OUR VIDEOS GALLERY MEMBER SPONSORSHIP VENDOR SPONSORSHIP

User Tag List

Page 2 of 6 FirstFirst 1234 ... LastLast
Results 11 to 20 of 53

Thread: 63% Reduction Gears To Suit GQ GU Patrol

  1. #11
    Administrator AB's Avatar
    Join Date
    May 2010
    Location
    Christmas Hills - Yarra Glen - Victoria
    Posts
    28,054
    Thanks
    13,546
    Thanked 20,715 Times in 8,559 Posts
    Mentioned
    579 Post(s)
    Tagged
    1 Thread(s)

    Quote Originally Posted by PeeBee View Post
    This is what I lifted off the Marks 4x4 website. I have 85% reduction in ,y manual, but they are recommended for auto's. Be aware though that 85% is a huge difference in top end speed in low range - could affect sand driving ease as you are putting a lot more torque down to ground instead of speed. I think mine is too low for sand to be honest.

    The 85% reduction gears give you the biggest reduction we offer. These are mainly suited to rock crawling vehicles or vehicles that are prone to run away down hill (fitted with an automatic transmission). As an example this reduction gives a manual vehicle about two full gears below where the factory gearing sat. The maximum speed in low range will be approximately the same as third gear with standard gearing. High range is not altered when fitting our low range gears
    Yeah 85% is huge Phill.

    Awesome for the dedication of climbing etc but hard to still be an all rounder.

    63 is perfect in my opinion. I've played a little bit on the soft sand with the 63% on the Murray 200m runs 1 foot soft as hell sand and it's awesome in 2nd and 3rd.

    Still, a good set up rig should do first high with ease on sand flats moderately steep dunes too but that's another conversation...lol


    Sent from my iPhone using Tapatalk

  2. The Following User Says Thank You to AB For This Useful Post:

    PeeBee (4th December 2018)

  3. # ADS
    Circuit advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many

     

  4. #12
    Expert Bloggsy's Avatar
    Join Date
    Jun 2010
    Location
    Perth WA
    Posts
    188
    Thanks
    43
    Thanked 97 Times in 63 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    I have these 63% reduction gears in my 4.8 auto (I'm running 3.9 diffs, not 3.5s that come standard). I would have to say they are one of the best mods I've done to this Patrol. 1st low down hill is brilliant, no runaway, sometimes a bit too slow if I'm running the 33" tyres, but a little throttle solves that. I can drive around the tracks in low range all day long, not a problem. So much better control over the lumpy stuff. I haven't actually tried them in sand as yet, but I can't really see a problem as top speed is around 50-60kmh without revving the guts out of the motor.

    Cheers,
    Darren

  5. #13
    Legendary
    PeeBee's Avatar
    Join Date
    Sep 2016
    Location
    Melbourne South east
    Posts
    4,709
    Thanks
    4,587
    Thanked 4,674 Times in 2,651 Posts
    Mentioned
    190 Post(s)
    Tagged
    0 Thread(s)

    I would max out at around the 35klm mark with 3.9's and a manual, in 5th, redline is 3200rpm in chev

  6. #14
    ......... MB's Avatar
    Join Date
    Nov 2015
    Location
    Yarra Valley
    Posts
    8,612
    Thanks
    22,737
    Thanked 11,241 Times in 4,952 Posts
    Mentioned
    468 Post(s)
    Tagged
    0 Thread(s)

    Reduction gears in general I now agree are probably one of the newfound nuffy MB best mods I’ve ever done too.
    Makes for such a more relaxed descent in the gnarly stuff and same same up those rocky tracks.
    Sorry Philstar but will say your beast kindly allowed a putt putt drive prior is just too damn slow in between tracks on the flat ridges old mate.
    IIRC we shouldn’t be running LR 4th&5th for too long up top and it’s a little annoying switching back to HR repetitively, your honest thoughts @PeeBee mate?


    Sent from my iPhone using Tapatalk

  7. The Following User Says Thank You to MB For This Useful Post:

    PeeBee (6th December 2018)

  8. #15
    The 747 Winnie's Avatar
    Join Date
    Dec 2011
    Location
    Gippsland, VIC
    Posts
    15,811
    Thanks
    7,269
    Thanked 12,386 Times in 6,250 Posts
    Mentioned
    201 Post(s)
    Tagged
    1 Thread(s)

    Quote Originally Posted by MB View Post
    Reduction gears in general I now agree are probably one of the newfound nuffy MB best mods I’ve ever done too.
    Makes for such a more relaxed descent in the gnarly stuff and same same up those rocky tracks.
    Sorry Philstar but will say your beast kindly allowed a putt putt drive prior is just too damn slow in between tracks on the flat ridges old mate.
    IIRC we shouldn’t be running LR 4th&5th for too long up top and it’s a little annoying switching back to HR repetitively, your honest thoughts @PeeBee mate?


    Sent from my iPhone using Tapatalk
    Why not use 4th and 5th? There are 5 gears available to use and I use them all!

