6 speed swap advice
I have a lovely condition 2006 156 JTS which I have just rebuilt the cylinder head of & it's running really sweet. The power is very linear & it pulls really well. Hardly surprising that it feels better as half the valves were not sealing & it was probably about 50% clogged with soot/gunge too. It's done 116k miles & this was first time the engine had been apart. Some evidence of cam wear, but bores were "too good". Still crosshatching visible. Guessing thats why these things use oil.
As a daily car it is great with 2 exceptions. Cheap aftermarket lowered suspension which I will replace with something nearer stock when I can. The second item is the gearing. Wow, is that 5th gear low. I've done some research & understand that the diesels & some later cars used the GM F40 6 speed found in Vectra, Signum & Saabs. I also understand that there are 2 variants of that box, the earlier MT2 & the later MU9. In respect of ratios, the earlier box is very tall with overdrive 4th, fifth & sixth. In fact it gives an appx roadspeed equivalent in 4th to my current 5 speed's top gear. I did some geek maths & although it would make a phenomenal cruiser, they may be a bit too tall for everyday enjoyment. The MU9 from 2006 however has a 5th that is slightly taller than my 5th, but has a usefully longer 6th on top. So from a ratios perspective seems the best of both worlds.
Of course on paper that's fine, but what would be useful is understanding whether the bellhousing & driveshafts will work & whether there is a particular donor car that would be a best match to fit the JTS engine & the 156 fixings. Gearbox/final drive to body fixings I can fabricate, but if there are major clearance issues or customs driveshafts required or if there are terminal mismatches, I don't know & can't seem to find on searches.
Be really pleased for any advice which may help on this. The boxes are so cheap secondhand that I am tempted just to get one to offer up, but if I know what donor car is best suited it could save me a lot of hassle.
Many thanks in advance.
Mark N 2006 156 2.0 JTS
Last edited by ripsnort40; 16-05-16 at 14:10.
Reason: corrected mistake