Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Differentials

  1. #1
    Join Date
    Dec 2010
    Location
    Mirboo North Victoria
    Posts
    429
    Total Downloaded
    0

    Differentials

    Thanks to all who gave advice regarding gearbox now I would like opinions on differential ratios to go with 186 Holden motor should I stick with original or opt for 3.54:1 centres for better highway use. Remembering I will be loaded with full camp gear and most times a 4.5 metre boat, it is a tinny and quite light
    Looking forward to your insights. Gippy

  2. #2
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    4,203
    Total Downloaded
    0
    with ratio changes, more important than whether you want highway cruising, is the question of how much low ratio are you willing to sacrifice for the highway cruising advantage.

    ie. choose between changing two diffs, or look at either a high ratio change or an overdrive.

    Changing the high ratio gears will leave the low ratios alone.
    Arthur.

    '99 D1 300Tdi Auto
    '03 D2 Td5 Auto

  3. #3
    Join Date
    Jul 2011
    Location
    Yarrawonga, Vic
    Posts
    6,513
    Total Downloaded
    0
    Theres no high ratio option in the transfer case on a Series.

    I'd stick with 4.7 , 3.54 will be too tall for the weight you will be pulling , 1st gear high ratio you will struggle to pull away on a slope . and the clutch will suffer.

    The 186 is not as torquey down low as the original 4 banger.

    Overall first gear with 4.7 is 19.2:1 2nd gear 11.98

    with 3.54 first is 14.63 , so about 1/2 way between your existing 1st gear & 2nd gear.

    You could install a Global Roamerdrive , about $2200 from Huttons Winches.

  4. #4
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    4,203
    Total Downloaded
    0
    Quote Originally Posted by goingbush View Post
    Theres no high ratio option in the transfer case on a Series.

    ....
    Ooops! apologies .. didn't know this.
    I was too young to remember my dads SII, even when I did start driving it.
    Arthur.

    '99 D1 300Tdi Auto
    '03 D2 Td5 Auto

  5. #5
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    6,314
    Total Downloaded
    0
    I have a high ratio transfer box in a shorty powered by a C240 Isuzu motor.
    Easily keeps up with the traffic on the freeway and the low ratio isn't compromised. I was told I'd be slipping the clutch like mad to pull away from a standstill but the naysayers were proved wrong, the only compromise is it doesn't like 4th much below 60kph.

    You can get the parts from Ashcrofts in the UK and get the machining done locally or send them a transfer box casing and they will modify & return.

    Ashcroft Transmissions


    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  6. #6
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    28,804
    Total Downloaded
    0
    To clarify the last coupleof posts - there is no high range option on the Series transfer case. But as Colin says, there is a high range modification. The problem is it requires the position of the intermediate shaft to be moved, meaning the casing needs modification, but there is an established procedure for this.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  7. #7
    Join Date
    Jul 2007
    Location
    North East Victoria
    Posts
    220
    Total Downloaded
    0

    diffs

    Years ago I had a series 2 with a holden 186 engine. Found some diffs from an older Rover Car. Can't remember the model.
    They were 3.9 ratio and worked well under all conditions.
    They were a straight swap from what I remember.
    Pete.

  8. #8
    Join Date
    Dec 2010
    Location
    Mirboo North Victoria
    Posts
    429
    Total Downloaded
    0
    I also had an old one about forty years ago, it was a Series 1 with 245 Valiant slant 6 and Rover 90 diff centres but I don’t think they would fit the Salisbury rear diff housing maybe some one can help I appreciate all of the answers so far.
    Gippy

  9. #9
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    28,804
    Total Downloaded
    0
    No - Rover diffs will not fit a Salisbury axle. There were several different ratios used in Rover cars, which will swap into Series axles, but not the Salisbury.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  10. #10
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    6,314
    Total Downloaded
    0
    A diff ratio change will alter low range.
    The advantage of the high ratio transfer box is that there is an almost negligible change to low ratio.
    So you need to decide whether the vehicle will be used seriously off road.

    The next best thing would be an overdrive.

    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '58 Series II (sold)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

Page 1 of 2 12 LastLast

Tags for this Thread

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
  •  
Search AULRO.com ONLY!
Search All the Web!