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Author Topic:   Convertor going bad?
kid vishus
Gearhead

Posts: 5550
From: middle of NC
Registered: Oct 2000

posted 06-14-2004 06:09 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The problem is with my Lightning. It's a '93 (and from what I've heard, the 93's had the weakest trans of the bunch), it has 194k miles on the motor/trans and neither have ever been out. Th problem is this, when under a load, when the motor reaches right around 4k rpm in each gear, it develops a distinct vibration. It doesn't do it when sitting still and free reving it. It is not speed sensitive, only rpm. Also, when I pull one of the racecars, when I first take off, it has a very notice-able 'shudder' in second gear that gets worse with rpm. Once the motor/trans gets good and warmed up, the shudder goes away.

What does everyone think? I'm afraid the convertor may finally be failing.

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SteveLaRiviere
Administrator

Posts: 38747
From: Saco, Maine
Registered: May 99

posted 06-14-2004 06:31 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I'm no trans expert, but that sure sounds like a lockup convertor going south. Maybe you could try a fluid and filter change? I've seen it perform miracles.

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'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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kid vishus
Gearhead

Posts: 5550
From: middle of NC
Registered: Oct 2000

posted 06-14-2004 07:44 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I was afraid of that.

I normally change the trans fluid once a year in hopes of preventing any trans failures. Looks like it might be time to give that a shot again.

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SteveLaRiviere
Administrator

Posts: 38747
From: Saco, Maine
Registered: May 99

posted 06-14-2004 07:52 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
If I could ever get this GD CD drive to work, I could look up a troubleshooting tree in my CD shop manual!

------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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ccode67
Gearhead

Posts: 2049
From: douglasville,ga,usa
Registered: Mar 2001

posted 06-15-2004 10:44 AM     Click Here to See the Profile for ccode67   Click Here to Email ccode67     Edit/Delete Message   Reply w/Quote
My '91 was doing the shutter thing, there was some additive that helped but didn't fix completely, sorry I can't remember who made it but it came from a transmission shop. I almost want to say it was a mopar product. Won't help with the converter.
That truck still has that shutter sometimes, did it when new and now at 165,000. I sold it to a friend for his son's first vehicle, they lowered it and put Lightning wheels on it, I relly miss that one.

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68Rustang
Journeyman

Posts: 50
From: Galesville, Maryland
Registered: Feb 2004

posted 06-22-2004 02:08 PM     Click Here to See the Profile for 68Rustang   Click Here to Email 68Rustang     Edit/Delete Message   Reply w/Quote
That fluid you are thinking of is friction modifier, the best kind to get is REDLINE or FOMOCO. Yes I work on cars. Koons Ford of Annapolis.

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