I'm tryign to buy an LSD but I don't know the spline count and the diameter of my axles Also how hard would it be to convert a solid axle set up to IRS?
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You'll need to look at your VIN tag (under the hood, square aluminum tag) and there's the axle code on it. It will read "T342" or something like that; that's the first thing you need to know. As for IRS, it's heavier than the live axle you currently have. You could weld in mounts for it, but it probably wouldn't be worth the hassle.
I'm willing to keep it as long as I can find a drum-disc conversion but I rather have the IRS because I'm finding it really hard to find any suspension pieces for a solid axle
Parts are hard to find? Up here they're a dime a dozen...
As far as a disc rear, I can't remember what fits; I know the gen 2 celicas had a disc rear, but I don't know if it'll fit your style of car.
Ah... it would have been good to mention that in your first post, but that's okay. If you are intent on using the IRS, it has a 7.5" crown gear vs. your current 6.7" gear, and the chances of finding an LSD IRS are pretty good. Cressida sedans came with the same IRS and LSD as well (but not all of them have the lsd), so that should expand your parts availability a bit.
There are only 4 bolts that hold the entire IRS sub-frame to the car; the only fabbing you'd need to do would be provision for shock towers (obviously) and reinforced mounting pads for the IRS to bolt to.
In that case, you'd probably want one out of an '87+ Supra turbo. I really couldn't tell you if there's a difference between turbo and non-turbo diffs, but you could always search the "supra" section of TN for more info.
The T series diff (6.7") in your 3rd gen will not live with 500HP.
If you're willing to stick to 300-350HP then the solution is easy.
The IRS from the RA65 GT-S or the MA61 Supra has an F series diff (7.5") and fits with little trouble.
Cut off your panhard rod bracket, drill 4 holes for the IRS K-frame and bolt it all up.
Those 4 holes must be measured accurately or your car will pull to the side.
GT-S disc brakes are a bonus but require a matching change to the master cylinder (drum brakes use much less pressure than disc, so drum brake cars have pressure restrictors built into the rear circuit).
Wheel stud pattern and track are unaltered.
I've been told that the MX73 Cressida IRS is the same as the MA61 Supra IRS but you would have to verify this yourself.
If the donor car did not have LSD then go to a 4WD shop.
The Hilux (aka pickup, Tacoma, 4Runner) used the F series diff and the 4WD shops have a large range of ratios and LSD for the F series diff.
For 500HP you need the G series diff (8.0").
Luckily these are common under the Land Cruiser (in a large range of ratios and optional LSD) and under the MX83 Cressida (limited ratios and optional LSD).
I've been told that the MX83 IRS is very similar to the MX73 Cressida (and MA61 Supra) but there are small differences.
I'm moderately sure the MX83 IRS will do the job for you but you would have to measure one up to be sure.
4WD shops have a large range of ratios and LSD for the G series diff.
A complete Landcruiser solid axle with a G series diff could be used.
You need to pay a professional to shift the mounts (weld heat distorts the axle tubes but the pro's straighten them up again).
The track is significantly wider than the Celica track but this may be good for you (add Celica GT-S or Supra flares).
The stud pattern is different, so chnage your rear rims or ask the pro shop to change the stud pattern.
4WD shops have a large range of ratios and LSD for the G series diff.
It might be possible to use the RA65 GT-S or MA61 Supra rear end with an MX83 G series diff in the middle.
I'm not sure if the diff housing is the same size.
If it's different then I'm not sure if the half shafts can accommodate the difference.
I'm also not sure if the half shafts will live with power but it shouldn't be too hard to get stronger ones machined up.
Lastly, how on Earth are you getting 500HP.
The 22R will not give that.
Not even in 22R-TE turbo form (which has a stronger block).
A heavily modified 3S-GTE could but then you get all the fun of finding a suitable transmission (in Australia we use the SA61 Corona transmission but you didn't get that in America and it wouldn't be strong enough anyway).
A 7M-GTE or a 2JZ-GTE can make 500HP but they are not an easy fit and the weight distribution is all wrong (cornering becomes lethal).
A modified 1UZ-FE with turbos can make 500HP and fits in the engine bay (I'm doing similar with a 1980 Carina) but it is not a trivial project.
If 500HP is wishful thinking and 300Hp is more realistic then stick to the RA65 or MA61 Supra IRS and keep it simple.
If 500HP is real then go for the MX83 G series diff.
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3rd gen (celica) Rear End help
Also how hard would it be to convert a solid axle set up to IRS?
Ah... it would have been good to mention that in your first post, but that's okay. If you are intent on using the IRS, it has a 7.5" crown gear vs. your current 6.7" gear, and the chances of finding an LSD IRS are pretty good. Cressida sedans came with the same IRS and LSD as well (but not all of them have the lsd), so that should expand your parts availability a bit.
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