Critique my gear patter

[MuntCuffin]

Finally getting back to an axle build after a 1.5 month hiatus...

2nd pattern. First had no backlash.

Backlash dead nuts on at .008.

Thinking need to increase pinion depth. How much? Not a clue, first time doing a gear install. Seems like its close.

Sd60

 

[TanTJJim]

That's way too shallow, I'd probably add 0.010" to pinion depth and check again.

If it helps I dont focus on backlash until pinion depth is set as long as it's close to spec. Might help save some time as you work through multiple shim changes

 

[MuntCuffin]

+.010 on pinion depth

 

[Captain Call]

Way shallow

 

[TanTJJim]

+.010 on pinion depth

That looks pretty good, I'd have no issues running that.

If it's for a crawler and you want to keep messing with it to get the best possible pattern for strength you could try getting it a little deeper like 2-3 thousandths and see what it looks like but you're really getting into splitting hairs now.

Just out of curiosity what's the cost side looks like?

 

[AgitatedPancake]

Agreed, that second pattern looks pretty good. And as TanTJim said, wouldn't hurt to see the other pattern as well

 

[Norm]

2nd pattern looks ok, how’s the coast side?

 

[Clb]

Needs an "N"

Post #2

 

[MuntCuffin]

Well, I thought it looked a little too pinion deep once I set backlash with the second pic.


Took out .004 pinion depth. Sitting here now.

Concentrating on drive side. Didnt bother checking coast side. Once I get an acceptable pattern, ill check coast.

Current backlash as it sits is .006, so its on the tighter side of spec. I think it looks acceptable, but I got untrained eyes.

 

[MuntCuffin]

Coast

 

[Johnny Longrifle]

What brand of gears? Yes, it does matter. Cheap gears will never get a perfect pattern.

More pinion depth still. Get that pattern right into the bottom of the ring gear with a tiny margin. Then adjust backlash to get it centered heel to toe.

 

[blakes]

I'd run those

So who will fess up to running very bad patterns?

The front 60 on my rig is so bad it's not even funny. Pinion got into the Detroit 10 years ago and still works. It's a front with hubs so...

 

[Johnny Longrifle]

When you're running your pattern check, put as much resistance on the ring as you can with the palm of your hand as you rotate the pinion. Give the gears a load so to speak.

 

[MuntCuffin]

What brand of gears? Yes, it does matter. Cheap gears will never get a perfect pattern.

More pinion depth still. Get that pattern right into the bottom of the ring gear with a tiny margin. Then adjust backlash to get it centered heel to toe.

They are cheap gears. Dana SVL.

Not sure I can build an inner bearing shim stack .002 deeper than what I got with what I got on hand.

 

[MuntCuffin]

When you're running your pattern check, put as much resistance on the ring as you can with the palm of your hand as you rotate the pinion. Give the gears a load so to speak.

Drive side pattern was checked with a rag + pry bar.

Coast was just hand resistance.

 

[TanTJJim]

Id honestly be happy with either of those last two patterns. I agree with johnny and would lean more towards a little deeper like the second pattern with the added 10 thou but you're the one with eyes on it.

 

[Johnny Longrifle]

They are cheap gears. Dana SVL.

Not sure I can build an inner bearing shim stack .002 deeper than what I got with what I got on hand.

If it was rear gear in a tow rig, I would like a deeper pattern. For a front gear in a 60, what you have is more than acceptable. It'll be fine.

 

[MuntCuffin]

If it was rear gear in a tow rig, I would like a deeper pattern. For a front gear in a 60, what you have is more than acceptable. It'll be fine.

Thank ya sir. Itll be in a 11k lb service truck, locked, running 35's.

 

[subybaja]

Looks shallow after you took the .004 out. Starting to smile up at the tip of the tooth.

The +.010 looked good, nice and oval. Imho.

 

[MuntCuffin]

I got the time to burn with the hisicane moving through. Imma see if I can add 2 thou to the pinion depth.

 

[Blacksheep10]

I agree with everybody above, it looked pretty centered on the tooth when you added that 10. I think I would go back to that

 

[JR4X]

When you're running your pattern check, put as much resistance on the ring as you can with the palm of your hand as you rotate the pinion. Give the gears a load so to speak.

If you do gears a lot. It’s worth the $5 bucks to buy a hickory hammer handle for a little ball peen from ACE. I find I can keep a more consistent pressure on the ring gear with one.

 

[MuntCuffin]

So I put back in .003 pinion depth. Adjust backlash to .008.

Kinda thinking its good, but open to opinions. Theres kinda a sharp cutoff at the root of the gear, is that just from shitty gears?

Drive side

Coast

 

[Captain Call]

I wouldn't run that. But, I'm not you. Probably be fine.

 

[MuntCuffin]

I wouldn't run that. But, I'm not you. Probably be fine.

Still too shallow?

 

[Captain Call]

You have this book yet?

 

[KarlVP]

The guy I learned how to set up gears from would love that last pattern.

I personally with bring the pinion out/away .002 and see what that got me.

 

[MuntCuffin]

Nope, don't have a book. Using pattern guides offered by the innerwebnet and the collective retardation of irate. I'll put it on my shopping list, looks like something I'd want on a shelf.

The guide patterns I found on the inner web says sharp lines on the top or the bottom of the pattern is bad. To me it looks like there is forming a sharp line at the bottom of the pattern at the root of the tooth. Flying by the seat of my big boy pants here.

 

[Captain Call]

I used this book when I rebuilt the 60 rear in my 79. Smooth as can be up to around 100 which is as fast as I want to go in it. I use every pony under the hood and pull trailers with it too.

 

[Captain Call]

I'm like you. Don't know shit about fuck on this. That's why I say get the book.