99 Trans Am Shaking in Overdrive
Thread Starter
Staging Lane
Joined: Apr 2014
Posts: 56
Likes: 1
99 Trans Am Shaking in Overdrive I apologize if this is not the correct forum, but I did not see a total drive line forum.
So, picked up my car from the shop today after they shimmed the torque converter for me. It is a PTC 3500 stall. I drove it for around 500 miles with the flex to converter clearance at 1/4". Seemed to not have any problems except for a faint vibration in 4th gear. They added shims to bring spacing between 1/8 and 3/16 which is what you want or so I hear.
When I got it out on the road, it felt like the whole car had a nasty shake only in 4th gear (which is when the converter locks up). The shake gets worse when you hold the throttle open but not allow it to shift out of 4th.
I felt a faint vibration before the shimming work was done, but not a total shake like this.
My thoughts are yoke, drive shaft, pinion angle, trans/torque arm mount could be problems. But I can't look past the fact that it got worse after the shop did what it did.
Unfortunately, I have to drive home an hour, since I picked up from shop and went to celebrate Thanksgiving with family. There are no tools here to investigate the problem.
Does anyone have any ideas here? Wonder if I can make it home driving an hour? The car is lowered so it makes it extremely difficult to load on a car hauler if the problem explodes on the way home.
So, picked up my car from the shop today after they shimmed the torque converter for me. It is a PTC 3500 stall. I drove it for around 500 miles with the flex to converter clearance at 1/4". Seemed to not have any problems except for a faint vibration in 4th gear. They added shims to bring spacing between 1/8 and 3/16 which is what you want or so I hear.
When I got it out on the road, it felt like the whole car had a nasty shake only in 4th gear (which is when the converter locks up). The shake gets worse when you hold the throttle open but not allow it to shift out of 4th.
I felt a faint vibration before the shimming work was done, but not a total shake like this.
My thoughts are yoke, drive shaft, pinion angle, trans/torque arm mount could be problems. But I can't look past the fact that it got worse after the shop did what it did.
Unfortunately, I have to drive home an hour, since I picked up from shop and went to celebrate Thanksgiving with family. There are no tools here to investigate the problem.
Does anyone have any ideas here? Wonder if I can make it home driving an hour? The car is lowered so it makes it extremely difficult to load on a car hauler if the problem explodes on the way home.
TECH Fanatic
Joined: May 2016
Posts: 1,292
Likes: 436
From: St. Louis
Do you have a poly trans mount? If so put a softer stock one back in and see if the vibration goes away. I've found that the smoothest setup for A4 cars is good poly motor mounts and the softer oem style trans mount along with a poly tourqe arm bushing.
Check the driveline angles as well since your lowered. The lighter converter will not absorb as much vibration as the big heavy stock one and so that is likely why you are experiencing the vibration now and didn't notice it before the converter was installed.
Check the driveline angles as well since your lowered. The lighter converter will not absorb as much vibration as the big heavy stock one and so that is likely why you are experiencing the vibration now and didn't notice it before the converter was installed.
Thread Starter
Staging Lane
Joined: Apr 2014
Posts: 56
Likes: 1
Do you have a poly trans mount? If so put a softer stock one back in and see if the vibration goes away. I've found that the smoothest setup for A4 cars is good poly motor mounts and the softer oem style trans mount along with a poly tourqe arm bushing.
Check the driveline angles as well since your lowered. The lighter converter will not absorb as much vibration as the big heavy stock one and so that is likely why you are experiencing the vibration now and didn't notice it before the converter was installed.
Check the driveline angles as well since your lowered. The lighter converter will not absorb as much vibration as the big heavy stock one and so that is likely why you are experiencing the vibration now and didn't notice it before the converter was installed.
