Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: What diff ratio?

  1. #1
    P Plater James's Avatar
    Join Date
    May 2010
    Location
    Mackay
    Posts
    57

    What diff ratio?

    I just fitted a 304 and 4 speed auto into my HZ wagon.

    Just wondering opinions on best diff ratio to fit. It currently has a 2.78 which is way too high.

    3.36 or 3.55?

  2. #2
    Leadfoot SANM4N's Avatar
    Join Date
    Jul 2013
    Location
    Pakenham victoria
    Posts
    165
    id go 3.08 or 3.36 probably 3.36 i reckon that would go well with the 4 speed, have you kept the injection on it? did you modify your loom or did you buy one to just plug in?

  3. #3
    P Plater James's Avatar
    Join Date
    May 2010
    Location
    Mackay
    Posts
    57
    Yeah mate I kept the injection and made my own harness.

  4. #4
    Night Rider Valencia's Avatar
    Join Date
    Jul 2011
    Location
    Perth
    Posts
    4,095
    3.36 would be a good ratio in a wagon

  5. #5
    I had my diff reconditioned and was advised that the 3.36 was going to be too low with the supra box I was fitting it behind. The shop recommended I went 3.08 ratio for added strength as the 3.36 teeth are thinner. Not sure if I was taken for by the sounds of it or if it's good advice. I guess the good news is I've got a set of 3.36 gears in a box somewhere if you decide that's the path you take and need a set

  6. #6
    Sandman Guru
    Join Date
    Jul 2010
    Posts
    6,451
    What tyres? In a Commodore, Calais or Statesman the 304 and 4spd auto normally have 3.08 and 15" tyres.

  7. #7
    P Plater James's Avatar
    Join Date
    May 2010
    Location
    Mackay
    Posts
    57
    It has 14" tyres.

  8. #8
    It's a rockin' adam perth's Avatar
    Join Date
    Feb 2010
    Posts
    1,222
    James I would go 3.55 if I were you . This will give you a 2.84 overall final drive in overdrive. 3.36 large Salisbury are getting difficult to find

  9. #9
    Sandman Guru
    Join Date
    Jul 2010
    Posts
    6,451
    Quote Originally Posted by James View Post
    It has 14" tyres.
    What size though?
    I would have thought a 14" tyre with 2.78 would be fine, if not 3.08, in something light like a HZ. Remember a HZ is significantly lighter than a Statesman or VT

  10. #10
    P Plater James's Avatar
    Join Date
    May 2010
    Location
    Mackay
    Posts
    57
    245/60/14 on rear. With the 2.78 it's nearly like it's labouring in overdrive at 100kph. It sits about 1900rpm.
    I do have a 3.08 diff to go in but not sure how much difference it would make.
    I have been told the revs need to be up a bit higher for the lock up to work??

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Best Diff ratio
    By HJsandman75 in forum Driveline
    Replies: 8
    Last Post: 24-07-2015, 12:39 AM
  2. Diff ratio information
    By Bigtonkatoy in forum The Lounge
    Replies: 4
    Last Post: 07-02-2014, 07:53 AM
  3. Diff ratio 2.6 ?
    By Gunna Do in forum The Lounge
    Replies: 6
    Last Post: 03-05-2013, 12:52 PM
  4. How to tell which Diff Ratio.
    By Cyclamin in forum Driveline
    Replies: 6
    Last Post: 19-11-2012, 07:29 AM
  5. Diff Ratio's.
    By hux454 in forum The Lounge
    Replies: 6
    Last Post: 05-04-2010, 06:15 PM

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
  •