d46 rears with 3.36 ratio

i have got truck and its got 3.36 ratio with d46 rears and cat 550
im gonna be pulling super b now in canada.

i have two questions.
1.can i pull super b with 3.36 on hills and not damage anything?

2. or if can i change the gears inside to 3.73 and keep the same rear ends.

last but not least.
or you guys think its better to change everything and get 3.73 with 46s or super 40s.

im not sure if im putting this in right section, sorry if i didn’t because im new.

thank you.

 

sorry, you mean keep it as it is.

 

thanks fir the reply.
im a very safe and patient driver with hills.
i just got this truck and didn’t have money to all these changes yet. i guess ill rin with this setup for now.

 

yup i was thinking to get low pro for next tire change. thanks for all the advice.

 

18sp