They'll be saying "... of course, all 75's and ZT's had reliable BMW engines by then ...". Don't believe everything (anything?) you read on the internet or advertising blurb, even from owners.
TVR did use Dana diffs in some models, and some were LSD, and some the same design as the type fitted to our cars, but Dana diffs were made in OZ, not in Blackpool.
Totally off topic, but the new planned Ford V8 engined Griffith looks a bit tasty, don't you think?
https://www.tvr.co.uk/new-car
David.