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No Reverse!!!

Discussion in 'Drivetrain' started by Oilfield70, Feb 19, 2012.

  1. Oilfield70

    Oilfield70 Guest

    Ok members, I have a 1988 Celica GT with of course the 2.0l and the 5 speed tranny. The issue I am having is that it will not go into reverse. All of the other foward gears work however when placed in reverse it grinds. I have been told that it could be the Syncro or the fork in the tranny that is causing this problem. For a while prior to it not going into reverse I could roll it backwards and it would fall into place. Now of course it does grind. Could it possibly be a minor adjustment I need to perform on the cables? Any insite and help will be greatly appreciated. Thanks.
  2. 1fstgts

    1fstgts Well-Known Member Staff Member Administrator Moderator Donated!

    You would be having other troubles if it were just a cable adjustment problem. Sounds like a tranny issue....
  3. aaron

    aaron Well-Known Member

    How's your clutch master?

    Mines rooted and the gearbox hates going into reverse when the clutch isn't disengaging properly.

    I bled and filled the clutch fluid and it goes in perfectly for a couple of shifts, then back to shit.

  4. MattC

    MattC Well-Known Member Donated!

    There is no synchro on reverse, so it certainly won't be that. Will it slot into reverse without the motor running? If so I would have a guess and say it is most likely a clutch issue. If not, I would say the reverse gear shift fork is forked.

    If you really want to kick the problem's ass, put an MR2 gearbox in it, then you'll have FIVE reverse gears! :science2

  5. Stig

    Stig ST162 Guru Donated!

    All our boxes grind if you don't give the gears time to slow down, they are worn and take far longer to stop spinning, as all the others work there's nothing wrong with the clutch.

    There's no syncro on reverse (as stated) - It's a small gear that gets rammed between two other gears and changes the rotation of the gears direction as it does so.
    Reverse has it's own fork - if it's loose there's no way to fix it in the car
    The gear sits on it's own shaft and it's possible the shaft may be loose - check the bolts at the front of the box

    Here you can see it in front of of the forward gears

    As you say it's been grinding for a while, my 10c is that the teeth are badly flattened. They normally have sharp edges to engage better.

    I'd check my shifter cable bushes and the gearbox lever mounts are tight - (2 rubber ones and a square block) 1st, that may help it engage better.

    2nd I'd put in thicker oil 80W-90 or thicker - It helps slow the gears better by creating more drag and also stops worn bearings slopping around as much

    There's a gearbox diagnosis on my thread, the menu is below my signature pic
    Good luck, honestly I'd start saving/looking for a ST202 box
    Last edited: Feb 22, 2012
  6. fernandocelica

    fernandocelica Well-Known Member Donated!

    Mine used to grind gear's on second and third now it is all gone once I have drain all the oil out of it and replaced it with a mixed oil's power steering and ep90 gearbox oil it was amazing it worked for me don't ask why.
  7. Jamezzy

    Jamezzy Well-Known Member Donated!

    Mine doesn't grind, but jerks a bit and struggles to stay on Reverse. Needs a little help and keeping the Rpms on 3k works after 5 secs. Did I mention mine is an automatic? haha I'm doomed. Plus I think the forward gears are slowly starting to slip. It's walking timebomb. I guess I'm gonna have to push my car out of the parking lot soon
  8. Stig

    Stig ST162 Guru Donated!

    Auto is a different thread altogether

    Yes, It uses a system of clutch plates to transmit power. You're having to heat them up to get them working.

    Reverse gear works by engaging one of the gears and then reversing direction with a set of helical gears.
    Theres also a system of valves to control the clutches called a valve body which can go wrong too.

    Your box will need to be overhauled completely, the clutches are cheap but the labour isn't and there are some fancy tools involved.
    The clutches and their basket showing signs of slippage

    The valve body (controller) removed, valves can stick causing delayed changes, slamming into gear etc
    Please note
    In the above pic you can see I've removed the diff as well and the rear drain plug.
    The diff on auto's uses Diff oil while the box itself uses ATF.
    So for auto owners it's a double job to drain and fill both cases - I've seen MANY cases where the diff bearings seized because the owner didn't realize the diff used it's own oil.

    Helical reverse gear
    Last edited: Feb 24, 2012
  9. Spiderman

    Spiderman Well-Known Member

    Thanx Kevin, great auto info, I for one had no idea there were 2 seperate cases, good stuff :thumbsup:
  10. Jamezzy

    Jamezzy Well-Known Member Donated!

    Yeah thanks for info. Automatics are just expensive, heavy, and no fun at all :/
  11. Stig

    Stig ST162 Guru Donated!

    I'd by another one, stick in a 4S block and relax in traffic while sipping my coffee and having a shave.

    Autos have their uses, I guess we all need more cars to suit our moods
  12. Jamezzy

    Jamezzy Well-Known Member Donated!

    Only time I would drive an automatic is if I'm driving a truck :D Not easy using a stick when trying to get out of some mud. lol
    Sorry for topic change
  13. Spiderman

    Spiderman Well-Known Member

    Yup, gotta love my auto for ease of use and cruising, no fuss, no hassles. The thought of using all 4 limbs to operate a vehicle does my head in, you know where you can stick that stick :mrgreen

    Yes, autos can be an expensive PITA when they're clagged but if they're treated properly, sweeeeeeet.

    :lol Hey Kev, you would have your hands full 'literally'.......... don't forget to answer that hands free phone while steering with your knee :lol

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