Manual Transmission - Issues shifting into 1st & Reverse (Compilation thread)

[WJ43]

Its not a skip shift*in what I've read about the challenger* sense, its a downshift lockout apparently.

Which doesnt explain any of our Reverse issues, and its a Downshift only lockout. Shouldnt affect getting into 1st from a stop.

Looks like we could pull fuse 80 as a test though. I'm assuming because it's fused that it's a mechanical lockout, which means that a software glitch could cause it to engage. I don't know if it could engage once in gear but I don't see why not because it's probably a pin or gate block. That explain why turning the ignition on and off clears the lockout

Sponsored

 

[58Willys]

There is no clearance, the throw out bearing is always touching the pressure plate.

My post was referring to the clearance between the flywheel & friction disk.

 

[58Willys]

Its not a skip shift*in what I've read about the challenger* sense, its a downshift lockout apparently.

Which doesnt explain any of our Reverse issues, and its a Downshift only lockout. Shouldnt affect getting into 1st from a stop.

Not being able to shift to reverse rally points to a dragging clutch.

 

[58Willys]

When I get lockout, I can shut off the engine, shift smoothly into that gear and start it back up, lol

Again, if you can shift into a gear with engine off, but not with engine on; then the clutch is not fully disengaging. There could be many causes of this, but with folks bleeding the slave and then getting better shifting; all this points to poor hydraulic operation. I wish I had the time space to test all these wild theories of mine.

Hopefully someone like ACT MAN who has the equipment to test this stuff will dig into all this more.

 

[WJ43]

Again, if you can shift into a gear with engine off, but not with engine on; then the clutch is not fully disengaging. There could be many causes of this, but with folks bleeding the slave and then getting better shifting; all this points to poor hydraulic operation. I wish I had the time space to test all these wild theories of mine.

Hopefully someone like ACT MAN who has the equipment to test this stuff will dig into all this more.

I would think that partial clutch engagement would lead to grinding which no one has reported.

 

[Duece McCracken]

I would think that partial clutch engagement would lead to grinding which no one has reported.

Well, I guess there can be a sweet spot that is still within the range of the synchros ability to handle.

It's such an odd occurance. I'm tempted to start a shifting lockout journal, just to keep track of when/how and relevent factors.

Curious about bypassing those lockout solenoids just to rule them out.

 

[ski-line900]

Hopefully it's not a ton of wear on the synchros that they'll wear out prematurely. I saw you can buy the complete trans for 1500, I wonder how much a rebuild is.

Maybe I should buy one and keep it as backup lol.

 

[ajLEEP21]

I just jinxed myself when I thought there were no issues. Sometimes it’s doesn’t go into 1st at a stop and when shifting to 2nd a little difficult. When the car is off, it easily shift into 1st, etc. Will keep driving and monitoring.

 

[SadRobot]

I just jinxed myself when I thought there were no issues. Sometimes it’s doesn’t go into 1st at a stop and when shifting to 2nd a little difficult. When the car is off, it easily shift into 1st, etc. Will keep driving and monitoring.

What clutch and how many miles on it?

 

[ajLEEP21]

I have the ACT kit with about 13k miles on it. 68k miles on ODO. My fix is to put it in 4th then 1st. Ok so far. When the car is off, it goes through the gears smoothly.

edit: I’m now having issues putting in reverse. I have to put into another gear then in reverse. It also makes a weird sound sometimes when taking off on 1st.

 

[notthenewguy]

Again, if you can shift into a gear with engine off, but not with engine on; then the clutch is not fully disengaging. There could be many causes of this, but with folks bleeding the slave and then getting better shifting; all this points to poor hydraulic operation. I wish I had the time space to test all these wild theories of mine.

Hopefully someone like ACT MAN who has the equipment to test this stuff will dig into all this more.

my jeep shifts perfectly fine with the car off. All the gears go in perfectly smooth. When it’s on it’s really rough. Bleeding improves it but then it returns. Maybe I need to swap out my master cylinder. I already had a new slave put in. Would a stock slave cylinder with a CF master cylinder work? I think someone in this thread is running that setup. Might give it a shot next.

was also wondering, are all the people who are experiencing issues with the ACT clutch running the pro mass flywheel? Are the people running the street mass flywheel fine? Just a thought.

 

[autotragic]

Looks like we could pull fuse 80 as a test though. I'm assuming because it's fused that it's a mechanical lockout, which means that a software glitch could cause it to engage. I don't know if it could engage once in gear but I don't see why not because it's probably a pin or gate block. That explain why turning the ignition on and off clears the lockout

I'm just glad I've been vindicated here I kept telling people there was a block that kept you from going into first gear and I was told I was crazy or it was just the synchros not keeping up or whatever turns out no there is actually a "feature" in the transmission that does it and now we even have the dang wiring pinouts that control it.

I knew I wasn't crazy.

I'm not saying it's the underlying cause every time or even in any one particular instance but any system can fail and not always in ways you expect.

 

[ajLEEP21]

I would think that partial clutch engagement would lead to grinding which no one has reported.

This might be true bc sometimes when I depress the clutch into neutral it makes a clunking sound. Maybe the pad material is not great, wearing prematurely and not engaging as it was brand new. If the car is at a slow roll, it easily goes into 1st. It drives normal through all other gears.

 

[Duece McCracken]

Looks like we could pull fuse 80 as a test though. I'm assuming because it's fused that it's a mechanical lockout, which means that a software glitch could cause it to engage. I don't know if it could engage once in gear but I don't see why not because it's probably a pin or gate block. That explain why turning the ignition on and off clears the lockout

Most of my issues are with Reverse, but, I just yanked fuse 80 just to rule it out. No immediate cluster warnings or CEL. I'll keep everyone posted.

 

[gek]

my jeep shifts perfectly fine with the car off. All the gears go in perfectly smooth. When it’s on it’s really rough. Bleeding improves it but then it returns. Maybe I need to swap out my master cylinder. I already had a new slave put in. Would a stock slave cylinder with a CF master cylinder work? I think someone in this thread is running that setup. Might give it a shot next.

was also wondering, are all the people who are experiencing issues with the ACT clutch running the pro mass flywheel? Are the people running the street mass flywheel fine? Just a thought.

I would imagine, since other clutches (CFII and stock) have reports of doing the same thing, the street mass flywheel would likely do it too.

Sponsored