Originally Posted by Storamin
to be honest about the 535/533 thing... I don't think anybody here has ever dealt with those era cars. you might have better luck at www.bimmerforums.com
haha i own one and iv never even get to do stuff like this
the 3.5 started as a bored out 3.3, when the 3.5 came around the 533 faded off. leaveing esentialy a line in the sand when it comes to your situation, with either a getrag 260/5, 260/6 or 265/6. ( 265 has detachable bell housing) with 2 differant kinds of shift mechanisms, up till ( and including some ) 1986 models they had a sheetmetal mech. using a 2 piece plastic bearing. on the aluminum version came in 86 and later models where the lever and bearing are held to the frame by a retaining ring.
basicly, they are differant simply because of thier age. no real reason that i know of