Quote:
Originally Posted by Daox
If that is not enough, I'll could always try to get my hands on a C59 which has a .725 5th gear ratio. That would bring my rpms down to an almost ridiculous 1360 rpm at 45 mph, or 1960 @ 65 mph. I'm thinking that that is a bit too low though. However, the C65 would probably be a perfect match as it has a .815 and .725 gear. But, those typically cost a ton and are pretty rare.
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They're not rare, but they aren't junkyard parts you'll be able to find for cheap. Monkeywrenchracing carries the European C6x with 3.9 final drive and 0.725 6th, which brings cruising rpm down to ~2400rpm at 60mph, and they run 1600 for a used one. There's a guy who imports them from the UK for 1200 or so on Spyderchat (but you'll have to convert the shift linkage back to the usual FWD one).
If I were to replace my C56 right now it would be with a 4.5 FD C60 maybe with a slightly taller tire, or maybe not. I have to cope with hilly city driving so short 1st gear is really useful. For a highway cruiser, 3.9 FD + oversized tire is the way to go.
I have no idea if the 3.7 would go into the 5 speed gearboxes but if you have the ability to open them up and do it that would be worth a shot. I have never heard of a 3.7 C56, I thought they only come in 3.9 and 4.3 flavors. The 4.5 and those 2 are interchangeable.