E30 Differential Swap

[mike2010]

Will a 3.73 Limited Slip Diff from an E30 M3 fit into my e30 325i?

Thanks for any advice...

[nando]

E30 M3s come with 4.10s, not 3.73s

but in any case they are the same type 188 diff, so yes.

[87e30]

E30 M3s come with 4.10s, not 3.73s

but in any case they are the same type 188 diff, so yes.

+1. Nando knows e30s, no doubt.

[mike2010]

Ahh yes, a 4.10 instead of 3.73. Any experience with this conversion, will my gas mileage suffer horribly as a result of higher revs on the highway?

Thanks guys.

[Killacortes]

Ahh yes, a 4.10 instead of 3.73. Any experience with this conversion, will my gas mileage suffer horribly as a result of higher revs on the highway?

Thanks guys.

I dont think gas mileage would suffer that. i have been looking to get a 4.10 and i think i read that its only a 300 rpm higher difference

[Cabriolet]

the MPG loss between 3.73 and 4.10 is maybe only 2 mpg, when i went 4.10s i just started driving harder so i only get 15mpg in town and 23 freeway

[lennon]

i always felt like the 4.10 was a bit short for m20s, atleast ones that aren't highly modified and need high revs. 3.73 is good, or try to find a 3.91 from an automatic car if you think you need a shorter final drive. then again, tons of people have 4.10s in their 325's.

[nando]

automatics come with 4.10s too, 3.91 is only for the 325ix manual

[MR 325]

I've done the 4.10 thing, I prefer the 3.73 with my M20.

[blefevre]

4.10 decreased my mileage about 1-2mpg. It was almost necessary for me living at elevation. Power loss ftl, it was just dangerous trying to pass at highway speed going up I-70 without the 4.10.

[ZM Blue Devil]

I've done the 4.10 thing, I prefer the 3.73 with my M20.

Amen, with a manual car I dont care for the 4.10, 1st gear useless...

[nando]

pffft, only because your engine runs out of breath by 6000rpm ;)

[JdmEuroNorth]

^ziiiing

I'll be running a 4.10 with an m50. wish my tires luck..

[Stoner Sam23]

always thought M3's were small case and regular e30s were med case...

[Gooch]

E30 M3 4.10s are med case and E30 318is 4.10s are small case. Correct me if I'm wrong...