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Gear pattern check ? (updated .008 lash) Installing hubs now?

cuervo

cuervo

Runn'n down a dream!
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Hey all,

I'm checking the pattern on this 14bff. It has 34 lbs preload(all new bearings, both pinion and carrier) on the pinion with the seal in place and I've got backlash at .004 right now. I'm having issues with getting a good pattern, but I think that's because I'm trying to get it with just someone holding a disc brake with gloves and an axle in.

Check it out.

gear1.jpg



and

gear2.jpg


It starts low then goes middle then high, but I think that is from not getting even pressure through out the pinion turn.

Thoughts?
 
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That pattern looks fine, what about the drive side?

Also, .004" sounds a little tight for the backlash and 34 lbs. of pinion bearing preload sounds like a bit much, what are the specs (its been a while since I did a 14 bolt).
 
Looks spot on!!:waytogo:

Is the 34 in lbs just the pinion? That's perfect if it has new bearings. If it has used bearings you'll need to replace the crush sleeve and try for 10-15 in. lbs.

Do you have good preload on the carrier bearings as well? I like an additional 6 or 8 in lbs of pinion turning force with the carrier installed. So you should have a reading of 40 in. lbs with it all assembled.
 
The specs are: .003-.008 backlash with .005-.008 preferred. Pinion turning force of 25-35 in. lbs. with new bearings and 5-15 in lbs. with used bearings.

I just noticed your picture are both of the coast side do you have any of the drive side?
 
It's used gears and new bearings. I thought +35 was on the highend of preload, so I went with that with the seal on and yes that was with the pinion carrier out of the axle and just in a vise. I thought I posted the second photo of drive side, grrr. I'll have to load the camera back up.
 
If what they say about used gears is true (which is that the coast side is the one to pay attention to) then its perfect. I've never setup used gears before but I have done tons of new ones.
 
38377k5 said:
If what they say about used gears is true (which is that the coast side is the one to pay attention to) then its perfect. I've never setup used gears before but I have done tons of new ones.
Click to expand...

It's my first set new or used. Which is why I'm looking for advise. Anyone else?
 
I have done used gears before, don't expect to get a perfect pattern out of them I thought your first one was a little low but that second one looks great, I would run them.
 
One the coast side, it does look better. It looks like it is engaging throughout the entire rotation.

The drive side looks strange to me wide at one end and narrow at the other. This is what's giving me second thoughts on if it's "ok" or not.
 
The other question I have, not related to this topic but same area.

The little round magnet that is in the bottom of the axle housing, what is used to hold that in place?

Thanks.
 
On used gears its the coast side you want to watch. And to me it looks like the pinion is a little close to the ring gear. The easiest way to add drag I've found is a big screwdriver wedged between the case and the joint where the ring gear and pinion meet. It will add vertical pressure but not move the carrier sideways.

You could try running it as is, if it don't make noise then you're good to go. Although some brands of gears are noisy from the start. Factory gears are usually very quiet if done right.
 
Cuervo... I've only done this once, and it was with used gears. I would've preferred to learn on new gears since the pattern would be easier to see, but...oh well.

I was told repeatedly (like others have said) that the coast side is what you look at on used gears. My drive side was producing a pattern that was even harder to read than yours. Having said that, I think the coast side looks alright in the second set of pics.

I'd run it. :thumb:
 
readymix said:
Looks like you got it.
Click to expand...

Thanks, nice broken truck site you have, BTW.


NVM, i found what a I need. Nothing left but to get the eBrake cables made for the disc brake swap and weld on the new perches!!

Thanks a ton guys!
 
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Well, I got the rearend installed and took it out for a run. It's quiet and smooth all around until you get to about 65 or 70 and lift off the gas. It has some vibration noises when lifting of the gas and letting the gears slow you down. I'm guessing since these are used gears that the coast side isn't set the same as it was before.

Ideas?
 
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