Request and help to upgrade ratios of gm SM 465 Manuel 4 speed transmission

[saleh509]

Dear all

I have gmc truck 2wd and has gm sm 465 transmission 4 Manuel speed

The factory gear ratios are

1st : 6.55
2nd : 3.85
3ed : 1.70
4th : 1.00
Reverse : 6.:09

I would like to upgrade the ratios without and change in the main transmission body just need to change the rings inside the transmission

The ratios that I would like to have are

1st : 3.27
2nd : 1.97
3ed : 1.34
4th : 1.00
Reverse : 6.:09

So the changes will be only in 1st , 2nd and 3ed

Please note that the tire hight is 33 inch
The rpm up to 6200 rpm
The rear end ratio 3.73

I need help on that

Regards