.
4 Speed Reverse Grind
Thread Starter
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
4 Speed Reverse Grind
With my Muncie T-22 It seems every time i go to put it in reverse just as it goes in i get a small gear grind. This is confusing because the clutch pedal is fully depressed so there should be minimal connection... I understand that the reverse gear has no syncros but should this problem exist? It shifts fine 1 thru 4 with clutch depressed. For now i have been avoiding this by putting in reverse before i start but thats not always an option...
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
The grind into reverse (assuming you're not moving) is caused by the countershaft, input gear and clutch disk still spinning. Assuming that your clutch fully disengages and you're stopped, it should not be spinning unless you let the clutch pedal out in neutral. In that case, wait a few seconds for it to stop spinning and then into reverse, OR, with the clutch pedal depressed, select first or second gear momentarily and then quickly into reverse.
If the problem is still there, the clutch disk may be dragging even with the pedal fully depressed, and spins up when the shift lever is passing through neutral. In this case, check the clutch adjustment.
And if that didn't help, most likely your throwout bearing is installed incorrectly:
If the problem is still there, the clutch disk may be dragging even with the pedal fully depressed, and spins up when the shift lever is passing through neutral. In this case, check the clutch adjustment.
And if that didn't help, most likely your throwout bearing is installed incorrectly:
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
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
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Might be an indication of an upcoming problem also.
EDIT- Here is the GM clutch spindown test. This test indicates that the grinding should not happen even though you can stop it by going into any forward gear.
Last edited by ...Roger...; Jan 26, 2010 at 07:58 PM.
Melting Slicks
Joined: Sep 2005
Posts: 2,710
Likes: 901
From: Warminster PA
How did they come up with nine?
I suppose 10 was too long, 8 was too short and 11 is right out..........
Thread Starter
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
1. Fill the center of the pilot bushing with heavy duty axle grease.
2. find a flat punch or chisel handle that is barely smaller than the inside diameter of the pilot bushing.
3. Position the punch over the grease in the hole
4. hit it with a rubber mallet-- the bushing pops right out due to hydraulic pressure in the grease! Enjoy!
Also, if i wait the nine seconds i get no grind so i believe it is all in working order. thanks again guys
Drifting
Joined: Jan 2008
Posts: 1,962
Likes: 5
From: Schererville IN
9 seconds? That's just stupid! 
I had this same grind prior to replacing my clutch. After the clutch was replaced I get no grind what so ever. I tend to believe your clutch is not fully engaging.
I had this same grind prior to replacing my clutch. After the clutch was replaced I get no grind what so ever. I tend to believe your clutch is not fully engaging.
