C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

4 speed shifter problems in first and second gears

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Old May 12, 2009 | 09:01 AM
  #1  
Larston's Avatar
Larston
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Default 4 speed shifter problems in first and second gears

Hi all, first post. I picked up my 85 (my first Vette) a few days ago. It seems that I may have a problem in the shifter but I need to know what's normal. It's really tricky to find first gear when sitting still. From neutral, I can wiggle things around enough that it will eventually drop in. Second gear seems to be unreachable with any confidence. It will shift from first to second when leaving a stop light, but I can't seem to get it back into second on a down shift or when sitting still. It also won't downshift directly from second to first, I have to mess around in neutral again. The shifter does drop into reverse very easily and third and fourth gears are no problem.

Any thought, hints, tips, tricks, links??
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Old May 12, 2009 | 10:31 AM
  #2  
MBDiagMan's Avatar
MBDiagMan
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From: Sumner Texas
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It's hard to say without actually being AT the car, but I fully expect that you do not have a shifter problem, rather you have a clutch problem.

Start by checking the clutch reservoir to make sure it's full of fluid. With fluid topped off, you will need to bleed the clutch system. Don't overlook the rubber hose on the slave cylinder line. This hose is subject to LOTS of heat due to it's proximity to one of the cats.

I fully expect that with the clutch hydraulics taken care of, your problem will go away.

Keep us posted.
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Old May 12, 2009 | 02:31 PM
  #3  
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Larston
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Originally Posted by MBDiagMan
It's hard to say without actually being AT the car, but I fully expect that you do not have a shifter problem, rather you have a clutch problem.

Start by checking the clutch reservoir to make sure it's full of fluid. With fluid topped off, you will need to bleed the clutch system. Don't overlook the rubber hose on the slave cylinder line. This hose is subject to LOTS of heat due to it's proximity to one of the cats.

I fully expect that with the clutch hydraulics taken care of, your problem will go away.

Keep us posted.
Not that. The clutch works perfectly. It's definitely something strange in the gates of the shifter. It feels like the gate is not a true H-pattern on downshifts. I had it out for lunch again and played some more with the shifter. The window to get the shifter into first or second gear is very narrow, and the two are in different places slightly above and below a center point. It acts differently on the one-two upshift.

Could this be a worn reverse lockout mechanism???
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Old May 12, 2009 | 06:30 PM
  #4  
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powerpigz-51
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From: Chewelah Wa
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My first thought was the clutch also....but if you insist that it is working properly, you can try to adjust the shift linkages. The proper way is to insert a drill bit into the side of the shifter, which lines up all the gates in neutral, then you adjust linkages from there. But access to do this sucks, so I just adjust them with the stick in neutral (it is easier if you have someone to hold the stick in one spot) and guess. The tranny levers also must be in neutral. If you mess around with it long enough, you will get it right. You will see once you are under there what needs to be done.
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