Need help deciding
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
I get 30 plus years out of my 700R4 that run's 1.45 60ft's and I wont have to worry about the 4L65E lasting as long.I have never run across anyone that has had 6 or 7 failures with a 4L65E as friends 6L80 has had
Race Director
Joined: Jul 2005
Posts: 12,037
Likes: 3,573
From: Central MO
Then you haven't talked to forced induction truck guys that had 4L60/65Es. Again, getting all that weight moving with FI full torque right off the line is the big issue that tears them up, no matter how well you build them. Cars are not a big problem. It was in my opinion GM's poor engineering choice to put a 4L60/65E in a heavy truck in the first place.
Race Director
Joined: Jul 2005
Posts: 12,037
Likes: 3,573
From: Central MO
You weren't, I was. 6L80 holds up better in heavy weight vehicle applications; 4L60/65 isn't bulletproof in that OEM application. The information is still relevant for people to see. Many of us have a truck as our DD.
