740 & 760 FWD 5Cyl to RWD to fit 740

Just out of curiosity I've recently gone a different way in my build an wanted to try find out some information needed to convert a b5204t FWD to RWD for my 740 wagon yes I'm aware there will be a lot of modifications to fit that doesn't phase me more along the lines of what gearbox etc would be best to run as won't be auto an it won't be running stupid amounts of power or anything if anyone has some insight on this I would appreciate it.

Comments

  • RobRob (@Rob) - Lockyer Valley, SE Qld
    M90 is I bolt up manual but unicorns are easier to find.
    ________________________________________________
    Current: 1966 120 wagon, 1970 162, 1973 164E + supercharger, 1998 C70 T5 AWD Coupe, 2008 XC70 D5 LE
    Previous: 2001 C70 LPT Convertible, 1979 242GT, 1980 262C, 1984 265GLE, 1985 740T, 1996 850R, 1996 850AWD .... among others
  • SpacSpac (@Spac) Canberra-ish.
    edited February 13
    Realistic choices that I am aware of, in addition to the M90:

    1. BMW box : https://ozvolvo.org/discussion/10019/

    2. T5 or T56 on an adapter plate behind a 960 bellhousing.

    3. Toyota W57 or R154 on an adapter plate behind a 960 bellhousing.

    The adapters exist because the 960 uses the same auto as a bunch of RWD Toyotas.
    egadsEx850R
  • Just out of curiosity I've recently gone a different way in my build an wanted to try find out some information needed to convert a b5204t FWD to RWD for my 740 wagon yes I'm aware there will be a lot of modifications to fit that doesn't phase me more along the lines of what gearbox etc would be best to run as won't be auto an it won't be running stupid amounts of power or anything if anyone has some insight on this I would appreciate it.

    Why not a b6304 that just bolts in?
    with even a DIY ems system like a MS1V3 you can still easily get more than 150kw at the wheels with very little effort

    Trans wise, CD009 with adapter is an easy bolt in conversion and will be something that your pretty much never going to break

    B5204t (not sure why you want the small displacement one....) needs a welded/custom pan and a pile of other stuff as well as much more limited choice for aftermarket ECU,
    I think you need to add i was in an s80 with three wheels getting pulled backwards and was told to "hold on shit is about to get real".
    bgpzfm142
  • GhettobirdJulian (@Ghettobird) Melbourne - SE Suburbs
    B6304 near drops in if you have mounts.

    Wiring, tailshaft and linkages (if auto) are your biggest hurdles if staying with the 6, otherwise sump, pickup and waterline become issies with the 5.

    You also need to think about the intake as the big'Ol swirly boi that comes on the N series engines will never fit.

    Its been done and is usually very well documented.

    6dJJxPbh.jpg
    bgpzfm142Spac
  • appreciate the information this is great the main reason to do b5204t is I have an engine just sitting in my garage doing nothing an figured I love the sound of a 5cyl an would like to try it in my 740 , I have herd the m90 is very hard to find but ill be sure to do some research on the other gearboxs an adapters mentioned before I attempt to fit it
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    M90 were recently brought in by Mark Iceton, he works at Berry motor group Mitcham Victoria.
    He is over in UK later this year so ask him about a box, way less hassle with M90.
    cancer sucks
  • GhettobirdJulian (@Ghettobird) Melbourne - SE Suburbs
    To swap in the 2.0l 5 cylinder would be a waste of time, its a huge amount of work only to achieve a slight power increase, when going for a turbocharged application would yield significantly larger gains for not much more $
    Having an engine is one thing, but having the ECU and ways to manipulate it are worth a lot more than just the engine
  • I may be wrong but if you swap the crank in from a 2.3 litre you'll achieve that displacement as I think the pistons are shared b/w 2.0 and 2.3 litre. A 2.0 litre just doesn't have the torque needed for high performance with this weight of car without a lot of high tech solutions ie supercharging and turbocharging combined

    As a daily cruiser it would be ok I guess and definitely different
  • Ex850RSnoopy (@Ex850R) Somewhere Over the Rainbow. Melbourne.
    2.5 is what you want for torque
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