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06-29-2005, 10:50 PM
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#1 |
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Senior Member
 
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,190
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How do you id the ratio on rear gears?
Now I know this one has probably been on here 100 times, but I'm considering buying a posi rear with 3:73 ring and pinion gears. Can someone tell me what numbers and/or tooth count which would identify the correct ratio? Also, anything to look out for in the posi (pics only)?
Any info or suggestions are very much appreciated. Thanks. Scott |
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06-29-2005, 10:56 PM
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#2 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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It's been asked enough that I know the answer
 Put a mark on the driveshaft. Lift one rear tire and release the e-brake. Count how many times you gotta spin the tire for the mark on the driveshaft to make one full rotation. Thta equals (approximately) your gear ratio. Example: If it takes 3¾ tire spins to make the driveshaft travel around once, you have 3.73 gears or close to it. 3 times would be 3.07 or whatever. 4 would be 4.11 or whatever. I don't know the exact numbers, I'm taking those off my head from reading previous other posts.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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06-29-2005, 11:25 PM
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#3 | |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Quote:
jackup BOTH wheels rotate the DRIVESHAFT 33/4 turns of the DRIVESHAFT makes the wheel turn 1revolution is 3:73gears
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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06-30-2005, 11:46 AM
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#4 | |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Quote:
 )
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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06-29-2005, 10:58 PM
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#5 | |
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Keep On Truckin'
Join Date: Mar 2003
Location: Buda, Texas
Posts: 1,354
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Divide the ring gear tooth count by the pinion gear tooth count to get the ratio. I don't recall the tooth count for 3:73's but the math above will tell you what you got..
Quote:
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Just Passin' Thru Some projects are like herding cats; others are like putting out fires; this one was like herding cats on fire..... |
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06-29-2005, 11:53 PM
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#6 |
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Senior Member
  
Join Date: Jan 2005
Location: CA
Posts: 5,775
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I believe the ring has 41 teeth and the pinion has 11 on a 3.73. The ring gear should have 41:11 stamped on the outer diameter.
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06-30-2005, 12:50 AM
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#7 | |
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Registered User
Join Date: Jun 2005
Location: Sacramento CA
Posts: 1,255
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Quote:
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Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck. |
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06-30-2005, 02:24 AM
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#8 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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pjmoreland had it right 41/11 for a 3.73...at least that is what I counted on mine!
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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06-30-2005, 09:19 AM
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#9 |
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Senior Member
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,190
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Thanks guys. The info Pjmoreland provided was what I was looking for, as the components will be removed from the housing (should have mentioned that previously).
Thanks again for everyones input. |
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