low ratio diff

[bodger]

im currently using a 3.64 diff on m 325 but as i do alot of motorway miles i want a lower ratio to hel fuel consumtion etc etc, what ratios are available and where will i find them

[Brianmoooore]

Post 9/84 323s, pre 9/86 325s and pre 9/85 320s have 3.46 diffs.

[bodger]

cheers brian, ill keep m eye out for one off them, will this noticably effect acceleration

[DanThe]

I have a 3.45 from a diesel, if its of interest there is a thread in the for sale section

[itec]

Hi bodger,
I am looking to do the same, at the moment i don't know my ratio as the tag is all rusty

I am interested to know what is your speedo speed, when your rpm is at 3000 in 5th gear

Mine is at 70 mph, (my tyres are 205/55 15")

i would be good to know the same from other zoners as well.

[daimlerman]

4.1 gives 65mph at 3000rpm.3.64 gives 75mph at 3000rpm.4.45 gives 60mph at 3000rpm