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**MDPotter** · 06-17-2020, 06:39 PM

Sounds like the 5.3/4L60 is probably a little worn out. The HP gain between the engines is small, but you don't have to worry about the 4L80 going out as it has much fewer miles and is a stronger transmission.

06-17-2020, 06:39 PM	#4
MDPotter Senior Member Join Date: Aug 2018 Location: Western Colorado Posts: 1,165	Re: Decision 5.3 4l60 or 6.0 4l80 Sounds like the 5.3/4L60 is probably a little worn out. The HP gain between the engines is small, but you don't have to worry about the 4L80 going out as it has much fewer miles and is a stronger transmission. __________________ 1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax