Jack it up and take a look!!!
Any Ideas What This Noise Is?
Driving it into driveline shop here. They said the u joints, carrier and rear end are fine and thats its the tranny.
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Sounds to me like rear end noise. Jack up both rear wheels or put on lift, disconnect drive shaft at rear end, spin rear wheels and listen. My thoughts are spider shaft broken, spider gear issues, or major ring and pinion gear issues. Bring it to another shop and avoid excessive driving because it will leave you on the side of the road. The shop you went to should not have let you drive it until they found the problem and give and estimate to fix it. Lets us know what happens.
It's definitely something before the differential. It's making the noise too fast to be differential because it's happening more than twice per tire revolution.
We had it up. The noise is coming from inside the tranny.Sounds to me like rear end noise. Jack up both rear wheels or put on lift, disconnect drive shaft at rear end, spin rear wheels and listen. My thoughts are spider shaft broken, spider gear issues, or major ring and pinion gear issues. Bring it to another shop and avoid excessive driving because it will leave you on the side of the road. The shop you went to should not have let you drive it until they found the problem and give and estimate to fix it. Lets us know what happens.
They said its coming from inside the tranny. Got it at the tranny shop now. I put it on my Bendpak and heard the noise coming from inside the tranny as well.It's definitely something before the differential. It's making the noise too fast to be differential because it's happening more than twice per tire revolution.
Is the Park Pawl not disengaging? Whatever it is, it is major! Unless it is the Park Pawl , which is not a big deal to fix.
Parking pawl is grabbing fine but that doesnt mean its not shot. Its being disassembled now. Im betting either something in the Torque converter or flex plate at this pointIs the Park Pawl not disengaging?
The frequency of the noise in your video is roughly once every revolution of the drive shaft and 3 times every revolution of the rear wheels. Torque converter or flexplate would be roughly once every crank shaft revolution. With engine idling at 600 RPM, that would be 600 noises per minute or 10 noises per second and it would make noise standing still idling in park. Did somebody stand on the throttle in neutral and drop it into gear and tear something up??
Not since Ive had her. She's a completely stock and original funeral coach that was owned by funeral affecionados in the past. Ive had her since 2014. This noise just popped up out of no where. Same thing happened to a friends '74 Superior. Once they rebuilt it the problem was gone.The frequency of the noise in your video is roughly once every revolution of the drive shaft and 3 times every revolution of the rear wheels. Torque converter or flexplate would be roughly once every crank shaft revolution. With engine idling at 600 RPM, that would be 600 noises per minute or 10 noises per second and it would make noise standing still idling in park. Did somebody stand on the throttle in neutral and drop it into gear and tear something up??
What's the verdict??
My guess is cracked input drum right where the input shaft presses in.
Still waiting.......once I find out I'll let you all know.What's the verdict??
Ive been studying the anatomy of the T400 and see what you're talking aboutMy guess is cracked input drum right where the input shaft presses in.
The trans had its own problems. Thrust bearing, clutches being just two. Now it works fine but that noise is still there. Convinced now its the differential as I ran into a video of that noise being made by a pinion and ring gear out of adjustment. On to the differential now and a different approach. I have a friend here who works on them. We got it on my lift now and are doing a thorough inspection of it
I contend it's impossible to be the differential. The differential spins at wheel speed, and when both wheels are traveling the same speed (like the second half of your video) the spider gears aren't even turning, yet the noise still exists. The driveshaft spins 2.41 or 2.73 times faster than the wheels. Since the noise is happening more than twice the speed of the wheels, it has to be pinion or forward.
Don't throw money at it. Put it on a frame lift and start it up and locate the noise.
My bet is broken spider shaft in the differential carrier. When the shaft breaks at the retaining bolt hole, the shaft works it's way out and hits the pinion gear and the inside of the rear end housing. It can make a hell of a noise and more than once every wheel revolution. Let us know.
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