4.10 in the eta!

[PiercedE30]

I HAD a 4.10 in my iS. Doing 80 mph and I was right around 3800. I put a 3.73 in. Much better. I also tried out a 3.25 for a little while. Awesome cruising gear. Just as bad on gas as the 4.10 though due to the increased load. Ideally, I would probably put a 3.46 or 3.64 or something in.
This is all in a car with a M50 with the G260 tranny.

[e30_325es]

A 4.10 open diff would be useless in an eta. You will have very limited traction. And I hope you know how to set the preload correctly on the bearing once you pull the input shaft out.

[SlowGoinE30]

What usually comes stock in an Auto? a 4.10? 3.73? I guess I shouldnt be so lazy and get underneath it

[jintermont]

sorry for such an old bump but any updates on what you guys think but i just picked up a 4.10 open diff for free just needed input shaft seals i am wanting to put it into my '86 325es. i am aware of the highway issue but what are some of the long term experiences with this setup

[e30_325es]

Yeah, that's the plan. Plus the 283 catcams cam. She'll scream.

[EtaSport]

man, 4.10 in my eta would have been tourture. 3.25 was enough to bump the rpms higher than I liked.

That 4.10 will come in handy when you swap the head/motronic over e30_325es. The delphin in my sig has a 3.91 and that car pulls very hard.

[e30_325es]

You have to know the ratios of the tranny for it to be accurate though. You should be able to find thoese here if you don't know them.

You don't have to look too far, they are in this thread.

[AdironRider]

Yes you would. 4.10 in a 325is is money.

[Mike325]

Another good gear calculator is located at diffsonline.com. You have to know the ratios of the tranny for it to be accurate though. You should be able to find thoese here if you don't know them.

[e30_325es]

4.10 in an I puts the max gear speeds at the same as a 2.93 in an E, but you just go 2k more rpms in the same amount of time.

Just go to that gear calculator I posted up earlier and punch the numbers in.

[RedHoodRidah]

Cool. Do I get to keep 1st gear though??

[Mike325]

It would be very nice.

[RedHoodRidah]

How would a 4.10lsd perform in a 325is?

[e30_325es]

I just dropped my 4.10lsd in my ES, and absolutely love it! I took it up on the highway, and 75 is ~3500rpm. Do not downshift to 4th up here, 4th at 75 is 4500rpm, so that's a useless shift, plus it pulls pretty good in 5th anyway.

[ANDRÜ]

^VERY nice!! I cant drive it on some serious roads, or roads that are busy b/c I switched insurance from the eta to my Jeep for winter. I just tested it out on my road, which is fairly rural. Its a great improvement.