i have a 99 trans am m6. torquer v3 cam tsp 1 7/8 headers ory 3.73 gears k&n air filter.

for the past month or so i have been experiencing a bucking issue at around 1500 rpms. seems to do it in every gear, most noticable in 5th-6th gear. it is very annoying, the car did this once before and i go underneath and it was the torque arm bolts loose. so i tightened them back up and it went away, now i got back under it thinking they were loose again and they are still tight. i did notice there is a little bit of slack in the diff. i can get a hold of the yoke on the pinon and it does have a small amount of slack in it. it has not always done this, the differential was completely rebuilt about 20k miles ago, new auburn carrier and 3.73 gears. the cam was installed about 10k miles ago, and has been fine up until the last month or so. i usually dont even drive the car but my DD tore up so ive been driving it to work and this is when i noticed it.

any help would be appreciated.

 

here s avideo of the slack in the diff.

 

I have the same cam. Bucking was worse until I got a full street tune over the mail order tune. Now it's a lot better, but still there. I would imagine the tune needs some work. You might have better luck with answers in a different sub forum - Tuning/Diagnostics, Gen 3 Internal Engine.