Approx. how much would it cost to fix a t56 viper spec trans??

[Bosko5.0]

How much would it cost I found one for $450 OBO and the listing say 2 gears out not sure of problem.

How much approx. $$$ would it take to fix it???

I dont know alot about them so I leave it up to you guys for info.

 

[94-302-vert]

I would call D& D or Astro Performance... aren't they both the ones that do good work on the manual trans?