Huh, daft question, the primary T case gear is the same in the 1.9 and 2.29 transfer cases? I've bought a T case secondhand for my 61 and it had the small type of speedo gear, this telling me it's from the 7 series, may be a 75, it's a vacuum actuated one. But i haven't checked the gear ratio. I'm pretty sure the Primary gear was the same! If it's different i'd know for sure, i don't want to reopen the Tcase just to check!