OK here's a basic description of what and how i did the conversion. Purchased Corona RT142 IRS, dropped out existing diff (obviously), IRS came with back half of tail shaft which just happened to bolt up to front half of my Celica tail-shaft. Tried jacking complete IRS into position but realized that lower control arm mounts on car were in the way so I removed them. Once again tried but still needed another 15-20mm so IRS mounted up past sill height so cut out where the lower control arm mounts used to be as pictured and will box out this section.





Once again tried to jack into position but now fouled the chaise rail by about 5mm. Rather than cutting into the chaise rails decided to modify the IRS front/main cross member by cutting sections out and boxing back in as pictured.





With this done it full filled the height issue. Next cut away pan hard bar mount as no longer required and added in two pieces of flat plate where the pan hard bar chaise rail joined the two main chaise rails then added two box sections to mount the diff cross member to as pictured and also some angle as pictured in second photo below which holds main cross member in place.





Next was the springs. At the moment it has cut celica springs in it which don't fit properly as the RT142 spring is a larger dia than RA40 so I'm having some custom ones made at the moment. But even with them as low as they are it still rides really nice but have some real issues with camber and ground clearance. New springs will be around 25-30mm taller.



A couple of things to point out,
1 - Using Cressida 4.1 ratio diff, ventilated disc's and calipers over Corona 3.7 ratio, solid disc's.
2 - Diff cross member is Cressida.
3 - RT142 wheel track 1350mm, RA40 1350mm
4 - Using Corona main cross member as Cressida, although it uses same mounting position, its track is wider (but may be OK?).
5 - Corona complete IRS (minus one caliper) cost $300 from local wrecker and the Cressida cost $350 from a different local wrecker. All other modifications were made by myself so only my time and the cost of some brake lines and new springs.

Going to pull it out this weekend and tidy up so I'll take some more detailed photos. Any questions please shoot.
Neil.

[Updated on: Wed, 29 June 2005 13:45]

1gt48u wrote on Thu, 30 June 2005 10:56

very nice Neil - worth every minute of lying on a cold garage floor by the way your springs are ready so pay me bitch cheers

It wasn't cold on the garage floor the day before when the fuel line laying on the ground caught on fire, that was warm and exciting.
How's that for quick, springs now paid for.
Now be a man and get yourself a real car, you know, ONE DIFF.

[Updated on: Thu, 30 June 2005 02:42]