Overdrive Unit

[Kevin H]

Peter,
The guy who rebuilt my engine looked into this and if I remember correctly he concluded that some fairly significant modifications would be required to use that overdrive unit. This included cutting a chassis crossmember and expanding the width of the tunnel that the prop shaft runs through. Neither of these were something I was prepared to do. Given the narrowness of the Bristol and the proximity of the front seats to the tunnel I doubt it was even feasible.

However, this was circa fifteen years ago and the dimensions of the overdrive unit may have changed since then.

Another option would be to change the whole powertrain as Bristol did with the 411 S6. With hindsight I wish I had done that and just stored the original engine and transmission in case a future owner wanted to restore it to original.

Regards,
Kevin