20's do put more strain on our already week trannys however yeah if you don't beat on it and maintain your trans should be fine I have had 20s on a few different cars with no problems
2002 GT, L67 Swap, Tuned, Headers, 3.5 pulley,CAI, 3.29 Gears,
"I was banging 7 gram rocks that's how I roll, Winning I have one gear GO! Epic Winning"