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Originally Posted by serialk11r
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).
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Yeah, I checked car-part.com and the cheapest one in the US is about $400. Too rich for my blood when you can get a C5x for around $100. It would be pretty nice though.
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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.
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I'm pretty sure all the C5x transmission cases are the same, so you can swap any final drive from one to another. I'm just not 100% sure the auto differential gearing can be swapped, although I am assuming so. I'll be confirming that soon.