Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

Grinding into 4th????

Thread Tools
 
Search this Thread
 
Old Sep 12, 2008 | 05:55 PM
  #1  
Ilikeppie's Avatar
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2007
Posts: 409
Likes: 0
From: Fort Collins, Colorado Springs
Question Grinding into 4th????

So about 5000 miles ago i put in a bran new textrallia clutch and flywheel, everything has been great now every now i am getting a pretty good vibration/rattle that i think is the tail shaft of the transmission and it grinds every time i shift to fourth unless i let the rpm come all the way back to idle before i push it into fourth also the clutch engages right off the floor wondering if the clutch is having a problem or if its just the tranny needing rebuilt thanks for any input.
Reply
Old Sep 12, 2008 | 09:41 PM
  #2  
thesource's Avatar
Banned
iTrader: (60)
 
Joined: Mar 2005
Posts: 2,693
Likes: 0
From: Adkins - Tx
Default

Typically a transmission grinds in 4th gear if the pilot bearing has issues but it could also be a failing 4th gear syncro . A basic over haul should resolve the issues for you .
Reply
Old Sep 17, 2008 | 02:16 AM
  #3  
Ilikeppie's Avatar
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2007
Posts: 409
Likes: 0
From: Fort Collins, Colorado Springs
Default

ok so more information on the issue today as i was setting in the car i was getting a pretty bad rattle from what sounded like where the clutch is i always figured it might be the drive shaft out of balance but it was doing it while i was parked with the engine running clutch in out in gear out of gear it didnt make any difference.
Reply
Old Sep 17, 2008 | 09:52 AM
  #4  
DopdBrd's Avatar
TECH Addict
iTrader: (25)
 
Joined: Nov 2004
Posts: 2,529
Likes: 0
From: Garden City, KS
Default

I was just about ready to make a thread about this....

I replaced my tranny, clutch, throwout bearing, pilot bearing and resurfaced my flywheel. Everything is running great......well it was.

This morning driving to work I let the RPM's get over 3K before shifting into 4th and when I did it grinded really bad. That is the only gear it does it in and it will only do it if I shift fast or shift high in the powerband.

I rebuilt the Tranny with a Tick Performance stage 2 kit. The clutch does engage right off the floor also.

Any help would be appreciated guys.
Reply
Old Sep 17, 2008 | 10:01 AM
  #5  
Jonathan@Tick's Avatar
LS1TECH Sponsor
iTrader: (5)
 
Joined: Jul 2004
Posts: 932
Likes: 1
From: Mooresville, NC
Default

Originally Posted by DopdBrd
I was just about ready to make a thread about this....

I replaced my tranny, clutch, throwout bearing, pilot bearing and resurfaced my flywheel. Everything is running great......well it was.

This morning driving to work I let the RPM's get over 3K before shifting into 4th and when I did it grinded really bad. That is the only gear it does it in and it will only do it if I shift fast or shift high in the powerband.

I rebuilt the Tranny with a Tick Performance stage 2 kit. The clutch does engage right off the floor also.

Any help would be appreciated guys.
If the clutch engages really close to the floor, see if you can tell if its dragging. With the car sitting on level ground and the transmission in first gear, and clutch pedal pressed all the way down rev the engine to 5000+ rpms and see if the car tries to creep foward. If it does, you're not getting a complete release and that could be the cause of your grind.
Reply
Old Sep 17, 2008 | 10:27 AM
  #6  
DopdBrd's Avatar
TECH Addict
iTrader: (25)
 
Joined: Nov 2004
Posts: 2,529
Likes: 0
From: Garden City, KS
Default

Originally Posted by Jonathan@Tick
If the clutch engages really close to the floor, see if you can tell if its dragging. With the car sitting on level ground and the transmission in first gear, and clutch pedal pressed all the way down rev the engine to 5000+ rpms and see if the car tries to creep foward. If it does, you're not getting a complete release and that could be the cause of your grind.
First question, I've only got about 40 miles on the new clutch and tranny rebuild. Will it be ok to take it up to 5000 RPM before it is fully broken in???

