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I'd go for an 1850 subframe as the best start point. A Sprint one will do too, but you'll probably end up cutting off the bulky and obstructive Sprint engine mounts that aren't ON the 1850 frame. Plus, Sprint frames are more in demand from people wanting to do Sprint conversions. Therefore priced accordingly.
When I did the Carledo, I started with the basic Toledo/generic OHV style of frame with the "long A" extension on the rear. Which I had to cut off and re-engineer to suit the manual box. When I did the Dolomega, I only had to do the front, the cranked and lowered Sprint frame rear section (which is shared by the 1850) missed everything on the much bulkier automatic box (4L30E) which that car is fitted with.
Some BMWs also carry the same GM designed 4L30E transmission, if yours does, have fun with the wiring, I did! Thinking about it, I can probably work up a simplified wiring diagram for that trans from my interactive computer one. If it's a ZF box i'm afraid you are on your own!
And if you need a forward extension on the front crossmember of the subframe, I can send you drawings of how I did mine. It means relocating the front ARB under the tie bars, but still works fine.
Steve
PS, Just noticed, your car doesn't HAVE a front ARB. This is a serious oversight on your part, get one pronto, preferably before the BMW motor is in and running! It will aid enormously in your future survival!
Hi Steve
As in my other posts I have followed your suggestions and fitted both a front an rear anti roll bar, and I must say, I though you were just being over dramatic but it has improved the handle beyond the point I though a family car from the 70s could handle!
Secondly I have got a 5 speed GETRAG manual gearbox and all the bits I am going to try and go manual once I get another subframe to mock everything out on.
Thanks again
Barry