MetalupYoAss wrote: ae85 diffs are still alot bigger than ke70 diffs, which again are still bigger than kp diffs
That depends entirely on what model KP you have, the later ones have the same diff as the KE70 and the earlier ones can have the KE70 centres fitted.
If you are after a cheap option, measure up an E code Liteace diff. It is stronger than AE85 (S series) or 86 and Corona (T series) diffs, is already leaf spring and should be damn close to the right width. LSD is basically impossible to find, but then most LSD options for you won't be cheap anyway. If you really want LSD and intend to use a 3T-GTE then Hilux is your best option.
Your gearbox will be a T50 or possibly a K50 if it is cable clutch, if you want to run the 3T-GTE I would recommend a W series box which is what they are fitted with factory.
Callum