Having said all that, the knock will probably be from the BJ in the compression rod, however I hope that your diagnoses is correct and it is the upright lower BJ.
Alex.
Thank you Will,
Pre-owned gearboxes are in stock however not sure about just a casing so will have to look.
Do you not also require the shaft ?
What year and model is your car.?
Alex.
These are the same ones that I used to supply.
Made in Taiwan, however great quality and superb fit.
Sold over 250 and I only had one issue and that was after being on the car for circa 3 years.
The carbon ones are also worth considering.
Good find Will.
Alex.
Why don't you try it and find out for your self ?
That way you will know for sure, however I doubt if you will have any fitment issues, providing you have the correct wheels and tyres.
Alex.
You have taken a dry comp reading which only refers to compression ie valves, comp rings etc.
What you now require to carry out is a wet reading to establish what wear you may have on the oil rings etc.
Alex.