The advantage of the W57 and W58 Toyota 5-speed gearboxes are that these have been used in any number of applications and Dellow can supply the correct gearbox top; which simply bolts on and interchanges with whatever “top” the gearbox you’ve purchased comes with… the correct measurement is 58cm from the flat of the gearbox housing to the center of the gear stick for a P6B; Dellow have a small surcharge for swapping your “top” for the correct one and they’ll have one on the shelf
I bought the conversion kit from Dellow ( Speedo cable/bellhousing, throw out arm, Toyota driveshaft stub, slave cylinder, clutch/pressure plate ) but their price for a Toyota 5-speed was a bit rich and that I sourced privately
Some considerations: Dellow can supply the correct speedo cable for Toyota/P6B as part of the conversion which is accurate plug-and-play
You will need to fabricate a crossmember and shorten/balance the driveshaft which has a unique “phase” with the universals in the P6B ( machine shop will know )
When shopping for a gearbox the metal sandwich in the middle of the gearbox where the horizontal bolts hold it together can be steel or aluminium, the steel spacer makes for a stronger gearbox and won’t cost you any more than an alloy one
W57 and W58 can take 300 horsepower for decades and endure enormous amounts of abuse without self-destructing and these only weigh about 30kg
A Toyota clutch, throwout bearing, slave cylinder and pressure plate worked fine with my Roverish/P76 Leyland manual flywheel ; once the pressure plate was on I had the flywheel balanced as an assembly as I’d had the engine balanced
Its a bit of messing around but a nice conversion
G