So heres the deal I had the rearend built buy a shop 2 years ago all new axles gears spool. 4.56 gears moser axles spool ect.. I have not been able to get it out on the road till jus recently.


While accelerating no noise at all. Letting off the gas and slowing down I hear a whine in the rear end kinda roaring. I called the shop he swears everything was right the pinion depth all that. He said its supposed to make that sounds while slowing down. Im not buying it one bit I spent alot of money on this rear end and I dont want it to break.


What do you guys suggest is the problem and what should I do. I honestly dont buy the its supposed to do that. Correct me if im wrong.




Thanks.

 

No, it's not suppose to do that.


There are a few things that it could be. First is the gear. I have installed several gears from several different makers that made some noise no matter how I set the pinion depth and backlash. Sometimes they just do that, even though they are not suppose to. I've had to return several gears for replacements to get the noise to go away.


Second, the pinion depth or backlash may be set wrong. Some people just don't know how to read the contact pattern. I've seen several gears that were set up by someone who said that they got it right, but when I saw the pattern it was not even close. Reading the pattern takes practice and you must know what you are looking at.


Third, the bearing preload might not be set right. Some people don't have a preload gauge and just don't understand how tight the bearings must be. I've seen several pinion bearings that were just too loose. This allows the pinion to move around under forward and reverse loads. Under a forward load the pinion is pushed toward the front of the housing loading the inner bearing. This puts the pinion where it is suppose to be. Under reverse load the pinion is pulled into the housing against the outer bearing. If the pinion is loose then the pinion will move into the ring gear out of place and many times it will contact the differential case.


All I can say is that you can either live with it or take it somewhere else and have it inspected. Someone needs to check the bearing preload and contact pattern. If it is set up correctly then the gear is at fault.

 

The thing is I can live with it if its right and supposed to do it but its it not then I want it set up right im going to have it inspected for a second opinion ty so much least I know what could be the problem.


He jus kept saying that with this gear your going to hear that noise while slowing down and acceelarating absolutely no noise at full throttle or ne at mid throttle.

 

What brand and type of gear is it? Is it a Richmond pro gear?

 

Yes sir its all Richmond the gears and rebuild kit.




thank you for trying to help me.




The guy jus called me he was aking how much I drove it so far I said maybe 1 mile. He said the gears have not seated yet the noise should settle down. =\
Said the gears are so low when I let off the gas its like when u dwn shift a manual trans are a high rpm it will make that noise till it gets seated and it will calm down.


The bad thing is it was built by a rear end driveshaft shop in Huntsville. They do a lot of work for the racers at Huntsville drag

 

Richmonds make more noise than any other (in my experience)

 

what should the bearing preload be with a inch pd. tq wrench. From wat I have read it should be 19-21. I had to remove the trans to install a converter last weekend. I notice with that you could grab the drive shaft and spin the rear with 1 hand. Wasn't super lose but I doubt it was 19-21. Would this cause ne noise the noise wont bother me if I know its right.

 

The pinion is surprisingly tight when the preload is set correctly. It will not spin free at all. It requires some pressure to turn at all times. Much more pressure that you expect if you are not use to setting them up. If it's pretty free then it's probably not set right.


To measure the preload you would have to partially disassemble the rear end. You would measure the pinion bearing preload first, and it should be around 17 to 19 inch pounds on the 7.5 rear end. The differential bearing preload is not measurable by rotating it, but should be tight enough that the differential can not be pulled out by hand.

 

Thank you big gear head ur the bomb gonna finish up some things then im gonna pull the rear end and have it done by someone else this guy seems more like a tard the more I talk to him he said it should be set to 12-14 pounds it should spin some what freely. I am done with him.

 

I had a set of Richmond gears I bought for my car and they made enough noise that I thought I had wore out my bearings again. i made the shop pull them apart and check everything and all was good. Reassembled and still made the noise. I wound up going with a set from Motive and all is well.

 

Totally agree. I have heard this from many many people. My richmond gears are loud too. only when i let off.

 

Ive been told by many mechanics that Richmond gears are loud too.My car does the same thing. When/if you pull it and have it checked out, respond as to if it was loud gears or something not set right. I dont think you need to pull it... think you can unhook shocks and other stuff and let it down with jack so you can get inside her...

 

I had trailered it to a different shop the guy I let work on my trucks he looked at it everything seemed fine had a good pattern. Even he said only 15 pounds preload on bearing the other guy had 15. He said same as the other guy to much preload doesn't allow the fluid to get around the bearing good. I don't know he said it was fine. Ill sleep a little better I guess. Richmond gear are deffinatly loud as hell but only when ur not accelerating. Like I said I can live with it as long as it is right.