My gearbox was pulled out and stripped while trying to find an elusive problem. The specialist recommended using a nomad valvebody when it all went back together. It was going to be missed extra in labour because it was all apart anyway so I went for it. But as said above, it was only worth doing because the rest of the box was like new inside (it must have been rebuilt not long before I got the car). Going from a stock (but great condition) box to a nomad valvebody, I noticed heaps of difference. It felt like it shifted like a race car, held gears longer and better and also had more engine breaking. Mine is a series one auto in a TB42s (carby) gq wagon. Possibly there'd be slightly less noticeable difference starting with a series two box....
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