d30 backlash opinions once again

johnny9 · 10-03-2009, 11:50 AM

second time doing this and havent set up a diff for 20 ro so years so would like a more profesional opinion from someone whos done it more than me..ive looked at forum pics and it seems to be fine..
only thing stopping me from the axle being done is it seems like the teeth of the gear should be deeper in the groove???
maybe im wrong?
i have 6 thousands backlash and a decent pattern and correct preload on everything also..just seems like the teeth should be deeper?

oh yeah,this is a slightly used set of 4.56 gears w/low miles..it also has a thick ring gear compared to the stock 3.07 had but i asume thats just normal also..front end is a 2004 d 30..

opinions please,thanks in advance,john

LarryN · 10-03-2009, 12:03 PM

Did you use the correct carrier for 4.56? The break is 3.54 down and 3.73 and up.

Max-Q · 10-03-2009, 12:31 PM

We just installed my 4.56 ring and pinion in my D30 on Thursday. For whatever reason I can't make out the pattern on your pics.

I assume you got a new carrier for the larger gear? I had 3.07 too and had to buy a new empty carrier. I installed a locker to fill her up

I'd love to help but I can't tell from the pics, sorry.

johnny9 · 10-03-2009, 08:50 PM

Quote:

Originally Posted by LarryN

Did you use the correct carrier for 4.56? The break is 3.54 down and 3.73 and up.

the carrier was already assembled with the gear from a buddy so i dissasembled it and cleaned and torqed everything back down and locktite the ring bolts.
i couldnt tell,or dont know how tell the diffrence in the carriers??
but it was used in a buddys jeep for a few thousand miles while he built his arb axle and got new gears himself,then i got his carrier and gears and a hole dana 30 from a 2004 model.
it looks and feels and checks out good i was just wondering about the depth of the gears??
DOES IT LOOK OK..AT 5-6 THOUSANDS BACKLASH I WOULDNT THINK I COULD GET NO BETTER..HOWS THE MESH LOOK 2 YOU GUYS?

johnny9 · 10-03-2009, 08:51 PM

Quote:

Originally Posted by LarryN

Did you use the correct carrier for 4.56? The break is 3.54 down and 3.73 and up.

IF THE CARRIER WASNT CORRECT I WOULDNT GET THESE GOOD READINGS WOULD I

ET48 · 10-03-2009, 09:12 PM

Looks to me like your tooth contact is too long. Your pattern extends to the OD of the ring gear and the ID of the ring gear. You should be able to see the end of the pattern before it goes off the edge. As far as what you asked, its pretty close to what I can see. White is one of the hardest dies to see I think. Try using yellow or blue blueing compound.....

2000jeeper · 10-03-2009, 10:42 PM

The pattern on the drive side of the gear is to large. Normally the pattern should be oval shaped and centered on the tooth. But like said before white is a hard marking compound to read. I use yellow and blue on occasion.

LarryN · 10-03-2009, 10:45 PM

The pattern and wipe look fine, but it does look like the pinion is too deep to me.

**bddisi** · 10-03-2009, 10:47 PM

Im kinda like ET48, I like to be able to see the pattern come back before the end of the tooth. I also put yellow on there and roll the ring around a couple of times while holding a little pressure against it. Then look at the pattern. But, thats just me.....

**mudb8** · 10-04-2009, 12:48 AM

pic of the other side?

it can be to deep or shallow and have a perfect pattern on one side....

**fratis** · 10-04-2009, 03:13 AM

i actually always check the factory pattern before taking it apart. you would be surprised at some of the patterns that work fine. worked on a 9" that looked like absolute crap. there is a larger margin of error then people think. also this is the front end and will see a lot less use then the rear. my first 30 setup was so bad the pinion was practically flopping around after a couple days. i wheeled it the day after with no break-in. the pattern was ...err...less then spectacular and it has worked for years. broke everything around it.

looks fine to me. the pattern shouldnt go all the way to the root of the gear anyways. run it.

johnny9 · 10-04-2009, 08:33 AM

im gonna go get some yellow marking compound in a few minutes and mark it again and snap some pics..
thanks for all yalls help very much..
the original 3.07 factory gears have the same exact wear pattern,not rounded on the corners and goes flat off the end of the gear like this one,the only thing i was concerned with was that it didnt look like the gears went as deep in the groove of the ring gear as the original gears.
but at .006 backlash i figure its purdy good..

i will post some other pics soon before buttening up the front axle and starting on the rear..

ET48 · 10-04-2009, 09:33 AM

Make sure you put some load on the pinion when you rotate the gears through the marking compound, it makes it even easier to see.

**mudb8** · 10-04-2009, 12:37 PM

Quote:

Originally Posted by fratis

i actually always check the factory pattern before taking it apart. you would be surprised at some of the patterns that work fine. worked on a 9" that looked like absolute crap. there is a larger margin of error then people think. also this is the front end and will see a lot less use then the rear. my first 30 setup was so bad the pinion was practically flopping around after a couple days. i wheeled it the day after with no break-in. the pattern was ...err...less then spectacular and it has worked for years. broke everything around it.

looks fine to me. the pattern shouldnt go all the way to the root of the gear anyways. run it.

yep, there is a margin of error that lies within .005... after that the gears can make noise or prematurely fail..

like jerry bransford says.... do it right or not at all!

I also learn some things the hard way.

**fratis** · 10-04-2009, 01:16 PM

Quote:

Originally Posted by mudb8

yep, there is a margin of error that lies within .005... after that the gears can make noise or prematurely fail..

we are discussing the look of a gear pattern. how are you going to quantify .005 by looking at it? exactly which parameter are you referring to? are you referring to the backlash? this has already been confirmed by the op and can be independent of the pattern.

where did you get this spec. if you got it from a tech manual why didnt you footnote or at least site your reference? or did you make this up? real world experience has taught me otherwise. ive seen it with my own eyes. if you read manuals they will even state that due to the machining of the housing it is often impossible to get a "perfect" looking pattern. -yukon gear/ richmond gear manual.

im not stating to do it wrong on purpose. my point was simply dont kill yourself trying to get the pattern to look "perfect" or simply like others posted.

ill agree to disagree.