David L. Pulver stated several things about the 3e version of Ultra-Tech ("gadgets were pushed forward a TL or so just to give me something useful to prevent the TL11-16 chapters from being too empty!") and how its TL's convert to 4e.
"Theoretically and very roughly:
upper half 3eTL7 = TL8
3eTL8 = 4eTL9
3eTL9 = 4eTL10 and some TL9-10^
3eTL10 = 4eTL11 and some TL10-11^
3eTL11 = 4eTL11 and some TL10-11^
3eTL12 = 4eTL11 and TL10-11^
3eTL13 = 4eTL11 and TL11^
3eTL14 = 4eTL12 and some TL11-12^
3eTL15 = 4eTL12^
3eTL16 = 4eTL12^
A few individual items drop or gain in TL."