P6 Diff

[ken]

Hi Jonathan

Not to hijack teds tread again

Not sure, but I have an idea that the P6 diff might also have been Salisbury-based if that's any help for parts?


Just got back from my mates engineering workshop with a new quill shaft for fitting the p6 diff to a triumph subframe thought you mite be interested

Ken

[Jonathan Lewis]

Thanks, Ken - interesting. Presumably the set-up also requires a modified flange on the Triumph nosepiece to bolt to the P6 diff?

Regards,

Jonathan

[ken]

Hi Jonathan
yes it an esey one just cut off the square triumph mount and turn down a mild steel bar to the outside diameter of the triumph quillshaft housing press on and weld round drill the six holes in the new housing and bolt on. Apiece of angle iron acrossthe back of the diff with some shocker bushes and some tube for spacers and that mounted driveshaft flanges on the diff have to be redrilled to take the driveshafts with a spacer on the driverside as the diff from the P6 is narrower by 2 inches> I have to get the car up off all four wheels to fit a new flywheel and clutch soon and clean and repaint underneth so ill take some pictures and post them for you

Ken

[djw113uk]

I am just making the spacers to fit a p6 diff into my V8 MK11. The nose piece doesnt look too bad - just the seal may be a nightmare! Ken sorted me a quill shaft before he went, but I cannot remember how he said to harden it. I am currently going to case harden to 40 rockwell - anyone know if that is right?

I think only Ken and Roger Keys (Orange V8 estate) have fitted the p6 diff so far? It seams the only way to get better than 3:45:1 in the UK, unless you go the BMW route?

Any photos or extra details would be much appreciated.
David

[Andy Thompson]

http://www.cheltenhamheattreat.co.uk/

Spoke to Ken - I think this is the place and he said 95 Rockwell

[djw113uk]

They were the guys I had already spoken too! They will check the hardness of the original shaft, and try to make the machined one the same, but are adament that 95 rockwell is way too high and infact unachievable!

Unfortunately they do not remember the job, nor the name

Looks like I will have approx 40 rockwell and see if it is good enough!

Lots of spacers to make before we get that far though!

Thanks

[harvey]

P6 diffs are bad starting point for upgrading something else, as even in their best form they're a very weak unit. They're nothing like a Salisbury, in fact, they're not like anything else I can think of. Behind the 4 cylinder engines they were OK, but that wasn't a powerful engine for it's capacity, but behind the V8 they left a trail of broken planet gears and output shafts lying in their wake.

[djw113uk]

With Ken running a 4.3 V8 and not having broken one yet, it should be good enough for me with only an LPG fuelled, currently carb fed, 3.5V8!

He shredded a number of standard 2.5 units before "upgrading" to p6. I have one so will give it a try. Cheaper than 1k for a BMW!