3 - 4 crunch!
Thread Starter
Advanced
Joined: Mar 2004
Posts: 63
Likes: 0
From: Montreal Quebec
3 - 4 crunch!
I was wondering if anybody else had this problem and how to solve it.
When I shift from 3rd to 4th at WOT above 6K RPM Its hard to go into 4th gear and results in a crunch/grinding. Even If I shift slowly!!.
- It doesnt do it under 6K.
- It doesnt do it in any other gear.
Are we talking syncros???
RM:csmile:
When I shift from 3rd to 4th at WOT above 6K RPM Its hard to go into 4th gear and results in a crunch/grinding. Even If I shift slowly!!.
- It doesnt do it under 6K.
- It doesnt do it in any other gear.
Are we talking syncros???
RM:csmile:
Pro
Joined: Jun 2007
Posts: 501
Likes: 3
From: Valdosta GA
I was wondering if anybody else had this problem and how to solve it.
When I shift from 3rd to 4th at WOT above 6K RPM Its hard to go into 4th gear and results in a crunch/grinding. Even If I shift slowly!!.
- It doesnt do it under 6K.
- It doesnt do it in any other gear.
Are we talking syncros???
RM:csmile:
When I shift from 3rd to 4th at WOT above 6K RPM Its hard to go into 4th gear and results in a crunch/grinding. Even If I shift slowly!!.
- It doesnt do it under 6K.
- It doesnt do it in any other gear.
Are we talking syncros???
RM:csmile:
Thread Starter
Advanced
Joined: Mar 2004
Posts: 63
Likes: 0
From: Montreal Quebec
GM dealer
The problem is that its under waranty for another 30 days but my dealer doesnt want to open up the trans. because he's not sure what it is and is afraid of wasting man hours.... he tried the car with me and shifted gears with no clutch showing me thats its not the syncros..
what should I do??
what should I do??
Advanced
Joined: Dec 2003
Posts: 62
Likes: 0
From: Houston TX
Somebody jump in here if I'm wrong, but doesn't shifting without the clutch (matching rpms between gears) bypass the synchros all together?
The job of the synchronizer is to bring the keys up to the speed of the next gear so that it slides in smoothly. You can do the job of the synchronizer yourself if you match the rev's between gears without using the clutch or double clutching. This would be like driving an old school truck from WWII era.
Sounds like the dealer is
ing you to me. If you search for synchros you'll find plenty of information on paper vs carbon fiber vs fluid etc.
If it only does it above 6K, the 3/4 synchro may just be a little worn.
The job of the synchronizer is to bring the keys up to the speed of the next gear so that it slides in smoothly. You can do the job of the synchronizer yourself if you match the rev's between gears without using the clutch or double clutching. This would be like driving an old school truck from WWII era.
Sounds like the dealer is
ing you to me. If you search for synchros you'll find plenty of information on paper vs carbon fiber vs fluid etc. If it only does it above 6K, the 3/4 synchro may just be a little worn.
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Burning Brakes
Joined: Nov 2007
Posts: 951
Likes: 2
From: Rochester MN
Gents,
Your grinding into 4th is caused by the synchronizer being overworked
by the 1/4 shift mode (cripple that feature!)... AND it requires major repair!!
Now my question, for those guys "in the know", is what it costs to remove/replace the transmission and either overhaul or replace?
I'm sure it's not cheap..
thanks
joe
Your grinding into 4th is caused by the synchronizer being overworked
by the 1/4 shift mode (cripple that feature!)... AND it requires major repair!!
Now my question, for those guys "in the know", is what it costs to remove/replace the transmission and either overhaul or replace?
I'm sure it's not cheap..
thanks
joe