I purchased an xk 140 DHC and plan to dismantle and restore it. I’m sure I will be asking quit a few questions as there is a tremendous amount of knowledge here and I thank you all in advance. I will start with two questions and I am sure there will be varying opinions. What is the best 5 speed gearbox that would require the least amount of modifications and best front disc break conversion.

 

I got the Brake conversion for my XK140 from SNGBarratt.
On my XK150 I converted to a 5 speed gearbox from Guy Broad ( The Broadspeed direct bold on version ).
For all gearbox conversions you need to go to a diafragma Clutch ( 91/2" ), Therefore redrilling the flywheel is needed.

 

Here in California and just finishing the restoration of a 140. I'm not a wrench, but the Tremec 5-speed was highly recommended (and installed), and upgraded just the front brakes to Brembo discs. I understand the Guy Broad conversion for the gearbox is excellent, but have heard of troubles with the Getrag. Hope this helps.

 

Thank you for the tips, gives me some direction need to find best place to purchase then find an engine rebuilder. I can easily go anywhere on the west coast as I live in Washington