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Discussion Starter #1 (Edited)
Evening all,

This is a post for information purposes for other Alpina enthusiasts. I found the specific detail very hard to find on the internet so here are my findings from real life experience...

I had big gearbox problems with my 6.0 B12 when I bought it despite it only having covered 75000km. I also had the same on my 5.7 B12 after 100000km. I believe this is quite common with these cars.

I searched this forum for answers and got some good help, but I thought I'd add this information for anyone searching in the future.

The B12 5.7 shares the same gearbox as the 750i up until about 07/1998. However after then the gearbox is different and has a different bellhousing. The later 750i (08/98 on) gearbox only is suitable for the B12 6.0.

However it seems from my research that any torque converter from any E38 750i will fit all B12 either 5.7 or 6.0.

I hope this information helps anyone with similar problems in the future.

If anyone needs any more help (for example part numbers) please send me an email from this forum.

Cheers,
Bryn.
 

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That's correct - the B12 5.7 has the ZF 3HP30-A5S560Z - PZ (like the E31 and 750i M73) - the B12 6.0 has the ZF 3HP3ß-A5S560Z - TK which was used only in the M73N
 
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