Trans recommendations

[555hp]

Besides upgrading the 4L60E rebuild to 4L70 standards, and tuning the pcm specifically with foreknowledge of the rebuild and its purpose (especially the Tow / Haul mode shift table), my only question would be:
Does your Suburban have 4.10 or 4.30 axles? 4.10 would be enough, 4.30 would be better.
If the axles are 3.73, I'd not tow without the tune, but if you do, keep it out of 4th unless the 4L60E was rebuilt specifically with that in mind.

Thanks! It has the standard factory tow package, which I though was the 3.73.....need to check now.