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02-23-2007, 09:20 PM
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#1 |
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Registered User
Join Date: Feb 2007
Location: Winston Salem, NC
Posts: 310
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Rearend gear ?
Ok. I pulled the cover off the rear diff and was hoping somebody could help me decode the numbers I got off the ring gear.
here they are as I read them: 381778 11 : 41 GM 2 - 72 1 I can get a picture if needed. Thanks in advance
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72  LWB
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02-23-2007, 09:39 PM
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#2 |
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Senior Member
 Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,289
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Re: Rearend gear ?
373.
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02-23-2007, 09:41 PM
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#3 |
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Registered User
Join Date: Feb 2007
Location: Winston Salem, NC
Posts: 310
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Re: Rearend gear ?
how do you come up with that?
is there something that visually says if its a posi or not? i can spin right rear with left on the ground
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72 LWB
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02-23-2007, 09:48 PM
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#4 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,886
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Re: Rearend gear ?
41/11= 3.73. You has an open diff.if you can spin one with other down.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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02-23-2007, 09:46 PM
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#5 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: Rearend gear ?
11:41.......3.73 gearset,cant help much with the rest tho....
 L
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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02-23-2007, 10:03 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Winston Salem, NC
Posts: 310
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Re: Rearend gear ?
Was really hoping for a posi diff. The truck was originally a 6 cyl. with 3 on tree. figured it was posi till today
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72 LWB
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02-23-2007, 10:06 PM
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#7 |
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SWB 4X4 CLUB
Join Date: Feb 2005
Location: PA
Posts: 1,088
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Re: Rearend gear ?
pic of posi
Jason |
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02-23-2007, 10:34 PM
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#8 |
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Registered User
Join Date: Feb 2007
Location: Winston Salem, NC
Posts: 310
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Re: Rearend gear ?
awww i see. mine has no springs
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72 LWB
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02-24-2007, 12:11 AM
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#9 |
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ASE Certified Spoon Operator
Join Date: Oct 2006
Location: Colorado Springs, CO
Posts: 157
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Re: Rearend gear ?
Luckily the build sheet was intact with this parts truck, 4.10 positrac axle!!! Also, aren't there tags on the diff cover that say something like "Limited slip gear oil only"? Easiest way to check is to jack up the pumpkin and spin one tire. Spin opposite, open diff. Same direction, POSI!! Can't wait to put this axle to work...
Frame and cab are for sale, has a 305 roller cam from 87-91. It's plenty fun now though... I got it down to 'racing weight'.
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My six is bigger than your eight  67 K20 292 +.060" SM465 NP203 3.73s 86 4Runner, the daily on 31s 85 4Runner, the wheeler on 38s 92 x-cab truggy project for 2017... tons and 42s and V8 power 
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