Quote:
Originally Posted by smassey321
Regarding the rear difs, the 3.15 for the 5.0 has a different part number than the 3.15 for the 3.0. This may be due to the larger axle shafts on the 5.0. Some of us diesel people are considering a 3.15 dif swap to get better highway MPG. A 3.15 dif alone will lower the highway RPM 50% compared to the 8 speed/3.15.
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Where are you getting the 50% number from? By my math, it’ll lower our highway rpm by 15.5% from our 6 speed/3.15. I was under the impression that that would put us very in line with the engine speed of the f15/ 8 speed.
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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years
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