locked out of 3rd gear
08-20-2008, 11:04 PM
#1
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locked out of 3rd gear I just got back from the track and am baffled. every time i try to shift into 3rd at redline, it "locks" me out of 3rd until i let off and the rpms drop then it lets me go in just fine. any guesses what is wrong? it does the same thing on the street. I have a built tranny with a pro 5.0
08-21-2008, 12:00 AM
#2
Its prolly this(from the Manual Trans FAQ sticky) :
To sum it up, basically GM didn’t think things through all the way when selecting the hydraulic lines for your T56. The steel braided line that plugs into the master cylinder has a tiny, tiny hole in it, which causes unnecessary restriction. During a quick, high-rpm shift, fluid cannot get where it needs to go fast enough, so basically it will feel like you are shifting without a clutch. It may be difficult or impossible to shift into 2nd or 3rd, and you may have some problems with the pedal itself.
When performing the drill mod, you remove the master cylinder, separate the line from the cylinder, and drill it out. To visit a site with full information and pictures, click HERE. It will be listed under the Transmission section, along with the adjustable master cylinder install (although you can do the drill mod without changing the master).
When performing the drill mod, you remove the master cylinder, separate the line from the cylinder, and drill it out. To visit a site with full information and pictures, click HERE. It will be listed under the Transmission section, along with the adjustable master cylinder install (although you can do the drill mod without changing the master).
08-21-2008, 09:07 AM
#4
check for clutch drag, though not sure why that would affect only 3rd.. How many passes on the built trans, and how many missed 3rd gear shifts? Could be that the blocker is just worn enough that it can't effectively synchronize 3rd at higher RPMs.
Do you downshift often on the street, without rev-matching?
Do you downshift often on the street, without rev-matching?
Last edited by 85MikeTPI; 08-21-2008 at 02:08 PM.
08-24-2008, 11:34 PM
#7
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check for clutch drag, though not sure why that would affect only 3rd.. How many passes on the built trans, and how many missed 3rd gear shifts? Could be that the blocker is just worn enough that it can't effectively synchronize 3rd at higher RPMs.
Do you downshift often on the street, without rev-matching?
Do you downshift often on the street, without rev-matching?
I'm not sure how many passes were made on the transmission before I bought it but i have 2 passes on it at the track and probably 4 or so on the street trying to figure out why it won't allow me to go into 3rd at high rpms. so, to answer your question, around 6. same result every time.
not to sound stupid, but what exactly is the blocker?
Whenever I significantly downshift on the street, i always rev match
