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Well what 5 speed? The dogleg will fit without changing the 521 driveshaft. If a 620 or Z car 5 speed there are some 720s that had a one piece driveshaft but never heard it will fit without shortening so why not just shorten the one you have?

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I have a 620 long tail 5 speed in my 521. I pieced together the driveshaft from a 620 front half and 620 carrier bearing, then the 521 stock pieces from there back. I think Hessianben's thread pioneered that solution. And I had to make shorten my rear tranny mount too. The result is the slip yoke has a about 1.5 inches less engagement, but it's workable.


Had to move the shifter hole back 5 inches or so - still clears my seat fine. Made a custom plate to replace mine. Install of engine/transmission combination is tough in a 521. I installed separately - still learned plenty of lessons.

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