Adapt-A-Case has released new snap ring plier tips for the 6R80/140 transmission.
OTC 0600 Snap Ring/Retaining Ring Pliers - .090
GM 6L80E Transmission Snap Ring Pliers
This is my snap ring pliers
Push-Button Slip-Joint Pliers - Transmission Digest
6R80 ZF6HP26 Snap Ring for the A, B and C Clutches. Alto Number
Remove and install heavy-duty internal snap rings from 2.4375 to 3.5 inches in diameter and external snap rings from 1.5 to 4 inches in diameter. Pliers include 3 pairs of interchangeable points sizes: 0.108 inch diameter 15 angle 0.108 inch diameter 45 angle and 0.123 inch diameter 45 angle. Points lock securely into the jaws. Screw-type design maintains jaw position during use.
GearWrench Combination Heavy Duty Snap Ring Pliers
6 pc Retaining Ring Pliers Set (Red), PRH406
6R140 Archives - Transmission Digest
OTC 0600 Snap Ring/Retaining Ring Pliers - .090