blk99camaro

iTrader: (9)

Backlash is .08, .017 shim on the pinion. Where should I go from here? Losing patience. I just want them to be QUIET. They are U.S. Strange 4.10s.
any help/advice is greatly appreciated.

Jon

01ssreda4

iTrader: (96)

The pinion shim spaces it away from the ring gear right (on a 9 inch)? Add some shim to get the gears to move apart. You can tell bc of the hard line at the bottom of the tooth on the second pic. They are meshing too far into each other.

01ssreda4

iTrader: (96)

I would try a 20-22 and see how the pattern looks, you arent far, dont get discouraged. PM for faster response if you have specific questions.

blk99camaro

iTrader: (9)

01ssreda4

iTrader: (96)

That looks a ton better

01ssreda4

iTrader: (96)

I think i would take it out a smidge more and see if that coast will center up

Joe nic

Your right it does look better but it kinda looks like the depth is starting to come up a bit high on the face and putting a thicker shim in there will move it even higher on the face I would try to move the pinion in deeper to get the pattern back down deeper towards the flank of the tooth and then increase the backlash to keep the pattern kind of in the center between the toe & the heel.

blk99camaro

iTrader: (9)

I didn't go with the pattern posted, and I guess I deleted the pics of what I went with. Break in miles are done and its good and quiet. Time to change the fluid and let it EAT!

01ssreda4

iTrader: (96)

Good deal........

Joe nic

It' opposite to what you would think. To move the pattern deeper or shallower into the valley of the tooth you move the pinion. To move it up or down from heel to toe ( like you need to ) you move the ring gear sideways with the threaded adj rings. Yours is bad. I just did one with a pattern exactly like yours on a 10blt. ( all diffs take the same adjustments to move the pattern ) I moved the ring gear away from the pinion .015 and the pattern was great and the noise went away. Sometimes it gets tricky when you have such a sharp edge on your pattern but just go with increasing your backlash like i said and see what happens. Don't get to concerned about going over 10 or 12 thow back lash. I've had to go 15 even 20 thow on some used gear sets to get the pattern right. Thats the important part, the pattern. Bottom line, doesn't matter the final measurements if the pattern is correct. Is your gear set used? How many miles were put on it while it was making noise? It could develop a bad ware spot on the tooth ( bad pattern worn right into tooth surface ) that you cant get rid of. If to many miles were put on it it might make noise forever. ( fingers crossed) do the teeth have a burr on the bottom edge from one gear running onto the edge of the other. That's not good but might be ok. Try the adjustment and do another pattern check and we'll go from there

Joe nic

you need more backlash, not less pinion depth

01ssreda4

iTrader: (96)

If you say so. Ive never setup a set that was 15-20 backlash, that's ridiculous and too sloppy for my tastes.

Joe nic

haha, ya me two, of course you would never intentionally set a diff up with that much back lash...... if you can help it. I was just referring to the extremes I've had to deal with when working on some used crap thats already been howling. I' sorry if I've offended anyone. I was worried about anyone thinking I was stepping on someone's territory. I really was just trying to help. I actually do have alot of experience. I've been a licensed mechanic for about 35 yrs and have done probably 100s of diffs with great success. I'm new here so maybe I'll just hang back and watch for awhile. Once again sorry about that

01ssreda4

iTrader: (96)

I try to never use or setup used gears, so my experience there is limited. Ive had plenty of offers to do gear swaps and if they wont bring me new gears, I simply wont do the job for them and tell them to walk. I dont want the headache.

erickk120

Do you prefer 5 or 2 cut? I think working with a 6-10 bl is way more sane than trying to keep a 3-6.

01ssreda4

iTrader: (96)

I haven't kept up with who makes what cut. I've had good luck with motives. The blue box gears are great for the new guy trying to setup a quiet rearend.

2QWK4RU 06 GOAT

iTrader: (1)

Agreed. That's bogus and gonna be a slop monster. Even used gear installs are not set that loose.

2QWK4RU 06 GOAT

iTrader: (1)

Used gear Install can be tricky. It's an art for sure. It took me lots of training and practice to get it right. You definitely have it easier with new as you said.

RockinWs6

Anything over .008 will be sloppy and cause a nice CLANK when engaging into gear. When using used gears I've found using a heavier gear oil helps lower the whine and if its a 10bolt in a Camaro-Firebird you're going to experience some whine from 40-70 mph no matter what you do. Setting the backlash at .015 is crazy in my book. I worked on a TA that the dealer setup @.012 and it was terrible, noisy loose sloppy.

01ssreda4

iTrader: (96)

Add in a body mounted torque arm and you feel and hear everything inside the rearend.