Hi all, New poster but old lurker. I own a 1964 Rover P5 with a problomatic DG gearbox. it has spent a total of 18 months having the gearbox overhauled. i am now considering changing to a BW35 gearbox. has anyone done this any advice on what to change. can i use the existing bell housing and propshaft? \Any and all advice is welcome.
If you're going to do this you should also beef up the BW35 to V8 spec by adding the extra front clutch plates (from a V8 version) and use a later model valve body or you just may be disappointed with the performance of the transmission. In P5 MK3 stock form the trans likes to go straight to 3rd (direct drive) and stay there. Later model BW35 valve bodies promote part throttle shifts and enhance the driving experience as well as increasing the system pressure and minimising slushy shifts through slipping clutches and bands.
The BW35 in the MK3 runs the smallest of 3 torque convertors, has the smallest diameter input shaft and also stator support. This is not necessarily an issue but some stator supports on MK3s have damaged splines (visibly quite obvious)...so check. They also have a rear pump fitted...P5Bs don't...and the rear mount is also different to a P5B.
I've built several MK3 transmissions for Aussie V8s and have also driven standard MK3s so know how they perform in various guises. As for bolting one up to a MK2 Engine...Phil would be your best counsel as to whether it is a viable option.