powerglide buzz/vibration

[probird]

Hi Fedders!
I have a fed with a mild 355. low 9's.
now i went through the trans at the beginning of the year and changed converters as i thought it might be that but it still makes a bad vibration/buzz in neutral and park. if i put it in low/drive it goes away. its a jw case, shorty, etc. doing some research online and could it maybe be the planetaries vibrating as it freewheels?
Ideas on what to look for?
Thanks.

[bikeguy307]

The planetary carrier only move when the car is moving. Now when in park and neutral the input does rotate, as well as the high drum causing the ring gear to also rotate. So I would look to see if any of the gears are loose on the pins. Onced dropped in gear all the parts stop moving.

[probird]

Ok. i will look at that when i get it apart. Thanks.

[bikeguy307]

Please up date us on your findings, knowledge is power.

[probird]

update!
I had one of the best powerglide fellows around have a look inside the trans last week. All he could see was the spring for the parking pawl was broken on the end which rests against the case. it was sticking in the case rubbing on the drum. in neutral and park, the drum rotates until either the band or clutches engage to hold it in place. That made a buzzing sound/vibration as it was scraping against the drum.
Once i get it back in and able to test, ill get back and report. hopefully that was the problem.
cross fingers and toes..... minor issue!
Barry.

[bikeguy307]

Hope that fixes it. Let us know.