Question about 1999 Oldsmobile Silhouette

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Transmission i have a 1999 olds silouette van the transmission acts as if it is being put in neutral when going down the road. If you are tryin to take off at a light the engine reves up and then in will take off real hard thanks for your time and knowledge

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Your vehicle has the 3.4 ltr engine and the 4T65E model transmission,which i have rebuilt many,many of.First,verify the transmission fluid level is FULL,and not low,also verify by pulling the pan,that the filter is in place.If all that checks out,then the problem is internal.For the problem you are describing,there are two areas to address.The first,which can be checked outside the trans with a 0-300 psi gauge is the EPC solenoid.EPC stands for Electronic Pressure Control.It is an electrically controlled solenoid that regulates mainline pressure inside the trans.The OEM (original equipment manufacturer) solenoid is known to be problematic,and erratic,causing your vehicle's symptoms of neutralling out,and slamming back into gear.The other area is the Forward piston inside the Forward/3rd gear input drum.The steel piston gets a ridge worn into it,and when it tries to apply at a stop light upon taking off,the ridge causes the piston to hang up momentarily,and then when it frees up,again,a neutral/slam into gear.Common problem that i have had to address over and over on these transmissions.Good luck.

Posted on Jul 19, 2008


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