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Discussion Starter #1
Hi, I'm new to the forums here and was hoping to get some opinions from those with more experience. I recently installed a set of FRPP 410 gears with all new bearings.

The original pinion had a .026 shim. My new pinion was about .002 larger than my old so it was close. However, my new motive bearing kit had a pinion bearing which was a little over .020 thicker than the old so obviously this means I would be using a smaller shim. It turned out I have ended up with NO shim at all to even get the gear pattern close. I tried shims of all thicknesses and the pattern was worse.

Right now I have a backlash of .008 and my shim thickness for the carrier match those of the stock shims (was able to use one stock shim).

My pinion has been torqued (new crush washer) to 18 in. lbs. I was told 16-28 was the range for new bearings.

The gear pattern you see in the pictures below is what I ended up with. Sorry the picture quality sucks but hopefully you can get the idea.

The drive side of the teeth looks great. The pattern is centered from heel to toe and face to flank. However, the pattern on the coast side of the teeth ended up more to the heel. I don't think the pattern runs off the edge of the teeth, it's just layed most of the pattern to the outside but it is centered from face to flank.
 

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.008 is fine i stand around and get drunk at the best gear shop in az, so I know my ****
 

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Discussion Starter #5
Thanks for the responses. I can say this, this mod has been one major PITA. It was much more difficult than I had expected it to be. Tightening the crush washer took three of us to do. I had to use a pry bar, an 18" breaker bar with a 3 foot cheater pipe attached to it.

It has been a learning experience and likely something I'll never do again :D

I'd rather rebuild an engine any day. I mainly did this because it was the first mod recommended by so many people for anyone looking for good accelleration.

I hope the step up from 308 to 410 gives me a good pull when taking off.
 

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Discussion Starter #8
I took the car for a test drive this morning but only for a few blocks and was only driving for maybe 7-10 mins.

I DO have a Gear WHINE with these 410's. Is this normal? I've heard some say it is normal but some say they don't have any whine.

I didn't hear any popping sounds like teeth chipping or clutch discs (I rebuilt the trac-loc as well). Only thing different was the gear whine which starts at 30mph and up and is loud enough to hear inside the car on a rainy day.

I didn't do any hard take off since it was just a test so I can't comment on the performance feeling of it, but I did notice that even at a slow getle take off I was getting into the powerband faster and was staying in 3rd gear more when I would have normally been in 2nd.

If this is not normal what do you suppose is the problem? Backlash? If possible I would like to get rid of the gear whine.
 

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Discussion Starter #9
I was just curious if others had this problem and what they found to be the problem. I figure it was something I did or didn't do, not the gears.

I may tear into this again and recheck my pinion preload to make sure it still shows 18 inch lbs on the pinion nut.

I may also adjust my carrier backlash. It was left at .010 in the end but FORD recommends 12-15 so I'm curious if that will quiet them down some. Right now they are fairly loud. At 30+ mph they sound like there is no oil in between the ring and pinion but it has almost 3 bottles of gear oil which has the limited slip in it. Plus I drove it for a few mins and if it didn't have oil I would have damaged them for sure.

Any thoughts, particularly from past experience, would be helpful.
 

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Are they richmond gears? If yes, then be happy they don't whine louder. It seems that once you go past 3.73s, it typical to start picking up a little whine, and the more gear you get, the more likely it is to make some noise. That said, I have ridden in a few cars with 4.10s that didn't make much noise, but it seems like more make noise, than not.
 

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Discussion Starter #11
Are they richmond gears? If yes, then be happy they don't whine louder. It seems that once you go past 3.73s, it typical to start picking up a little whine, and the more gear you get, the more likely it is to make some noise. That said, I have ridden in a few cars with 4.10s that didn't make much noise, but it seems like more make noise, than not.
They are FRPP 410 gears. I am not too concerned about a little whine, but once I get up around 30 mph and higher the whine becomes loud enough to hear over everything. It's a little too loud for comfort. If my exhaust doesn't drown it out, it's too loud :) I was curious which was more likely to create whine, backlash that was too tight or too loose. I was thinking tight backlash might create more.
 

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Are they richmond gears? If yes, then be happy they don't whine louder. It seems that once you go past 3.73s, it typical to start picking up a little whine, and the more gear you get, the more likely it is to make some noise. That said, I have ridden in a few cars with 4.10s that didn't make much noise, but it seems like more make noise, than not.
im glad i read this. ive got richmond 3.55's and it is exremely loud. thinking about swapping to 3.73 anyways
 

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if theyre new and installed right there shouldnt be any whine, my used 4.30s have zero whine, 4.10s and 2 sets of 3.73s had no whine either
 

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it only does it when im cruising at about 2k rpm in 3rd or 4th. but its loud. lol
 

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Discussion Starter #16
I found the problem, but I've yet to test again. I got the car back on jack stands and pulled the carrier out. The pinion had loosened up.

I torqued it down with a 3 foot cheater pipe until it had 18 in. lbs drag on it. Somehow it loosened up and when I rechecked it there was almost no drag on it.

When I finally tightened it down again and rechecked my wear pattern it was horrible, a nightmare. I ended up back at the machine shop getting the orignal shim I had in the first place, a .027 lol

With the .027 shim on it I rechecked the pattern and it was almost perfect on both sides.

I went ahead and torqued the pinion down AGAIN with a new crush washer and pinion nut and set my backlash to .008 and rechecked the pattern one last time to make sure. The last test showed a good wear pattern still so I went ahead and went with it. I have it filled up with oil again and ready for a test drive in the morning.

Hopefully I'll have better luck this time. I don't mind a little whine at higher speeds but no way I'll accept what I heard the last time. Maybe all will go well and there will be no noise this time.

The pinion shouldn't loosen up again this time because after it was tightened down again I spun the crap out of the flange and lightly tapped it with a rubber mallet just to make sure it wasn't going to work loose again. After constant checking for probably 15 mins it remained the same at a constant 22 in. lbs.
 
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