Hi first off i wanna say this site is great, lots of good info! Now i have a problem and im hoping someone can help me come up with some ideas. My car has about 75,000 miles on it M/T, the outer boots just recently split open and so i changed both, i actually had a local shop do it at the same time they aligned it, after they were done no more popping and the car drove straight! Awesome! the only problem is now im hearing this kinda of like vibration/grinding when my motor is at 3200 RPMs in any gear. Im totally stumped, im gonna take the brakes off tomorrow and check them because they are squeaking but i know this other noise has to do with my engine/tranny, its only at about 3200 rpms in every gear, all other rpms=no noise. Has anyone experienced this or have any ideas. For one im going to change the tranny fluid to Amsoil 75-90 GL4. When they changed the axles i think they changed the fluid and ive never changed it, i bought the car with 39k. Any ideas would be much appreciated. Im pretty mechanically inclined especially with old chevy stuff but new to the 4 cyl and man tranny. im thinking old fluid finally being changed messed with something or maybe a bearing. Funny thing is i hit the break while still accelerating at about 3200 rpms the sound/vibration goes away. It cant be on the outer of the tranny though because that would be a certain speed not a certain rpm. Thanks for the help.