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Old 04-08-2014, 02:42 PM   #1
Mieser3
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1967 Posi Unit

Can a posi unit from a 1967 six lug rear end be swapped with a non-posi 1971 5 lug rear? I picked up a 1967 SWB the other day that has a factory 3.73 posi and was wondering if I could use it in my 1971 project?
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Old 04-08-2014, 05:12 PM   #2
aggie91
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Re: 1967 Posi Unit

If you are talking about just the Posi carrier and gears, then yes it can. If you are talking about swapping the complete rearend, then sort of. The '67 housing will bolt inplace of the '71 housing, but the axles and overall length of hte '67 is shorter. The '65-'69 6 lug and part of '70 model year 6 lug rearends are shorter by aboutr 1.5" overall than the late '70 6 lug and the '71 up 5 lug rearends.

You can swap out the carriers, just like you would to do a gear change or rebuild of the center section. The carrier is the same from '65 to about '81 or so when GM stopped using the 12 bolt in the 1/2 ton trucks.
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Old 04-08-2014, 06:51 PM   #3
Mieser3
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Re: 1967 Posi Unit

Yes, I was talking about just swapping out the carrier and gears. Thanks for the information.
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1956 Chevy 210 Sedan
1970 Camaro Z-28/RS
1970 Chevelle SS 396 (numbers matching L34 car)
1971 Chevy SWB Fleetside with 1967 front clip - in progress
My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438156
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Old 04-11-2014, 01:23 PM   #4
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Re: 1967 Posi Unit

Does anyone make 5 lug rear axles to swap into a 1967 6 lug rear end? Seems like it would be less work to use the 1967 rear end with posi that I have and just put new 5 lug axles in it. I am running disc brakes on the rear so I wouldn't need to worry about backing plates.
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1956 Chevy 210 Sedan
1970 Camaro Z-28/RS
1970 Chevelle SS 396 (numbers matching L34 car)
1971 Chevy SWB Fleetside with 1967 front clip - in progress
My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=438156
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Old 04-11-2014, 02:50 PM   #5
Clyde65
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Re: 1967 Posi Unit

http://www.moserengineering.com/axle...spline-30.html
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Old 04-14-2014, 11:29 AM   #6
aggie91
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Re: 1967 Posi Unit

Travis at Pro Performance can get a better price then that for the exact same part. He is a vendor on this forum. he has a Moser thread going....
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1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues)
http://67-72chevytrucks.com/vboard/s...d.php?t=372424

The LST Challenge:
http://67-72chevytrucks.com/vboard/s...=1#post7812257

Korbin's 1st Square: "Sunburn"
http://67-72chevytrucks.com/vboard/s...d.php?t=418618

1985 GMC Sierra: "White Trash", Korbin's 2nd now...
http://67-72chevytrucks.com/vboard/s...d.php?t=632305

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