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06-02-2024, 04:59 PM
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#1 |
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Senior Member
 
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 591
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ignorant 12 bolt question
While adjusting rear drums, one wheel in the air, tranny in neutral...
Rotating the rear hub by hand ~1/2 turn each way, I noticed different resistance going forward vs backward. Same with the drum off, so brakes not involved Is that unusual?
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1970 C10 Custom longbed 350/350 |
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06-02-2024, 05:46 PM
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#2 | |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,502
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Re: ignorant 12 bolt question
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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06-03-2024, 12:54 AM
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#3 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 591
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Re: ignorant 12 bolt question
No limited slip on the SPID
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1970 C10 Custom longbed 350/350 |
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06-03-2024, 01:39 AM
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#4 |
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Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,881
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Re: ignorant 12 bolt question
I would run it. But if you are worried about the axle maybe disconnect the driveshaft and try the test again with the drums off. Would bet what you are thinking is a problem goes away.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 06-03-2024 at 01:45 AM. |
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06-03-2024, 02:03 PM
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#5 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,218
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Re: ignorant 12 bolt question
.
Recently I noticed the same thing on my 12 bolt posi equipped '67 while adjusting the rear drums. In neutral, it was way easier to turn the wheels one way vs the other way...don't remember which was which though. I used the easy turn to finish what I was doing and didn't think about it again until reading this post! -Kevin
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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06-03-2024, 04:58 PM
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#6 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 591
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Re: ignorant 12 bolt question
It felt the same without the drums. It wasn't alarming, but I couldn't think of a reason it'd be different.
I need to swap the diff gasket and pinion anyway, so if there's anything wonky in there, I'll know soon enough. Thanks
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1970 C10 Custom longbed 350/350 |
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06-03-2024, 05:39 PM
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#7 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: ignorant 12 bolt question
The difference is the resistance caused by turning the pinon shaft. If the ring and pinion were straight cut gears the torque to turn would be the same in both directions. With hypoid cut gears there is more drag induced when turning. The amount of drag differs depending on the direction turned. The amount of torque to turn is magnified by using the axle to turn the pinion or in other words driving the gears backwards.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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06-03-2024, 06:04 PM
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#8 | |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,218
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Re: ignorant 12 bolt question
Quote:
Science! -Kevin
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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06-03-2024, 06:30 PM
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#9 | |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 591
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Re: ignorant 12 bolt question
Quote:
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1970 C10 Custom longbed 350/350 |
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