I'm experiencing a problem with either the shifter or trans in my '72 LT-1. After driving for an hour or so, It doesn't not want to stift into gear from a stop, any gear. Higher gears, reverse, double clutching, nothing seems to help. The only way to get goings seems to be a frantic shifter manipulation around the pattern several times. Could the reverse lock out mechanism be improperly adjusted to cause this? any ideas?
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Re: 4 sp tranny
I've had two similar problems.
One was the tranny was heating up and binding. I changed the gear lube and problem went away.
The other the shifter linkage was binding. Apparently, the shifter heated up and bound, not letting the arm move completely back to the neutral gate even though the shifter handle did. Disassembling it, cleaning the gunk out, and relubricating it with thin high temperature grease ended that problem. -
Re: How does it all work cold?
Does it go through the gears when the driveline is cold or is it still tough to sild into gear when you first start the car?
If it appears to go through the gears Ok cold, I would venture a guess that your clutching system my be suspect, especially when the pressure and clutch plates get warm.
Maybe slight clutch linkage throw adjustments could help you out.
I would think that a tranny shifting issue would be consistent hot OR cold.
If it's tough to shift cold ....maybe.... the lockout is a contributor.
ChuckComment
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Re: How does it all work cold?
Cold, it is like butter, crisp and positive. The shifter is REALLY sloppy though, no matter what the engine temp. The clutch seems O.K. I don't get any fade and it seems to engage properly. It can get a little grabby.Comment
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Re: How does it all work cold?
Have you checked the lube level?Bill Clupper #618Comment
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Re: How does it all work cold?
It appears that the clutch is not fully disengaging when warm - the friction created by driving produces heat causing expansion which in turn compounds the failure to disengage problem. Check that your clutch linkage is not so badly worn so as to prevent proper adjustment, if OK, set your free throw per specifications and try the shifting again.Comment
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Re: I would still be looking at the clutch setup
Back in my buy a set of rear tires a week days, Had a 440 sixpack GTX that pulled the same trick on me. Smooth as silk cold, but got progressively worse the longer I drove it and ahem....got on it
I was just getting myself primed to pull and dissect the tranny when my Dad counceled me on the virtues of sour clutches, pressure plates and throw out bearings.
The new clutch and pressure plate did the trick for my problem until I used up THAT clutch plate. Got pretty good tearing it down though.
I would think that engaging a sloppy problem shifter would be constant hot or cold so I would discount it for this particular issue.
I'm sure that others may have more to offer on this.
Good luck with it,
ChuckComment
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Re: I would still be looking at the clutch setup
Check for proper clutch pedal free play (1" to 1-1/4" at the pedal); inadequate free play adjustment will cause premature failure of the throwout bearing.Comment
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Re: I would still be looking at the clutch setup
Ross:
I helped a freind with a big-block 68 with only 33k miles and it did the exact same thing. After ten min.s driving you could not move the shifter, any where! We chaged the fluid to 85/120 and it completely solved the problem. Before we changed the fluid though I pulled the side cover (while hot) and looked closely at the sliders, the ones that the shift forks fit in, I could not move them even with a screwdriver. They were loose on the spline area and would get cocked easily. I put the new oil on them and after moving them two times they were smooth as glass. that's why we changed the oil! The old oil was still clean but very thin and runny. I still think that the sliders were mismatched to the hubs and that was the real problem, but the oil fixed it up great!.
The car belonged to a Bloomington midyear judge -----Keith Majure----we were both dumnfounded when it worked so well. DavidComment
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Re: Would differential posi lube assist ?
Would posi lube be of any benefit you think John?Comment
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