transmisson gear swap

[William craun]

So I understand is the go to guy for rear diff swap is Unitrax but, who are the best installers of tranny gears for the 5th/6th gear swap?

[Steve M]

John Donato at Donato Engineering would be my first call.

RPM transmissions in Anderson, IN would be my next call if John were not available.

[Scot@Prefix]

I recommend RPM Transmissions and D&D Performance

I dont know John Donato, or have had any experience with him, but he is highly recommended by others!

[DonatoEng]

What year Viper and what ratios are you thinking of using ?

[William craun]

What year Viper and what ratios are you thinking of using ?

2008 with stock differential 5th(.8) and 6th gear(.63)