Results 1 to 10 of 10

Thread: LSD 3.54 gear ratio

  1. #1
    Registered User kcoke's Avatar
    Member ID
    CZCC-12810
    Join Date
    Oct 2006
    Location
    Redding, California
    Posts
    89

    Default LSD 3.54 gear ratio

    So I found a LSD 3.54 gear ratio differential. If I swap this into my 71 240z that has the stock differential which i believe the gear ratio to be 3.36 what kind of difference will I see. Is this a better upgrade? Any performance difference? Also I am running a 5 spd tranny and l24 modified.
    Thanks

  2. #2
    Enjoying the ride... 240ZMan's Avatar
    Member ID
    CZCC-4803
    Join Date
    Aug 2003
    Location
    Castle Rock, Colorado
    Posts
    565

    Default

    There are 2 issues:

    a) the 3.54 ratio will generate more torque at the rear wheels giving a little better acceleration, but at the expense of needing to shift more often and hurting mileage a little.

    b) Do you want/need an LSD? Do you have any issues with losing traction with your inside rear wheel now? If you don't, you might not want to install the LSD. They are not completely transparent as you will probably notice it when turning sharply at slow speeds (parking lots), and also may notice it changes how the car handles at speed.

    You didn't say which 5 speed you're running, but you might want to spend some time at http://www.geocities.com/z_design_st...nsmission.html to see how the change will affect your speed in gears.
    Daniel
    '73 240Z
    Castle Rock, CO

  3. #3
    Registered User kcoke's Avatar
    Member ID
    CZCC-12810
    Join Date
    Oct 2006
    Location
    Redding, California
    Posts
    89

    Default

    its a 280zx 5 speed transmission and the LSD is already installed whats the pros and cons of doing this swap?

  4. #4
    Registered User
    Member ID
    CZCC-8541
    Join Date
    Jun 2005
    Age
    77
    Posts
    263

    Default

    ZX is a stronger tranny than the original 240. Better still if it's a late one (ratios closer). Good swop, only down side (dependant on which tranny you had in the first place) is your 1st gear may be a bit low and you may need to change the speedo drive in the box but having said that if it all came out of the same car then this won't be a problem. Increase in gas mileage will be marginal as will top speed but having said that acceleration will be improved.

  5. #5
    Registered User Marty Rogan's Avatar
    Member ID
    CZCC-874
    Join Date
    Jun 2000
    Location
    Arlington Heights, IL USA
    Posts
    1,202

    Default

    Quote Originally Posted by kcoke View Post
    So I found a LSD 3.54 gear ratio differential. If I swap this into my 71 240z that has the stock differential which i believe the gear ratio to be 3.36 what kind of difference will I see. Is this a better upgrade? Any performance difference? Also I am running a 5 spd tranny and l24 modified.
    Thanks
    Is that a Subaru LSD ? Did you have to change the out put flanges on the sides? If so, how difficult was that? any other mods that you needed to do.

    Thanks,

    Marty

  6. #6
    Registered User kcoke's Avatar
    Member ID
    CZCC-12810
    Join Date
    Oct 2006
    Location
    Redding, California
    Posts
    89

    Default

    I didnt do it. I saw it on ebay and wondering if I should bid on it and if its good swap?

    http://cgi.ebay.com/ebaymotors/datsu...WDVWQQtcZphoto

  7. #7
    Registered User
    Member ID
    CZCC-5121
    Join Date
    Oct 2003
    Location
    Seattle, WA
    Posts
    2,362

    Default

    I know you can use the Clutch LSD, but I'm not so sure about the viscous LSD. You might check with a 510 forum before you buy this thing.

    The 3.54 is a tall rear gear for use in conjunction with the ZX 5 speed. It will be relatively low in the rpm range at speed, so when you go up hills or when you're passing you'll have to downshift to 4th more often. A 3.90 is what came stock with the ZX 5 speed. A 4.11 would be nice.
    Jon

  8. #8
    Registered User red_dog007's Avatar
    Member ID
    CZCC-12322
    Join Date
    Aug 2006
    Location
    Chattanooga, TN
    Posts
    538

    Default

    I would rather go with a 3.9 or 4.11. That is what I am keeping my eye out for. Even thinking of getting an old rusted 1980zx cause I want that 5-Speed and I wouldn't mind settling for the 3.9, but I had rather get the 4.11.
    1980zx 5-Speed w/ a 3.9 or 4.11 is the route I am going myself. Best for acceleration. Just taking advantage of the cars strong points, already having awesome handling, making it pull out of corners even harder will capitalize on the strength of the car.

    *Held for my future Datsun*
    1997 Buick LeSabre 122,000 miles (My DD)
    2003 Mitsubishi Outlander 90,000 miles (Wife's DD)

  9. #9
    Registered User Dreco's Avatar
    Member ID
    CZCC-1087
    Join Date
    Mar 2001
    Location
    Dallas, TX
    Age
    49
    Posts
    522

    Default

    i have a 3.9 LSD.. used to have a 3.54, great for highway, but horrible for track, it was too tall for my liking..

  10. #10
    Datsaholic Mr Camouflage's Avatar
    Member ID
    CZCC-1278
    Join Date
    Oct 2001
    Location
    Perth, Western Australia
    Age
    48
    Posts
    3,460

    Default

    Thought it looked too small to be an R180. Its an R160.
    www.nostalgictrio.com Skyline - Silvia - Fairlady Z
    www.ozdat.com The Australian Datsun site.
    www.cafepress.com/vintagedatsun

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Rear end gear ratio, and differential identification
    By s14280zx in forum Engine and Drivetrain (S30)
    Replies: 6
    Last Post: 08-29-2006, 06:03 PM
  2. Gear Ratio Explanation
    By Zrush in forum Suspension and Steering (S30)
    Replies: 2
    Last Post: 06-18-2004, 08:59 AM
  3. 5spd & LSD gear lube?
    By panchovisa in forum Help Me !!
    Replies: 10
    Last Post: 03-29-2004, 06:49 AM
  4. rear end gear ratio
    By prkrgrp in forum Engine and Drivetrain (S30)
    Replies: 1
    Last Post: 08-17-2002, 11:52 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •