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  #1  
Old September 1st, 2011, 06:20 PM
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bryan
1995 D90
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transmission issue?

went to drive my '95 D90 and it would not shift gears, totally locked. when i turn the car off i am able to shift. has anyone run across this?
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  #2  
Old September 1st, 2011, 08:51 PM
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Charles Galpin
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That's really odd. Are you starting in neutral? If yes, put it in gear, make sure there is nothing in front of you, put your feet on the clutch and brakes and try start it. Does the try try to go forward or just start and idle fine? What happens when you then let off the clutch?
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  #3  
Old September 1st, 2011, 09:04 PM
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You're pushing the clutch in?
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  #4  
Old September 1st, 2011, 09:15 PM
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He didn't mention a clutch. Could it be an automatic?
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  #5  
Old September 1st, 2011, 09:16 PM
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Charles Galpin
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I assumed it's manual since he didn't say he had an auto conversion (it's a 95)
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Old September 1st, 2011, 09:42 PM
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John Karlsson
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I wondered about that. My only experience is with Series and ROW trucks.
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  #7  
Old September 1st, 2011, 10:51 PM
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Jim Pace
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1. Check fluid level in clutch master?
2. May have clutch disc rusted to flywheel if "parked" for extended period? If rusted up may be able to "free" it once started (in gear). Lot's of "take care" parts to this procedure!
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  #8  
Old September 2nd, 2011, 07:49 AM
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thanks for the responses. it's a manual. i started it in gear and neutral. i have to have the car off to put it in gear. it's starts fine and can move forward in 1st gear, but can't put into 2nd or any other gear. clutch does seem loose. more than usual. i drive it daily and it's parked in a garage. thanks again.
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  #9  
Old September 2nd, 2011, 08:04 AM
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Charles Galpin
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Can you take it out of gear once driving? What happens when you try change gears? Does the gear lever just not move or do you hear grinding? From your description the clutch doesn't sound like the issue to me.

It's possible to shift without a clutch by getting the transmission and engine speeds in sync, so you should be able to take it out of first, blip the throttle and put it into second without using the clutch. If you can't do this, I think it's a linkage issue or something internal to the transmission, although I don't see how it running could affect this.
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  #10  
Old September 2nd, 2011, 08:09 AM
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No i can't take it out of gear once driving. it's completely locked in gear. No grinding, just locked. when the car is off i can shift without using the clutch. that's why i thought the clutch cord might have snapped.
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  #11  
Old September 2nd, 2011, 08:16 AM
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Charles Galpin
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IMO the clutch is fine if you can start with your foot on the clutch and then the truck starts rolling when you let it out. It's hydraulic btw, no cables involved. There is a known failure point on the clutch fork (inside the bell housing) but I don't think you'd be able to start and go like you say if that was the issue. Check the fluid as Jim suggests to be sure.

Otherwise I'm stumped.
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  #12  
Old September 2nd, 2011, 08:21 AM
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thanks for responding so quickly. i will check the fluid right now.
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  #13  
Old October 28th, 2011, 10:49 AM
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I am having the exact same problem - it just started today. I'm running an LT77.

If I start the vehicle in neutral, push the clutch in and try to shift, it won't shift into a gear, except reverse.

If I start the vehicle in gear, it will stay in that gear. I can get it into neutral (with significant effort), but I can't get it back into 1st or 2nd, etc. No grinding, stick just won't move into any gear.

Turn off the ignition, and I can shift into gear and drive just fine as long as I stay in that gear. Tough way to drive unless you want to stay in 2nd gear the whole time....

One last thing that is noteworthy: when I am stopped, have the clutch pedal depressed, and the transmission in 1st or 2nd, the car will try to move forward if I release the brake pedal.

If you have diagnosed the problem, please post again.
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  #14  
Old October 28th, 2011, 01:52 PM
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On the LT77, if you pull off the shifter (easy to do - four bolts), there's a mechanism in there that the ball portion of the shifter sets in. That mechanism is held in place by a screw. Sometimes that screw comes loose and makes it very difficult to shift. Remove the screw, clean things up, and use some red threadlocker on it. Not saying that's the problem, but it's something cheap and easy to do and it definitely affects your shifting.
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  #15  
Old October 28th, 2011, 02:17 PM
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Charles Galpin
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To me this says the clutch is not fully disengaged. I am unsure which components to suspect without seeing leaks, but all the hydraulics are pretty cheap and easy to do, so you could start there. Master, slave and soft line. If that doesn't fix it, time for a clutch IMO.

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Originally Posted by DNinety View Post
One last thing that is noteworthy: when I am stopped, have the clutch pedal depressed, and the transmission in 1st or 2nd, the car will try to move forward if I release the brake pedal.
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