What rear diff ratio would I need If i've got TY754vg7aa I used to have a TY754vn1ab I need a rear diff that matches the new gearbox but im not sure what ratio I would need any one that could help me out?

 

should be the same

 

well it's not the same because the rear diff gets very hot and when I did an oil change on the rear diff a lot of metal particles came out of it , and If i accelerate from 1st and 2nd the car shakes a lot in the rear

 

Ratio myth answered!

At last I can confirm 110% after splitting my gearbox ref TY754VG7AA the ratio is 4.111 front diff and 1:1 transfer so needs a 4.111 rear.