ORIGINAL: heavyaslead
Looks like original Tiger gearboxes! You will like the scale ~32mph the TU's give for this model.
Also liked the strengthening bar you installed, I'm sure it will help.
i beleive they are the "Sports" version from the King tiger

and yes they do move it quite nicely big thanks to paul "Septon" for those
many thanks for the comments keep em coming this is a trial and error build