what are some upgrades outside of a programmer someone could do to a 4L80e, does anyone off a shift kit or performance mods to go with these? a buddy of mine bought an 01 hd 6.0 and was wondering. any info would be great. thanks in advance.
TransGo in South El Monte, California makes the kit, seems like everybody sells it; not hard to install, just messy, especially if you tend to spill stuff like I do.
Superior makes a good one also. (Image has been resized. Click it for full size.)
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