b44 gearboxs

[petti7676]

hi all ive just built my 3rd new b44 and ive come across a minor issue that ive never had before the crown wheel to diff meshing seems very tight and notchy as ive built 2 of these cars before and in the same way could anybody shed some light on what if anything ive done wrong or have i just not notice'd this on the other 1s . Dont wont to strip my gearboxs as soon as i run the car lol