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

C4 stuck in reverse tree

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Old Jul 11, 2023 | 04:01 PM
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Default C4 stuck in reverse tree

I swapped my 4+3 for a good one, and now the shift lever is stuck in the reverse tree, so it can move into reverse and back into neutral, but not out of the "lockout zone," meaning it can't move sideways into the forward gears. I adjusted with the linkages with no luck, but I found that if I manually get under the car, I can disengage it from neutral into the forward gears and it will shift fine, but once it gets back into the reverse tree, it gets stuck there again. The reverse lockout also does not seem to work currently, since once it's in the forward gears, the collar does not need to be picked up to enter the reverse tree. I also disconnected the ignition lockout mechanism, since it didn't seem to work from the start (my key was able to be removed in any gear, which I don't mind). Playing with the ignition mechanism also does not fix the issue. I believe it's something to do with the lockout collar mechanism itself, and it looks like the collar does not get all the way back down, though I'm unsure. I've also tried a good amount of brute force, just seeing if anything will loosen up or fall into place but no dice. Any ideas on where to look next?
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Old Jul 11, 2023 | 04:10 PM
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If you have the FSM do the 'neutral alignment' using a properly fabricated key. A hacksawblade has been mentioned in the past as being very close to correct thickness and width. See the 7B section of the FSM, something near 7B-2 or 3 generally.

Do you have the FSM? What year?

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Old Jul 11, 2023 | 04:11 PM
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Sorry, forgot to mention the year. It's a 1985, and I do have the FSM and will check out that procedure. The car and the manual is currently at a friend's house so if you don't mind me asking, what does that procedure do exactly? Thank you for your help!
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Old Jul 11, 2023 | 04:15 PM
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Essentially if done properly the procedure will alighn all shifting rods etc. If you've a problem that you can correct 'under the car' I'd think it's certainly the proper 1st move. '85 FSM 7B-6



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Old Jul 11, 2023 | 04:16 PM
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Very interesting, I'll give that a shot and see if that helps. Thanks again!
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Old Jul 11, 2023 | 04:42 PM
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Originally Posted by winnie9200
Very interesting, I'll give that a shot and see if that helps. Thanks again!
090 thick X .650 wide X 3" long I've found mentioned. I've seen .100 or 1/8" also mentioned




Last edited by WVZR-1; Jul 11, 2023 at 07:30 PM.
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