All TR8s came in 3.08. Nothing else. The five speed rear end also came in 3.45 and 3.90. The 3.27 was a 4 speed rear end used in TR7 automatics up until late 1980 when they finally switched to the 3.08 five speed rear end used in the TR8s. The 3.08 came in the US spec Rover SD1s, so you might be able to find one of them. Problem with that is swapping the R&P isn't that easy because the crush sleeve isn't available. I've reused the old sleeves before and there are tutorials online if you look hard enough for them. If you really want a 3.08, I have a suggestion. Go find a 80s Mustang GT. 3.08 limited slips were fairly common in them and they are only and inch per side wider. They use the same size rear drums and in fact I have redrilled Mustang drums and used them on a TR8 before. Shoes on both are 9"X1.75". The only real difference is the wheel bolt pattern is 4X108 for the Ford and the TR8 is 4X95.25, or 4X4.25" and 4X3.75". If you want to go real crazy, some Mustangs came with a 2.83. Had a non Posi one here over the summer, but I junked it after I stole the rear disc setup for it. Those are going on a 3.08 Posi drum brake rear end I have now ready to go in a TR8 coupe. I'll sell you a real TR8 3.08 rear end for $400, but you need to find a way to get it from here to there, but at least it will be a bolt in and go. Seriously, just go find a Mustang rear end, grind off the mounts, and make new ones, then have a driveshaft made up for it. Redrill the axles to match the TR8 bolt pattern.