
• Adjust critical clearances per the kit manufacturer's instructions
• Modify pump clearances to optimize flow and pressure
• Adjust line pressure and shift points using an appropriate scan tool

Take the time to properly build the transmission and get all adjustments correct, otherwise you won't see the full benefits of the upgraded parts. Most kits also include detailed instructions to walk you through the critical steps.

Get More Performance From Your 6L80 Transmission

Installing a stage 3 rebuild kit is the ultimate upgrade for building a 6L80 transmission for extreme duty. With quality high performance parts and professional installation, you can push your transmission to handle up to 850 ft-lbs of torque without failure.

Just be sure to match the transmission build to your actual power output and driving needs. Installing heavier duty components than your application requires is wasted money. Work with a knowledgeable builder to select the right kit for your transmission project.

FAQs

What's included in a typical stage 3 rebuild kit?

Stage 3 kits contain a full set of upgraded clutches, steel plates, bands, servo parts, valve body, input shaft, pump parts, and other soft components designed for high torque capacity.

What kind of power can a stage 3 kit handle?

Properly built 6L80 transmissions with a stage 3 kit can reliably handle 500-850 ft-lbs of torque depending on the exact parts used.

Is it easy to install a rebuild kit?

No, installation requires completely disassembling the transmission and replacing all soft parts. This complex job is best left to experienced transmission builders.

Will a stage 3 kit work in a stock 6L80 transmission?

Yes, but the transmission must be fully rebuilt with all OEM hard parts inspected and replaced as needed. The kit alone won't make a worn-out stock trans bulletproof.

How do I know if I need a stage 3 upgrade?

Consider a stage 3 kit if your engine makes over 500 hp, you haul heavy loads, participate in motorsports, or just want crisp, firm shifts from your transmission.