Clutch or Gearbox???

Discussion in 'Technical' started by 90TTZ, Sep 12, 2013.

  1. 90TTZ

    90TTZ Back From The Dead

    Gave a fellow member a hand to fix some suspension issues only to be confronted by another. He managed to drive the car out of my shed, out of the driveway and about 100 metres down the road. He stopped and then tried to turn around and found that it would no longer go forward but it would go backward so he reversed back down the road to my driveway. I jumped in it and managed to get it to barely move forward in 4th gear.

    OK so I know you are all saying its the clutch which I would have to agree, once it got warm its slipping. But tell me why when I put it in a gear, let out the clutch you can tell the car is trying to move with the symptoms of a badly slipping clutch but the speedo is giving a reading????
     
  2. East Coast Z

    East Coast Z Well-Known Member

    Why?

    Are you trying to move forward in 4th gear?:confused:
    That's a good way to damage the clutch.:(
    If the clutch is defective, why would it not work in forward gears & work in reverse gear?:confused:
     
  3. Scrubber

    Scrubber New Member

    Hi Carl

    Jack it up and see if the tail shaft is spinning it may be a Diff. Going by the fact the speedo is showing speed as i think its on the output side of the gear box

    Cheers

    Troy
     
  4. beaver

    beaver southern zeds

    Its the clutch

    carl, as you suspected. let the good times roll.
     
  5. 90TTZ

    90TTZ Back From The Dead

    Can you explain the reason why I would be getting a speed reading when the wheels are not turning?
     
  6. 90TTZ

    90TTZ Back From The Dead

    Highly doubt its the diff mate. The car would not move at all not to mention the gut wrenching sound of metallic bits being crunched every which way! He's also experienced a similar issue to this a few months back and he thought it was the park brake grabbing.
     
  7. Scrubber

    Scrubber New Member

    a few years back a mate did a axle in a old lsd solid diff there was no noise and only minimal drive. i think the time it takes to see what happens with the tail shaft is well spent.

    the fact that the is movement on the speedo to me means it most likely behind the gearbox

     
  8. rollin

    rollin First 9

    as said above im thinking a broken halfshaft or similar, giving drive to just one wheel and working the LSD hard !!
     
  9. Wilo300zx

    Wilo300zx 1990 JSpec N.A Fairlady M

    How would this be an issue if the car hasn't been running for 5-6 months and prior to this it was running fine/registered? My transmission has always been fine, only usually have issues with my power steering line or passenger side suspension :(

    So either way I am looking at a new diff or new transmission tunnel? :(

     
  10. Mitch

    Mitch Has one gear: GO

    speed sensor is in the gearbox, not the diff. Hence speed reading.
    What happens inside the gearbox is still magic to me.
     
  11. beaver

    beaver southern zeds

    No I can't

    explain that Carl. I don't know anything about this cars history full stop. All I'm going of is the fact that it tries moves a little in fourth, you don't mention any sounds/smells at all, just the speedo reading. BTW my speedo once said I was doing 65K's inside my garage with the engine of, I was tuning my stereo in att.


     
  12. grub

    grub New Member

    it may not be related but what work was done on the suspension?
     
  13. Tektrader

    Tektrader Z32 Hoe, service me baby

    I had a rear drive shaft CV joint that was hammered and the drive pinion rotated inside the CV joint. Car revved fine but didn't go anywhere quick.
     
  14. Wilo300zx

    Wilo300zx 1990 JSpec N.A Fairlady M

    Nothing out of the unusual. I had a control arm give on (Nut come off out of the pivot volt closest to the rotor) which caused my car to slide off the road and bent my control arm and shock. I've since replaced them both.
    The car has aftermarket coilovers front and back with adjustable camber arms front and back.

    I was having a weird vibration through the transmission before the control arm gave way and put that down to a bad tailshaft/cv joints so I bought a 1 piece off Chrispy.

    It's a n.a Z and I've never been to a skidpan day or done burnouts in the car so not sure why the clutch or diff is playing up. I've got a lightened flywheel and exeedy organic full face clutch in the car but that was put in several years ago and has done less than 15000km on these parts.

    Hope this helps
     
  15. ZX1990

    ZX1990 2+2 TT Manual

    This - When I did my halfshaft I was able to roll back home (lucky it broke just up the hill opposite my house).

    Get someone to sit in it and let the clutch out in 1st - you'll see one half shaft spinning and not the other one....
     
  16. Wilo300zx

    Wilo300zx 1990 JSpec N.A Fairlady M

    Dam, this isn't good. Can a diff be repaired or is it easier to replace it? :zlove:
     
  17. tassuperkart

    tassuperkart Its a lie I tell you!

    It is but it reads off the gearbox output shaft. last part of the gearbox before the tailshaft.
    Diff issue for sure.

    E
     
  18. ZX1990

    ZX1990 2+2 TT Manual

    Prob easier to replace it.... but it could be one of a few parts between the internals of the diff and the hub....

    Mine did the outer stub axle:
    [​IMG]
    But was pretty obvious as you heard it scraping.

    Think Chris - sevenangrypenguins - has done a few output flanges on the diff at the drags, but could be what Tektrader mentioned above when you went off the road recently....
     
  19. grub

    grub New Member

    +1 busted half shaft
     
  20. 90TTZ

    90TTZ Back From The Dead

    The diff guys have it! With the left rear lower control arm coming adrift the half shaft yoke was pulled out of the diff. When I went out to the shed this morning I had a look at the diff and it poked me in the face. Anyway, all fixed and driving again!

    Well done Scrubber and rollin :)
     

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