99 Mustang V6 Auto transmission problem with overdrive - Ford Mustang Forum
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post #1 of 4 (permalink) Old 01-19-2011 Thread Starter
punisher2185's Avatar
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Location: Orlando
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99 Mustang V6 Auto transmission problem with overdrive

Hi all, long time viewer first time poster. Thanks for any help I get and for the info I have already found on here over the years.

I have a problem with my automatic transmissions overdrive. When I have the pedal down to pick up speed it will shift extremely hard into overdrive. To the point where the whole car shacks/shudders (kinda similar to driving over those speed bumps that are really small but there are 5 of them in a row) Now it wont do it when I let off the gas a tad when I know it is about to shift into overdrive. I have driven the car for many years with it doing it. I just have been watching when I is about to do it and just release the gas a bit. I have done numerous searches on here about it and the only things I could come up with are either the overdrive band, overdrive servo, or the MLP. Do any of you guys think or know it is one of those or is it something entirely else? Thanks for any help.

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post #2 of 4 (permalink) Old 01-19-2011
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Location: Dumont
Posts: 6,168
welcome .. I'm no expert at transmissions but these guys who wrote this article seem to be.. i gave it a quick look.. have a look at this page of common problems and see if it isnt torque converter shudder

TCCoA Transmission Article - Page 4

2003 3.8L V6 4R70W
Windstar Upper Intake with cool-air intake, MAC LT headers, BBK O/R H-pipe, and flow 40s, SCT tuner, FRPP Alum. D/S, 3.73 gears, Auburn HP limited slip, and Team Z LCAs, Eibach sway bars.
Best 1/4 time: 15.036 @90.92mph, 2.148 60'
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post #3 of 4 (permalink) Old 01-19-2011
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Location: Nanticoke
Posts: 1,546
+1 on the article that Mark posted -- it's a great read!!

It might be one of the things you listed, or it could be as simple as just low fluid or a clogged filter (which make you slowly lose gears from high to low = overdrive/4th, 3rd, 2nd, 1st). What condition is your fluid? It should be full (but not overfilled!) and red.

FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver
POWER: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage)
STYLE: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs
RIMS: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear
TIRES: BFG KDW/2 245/40R18 front, 275/35R18 rear
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post #4 of 4 (permalink) Old 01-24-2011 Thread Starter
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Joined: Jan 2011
Location: Orlando
Posts: 2
Thanks for the info you guys. After reading that, I looked up more info on the "shudder" and I now do believe it is what you say with the torque converter. I've read some people just needed to change their transmission fluid and filter and it solved the problem. So I will be doing that here shortly. Just my luck as well, like I said I have driven with it doing this for years, and now that I have actually tried to make it happen after trying to finally figure out what it is and get it fixed it stops doing it lol. Anyways thanks for the info.
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