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Tech Forum : auto diff ratio

- BMW E21 Community
   - Tech Forum
      - auto diff ratio
  Posted Saturday, Jan 13th 10:30am [Edit] [Quote] [IMS] [View car]

Post nr. 58


i understand that the standard manual diff ratio on a 323i is 3.45, what does the auto 323i diff have???

i wud lik to know as i am doing a auto to manual conversion and i dun want to end up with wrong ratios

  Posted Saturday, Jan 13th 6:12pm [Edit] [Quote] [IMS] [View car]

Post nr. 144


According to the book, a 323 has a final drive of 3.45:1. However, I may stand corrected
It should be stamped on an alu tag on the diff cover, it will either be 3.91,3.64 or 3.45:1.
The torque converter ratio for the 323 is 1-2.06:1

  Posted Saturday, Jan 13th 6:14pm [Edit] [Quote] [IMS] [View car]

Post nr. 184


Same diff ratio manual or auto on the 323i. Some of the 4 cyl cars had different ratios for the autobox to make up for lack of an overdrive gear, i.e. 318i's ('80 up 320i in the US) had a 3.64 gear in the auto instead of a 3.91. This keeps the revs down at high speeds.
--Dennis

  Posted Sunday, Jan 14th 1:40am [Edit] [Quote] [IMS] [View car]

Post nr. 59


thanx myersport, direct answer

  Posted Sunday, Jan 14th 6:45pm [Edit] [Quote] [IMS] [View car]

Post nr. 284


I found an LSD in an automatic 323i that had a 3.64:1 ratio. Whether this was stock I couldn't tell you, but I would say that it was. Who'd worry about putting an LSD in an automatic?!?


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