Second question, will an adjustable MC take care of the problem??? I have a brand new GM one I did the drill mod on, so I will just make it adjustable.
Reply
Old Sep 17, 2008 | 10:54 AM
  #7  
Ilikeppie's Avatar
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2007
Posts: 409
Likes: 0
From: Fort Collins, Colorado Springs
Default

DopdBrd it will not hurt the new clutch or tanny to do this as you will not let up on the clutch pedal while in the high rpm therefor power will not go through your drive train. Jonathan@tick i have done this many times i am getting fully engaged as it will no creep no matter how high i rev it in gear with the clutch pedal down so i am at a loss about to just rip the tranny out of there and see what i can find
Reply
Old Sep 17, 2008 | 10:59 AM
  #8  
nobird8991's Avatar
Launching!
iTrader: (4)
 
Joined: Feb 2007
Posts: 216
Likes: 0
From: st. paul, Minnesota
Default

having delt with the same problem and working with a clutch system as much as i have been the last year or so i would say you need to either

bleed the clutch line and i would take the master and tip it up and push in the master cylinder and have someone look if you have bubbles come out the resivour. but since that is such a pain in the a$$ it might be worth buying ADJUSTABLE master cylinder. that is what i did. i bought the mcCloyd adjustable master and when i took the old one out i had a bunch of bubbles come out of the cylinder up to the resivour that was causing my peddle engagement to be on the floor and it sucked!!!!

putting a new adjustable master in there should solve this problem and take care of anything down the road. its so nice being able to adjust that to where I want it i love it. moved it twice already since i put it in this spring
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Sep 17, 2008 | 02:45 PM
  #9  
DopdBrd's Avatar
TECH Addict
iTrader: (25)
 
Joined: Nov 2004
Posts: 2,529
Likes: 0
From: Garden City, KS
Default

I just did the 5000 RPM test and it did not go anywhere.

So before I tear out my brand new MC and make it adjustable, is this what is causing it or could it be something else?
Reply
Old Sep 17, 2008 | 06:03 PM
  #10  
Ilikeppie's Avatar
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2007
Posts: 409
Likes: 0
From: Fort Collins, Colorado Springs
Default

im not too sure what to tell you as i am in the same boat from what i have heard about is either the adjustable master or maybe the syncro is going bad and the tranny needs a overhaul.
Reply
Old Sep 17, 2008 | 08:00 PM
  #11  
nobird8991's Avatar
Launching!
iTrader: (4)
 
Joined: Feb 2007
Posts: 216
Likes: 0
From: st. paul, Minnesota
Default

if this is a problem that just started out of no where then i would put money on it being new part issues not the transmission. if you just put a brand new master cylinder in it and its now causing issues like low pedal engagement and grinds gears its because you're not getting full pedal and as soon as that clutch fluid gets a little warmer you're gonna lose even more pedal. jack the front end of the car up and unbolt the master from the fire wall tip it up as much as you can and see if any bubbles come out of it. works best to have someone help watch. you should also try and push it in while dismounted and tipped up. so have someone hold it or find a way for them to hold it in place while pushing the master in by hand.

the clutch line should be hooked up the whole time. the master will not compress with the line off.
Reply
Old Sep 18, 2008 | 10:05 AM
  #12  
DopdBrd's Avatar
TECH Addict
iTrader: (25)
 
Joined: Nov 2004
Posts: 2,529
Likes: 0
From: Garden City, KS
Default

I know its not the tranny because I just rebuilt it.

I'm gonna try and bleed the clutch, if that don't work then I guess I am making it adjustable.
Reply
Old Sep 18, 2008 | 10:18 AM
  #13  
nobird8991's Avatar
Launching!
iTrader: (4)
 
Joined: Feb 2007
Posts: 216
Likes: 0
From: st. paul, Minnesota
Default

Originally Posted by DopdBrd
I know its not the tranny because I just rebuilt it.

I'm gonna try and bleed the clutch, if that don't work then I guess I am making it adjustable.
i would go the extra step to dismount it from the car and tip it up and hand bleed it it may just save the headache it causes lol.

if the resivor got dry at all during clutch install and such the master probably got air-locked. i went thru it as well. was gonna go thru the work of taking it out and bleeding it but it can be a hassle and i was not sure at all so i bought an adjustable. during removal i tipped it up to get it out and got a bunch of bubbles out of it
Reply
Old Sep 19, 2008 | 06:51 AM
  #14  
Plan B's Avatar
TECH Enthusiast
 
Joined: Nov 2001
Posts: 534
Likes: 0
From: Sydney Australia
Default

Originally Posted by thesource
Typically a transmission grinds in 4th gear if the pilot bearing has issues but it could also be a failing 4th gear syncro . A basic over haul should resolve the issues for you .
Perfect answer! I'd also look at the main carrier bearing.... !

Pete
Reply
Old Sep 19, 2008 | 04:41 PM
  #15  
Ilikeppie's Avatar
Thread Starter
TECH Regular
iTrader: (5)
 
Joined: Dec 2007
Posts: 409
Likes: 0
From: Fort Collins, Colorado Springs
Default

Alright Guys I checked out the car a bit more and realized that the rattle i was hearing is just the torque arm. however my clutch is not fully disengaging because i lifted up the rear axle got the tires off the ground and put it in gear and the tires started turning so from this comes my question how do i make the clutch fully disengage? Adjustable master cylinder?
Reply




All times are GMT -5. The time now is 12:03 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE