Hello Cian,
CT LBB 2 1977 did not mention TL, however CT LBB 3 1977 has a Technology Chart that can be used.
CT LBB 2 1977,1981 mentions TL for computers only and CT LBB 3 1977, 1981 has another Technology Chart.
CT LBB 5 HG did away with the charts of CT LBB 2 and in theory was used to update the ships built using CT LBB 2 that limited standard hulls to 5,000 tons.
To which I respond with publication history - Starter Traveller, book 2, published 1983 (and also The Traveller Book, 1982), and thus post-HG (1980), utilize the same TL table as LBB3, which restricts drive construction by model letter, not potential. Ship construction was also not updated to follow HG, although there is the rather striking difference that HG places no tonnage restrictions, while LBB2 (and Starter CT, and TTB) does. This forms the basis for my argument that the TL limitations in CT HG are for custom drives rated for over 5000 tons, and do not show an inherent difference between jump numbers, but rather the ability to engineer sufficiently massive jump fields of a particular strength.
Of course, your mileage may vary, and this entire argument just proves that how MM and the rest of GDW wrote CT left a lot of room open for confusing interpretations after the 3I was released.