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08-01-2010, 10:20 PM
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#1 |
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Registered User
 
Join Date: Aug 2009
Location: Rochester, MN
Posts: 201
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Posi Swap
There is a posi rear differential for sale near me. The ad says it's from a '72 chevy truck. My truck doesn't have the a posi differential. Is it possible to just swap out the internals into my differential or are the housings different? I am going to have the differential rebuilt by a local shop eventually and would like do the posi conversion as well. I'd also like to not have to swap the differentials I've just rebuilt the brakes, and painted it.
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Blayne |
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08-02-2010, 12:47 AM
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#2 | |
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Senior Member
Join Date: May 2002
Location: Hammond, WI
Posts: 1,816
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Re: Posi Swap
housings are the same, and it should just bolt right in.
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD  Using your turn signal is not "giving information to the enemy" 67-72 FAQ Quote:
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08-02-2010, 11:18 AM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Rochester, MN
Posts: 201
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Re: Posi Swap
Awesome, that's what I thought but figured I should check to make certain before I bought it.
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Blayne |
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08-02-2010, 04:44 PM
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#4 |
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Registered User
Join Date: Apr 2010
Location: Mobile, AL
Posts: 365
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Re: Posi Swap
Don't you still have to measure the backlash and all?
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----------------------------------------- My 67 c10 Thread. http://67-72chevytrucks.com/vboard/s...d.php?t=409192 |
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08-02-2010, 04:46 PM
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#5 |
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Registered User
Join Date: Apr 2010
Location: Mobile, AL
Posts: 365
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Re: Posi Swap
Opps, sorry thought you meant you were going to just pull the old and put it in your housing, lol. I jumped the gun on that one!
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----------------------------------------- My 67 c10 Thread. http://67-72chevytrucks.com/vboard/s...d.php?t=409192 |
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08-02-2010, 05:12 PM
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#6 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Posi Swap
yes its not a matter of just ploping it in the typical measurements and clearances as per service manual should b followed to install and set the gears up
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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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08-02-2010, 05:21 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Rochester, MN
Posts: 201
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Re: Posi Swap
Just to clarify, it is possible to remove the posi unit from the donor differential, and properly install it into my housing? What about the ring and pinion? If my truck has a 3.43 gear and the donor has a 4.10 is it possible to use my 3.43 gear with the posi unit?
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Blayne |
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08-02-2010, 06:32 PM
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#8 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Posi Swap
yes you can switch them you'll need new shims and crush sleeve etc.
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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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08-02-2010, 07:36 PM
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#9 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Posi Swap
If you currently have 3.42 gears and the Posi unit that you are looking at is made for 4.10s, you are out of luck.
The 3.42 gears will not work on a 4 series carrier. You would have to jump up to at least 3.73. Either way you really need a Professional to do this install. It is very critical that it be done correctly....and it gets expensive when it's not done right.
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You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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08-03-2010, 09:25 AM
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#10 |
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Registered User
Join Date: Aug 2009
Location: Rochester, MN
Posts: 201
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Re: Posi Swap
I am definitely going to have a local shop do the work. I have already spoken to them about doing a rebuild. Hopefully it will be a rebuild with a posi swap!
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Blayne |
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