    Sent from my SM-G960F using Tapatalk

  9. The Following User Says Thank You to Winnie For This Useful Post:

    PeeBee (6th December 2018)

  10. #16
    ......... MB's Avatar
    Join Date
    Nov 2015
    Location
    Yarra Valley
    Posts
    8,612
    Thanks
    22,737
    Thanked 11,241 Times in 4,952 Posts
    Mentioned
    468 Post(s)
    Tagged
    0 Thread(s)

    63% Reduction Gears To Suit GQ GU Patrol

    For “too” long I was told, maybe a spinnie heaty thingy?
    EDIT: Donk-Box-‘Transfer’-Diffs ?

    Sent from my iPhone using Tapatalk
    Last edited by MB; 6th December 2018 at 08:01 PM.

  11. #17
    Legendary
    PeeBee's Avatar
    Join Date
    Sep 2016
    Location
    Melbourne South east
    Posts
    4,709
    Thanks
    4,587
    Thanked 4,674 Times in 2,651 Posts
    Mentioned
    190 Post(s)
    Tagged
    0 Thread(s)

    MB, its not a problem from a drive perspective. When I am in say 4th or even 5th, its easy coasting stuff, not any load, so in reality its basically using the gears as they are designed, but at a fraction of the speed. The 85% gears were installed to transform the vehicle when it had the original 2.8TD, and it absolutely did that, however with that engine there was too much gap between low and high range, so the middle ground flexibility was lost for stuff like sand. I would have struggled to get the barge across the Simpson in low with the 2.8 and it would not have made it over the first dune out of dalhousie in high.

    With the Chev, and 85% reduction, its basically a third low all day in the high country, maybe 2nd on a climb, then if steep and ledgey and slippery, first low and its a doddle down as you know. It is a pain at times when 5th is ringing my ears off, but I can always stop, which i don't! Personally I think the 63's would be ideal for this engine/diff combination, but most of my driving is high country and its a conservative package. With this gearing it would pull anything up any hill it could drive itself, so thats another comforting thought. I think the 85% question arose regards the selection for a vehicle with an auto trans?
    Last edited by PeeBee; 7th December 2018 at 09:18 AM.

  12. The Following User Says Thank You to PeeBee For This Useful Post:

    MB (7th December 2018)

  13. #18
    ......... MB's Avatar
    Join Date
    Nov 2015
    Location
    Yarra Valley
    Posts
    8,612
    Thanks
    22,737
    Thanked 11,241 Times in 4,952 Posts
    Mentioned
    468 Post(s)
    Tagged
    0 Thread(s)

    Just noticed yesterday the warning sticker under the visor of our stock 2001 GU TD42T family wagon, yet to install these great reduction gears.



    (4L) Must not exceed 50kmph it reckons so ran a few gear versus fully stock drivetrain tests on the old bus.

    4L 3rd gear = 3,500rpm ish
    4L 4th gear = 2,500rpm ish
    4L 5th gear = 2,200rpm ish

    I’m only assuming now it’s roughly those ‘TD42’ engine rpm’s per gearbox selection choice that we need to keep under for transfer case health and possibly not the 4th & 5th gear warnings I was once campfire Babbel given before?

    Would this below be roughly speed calculated up @PeeBee mate or have I got it arse about upside down again mate. Maybe it doesn’t matter with the final drive reduction gears?

    50kmph @ 85% reduction = 7.5kmph
    50kmph @ 63% reduction = 18.5kmph
    50kmph @ 43% reduction = 28.5kmph
    50kmph @ 24% reduction = 38kmph

    Either way, do love the 63% gears in my Chev ute too and reckon they’d be even better in the family TD42 wagon one day soon too.
    Still reckon you should try if hopefully possible to hang onto them Mark mate if keeping your beautiful beast of a TD42Ti




    Sent from my iPhone using Tapatalk

  14. #19
    Legendary
    PeeBee's Avatar
    Join Date
    Sep 2016
    Location
    Melbourne South east
    Posts
    4,709
    Thanks
    4,587
    Thanked 4,674 Times in 2,651 Posts
    Mentioned
    190 Post(s)
    Tagged
    0 Thread(s)

    @MB, have a look here, its a spreadsheet on the Marks 4x4 website that will give you HOURS of joy!!! You had me a bit confused and I could not really make sense of where you started and ended up, however either way this table gives you all the max sppeds based on your inputs for tyre size, engine rpm, original transfer case, reduction fitted and diff ratios. Its a beauty and will arm you with everything you need for that next campfire discussion - enjoy!!!

    https://www.marks4wd.com/gear-calculator.html

  15. The Following User Says Thank You to PeeBee For This Useful Post:

    MB (8th December 2018)

  16. #20
    ......... MB's Avatar
    Join Date
    Nov 2015
    Location
    Yarra Valley
    Posts
    8,612
    Thanks
    22,737
    Thanked 11,241 Times in 4,952 Posts
    Mentioned
    468 Post(s)
    Tagged
    0 Thread(s)

    That’s very cool, thanks Philstar!
    Seems briefly to calculate speeds etc....
    Any max warning speeds recommended built in for us?


    Sent from my iPhone using Tapatalk

Page 2 of 6 FirstFirst 1234 ... LastLast

Posting Permissions

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