1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Changing drive shaft

Thread Tools
 
Search this Thread
 
Old Nov 11, 2005 | 04:09 PM
  #1  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Question Changing drive shaft

'85 GSL has a terrible vibration when driving off or reversing from a dead stop. There is no vibration in all other gears. Front u-joint must be shot.

From what I've read there are three options:

-buy new driveshaft
-salvage used driveshaft
-send driveshaft out for repair

The problem I have is what do I plug the hole with while the shaft is out?
Reply
Old Nov 11, 2005 | 04:12 PM
  #2  
Alex-7's Avatar
Rotary Freak
Tenured Member 15 Years
 
Joined: Dec 2003
Posts: 2,117
Likes: 2
From: Waukesha Wisconsin
From a dead stop? Any possibility it's clutch chatter?

I'd pull your old one off, take it to a machine shop and have a new one made.
Reply
Old Nov 11, 2005 | 04:22 PM
  #3  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Not to sure if it's clutch chatter until I get under the car and take a look at the driveshaft. From what I understand the u-joint will be dry and have a sloppy feel. All the research I've done so far indicates a bad front u-jojnt.

What would clutch chatter do?
Reply
Old Nov 11, 2005 | 04:31 PM
  #4  
Alex-7's Avatar
Rotary Freak
Tenured Member 15 Years
 
Joined: Dec 2003
Posts: 2,117
Likes: 2
From: Waukesha Wisconsin
If it was clutch/flywheel related, I'd imagine it would be more of a "vibration"


Good luck
Reply
Old Nov 11, 2005 | 04:35 PM
  #5  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Well it only vibrates from a dead stop for a second or two. Never in any other gears other than 1st or reverse.

So, what should I plug the hole with, once I pull the driveshaft?
Reply
Old Nov 11, 2005 | 04:37 PM
  #6  
Alex-7's Avatar
Rotary Freak
Tenured Member 15 Years
 
Joined: Dec 2003
Posts: 2,117
Likes: 2
From: Waukesha Wisconsin
Whatever fits!
Reply
Old Nov 11, 2005 | 04:40 PM
  #7  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Yes, but I have to be able to WALK AWAY from the car after it's plugged!!!


lol
Reply
Old Nov 11, 2005 | 04:42 PM
  #8  
K-Tune's Avatar
FD Daily
Tenured Member: 20 Years
iTrader: (27)
 
Joined: Jul 2003
Posts: 3,308
Likes: 14
From: Gulf Breeze, FL
stuff a rag in and set newspaper under it.


Reply
Old Nov 11, 2005 | 04:44 PM
  #9  
Alex-7's Avatar
Rotary Freak
Tenured Member 15 Years
 
Joined: Dec 2003
Posts: 2,117
Likes: 2
From: Waukesha Wisconsin
Originally Posted by Dom
Yes, but I have to be able to WALK AWAY from the car after it's plugged!!!


lol

LMAO.
Reply
Old Nov 11, 2005 | 04:46 PM
  #10  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Originally Posted by FBDrifter
stuff a rag in and set newspaper under it.



Well if that's all it takes thanks a bunch! I knew the FSM specialty tool was load of ....

So now I'm off to find my left handed metric adjustable.
Reply
Old Nov 11, 2005 | 06:16 PM
  #11  
bliffle's Avatar
Rotary Freak
Tenured Member 10 Years
 
Joined: Sep 2002
Posts: 2,815
Likes: 0
From: SF BayArea
Mazdatrix has an aftermarket propshaft for $250.

As I recall, all the bad UJoints I've replaced have been rear UJoints.

You might consider a new trans mount: $28 from rockauto.com

b
Reply
Old Nov 11, 2005 | 06:48 PM
  #12  
trochoid's Avatar
Old Fart Young at Heart
Tenured Member 10 Years
iTrader: (6)
 
Joined: Apr 2004
Posts: 15,145
Likes: 8
From: St Joe MO
Iirc, someone said the plastic cap from a spray can would fit. The only thing that's going to happen is the fliud will drain a bit. You can always catch that and refill after the shaft is reinstalled.
Reply
Old Nov 11, 2005 | 07:29 PM
  #13  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Originally Posted by trochoid
Iirc, someone said the plastic cap from a spray can would fit. The only thing that's going to happen is the fliud will drain a bit. You can always catch that and refill after the shaft is reinstalled.
That's what I understand, but I just didn't know how much or how fast. I don't want to be under there in a flow of tranny fluid.

