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Gear Pattern Checks

Luke,
Putting her back together now. I don't think the .004 B/L is going to be a concern right now. I will post the results of my test run later. - Wes
 
in spec is in spec can't fault it. give a boot and see what happens. you'll know pretty quick if its good or not. drive till it heats up too though.
 
pierce88K5 said:
I decreased the pinion shim to .010. Here are the results. Looks like it is closer to the center of the gear, but B/L is now .004. Still within specs, but on the low side. - Wes
Click to expand...

The pattern is too deep, look how the pattern is not oval shaped anymore and its crescent shaped.

DEMON44 said:
ok.....but he's got noisy gears..... and that poor pattern.
Click to expand...

I'm not convinced the noise he's hearing is from gears. He described the noise as "At about 50 mph I have a slight vibration and a grumbling noise when I let off the gas". My guess is that is related to driveline angles, bearings in the 208 or a worn slip yoke, etc. especially if he's just now switching to lower gears which as I said before will spin the driveshaft faster at the same speed than it did before.


pierce88K5 said:
Chris,
Thanks for you help. I really appreciate your input and don't want to start a tech war here. No where else can I go to get good advice on working on a K5 than here! Keep charging and I will let you know how the vibration check goes later. - Wes
Click to expand...

No offense there and I have nothing against anyone here. We're all just here to help, even if some arguing is involved. You ask for opinions and you get them :thumb:
 
Oh ya no problems.

you change the backlash by shifting the carrier side to side, after a good pattern is obtained.



let 'er buck.
 
Chris,
Just returned from the test drive. The vibration was worse than before. I am going back to the original shim of .013, maybe even go the other direction to .017. Seems to be less vibration with the pinion further out from the ring gear.
Also, I did notice this last time I had the drive shaft out that the slip yoke in the transmission tail housing was a little loose. Say maybe a 1/16 of movement side to side. Could this be the cause of the vibration? It is past midnight here and I will take a look at it tomorrow. - Wes
 
pierce88K5 said:
Chris,
Just returned from the test drive. The vibration was worse than before. I am going back to the original shim of .013, maybe even go the other direction to .017. Seems to be less vibration with the pinion further out from the ring gear.
Also, I did notice this last time I had the drive shaft out that the slip yoke in the transmission tail housing was a little loose. Say maybe a 1/16 of movement side to side. Could this be the cause of the vibration? It is past midnight here and I will take a look at it tomorrow. - Wes
Click to expand...

First, you don't need to talk to me specifically, I'm not the only one that knows gears ;)

But I do like your .013 pattern, I'd run that.

On a slip yoke setup, with the driveshaft out, the output yoke will have play because it relies on the driveshaft itself to sit against a bushing and take up that play. If there is play with the driveshaft in there, then you may have an issue.

The only way a rear end can really cause a vibration is if the pinion bearings are toast. Probably not your problem.

So you are just now switching to 4.56's right? Not just changing carriers?
 
I did change carriers. I had the Gov Lock in it originally with 3.73 gears so I purchased a new 4.56 and up open carrier and installed a Grizzly Locker from Yukon. I replaced the pinion bearings so I am pretty sure they are not toast (only test drove the truck for about a total of 30 miles so far). The drive shaft has some play with it installed, about 1/16th of an inch wobble. I will probably work on it some more this weekend when I have more time. Looks like I might have some driveshaft issues with the new higher speeds I am turning with the 4.56 gears. Might be looking into a new drivshaft and a SYE for the 208. - Wes
 
how good are your ujoints....they can cause a vibe too.
 
New u-joints front and rear with the cardigan joint rebuilt about 6 months ago. I am not sure if it was rebalanced or not when the cardigan joint was rebuilt. I have thought about getting it checked. I did not have any vibration problems before when I put the 14 BFF in at the beginning. The vibration started after regearing it to 4.56. - Wes
 
pierce88K5 said:
New u-joints front and rear with the cardigan joint rebuilt about 6 months ago. I am not sure if it was rebalanced or not when the cardigan joint was rebuilt. I have thought about getting it checked. I did not have any vibration problems before when I put the 14 BFF in at the beginning. The vibration started after regearing it to 4.56. - Wes
Click to expand...

Is your rear shaft a double cardan (cv) style shaft?

What do your u-joint operating angles look like?
 
pierce88K5 said:
I have the double cardigan joint rear driveshaft. My driveshaft angles are the following:
Click to expand...

Its double cardan ;)

The angle looks good, doubtful that's your problem.

I REALLY doubt the problem is related to your gearset.

I still bet this noise came about because everything in the drivetrain is now spinning faster at the same wheel speed and your 4.56's have amplified some other existing issue.
 
Set the shim out to .015 and replaced the rear u-joint and it still vibrates. Something not right is set in the rear end. I had a friend who is a retired, semi-pro drag racer (two-car bay with all of his power tools) set up my pinion so I will probably go over to his house and see if I can get his help in setting everything else up. He just does'nt like to crawl around under things anymore now that he is getting older. I am pretty sure I can convince him to help me out. Otherwise, I am going to pull everything apart and start all over. That's what I love about having this thing. It is paid for and I can tinker with it as much as I can until I get it right.
 
you have to shift the carrier to change your backlash. after you have the pinion set. I said that before once already.

You were 1 step away from paydirrt, but kept messing with the pinion. the pinion is not the only adjustment is a gear setup.
 
Sorry, Luke. I moved the pinion out to .032 got the following gear pattern:


I moved the pinion in one large .017 shim out from the current .015 shim and I believe there is more pinion contact with the ring now, but the backlash is way too much. I am going to have to reset the B/L to the new pattern if this is a better pattern. - Wes

032 shim.jpg
 
pierce88K5 said:
Sorry, Luke. I moved the pinion out to .032 got the following gear pattern:


I moved the pinion in one large .017 shim out from the current .015 shim and I believe there is more pinion contact with the ring now, but the backlash is way too much. I am going to have to reset the B/L to the new pattern if this is a better pattern. - Wes
Click to expand...

Always set the backlash before you take a pattern, the pattern doesn't mean much if the backlash isn't right.
 
I will get that done and get a set of pics up soon. Getting close to midnight here. May be done in the morning. - Wes
 
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