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Author
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Topic: ring gear backlash
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XR7
Gearhead Posts: 129
From: north Idaho
Registered: Mar 2003
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posted 07-15-2004 10:43 PM
  
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
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posted 07-15-2004 11:11 PM
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
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posted 07-16-2004 09:51 AM
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
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posted 07-16-2004 10:16 AM
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
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posted 07-16-2004 02:55 PM
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
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posted 07-16-2004 03:02 PM
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
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posted 07-16-2004 03:04 PM
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
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posted 07-16-2004 03:14 PM
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
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posted 07-16-2004 03:22 PM
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
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posted 07-16-2004 03:31 PM
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
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posted 07-16-2004 03:52 PM
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
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posted 07-16-2004 04:02 PM
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
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posted 07-16-2004 04:36 PM
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
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posted 07-16-2004 04:57 PM
http://www.randysringandpinion.com/products/product.asp
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BLUE
Gearhead Posts: 173
From: COLLINSVILLE, IL
Registered: May 2002
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posted 07-16-2004 06:49 PM
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
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posted 07-16-2004 08:18 PM
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
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posted 07-19-2004 10:14 AM
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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