Seems though that we are talking about drips...
Reply
Old Nov 11, 2005 | 07:59 PM
  #14  
trochoid's Avatar
Old Fart Young at Heart
Tenured Member 10 Years
iTrader: (6)
 
Joined: Apr 2004
Posts: 15,145
Likes: 8
From: St Joe MO
Less than half of the 2+ qts. that are in the tranny. I like the new Folgers plastic coffee cans, they will hold all of the tranny fluid, when draining, snap the lid back on, then set aside until your ready to refill.
Reply
Old Nov 11, 2005 | 08:07 PM
  #15  
kgray's Avatar
GOT WANKEL?
Tenured Member 10 Years
 
Joined: Jan 2005
Posts: 1,324
Likes: 1
From: Kansas City, MO
yes, those red ones. i used it to hold brake fluid for bleeding.
Reply
Old Nov 11, 2005 | 10:21 PM
  #16  
Kentetsu's Avatar
Lives on the Forum
Tenured Member 15 Years
 
Joined: Jun 2004
Posts: 11,359
Likes: 14
From: Grand Rapids Michigan
Use the small cap from a can of carb cleaner, its a perfect fit from what I understand...
Reply
Old Nov 11, 2005 | 11:55 PM
  #17  
Whanrow's Avatar
Certified Old Fart
Tenured Member 10 Years
 
Joined: Oct 2004
Posts: 490
Likes: 0
From: Inkerman, On, South of Ottawa, the 2nd coldest Capital in the World
I don't know guys, what I've done on any car I've changed u-joints on is simply back the car on to ramps so its nose down. Pull the shaft, and presto, since the tranny is downhill, nothing comes out. Also makes it easier to get the shaft out.

Vibration just at start off doesn't sound a whole lot like u-joints. At least not any I've ever had wear out. You get a distinct clunk when first starting off, or switching to reverse, and a vibration at either a particular road speed, or all the time. I'd check them reall carefull before going to that expense. Any standard trans I've ever had will make this vibration from time to time, just depending on how you engage the clutch or if the flywheel is warped or the clutch burnt...
Reply
Old Nov 12, 2005 | 12:24 AM
  #18  
Kentetsu's Avatar
Lives on the Forum
Tenured Member 15 Years
 
Joined: Jun 2004
Posts: 11,359
Likes: 14
From: Grand Rapids Michigan
Good point.... Ujoints will usually clank at low speeds, and vibrate at high speeds. Might be another issue altogether...
Reply
Old Nov 12, 2005 | 01:03 AM
  #19  
bliffle's Avatar
Rotary Freak
Tenured Member 10 Years
 
Joined: Sep 2002
Posts: 2,815
Likes: 0
From: SF BayArea
Yep, UJoints clink for sure. And vibrate menacingly at road speed. I'm guessing it's that $28 transmission support.
Reply
Old Nov 12, 2005 | 03:53 AM
  #20  
kenn_chan's Avatar
Savanna Rx-7
Tenured Member: 20 Years
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 1,577
Likes: 12
From: yokosuka japan
Tokyo answering your call

Originally Posted by Dom
Yes, but I have to be able to WALK AWAY from the car after it's plugged!!!


lol

Dom, What were you planning on stuffing it with?

Kenn
Reply
Old Nov 12, 2005 | 11:04 AM
  #21  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Originally Posted by Whanrow
I don't know guys, what I've done on any car I've changed u-joints on is simply back the car on to ramps so its nose down. Pull the shaft, and presto, since the tranny is downhill, nothing comes out. Also makes it easier to get the shaft out.

Vibration just at start off doesn't sound a whole lot like u-joints. At least not any I've ever had wear out. You get a distinct clunk when first starting off, or switching to reverse, and a vibration at either a particular road speed, or all the time. I'd check them reall carefull before going to that expense. Any standard trans I've ever had will make this vibration from time to time, just depending on how you engage the clutch or if the flywheel is warped or the clutch burnt...
Keeping the job down to 2 jackstands per car would allow me to jack both cars up at once, the street car and the parts car. Sounds good to me.

My diagnosis was derived mostly from the Mazdatrix link in the FAQ:

http://www.mazdatrix.com/g2.htm

And then confirmed (?) with a search in the 1st gen section of this forum.

A driveshaft inspection seems to be a good place to start...
Reply
Old Nov 12, 2005 | 02:31 PM
  #22  
Kentetsu's Avatar
Lives on the Forum
Tenured Member 15 Years
 
Joined: Jun 2004
Posts: 11,359
Likes: 14
From: Grand Rapids Michigan
Park the car in 1st or reverse, then try pushing it to rock it back and forth. If the ujoints are bad, you'll be able to hear them clanking as it rocks.
Reply
Old Nov 12, 2005 | 03:32 PM
  #23  
Dom's Avatar
Dom
Thread Starter
callin' tokyo
Tenured Member 05 Years
 
Joined: Dec 2002
Posts: 1,353
Likes: 0
From: Windsor, Ontario
Originally Posted by Kentetsu
Park the car in 1st or reverse, then try pushing it to rock it back and forth. If the ujoints are bad, you'll be able to hear them clanking as it rocks.
Well that's a good hint.

To bad I just finnished putting my perfectly good driveshaft back on.

The transmission mount seems to be good too.

Only thing left is the transmission, maybe the differential.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
stickmantijuana
Microtech
30
Apr 23, 2016 06:37 PM
ncds_fc
New Member RX-7 Technical
1
Aug 15, 2015 10:06 AM




All times are GMT -5. The time now is 07:51 AM.