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Well this vendor that didn't radius the splines forgot to do it as far back as 1995/1996 on 4l65e's too. It sounds like to me this sun shell problem has been going on in GM's for nearly 20 years!!!! I was told that they were just starting to heat treat them back then. The problem w/ GM and excuses for crappy vendor products (sun shells/speedo clusters/etc.) is justy poor quality control and making crap as cheap as they can get away with.

No I don't believe it does, it just goes into over drive at a higher RPM. Don the only thing i've noticed tow/haul does is hold the lower gears to about 2500 rpm under steady throttle before shifting, enabling you to apply more throttle while under acceleration w/o downshifting as easily. I have noticed zero benefit of tow/haul when engaged in 4th gear(od). I think it is a good idea but really a manual shift mode would be way better in my opinion. The current generation HD's and mega-dollar GFM rides seem to be the only people who get that feature and ironically, probably are the vehicles which need that feature the least...