T56 - 5th gear lockout
02-02-2018, 02:05 PM
#1
On The Tree
Thread Starter
T56 - 5th gear lockout I have a 2000 corvette, it's the standard T56, all original as far as I know. The car has a hurst short throw shifter, along with a tick master cylinder. The car engages in all gears until I try and go into 5th. It won't let it engage at all, I can try and push it to the right and up (Where 5th would be) but it's like im hitting a wall. The way to bypass this is to depress the clutch and rev the car and it will finally open up and I can get it into gear. Another way to bypass this issue is if I go into neutral, depress the clutch pedal, then back to 4th or 3rd gear (While keeping the pedal pushed in the whole time) and then eventually making my way to 5th gear and it will finally let me in. I've tried to research this issue as much as possible but everybody says they also have a grinding problem, or a issue with getting the car into reverse. I don't have any of those problems, just the sole issue of the car locking me out of 5th. 
. Any help would be extremely appreciated as I was just trying to sell the car and this issue has shown up. Thanks
EDIT : After thinking, could changing the trans fluid possibly help? Maybe it's very low? I probably should have mentioned that getting the car into gears/shifting can take some force, along with the fact shifting is very notchy in the car. I had just originally assumed it was the hurst short throw that is in the car. I was thinking of doing a basic shifter alignment and adding some Mobil 1 trans fluid. In hopes that something on the cheaper side could remedy my issue. Thoughts?
. Any help would be extremely appreciated as I was just trying to sell the car and this issue has shown up. ThanksEDIT : After thinking, could changing the trans fluid possibly help? Maybe it's very low? I probably should have mentioned that getting the car into gears/shifting can take some force, along with the fact shifting is very notchy in the car. I had just originally assumed it was the hurst short throw that is in the car. I was thinking of doing a basic shifter alignment and adding some Mobil 1 trans fluid. In hopes that something on the cheaper side could remedy my issue. Thoughts?
Last edited by Ls1Ryan2002; 02-06-2018 at 10:44 AM.
02-06-2018, 09:49 AM
#4
On The Tree
Thread Starter
02-06-2018, 10:04 AM
#5
On The Tree
Thread Starter
Is there a way to go about testing a bad blocker ring? Or if the teeth or squared off or does the trans need to be dropped from the car? I don't know if it is the syncro because it sometimes does engage, maybe it's failing... this is my first manual trans issue ive ever had so I'm not very educated with them, so excuse my lack of knowledge lol.
02-06-2018, 03:40 PM
#6
9 Second Club
If you aim for reverse, it should select reverse ( noting reverse lockout solenoid of course )
If you aim for 5th and get reverse...that is not good.
02-06-2018, 03:41 PM
#7
9 Second Club
Is there a way to go about testing a bad blocker ring? Or if the teeth or squared off or does the trans need to be dropped from the car? I don't know if it is the syncro because it sometimes does engage, maybe it's failing... this is my first manual trans issue ive ever had so I'm not very educated with them, so excuse my lack of knowledge lol.
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02-06-2018, 05:05 PM
#8
Teching In
Is there a way to go about testing a bad blocker ring? Or if the teeth or squared off or does the trans need to be dropped from the car? I don't know if it is the syncro because it sometimes does engage, maybe it's failing... this is my first manual trans issue ive ever had so I'm not very educated with them, so excuse my lack of knowledge lol.
if you pull it from the car you only only have to remove the tail housing to fix this as the 5th, 6th and reverse gear assemblies are in that area where 1-4 is all in the main case. If you have a bad 5th gear you can realistically take the trans out, remove the housing and have the synchro, gear and blocker changed in an hour or so taking your time. It will be obvious which of these 3 is worn once you’re in there. Since it’s a full block out and not a grind I’m thinking the blocker and synchro teeth are squared off. if it was grind it’s more likely the blocker ring is not speed matching the gear for smooth engagement. If you can do brakes you could do this. Probably the hardest part is having the discipline to keep everything in order to go back on in the correct order!
Here’s a pic of the 5th and 6th gear and synchro assy from my camaro..if I remember you just have to remove disassemble the main shaft down to the 5th and 6th cluster gear and a snap ring on the shift fork to get this out to R&R
good luck buddy!
02-08-2018, 09:39 AM
#9
On The Tree
Thread Starter
Ok, thanks for the info, I still have not gotten to the car as of yet because of work. I should get around to the car today.
02-08-2018, 09:41 AM
#10
On The Tree
Thread Starter
I’m assuming it’s your only complaint with the trans...
if you pull it from the car you only only have to remove the tail housing to fix this as the 5th, 6th and reverse gear assemblies are in that area where 1-4 is all in the main case. If you have a bad 5th gear you can realistically take the trans out, remove the housing and have the synchro, gear and blocker changed in an hour or so taking your time. It will be obvious which of these 3 is worn once you’re in there. Since it’s a full block out and not a grind I’m thinking the blocker and synchro teeth are squared off. if it was grind it’s more likely the blocker ring is not speed matching the gear for smooth engagement. If you can do brakes you could do this. Probably the hardest part is having the discipline to keep everything in order to go back on in the correct order!
Here’s a pic of the 5th and 6th gear and synchro assy from my camaro..if I remember you just have to remove disassemble the main shaft down to the 5th and 6th cluster gear and a snap ring on the shift fork to get this out to R&R
good luck buddy!
02-16-2018, 09:12 AM
#11
On The Tree
Thread Starter
Just to close, I had the first warm day in a while and I drove the car and not a single 5th gear problem. I was driving the car while it was extremely cold. I'd say it was a contributing factor. I plan on changing the trans fluid and just driving the car. Thanks to everyone for the replies, I enjoy learning from people that have some knowledge over the T56.