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3.73 dif. in an ETA

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    3.73 dif. in an ETA

    i have a 87 325i auto parts car i think its a 3.73 (read it in the owners manual) not sure of lsd tho, and ive been wondering if it would be a good idea to put it in my eta (when i get it back from the head rebuild)

    i did search, but id like to see what u guys have to say about it.

    Thanks
    sigpic

    #2
    There should be a tag on the back of the diff. S3.73=LSD 3.73= open rear.

    i got a set in my e and i love them. But it runs around 3000rpms at 65mph on the high-way.

    1992 BMW 325iC
    1978 Chevrolet Monte Carlo
    1965 Chevrolet Corvair Monza 140hp

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      #3
      3k at 65? i dont think that would be ideal for my DD i do alot of highway driving
      sigpic

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        #4
        I ran 4.10 gears in my eta while awaiting the headswap. It wasn't/isn't my daily though. I loved it, although I'd have run 3.73's if it was a daily.
        Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

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          #5
          I love my 2.93 LSD in my DD... MORE FUEL ECONOMY!
          :: PNW Crew ::
          '87 325 4dr, '74 2002

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            #6
            I am running a 3.73 lsd in my eta right now. I love it. The highway will kinda suck, but I will be ok. Say good by to your first gear. Red line comes up "what, only at 20 MPH" lol.
            Originally posted by cabriodster87
            "Honey? What color is this wire? Is it the same as that one? Are you sure? I don't believe it. OK, it works. Thank you sweetie."
            Originally posted by Kershaw
            i've got a boner and a desire to speed.

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              #7
              lots of highway... then dont do the 3.73.

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                #8
                I don't care what people say, the 3.25 diff is perfect for an Eta.
                BimmerHeads
                Classic BMW Specialists
                Santa Clarita, CA

                www.BimmerHeads.com

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                  #9
                  Originally posted by MR 325 View Post
                  I don't care what people say, the 3.25 diff is perfect for an Eta.

                  I completely agree. Anything more is a waste of first gear.
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                    #10
                    -I had a 4.10 lsd in a '88 super-eta (5400 rpm redline). Good times with the 115 mph top speed.
                    1989 cirrisblau-metallic 325i

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                      #11
                      lol... with the B25 motor and this 3.25 LSD my car goes like 100-110 in 3rd.
                      BimmerHeads
                      Classic BMW Specialists
                      Santa Clarita, CA

                      www.BimmerHeads.com

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                        #12
                        i swapped in a 3.25lsd in my eta and it has been working great for me.

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                          #13
                          I have it in mine....LOVE IT
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                          Turn key track car.

                          http://www.r3vlimited.com/board/showthread.php?t=222066

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                            #14
                            I know my car is a SuperEta - but I did around 2500 miles of highway driving with a 3.73 in my SuperEta (5500 redline) and yea...the revs were high, and yea, I topped out at 110, and yea, on the highway when I was moving 100, I was at like 4000...but it seriously was totally worth it!

                            Now I have a 3.73 in my stroker...I should find a 4.10 :D
                            - Sean Hayes

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                              #15
                              thanks for info. my car wont be ready for a while tho, the mechanic that was supposed to rebuild my head(snaped t-belt) had the car for a month and just loosened some bolts. and now i dont know if i should rebuild the head, or swap in a b25 motor out of an 87 late wiring plugs.
                              sigpic

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