First let me begin by saying I am new to the forum and if I ask a question that is already been discussed, I apologize.
I searched around in this thread and did not find any posts that relate to the issue I am seeing so again I am sorry if this topic has already been covered... I simply have not found it if it has been covered.
Anyway, I am working on a 1997 Pontiac Grand Prix GTP for a female friend of mine and have made a number of repairs to the car trying to get it road worthy for her.
Wheel bearing on the front left, Strut bushings both rear struts, Tie rod ends, Alternator, battery, supercharger coupling...just to name a few.
The problem I now find is that if you drive the car with a "easy foot" all is well.
However, if you accelerate from a dead stop with any great deal of throttle the transmission seems to "chatter" or hammer really hard.
This only happens while it in automatic first gear acellerating.
It's almost as if the clutch pack is slipping and then grabbing and slipping and grabbing.... only very harshly.
I have found that if I put the transmission in 1st gear manually I can accelerate with full throttle and this chattering event does not occur.
The chattering, or hammering as I prefer to call it, only occurs when taking off from a stop and the car is in drive.
Due to the fact that it only happens in drive and not in manual first gear I wonder if there is an issue with lower than required fluid pressure and if there is a way to adjust the line pressure.
Any help would be greatly appreciated.
If someone does reply and they would like to email me directly, you can email me at kbenoit204@comcast.net
Thanks,
Ken
