Tight fitting 22 gearbox

[martgifford]

I checked my car over the other day and it was a bit if a mess. I was changing screw to stainless and noticed on reconstruction how tight the gear box was even when backing of the screws. I flushed it, cleaned it and it's almost like when the gear ox is out of the carit is fine. In the car the chassis seems to tighten it so its no longer smooth but tight and a bit of a dog. , mid motor 22 any ideas
Thanks