Re: What year TR6 did NOT have a differential oil
I have 2 diffs for my irs TR4a, both have just the one plug which is up on the side of the diff and used to fill and drain, by vacuum/siphon.
The back covers of my diffs are alloy, so I drilled and tapped a drain plug in the one that's on the car now. (Can't remember whether the diff of my TR6 was the same; I don't remember ever changing the fluid on that car!)
Simon.