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Old 01-28-2013, 06:21 AM   #1
WadeTXGTO
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Need a little help with GTO in Dallas/Grapevine, new to town

I am in the process of relocating to Dallas, driving back and forth to Austin on weekends. Driving into work today, it sounds like I have something really loose in the driveline, like a worn u-joint or something. Ok under load ... for now. Anybody with a recommendation as to where I can go to get it looked at. Not really in a position to work on it where I am staying during the week in the Grapevine. I work in downtown Dallas.
Thanks in advance!

Its not the "clunk," is more of a repetitive banging sound under light load, and turning corners.

Also, another thought, I changed the diff fluid about a week or so ago for the "clunk." I used the heavier weight Lucas that says no additional friction modifier needed. Could it be that I just need to go back and add some of the GM friction modifier? Thinking about the simple things first.
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Last edited by WadeTXGTO; 01-28-2013 at 07:16 AM. Reason: more info
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Old 01-28-2013, 06:38 AM   #2
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i would tell you to come by my house but i am way out in the opposite direction from you.
there is one guy who works in Dallas at a shop and i hope he chimes in because i'm not going to volunteer his services for him. i also know that there quite a few who live in your area so maybe they'll chime in too.
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Old 01-28-2013, 07:50 AM   #3
atx63bravo
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Quote:
Originally Posted by WadeTXGTO...View Post
I am in the process of relocating to Dallas, driving back and forth to Austin on weekends. Driving into work today, it sounds like I have something really loose in the driveline, like a worn u-joint or something. Ok under load ... for now. Anybody with a recommendation as to where I can go to get it looked at. Not really in a position to work on it where I am staying during the week in the Grapevine. I work in downtown Dallas.
Thanks in advance!

Its not the "clunk," is more of a repetitive banging sound under light load, and turning corners.

Also, another thought, I changed the diff fluid about a week or so ago for the "clunk." I used the heavier weight Lucas that says no additional friction modifier needed. Could it be that I just need to go back and add some of the GM friction modifier? Thinking about the simple things first.

I think I would pull out the Lucas and go with Torco and the proper friction modifier. I use it in my GTO and I have had ZERO issues with it. Does the sound sound like it is coming from the ass end of the car?
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Old 01-28-2013, 08:02 AM   #4
WadeTXGTO
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Yes, definitely from the rear. And more noticeable around corners.
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Old 01-28-2013, 08:21 AM   #5
sergo
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you can try adding some f/m. may or may not help at this point but since you didn't put any in it's worth a shot.
use the ford (xl3) stuff.
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Old 01-28-2013, 08:32 AM   #6
atx63bravo
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Yeah man I am no super GTO mechanic, but from what I have seen here your symptoms look like something to possibly do with no friction modifier. I would go with Sergos recommendation with adding the f/m and if that doesn't fix it I would personally drain it all back out and go with Torco.
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Old 01-28-2013, 09:37 AM   #7
WadeTXGTO
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Sounds good. I'll try that this evening. Not sure the Torco is available locally, but I'll pick up something to drain & refill with the friction modifier this evening.
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Old 01-28-2013, 10:28 AM   #8
atx63bravo
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Try uprev on lamar. I was there the other day when a friend of mine was getting his car tuned there, and I noticed that they had a Torco display there. They may have it, but I am not sure as I did not look closely at it.
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Old 01-28-2013, 10:44 AM   #9
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While your down there, check the TQ on the stub bolts. I had mine come loose before.
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Old 01-28-2013, 12:55 PM   #10
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might call Mike at Whitesidecustoms. His shop is by Lewisville, not to far from Grapevine up 121.
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Old 01-28-2013, 08:01 PM   #11
WadeTXGTO
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Thanks guys. Well i am probably the only one who didnt know this on the board, but i learned you need to add the friction modifier even if the gear oil says its not necessary. Drained, refilled with new gear oil and some of the transx tonight -- all better. It was howling and knocking, now its just fine.
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