Question about 2001 Pontiac Bonneville

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Rough shifting When accellarating my car is shifting rough in the lower gears between 20-40 mph

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  • shane_meyer Jun 29, 2008

    the service engine soon light is also no

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Get a scanner pass to find code let me know cheers pierre

Posted on Jun 29, 2008

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Jeep cherokee jerks when shift into overdrive going 45 mph


If the engine has a rough idle you know you have a miss-fire or other problem with one or more cylinders.
When you shift into overdrive the engine is working harder than in normal drive because of the lower torque/RPM.
So any slight miss under normal conditions will be magnified in overdrive or with the ac on.
See if you can nail down the cause for the rough idle.

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1999 3500 dodge 4x4 dually, 47re Tranny. problem existed before and after having my Tranny rebuilt. tried 4 new valve bodies even a new BD VALVE BODY. Truck starts out in 2nd gear when put into...


the transmittion keeps shifting in & out of gear between 45 & 50 mph it shifts to a higher gear then a lower then higher then lower till I get above 50 mph whats the problem & how to fix it

May 03, 2011 | 1999 Dodge Ram

1 Answer

Hang up in third gear loss of power


Hi All

I have a s40 1.9d / 2000 plate,
In the last month or so the car loses revs when changing up to 3rd and 4th gear, I can only get 50 mph max in 3rd gear 80mp in 4th.
The car has just clocked 185,000 miles
Its a great car but a pai at the moment, I've had a service including fuel fillter change added fuel cleaners to the deilsel all to no avail


Any suggestions

Jul 06, 2009 | 2000 Volvo S40

1 Answer

Overdrive factors


When the car is just cruising along at approx.50+ MPH push the O/D button. You should feel the gears change higher and if you have an RPM guage then it should drop as well to fewer RPMs. This would be normal driving conditions. O/D will not kick in until the last regular gear (3rd or 4th depending on model)  had been shifted into. O/D automatically kicks out when slowing down and the transmission shifts to a lower gear. Thus the O/D has no function at slower speeds/gears and does not need to be shifted ( on or off ) except in the very first example given here.

Feb 26, 2009 | 1993 Toyota Corolla

2 Answers

Stick shift # Automatic RPM


That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

Jan 07, 2009 | 2002 Nissan Altima

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