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Discussion in 'Transmission & Driveline Topics' started by 71RS6SPD, Oct 7, 2017.
Blue is hard to read
It is centered top to bottom.. Face to Flank. Clear untouched areas above and below contact area. My research shows that's the main goal. That is what's effected by pinion depth. If I change the pinion depth - it will move up or down = bad. reference: https://www.ringpinion.com/Content/Book/Reading-and-Adjusting-Ring-and-Pinion-Tooth-Patterns.pdf. I am thinking that this pattern shows pinion depth is right on - i.e centered.
I took it apart today. The issue may be low or no preload on the carrier. Should not the unit be tight in the bearings? It slides out easy and can bee assembled without having to tap aby shims in place. All I have been watching says it should be tight and require it to be tapped in. I am going to try and figure out what side to add a shim to - maybe both. Ordering a shim kit today. Pinion bearings feel good and axle splines are mint. I will pull the pinion as I have a new ch moly yoke to install. I ordered an inch-pound torque wrench to measure pinion preload. and will get a new nut and crush collar.
That to picture is your problem right there, set it up again and hope the pattern is not set in real bad, remember with a T56 you will get some rear gear noise in 5th or 6th gear, buddies Camaro does that and so does my Bird.
Thanks for your reply. Am I correct in saying the pinion is in too far and needs a smaller shim to move the pattern toward the center on the drive side? Does that sound right? Strange that it was quiet for 700 miles and then seemed to instantly developed a LOUD whine overnight. Gears only have the 700 miles on them. There is also zero preload in the carrier. Should I add a little carrier bearing preload and check the pattern again before pulling the pinion bearing off?
I just confirmed that I have 5 cut face milled gears - I think most modern gears are 2 cut face hobbed. Patterns and adjustment are a bit different. Studying it, trying to learn and decide next steps.
Pattern is not centered. It's too far in. See that sharp edge on top? It's telling you that.
You probably also have too little backlash. How much is it?
Loose it up a bit. It should move the pattern towards the heel (center).
cool thanks - that's what I am thinking too. Backlash looked good @ .008 but I do not trust anything with the lack of carrier pre-load I found. After I receive the carrier shim set I will recheck pattern before I pull the pinion bearing.
I'd shoot for .006 and make sure the bearings are fully pressed on the carrier. I've seen rears that had the bearing .010 from seated, if run for a while it would have walked inward taking preload with it and throwing backlash way off.
Yes, the carrier should not just come out easily by hand. It should be snug enough you need to pry it out.