My 1996 Bonnie shudders in OD. Its most noticeable when doing 70mph up hill somewhere around 2200rpm and 2300rpm. It is more prevalent when its warm out (70F). If I give it more gas it downshifts and it goes away, if I put the car in regular D it dosent do it at all. I also get the same shudder at different speeds usually low RPMS up hill when the car is in OD.

Could it be a misfire? The trans works perfectly in every other gear.

Transmission fluid is nice and pink.
Reving the car in neutral produces no evidence of a misfire.
There is a CEL, but plugging my obdII scanner in does not work. My scanner dosent receive any power. Result of an alarm that has since moved on?

I stumbled across this thread which meantions OD issues.
viewtopic.php?f=48&t=1683

I got the readings from the secondary coils

6.7
6.15
6.10

There is a difference between the top and the bottom two coils, but is it enough to worry about? The primary coils I cant seem to get a solid reading on any of them, not sure if I'm getting a good connection. Going to try again when the sun returns.

Those coil numbers look fine to me.

Your symptoms, to me, sound more like bad torque convertor lockup clutch action.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

I have three sets & none of them vary that much.
Set #1 > 5.70, 5.73, 5.78 - These 3 are from an L67.
Set #2 > 5.81, 5.84, 5.86
Set #3 > 5.87, 5.84, 5.91

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2006 Chevy Monte Carlo SS

Lets say it is the torque converter. What are my options? Is it a common problem? Is one year better than another? Is it going to require a wheel barrow full of cash?

I have no problem dropping the trans myself.

If you can drop the trans yourself, a remanufactured Torque Converter is $300-$400, IIRC.

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Bye Bye:

RIP sandrock

I'm a little hazy on the details, but I think the convertor clutch can be serviced without replacing the convertor itself. I'm not sure how to exactly diagnose it either.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

I have the very same symptoms on my 95 SSEI. I doubt the problem stems from the transmission as I just had my transmission overhauled. I took insurance through Progressive and they put out a list of tech bulletins on your vehicle posted by GM. There is one dated Sept, 2005, NHTSA number 10017568 concerning these symptoms and you can probably find out through a Pontiac service department what the bulletin contains. Good luck

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Hello to all from the sunny southwest. I am not a new member, just that I fouled up editing my profile, (not being a computer wiz). That being the case I'm saying hello again, so there! P.S. I was just flyer, now I'm old flyer.

I stopped at a Pontiac dealer service department and gave the manager the Tech bulletin #'s and the fix according to GM is replace the Throttle Position Sensor

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Hello to all from the sunny southwest. I am not a new member, just that I fouled up editing my profile, (not being a computer wiz). That being the case I'm saying hello again, so there! P.S. I was just flyer, now I'm old flyer.

Pontiac dealer? I thought GM dropped the Pontiac line?

To rench jeep: We are not talking about when GM dropped Pontiac. We are trying to solve this guys problem. If you read my response carefully you will see the tech bulletin was dated 2005. However GM Pontiac dealers still have archives on technical matters on any of their products including discontinued lines for at least 10 years

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Hello to all from the sunny southwest. I am not a new member, just that I fouled up editing my profile, (not being a computer wiz). That being the case I'm saying hello again, so there! P.S. I was just flyer, now I'm old flyer.

Right you are, old flyer. Sorry. I do miss the old Pontiac sign at the dealer, though!

As an aside, I had a shudder under same conditions in OD with my wife's 99 Crown Victoria at about 130k. I dropped the trans pan, drained the TQ (not possible with our trannies?), replaced the filter, refilled with fresh fluid and a product called Dr Tranny Instant Shudder Fix. Well, it worked for me.

I am not one to go for "snake oils" like this, but I did not want to rebuild the trans or replace the TQ if I didn't have to. So far, so good! 2 years and 20k later, shudder is still gone! Now has 149k miles. Time for another tranny service. I will do the same again.

Check eBay item 120390737459.


I am in no way affiliated with eBay, Lube-Gard, or Dr Tranny. Apart from using the products!

Please let us know what you find. Maybe this can help others?

Does your tranny have symptoms like this>>> http://www.pontiacbonnevilleclub.com/forum/viewtopic.php?f=23&t=12868&p=136395#p136395
This grand prix now has over 8,000 miles on it since the repair and still working perfectly.