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#1 |
BigBlockBobby
Join Date: Mar 2004
Location: Lake Worth, Florida
Posts: 740
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open to posi problem?
Removed a 67 open 373 rear chunk and swapped a 72 308 posi into it . Swapped the ring gear from the open to the posi unit . I put the whole thing together and it has alot of free play between the pinion and the ring gear.plus it whines. I reassembled it the same way it came apart. Is there a difference in the 67 and the 72 rears? I know the 72 axles are longer but stiill 30 spline .
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Bob |
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#2 |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: open to posi problem?
A minor difference in thickness between the faces of the center section where the ring gear is bolted can cause a major change in the backlash between pinion and ring gear. By minor, I mean something on the order of a few thousandths of an inch. You will likely need to re-shim the center using a dial indicator to get the correct pattern and backlash. That will take care of the freeplay. Once it's correctly shimmed the whine should be reduced but probably won't go away for 100 mi or so.
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#3 |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: open to posi problem?
Whenever you swap the carrier (either open, posi, locker, spool, etc.) you have to completely reset the gears. Pinion depth, backlash, gear pattern, etc. If you don't you not only will get all types of weird noises, your gears won't last long.
Even though I was taught how to setup gears, it is still one thing I farm out to have done. Too much money involved to screw it up.
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... Last edited by chevy_mike; 03-22-2010 at 11:35 AM. |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: open to posi problem?
a service manual is very handy for doing jobs correctly
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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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#5 |
BigBlockBobby
Join Date: Mar 2004
Location: Lake Worth, Florida
Posts: 740
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Re: open to posi problem?
Thanks guys , I'm making some calls to find the right place to take it. I'd rather pay some one to get it done right.
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Bob |
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