904 loud whining in gear. Help!

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BsB Duster

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Hey guys I recently had my 904 rebuilt and had a custom convertor built for my combo. Everything seemed great until I put the car in gear and it makes the terrible noise that you hear. Does anyone have any ideas as to what it might be? I’m trying to figure out how to upload a video.https://youtube.com/shorts/VlreQmEgFCc?feature=share
 
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BsB Duster said:
Hey guys I recently had my 904 rebuilt and had a custom convertor built for my combo. Everything seemed great until I put the car in gear and it makes the terrible noise that you hear. Does anyone have any ideas as to what it might be? I’m trying to figure out how to upload a video.
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Did you fill the thing and put it in neutral when checking?
Sounds like it's got the pressure jacked up
 
BsB Duster said:
https://youtube.com/shorts/VlreQmEgFCc?feature=share
Click to expand...
Wil it go into gear?
A couple things come to mind
Did you hear/feel the torque converter go on all the way like two clunks?
And you should have had to pull it toward the engine slightly to bolt it to the flex plate.
Also could be the wrong spline converter
Just spinning around the input shaft.
That was why I asked if it will go into gear.
First two things I'd look into.
Hope you find it
 
check the paint on the convertor (inspection plate) and see if any has been scraped off by something dragging on it. Ring gear touching something by the starter?
 
Mopar69gts said:
Wil it go into gear?
A couple things come to mind
Did you hear/feel the torque converter go on all the way like two clunks?
And you should have had to pull it toward the engine slightly to bolt it to the flex plate.
Also could be the wrong spline converter
Just spinning around the input shaft.
That was why I asked if it will go into gear.
First two things I'd look into.
Hope you find it
Click to expand...
It does go into gear. The video is in gear. Everything sounds fine in neutral or park.
 
BsB Duster said:
It sounds just fine in neutral. Only does it when in forward and reverse gears.
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That's the pressure jacked up really high. You could ask him to adjust it lower.
I had my 518 rebuilt and told him I wanted a firmer first to second shift, he jacked up line psi and so my reverse makes a lil buzz noise and 1 st is a little noise..but it grabs second like no bodies business. He said it was built for holding power being it's a 4x4 truck.
Its not staving.
See how it drives 1st though.
 
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What type filter did you use? The felt type sometimes will not let enough fluid thru and will make hell of noise as trans is straining to pull fluid thru it. Though it is usually only in reverse. I had a brand new filter do that on a fresh rebuild. Find the hypo fine wire mesh type filter. I have a trans shop supply me with them.
 
Oh Idk..
Just thinking about what it could be.
I had my line pressure as high as 185 lbs
And it didn't make noise like that.
I had to keep lowering it down
1 turn at a time to get the shifts less harsh.
That's the only reason I knew the amount of adjustment.
Mine is at 145 now
It took 4 turns to get it there.
I'm sure more knowledgeable transmission people can help.
 
I never use felt or paper filters on HP Torqueflite builds. Always brass. They flow a lot more.
 
Transmission is pumping fluid out the cooler line when running, and I can see that the starter is disengaging. It sounds like it is in the middle or the back of the transmission.
 
It's not a filter design issue. Scrap that thinking.


I've never used a brass filter outside of race apps. Not that it matters.

Governor noise?
I say get it on the road, test drive.. to teams shop where you have him listen to it.
And he can advise and or fix the psi.
 
BsB Duster said:
Transmission is pumping fluid out the cooler line when running, and I can see that the starter is disengaging. It sounds like it is in the middle or the back of the transmission.
Click to expand...
Maybe the output shaft bearing?
 
two guesses;
as already mentioned is the convertor spline. and second is a planetary stripped out. That happened to me when I installed an A998 gearset on an A904 output shaft. Apparently you cannot do that because altho you can physically assemble them, the splines were mismatched, and I got about 15 miles from home when
zing zing,
sounded sorta like yours does.
In my case, I was walking.
 
Talked to my convertor guy this morning. He says it sounds like a cracked pump gear to him. He is also sending me another new convertor to rule that out. I am going to pull the pump and take a look at it. What should I be looking for to tell if it’s bad? Thanks
 
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