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Author Topic:   ring gear backlash
XR7
Gearhead

Posts: 129
From: north Idaho
Registered: Mar 2003

posted 07-15-2004 10:43 PM     Click Here to See the Profile for XR7     Edit/Delete Message   Reply w/Quote
How much backlash should you run on a 4-speed drag car? I set mine up with .006 and later had a guy tell me it should have been .003, well that sounds awfully tight to me. In the shop manual it says .008 - .012 but that's for a street car. Am I too loose or not? It had a good pattern on the toe side, what do you think? Thanks

------------------
68 Cougar XR7, 428 4-speed, Best ET 6.82 @ 101 1/8, 10.69@ 127.44 with 1.51 60 ft. Street legal all steel car w/ full interior.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-15-2004 11:11 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
It's fine,

I usually go for .008-.010 backlash.

SteveW

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BLUE
Gearhead

Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002

posted 07-16-2004 09:51 AM     Click Here to See the Profile for BLUE     Edit/Delete Message   Reply w/Quote
this is a stupid question but is backlash basically the slop between the pinion and the ring gear? also if i attempt to do my gears could i post a picture of the pattern up and you guys tell me if it is right. i am having a hard time finding anyone who will do gears and the cheapest guy right now is $390 labor WOW i could buy three sets of gears for that price.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 10:16 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by BLUE:
this is a stupid question but is backlash basically the slop between the pinion and the ring gear? also if i attempt to do my gears could i post a picture of the pattern up and you guys tell me if it is right.

Yes, and sure!

SteveW

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BLUE
Gearhead

Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002

posted 07-16-2004 02:55 PM     Click Here to See the Profile for BLUE     Edit/Delete Message   Reply w/Quote
steve, yes it was a stupid question and sure i could post pics?

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 03:02 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Blue,

Yes, backlash is basically the slop between the pinion and the ring gear.
And, sure you can post pics.

SteveW

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 03:04 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Blue,

You didn't ask if it was a stupid question.

SteveW

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BLUE
Gearhead

Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002

posted 07-16-2004 03:14 PM     Click Here to See the Profile for BLUE     Edit/Delete Message   Reply w/Quote
aha i thought i said "is this" instead of "this is" i stand corrected. i was just trying to be a smart a$$ and it backfired, that is how things usually go for me.
can you tell me what i will need to do this job. should i just buy one of the kits that has shims, grease, carrier bearings?
i think i am going to attempt this as i really want to learn how to do these, and the only way i can learn is to just do it.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 03:22 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
You'll need a pinion depth gauge, dial indicator, good shop manual, the installation kit, and a lot of attention to detail. Someone looking over your shoulder for your first time is a big plus.
I think I've seen video instructions on e-bay too.

SteveW

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 03:31 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Here you go,

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7911314912&category=33550&sspagename=WDVW

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thumpin cat
Gearhead

Posts: 458
From: Santa Barbara, California
Registered: Mar 2002

posted 07-16-2004 03:52 PM     Click Here to See the Profile for thumpin cat     Edit/Delete Message   Reply w/Quote
Do you have to have the pinion depth gauge or is there a more time consuming method?

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 04:02 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
You can do it w/o a pinion depth gauge, but it's more time consuming. You'll be checking contact patterns and adjusting the pinion depth based on the contact patterns.

SteveW

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BLUE
Gearhead

Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002

posted 07-16-2004 04:36 PM     Click Here to See the Profile for BLUE     Edit/Delete Message   Reply w/Quote
so where do you get a pinion depth gauge ?

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 04:57 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
http://www.randysringandpinion.com/products/product.asp

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BLUE
Gearhead

Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002

posted 07-16-2004 06:49 PM     Click Here to See the Profile for BLUE     Edit/Delete Message   Reply w/Quote
o.k. can you explain to me what bearing pre load is. and i am trying to picture how i will keep ring gear from moving when trying to crush sleeve? the rest i think i understand.

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steve'66
Gearhead

Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2004 08:18 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
For crushing the crush sleeve I just clamp the yoke in my bench vice. Bearing preload is just that load on the bearing at rest. When you tighten the carrier bearings you tighten them a little more to preload the bearings. The crush sleeve preloads the pinion automatically.

Steve

p.s. Anyone else want to jump in on this, please do.

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67mustangdsa
Journeyman

Posts: 45
From: Xenia Ohio
Registered: Jan 2004

posted 07-19-2004 10:14 AM     Click Here to See the Profile for 67mustangdsa   Click Here to Email 67mustangdsa     Edit/Delete Message   Reply w/Quote
Does the gear have the specs on it? A lot of times, the ring gear will have the backlash on it, at least with Richmond. Anyway, I like using the solid spacer/shim setup instead of the crush sleeve. It allows you to adjust your bearing preload a little bit. I might be a little anal but I like to preload my bearing a little light to reduce drag. Plus, you can use the spacer over and over. Just a thought
Shawn

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