Quote:
Originally Posted by jonwilli
I'll be interested to hear your thoughts on the 3.91 diff. I currently have a 3.91 diff from a 328xi coming from the US to the UK to fit to my E81 130i.
|
Hey mate, mine is finally done! Definitely more responsive and pulls harder. The gearing suits mountain roads sooo much better! I'm loving it!!!
It was more complicated to install that I expected. The 130i has the dual guibo tailshaft, whereas the e93 325i has the uni joint at the end of the tailshaft. I thought it was as simple as swapping the diff input flange off the 130i pinion onto the e93 pinion, but it turns out that the 130i pinion has an aligning pin that sticks out the end and goes into the guibo to keep it perfectly centered and prevent vibration.
Sooo, the solution was to swap the back half of my tailshaft to one that has the uni joint at the end. The e82 125i tailshaft is best for that as it's still e8x therefore is the correct length, and the measurement from the CSB to the 188 diff flange is consistent. Then just get the 130i front half & the 125i back half balanced together & install!
Does the US 328ix have a guibo at the back end of the tailshaft?