OEM-level 8HP swaps in E-series cars

MR-KRAKA

Specialist
May 23, 2020
66
43
0
"unfortunately n63 flex plate has 9 bolt and n54 has an 8 bolt crank. There is not really an easy way to adapt this unless you make a special flywheel, doable but a lot more expensive" from DomiWorks

I guess I'll search for an N57 8hp70/75 from a seller across the pond
What if you were to grind the rivets off the torque converter and mate/weld the 6hp plate to it? Of course only if they line up correctly. I count 12 rivets on my old 6hp21x I have laying here. If you were to use an adapter I believe you will be needing to shorten your driveshaft as well. On my xi it is a tight fit…
 

TheFixer

Sergeant
Aug 16, 2020
427
303
0
Tennessee
Ride
2008 535i
if you do it I’ll go buy another 5 series and do it to.
If an 8hp falls into my lap I will. I know a few places I can get one cheap.

Crazy though. Three years ago I was wondering about swapping an 8hp in. Hardly anything about it then.

Only conundrum I have is I refreshed my 6hp almost two years ago. Rebuilt the valve body. New mechatronics. New seals. Running xhp on it. The difference was night and day afterwards.

But an 8hp in it..... man it will be even better.

Ugh!