Grinding noise in reverse - Vintage Mustang Forums
 
Thread Tools
post #1 of 14 (permalink) Old 04-26-2018, 07:13 PM Thread Starter
Junior Member
 
rfollwe1's Avatar
 
Join Date: Oct 2004
Location: Allentown, PA
Posts: 12
Grinding noise in reverse

Hey Guys,

I pulled my 67 out of the garage to do a parts run tonight. When I put in reverse I heard a grinding noise. I thought maybe u joint was bad, but still heard the grinding when stopped. I blocked the rear wheel and put it in reverse. Drive shaft not moving but still grinding noise. Car has C4 and 8" limited slip. Any ideas? Thanks, Rich

rfollwe1
67 GTA Mustang, Fastback, A-Code,
Candy Apple Red/Red Deluxe Interior
rfollwe1 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old 04-26-2018, 08:38 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,781
Weíll reverse doesnít have a synchronizer for one thing so you can get some grinding. The other your clutch may be dragging, meaning not fully disengaging due to adjustment, wear or sticking

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #3 of 14 (permalink) Old 04-26-2018, 09:26 PM
Senior Member
 
awhtx's Avatar
 
Join Date: Sep 2011
Location: The Hill Country of Central Texas
Posts: 9,164
Since the OP states that "car has C4" I don't think it's a synchronizer or clutch problem.

Is the starter completely disengaging from the flexplate after the engine starts?
awhtx is offline  
 
post #4 of 14 (permalink) Old 04-26-2018, 09:26 PM
Senior Member
 
Dave R.'s Avatar
 
Join Date: Apr 2014
Location: Fairfield, Ohio
Posts: 538
Quote:
Originally Posted by Huskinhano View Post
Weíll reverse doesnít have a synchronizer for one thing so you can get some grinding. The other your clutch may be dragging, meaning not fully disengaging due to adjustment, wear or sticking
I'm pretty sure that a C4 has no clutch as well. Dave R.
Dave R. is offline  
post #5 of 14 (permalink) Old 04-26-2018, 09:39 PM Thread Starter
Junior Member
 
rfollwe1's Avatar
 
Join Date: Oct 2004
Location: Allentown, PA
Posts: 12
It sounds like it's coming from the rear of the car. But since driveshaft isn't moving I'm stumped. I'll put is up on jack stands this weekend.

rfollwe1
67 GTA Mustang, Fastback, A-Code,
Candy Apple Red/Red Deluxe Interior
rfollwe1 is offline  
post #6 of 14 (permalink) Old 04-26-2018, 09:45 PM
Senior Member
 
Paul1958's Avatar
 
Join Date: Nov 2010
Location: E. MA
Posts: 5,737
Quote:
Originally Posted by rfollwe1 View Post
It sounds like it's coming from the rear of the car. But since driveshaft isn't moving I'm stumped. I'll put is up on jack stands this weekend.
Sound can bounce around off the underbody. Probably coming from the rear of the C4.

Paul

Okay. Engine Stop. ACA out of Detent. Mode Control, both Auto. Descent Engine Command Override, Off. Engine Arm, Off. 413 is in.
-Buzz Aldrin, Apollo 11 LMP
Actual first words from the surface of the moon

Early Fox: 5.0L HO SEFI conversion, 5-speed, 8.8 w/3.27:1 TL, full dual exhaust

1968 coupe - Ordered 12.15.67 Delivered 2.1.68: 8T01T, 65C, 289 conversion, hanger queen
Paul1958 is offline  
post #7 of 14 (permalink) Old 04-26-2018, 10:50 PM
Senior Member
 
Dave R.'s Avatar
 
Join Date: Apr 2014
Location: Fairfield, Ohio
Posts: 538
The noise can't originate in the rear end if the noise is present without the driveshaft turning. I'm not a trans guru but does the noise go away in neutral and drive? Noisy in reverse only? Cross member bolts loose? Flexplate bolts? Just spitballing here. Dave R.
Dave R. is offline  
post #8 of 14 (permalink) Old 04-26-2018, 11:05 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,781
Quote:
Originally Posted by Dave R. View Post
I'm pretty sure that a C4 has no clutch as well. Dave R.
LOL, major brain fart. Donít know what I was thinking. Obviously I wasnít. At least it was good for a laugh

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #9 of 14 (permalink) Old 04-26-2018, 11:24 PM
Senior Member
 
awhtx's Avatar
 
Join Date: Sep 2011
Location: The Hill Country of Central Texas
Posts: 9,164
Quote:
Originally Posted by Huskinhano View Post
LOL, major brain fart. Donít know what I was thinking. Obviously I wasnít. At least it was good for a laugh
Welcome to the world of "old age"!
awhtx is offline  
post #10 of 14 (permalink) Old 04-27-2018, 12:10 AM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,781
Quote:
Originally Posted by awhtx View Post
Welcome to the world of "old age"!
Ainít that the truth!

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #11 of 14 (permalink) Old 04-27-2018, 12:36 AM
Senior Member
 
Join Date: Mar 2016
Location: California
Posts: 615
Garage
Transmission fluid

Quote:
Originally Posted by rfollwe1 View Post
Hey Guys,

I pulled my 67 out of the garage to do a parts run tonight. When I put in reverse I heard a grinding noise. I thought maybe u joint was bad, but still heard the grinding when stopped. I blocked the rear wheel and put it in reverse. Drive shaft not moving but still grinding noise. Car has C4 and 8" limited slip. Any ideas? Thanks, Rich
I had a 68 Mustang with a C4 and I remember the tranny making a ratchety grind noise the first time that I would put it into gear or reverse while the car was in park. It ended up being low on tranny fluid. You probably already checked the fluid, but worth mentioning.
image98 is offline  
post #12 of 14 (permalink) Old 04-27-2018, 07:18 AM Thread Starter
Junior Member
 
rfollwe1's Avatar
 
Join Date: Oct 2004
Location: Allentown, PA
Posts: 12
I'm hoping low fluid is the issue. I do have a persistent pan leak. I ordered a new pan and will install it this weekend. Thanks.

rfollwe1
67 GTA Mustang, Fastback, A-Code,
Candy Apple Red/Red Deluxe Interior
rfollwe1 is offline  
post #13 of 14 (permalink) Old 04-27-2018, 09:56 AM
Senior Member
 
Dave R.'s Avatar
 
Join Date: Apr 2014
Location: Fairfield, Ohio
Posts: 538
Quote:
Originally Posted by Huskinhano View Post
LOL, major brain fart. Donít know what I was thinking. Obviously I wasnít. At least it was good for a laugh

Husky, I am not laughing at you but I am laughing with you. I'll be 66 next month so I know from where you speak. Dave R.
Dave R. is offline  
post #14 of 14 (permalink) Old 04-27-2018, 04:46 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,781
Quote:
Originally Posted by Dave R. View Post
Husky, I am not laughing at you but I am laughing with you. I'll be 66 next month so I know from where you speak. Dave R.
Oh no, I knew you were laughing with me. Iím 62.

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Vintage Mustang Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome