Final Drive Ratios
Discussion
I have a 645ci 6spd manual with a 215k diff housing and a final drive ratio of 3.23.
I would like to install a shorter final drive, for example a 3.73 ratio, which is available in an E53 X5.
My question is will the final drive gearset from a 3.0d X5 (E53) fit in my 645ci (E63).
This link: https://www.bimmerfest.com/forums/showthread.php?t...
....suggests that an X5 4.8 diff is a straight swap into a V8 6 Series. I can't find any literature to ascertain which diff sizes the diesel X5 uses, or if that is even relevant given I intend on swapping FDs only.
Anybody more clued up than me able to offer guidance?
(I could seek an X5 4.8 diff but a 3.91 FD is a bit too aggressive, the 6series in the link is an auto with a standard 3.46 FD)
I would like to install a shorter final drive, for example a 3.73 ratio, which is available in an E53 X5.
My question is will the final drive gearset from a 3.0d X5 (E53) fit in my 645ci (E63).
This link: https://www.bimmerfest.com/forums/showthread.php?t...
....suggests that an X5 4.8 diff is a straight swap into a V8 6 Series. I can't find any literature to ascertain which diff sizes the diesel X5 uses, or if that is even relevant given I intend on swapping FDs only.
Anybody more clued up than me able to offer guidance?
(I could seek an X5 4.8 diff but a 3.91 FD is a bit too aggressive, the 6series in the link is an auto with a standard 3.46 FD)
Bmw fans.Info
Go to parts catalogue, select model or enter last seven digits of the VIN. Navigate to required menu (diffs are in "Rear Axle" group. Click on the number next to the item on the graph and a small arrow appears - click on it and it will navigate you down to the corresponding row in the table below. There you çan see the ratio, weight, guideline price (select EUR for that to work).
If you click on a button with a letter "I" you will get more info on the part usage, across all BMW models.
Go to parts catalogue, select model or enter last seven digits of the VIN. Navigate to required menu (diffs are in "Rear Axle" group. Click on the number next to the item on the graph and a small arrow appears - click on it and it will navigate you down to the corresponding row in the table below. There you çan see the ratio, weight, guideline price (select EUR for that to work).
If you click on a button with a letter "I" you will get more info on the part usage, across all BMW models.
Gassing Station | BMW General | Top of Page | What's New | My Stuff