t56 no reverse issue
Thread Starter
Intermediate
Joined: Oct 2021
Posts: 42
Likes: 3
From: Mississippi
t56 no reverse issue
i have an 05 vette with a t56 and i can go in reverse fine and smooth when the car is off but if it is running then 9/10 times it wont go in. i have changed the lockout solenoid.
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Do a ranger bleed on the slave cylinder fluid, which may help if the fluid is dirty and slave not getting a full throw to fully disengage the clutch.
If not, then its a problem with the reverse syncro in the trans if you can get to the actual reverse gate, but not the final throw to get it into reverse instead.
If not, then its a problem with the reverse syncro in the trans if you can get to the actual reverse gate, but not the final throw to get it into reverse instead.
Thread Starter
Intermediate
Joined: Oct 2021
Posts: 42
Likes: 3
From: Mississippi
I have flushed the clutch fluid multiple times. If it was the synchro would it be going in smooth when it does go and it always goes in when the car is off?
Do a ranger bleed on the slave cylinder fluid, which may help if the fluid is dirty and slave not getting a full throw to fully disengage the clutch.
If not, then its a problem with the reverse syncro in the trans if you can get to the actual reverse gate, but not the final throw to get it into reverse instead.
If not, then its a problem with the reverse syncro in the trans if you can get to the actual reverse gate, but not the final throw to get it into reverse instead.
Last edited by eisworthr; May 18, 2023 at 08:31 AM.
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
https://i.ebayimg.com/images/g/EZ4AA...Oy/s-l1600.jpg
Brass synchro is the reverse gear,and the lower photo is what is has to mate up against on the other side of it.
So as the brass inner three slots elongate in the first link, it can over rotate to end up with tooth against tooth tip on the other side to the mating gear, and when the trans is turning, will not final engagement since its bound teeth tip to tip to not allow the syncro to back rotate to slip in. When you shut the motor off, then do not have that rotation force pushing the gears tooth to tooth tips index, and the gear can back kick with ease, to allow it to engage.
Simply, if it was grinding going into gear, then would be the friction disc that is worn to not allow the gears to speed match, but its slot channel wear to allow it to over rotation to teeth to teeth index that is not allowing it to back blip enough to engage when the trans is turning instead.
As for the sad part, trans has to come apart to replace the brass reverse gear, and at that point, may as well refresh the rest of the trans parts as well. If can pull a trans from the car and apart, its about a $100 fix between gear/ fluid/gaskets, while if you are having someone else do the work, $1K to pull and replace the trans, and about another $2500 to pull the trans to refresh instead..
Brass synchro is the reverse gear,and the lower photo is what is has to mate up against on the other side of it.
So as the brass inner three slots elongate in the first link, it can over rotate to end up with tooth against tooth tip on the other side to the mating gear, and when the trans is turning, will not final engagement since its bound teeth tip to tip to not allow the syncro to back rotate to slip in. When you shut the motor off, then do not have that rotation force pushing the gears tooth to tooth tips index, and the gear can back kick with ease, to allow it to engage.
Simply, if it was grinding going into gear, then would be the friction disc that is worn to not allow the gears to speed match, but its slot channel wear to allow it to over rotation to teeth to teeth index that is not allowing it to back blip enough to engage when the trans is turning instead.
As for the sad part, trans has to come apart to replace the brass reverse gear, and at that point, may as well refresh the rest of the trans parts as well. If can pull a trans from the car and apart, its about a $100 fix between gear/ fluid/gaskets, while if you are having someone else do the work, $1K to pull and replace the trans, and about another $2500 to pull the trans to refresh instead..
Last edited by Dano523; May 18, 2023 at 02:13 PM.
Thread Starter
Intermediate
Joined: Oct 2021
Posts: 42
Likes: 3
From: Mississippi
if it was synchros would it not grind when it does go in when running? On the few times it ends up going in to reverse while running it is smooth as can be
https://i.ebayimg.com/images/g/EZ4AA...Oy/s-l1600.jpg
Brass synchro is the reverse gear,and the lower photo is what is has to mate up against on the other side of it.
So as the brass inner three slots elongate in the first link, it can over rotate to end up with tooth against tooth tip on the other side to the mating gear, and when the trans is turning, will not final engagement since its bound teeth tip to tip to not allow the syncro to back rotate to slip in. When you shut the motor off, then do not have that rotation force pushing the gears tooth to tooth tips index, and the gear can back kick with ease, to allow it to engage.
Simply, if it was grinding going into gear, then would be the friction disc that is worn to not allow the gears to speed match, but its slot channel wear to allow it to over rotation to teeth to teeth index that is not allowing it to back blip enough to engage when the trans is turning instead.
As for the sad part, trans has to come apart to replace the brass reverse gear, and at that point, may as well refresh the rest of the trans parts as well. If can pull a trans from the car and apart, its about a $100 fix between gear/ fluid/gaskets, while if you are having someone else do the work, $1K to pull and replace the trans, and about another $2500 to pull the trans to refresh instead..
Brass synchro is the reverse gear,and the lower photo is what is has to mate up against on the other side of it.
So as the brass inner three slots elongate in the first link, it can over rotate to end up with tooth against tooth tip on the other side to the mating gear, and when the trans is turning, will not final engagement since its bound teeth tip to tip to not allow the syncro to back rotate to slip in. When you shut the motor off, then do not have that rotation force pushing the gears tooth to tooth tips index, and the gear can back kick with ease, to allow it to engage.
Simply, if it was grinding going into gear, then would be the friction disc that is worn to not allow the gears to speed match, but its slot channel wear to allow it to over rotation to teeth to teeth index that is not allowing it to back blip enough to engage when the trans is turning instead.
As for the sad part, trans has to come apart to replace the brass reverse gear, and at that point, may as well refresh the rest of the trans parts as well. If can pull a trans from the car and apart, its about a $100 fix between gear/ fluid/gaskets, while if you are having someone else do the work, $1K to pull and replace the trans, and about another $2500 to pull the trans to refresh instead..
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Skip to 5:30
Here is the fix if you want to repair the trans yourself (replace the worn out bronze blocker ring) and best to replace the clutch packs at the same time, as well as any other parts that are worn while you have the case open).
Here is the fix if you want to repair the trans yourself (replace the worn out bronze blocker ring) and best to replace the clutch packs at the same time, as well as any other parts that are worn while you have the case open).
Last edited by Dano523; Jul 2, 2023 at 03:20 AM.