6L80E 6L80 6L90 Drum Tester 35R / 1-2-3-4 Drum Testing Tool Check Leaks Cracks

6L80E 6L80 6L90 Drum Tester 35R / 1-2-3-4 Drum Testing Tool Check Leaks Cracks

This drum tester is made for 6L80E, 6L80, and 6L90 automatic transmissions, letting rebuilders pressure check the 35R and 1-2-3-4 drums for leaks and cracks before assembly.

Overview

This 6L80E drum tester is a bench tool for checking the 35R and 1-2-3-4 clutch drums used in 6L80, 6L80E, and 6L90 transmissions. It applies air pressure to reveal leaks and cracks that are hard to spot by eye. It is aimed at transmission rebuilders, shops, and DIY builders who want to verify drums before installing them.

Built For Performance

• Tests both the 35R and 1-2-3-4 drums on 6L80, 6L80E, and 6L90 units
• Pressurizes the drum to expose leak paths at seals and piston areas
• Helps catch cracks and porosity before the transmission goes back together
• Bench-friendly design for use during teardown and rebuild
• Works as a pre-assembly check to avoid comebacks after the job

Fits These Machines

• for 6L80 transmissions
• for 6L80E transmissions
• for 6L90 transmissions

On-The-Job Use

• Transmission rebuild benches checking drums before assembly
• Diagnosing clutch apply and leak complaints traced to the drum
• Inspecting used or reman drums before resale or install
• Quality checks in shops that rebuild 6L80 family units regularly

Specs At A Glance

Good To Know

Q: What does this tester actually reveal? A: It pressurizes the drum so leaks at seals, pistons, or cracks show up as pressure loss or visible seepage. That lets you scrap or repair a bad drum before it goes back in the unit.

Q: Can I use it on other GM transmissions? A: It is built around the 6L80, 6L80E, and 6L90 drums listed here, so results on other units are not guaranteed. Confirm your drum style matches before testing.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.