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If you have some feedback on how I could make the first post any more easily understood, please let me know. I'm flabbergasted that you can't read the first few posts in this thread and not have a clear answer.Did some searching couldn't find a positive answer. In need of a diff rebuilt on my tt 6sp, hoping I don't need to do the ring and pinion. Is there any other option besides factory for the ring and pinion? Thought I saw something I could use the ls400 one??
The 220mm vs 200mm is the ring gear diameter. No Lexus model used a 220mm so there's no cheap Lexus replacement for a big diff ring & pinion.
So only a 220mm ring gear will work with its matched ratio pinion in a 220mm casing. You'll need to find a specific TT 6-spd new or used ring and pinion set to repair your diff, if your ring gear or pinion are damaged. The ratios available are 3.13 (factory US spec) 3.26 (93 to 95 JDM TT 6-spd) and 3.54 for some European/GCC market configurations.
If your car is TT and/or 6-spd swapped and doesn't have a big diff, then yes, any of the small diff ratios listed can be used in your diff casing so long as you install the needed new parts (seals, crush sleeve, etc) and of course the ring & pinion are matched to each other for the specific ratio. You can't mix a 3.92 pinion with a 4.27 ring gear, for example.