hi mate, i think the supra highest gearset out of ma/ jza70 is 4.1 out of ma70 auto non turbo.
all are 3.9/3.7/4.1 - there *might* be a 4.3
The GA70 supra has a 4.54 in the manual and a 4.7 or something in the auto
Obviously the hilux and hiace have short ratios ranging from 4.1 to 4.9 as well if you want. But i think your making a mistake putting something so short in, id stick with the 3.7 - a very nice ratio to have!
You need to find out what diff series you have - is it an A series?
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