help used posi carrier locking up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

camaro69cool · 03-08-2009, 06:58 PM

the new ring install went great with the help i got from you all but the used posi from the junk yard is locking up it does not do it all the time i put about 150 miles on it hopping it would free up it seems to be doing it more when it heats up from diving is there anything i can do to save it ? oh and yes i did add the posi oil thaks frank

JimKshortstep4x4 · 03-08-2009, 07:06 PM

Did you take the possi apart and go through it?

I assume by locking up it won't go around a corner without sliding the tire(s).

I have only seen them seriously lock up when the spider gears were chewed up or the clutches were rusted together.

My suggestion would be tp pull the cover and check it out!

Jim

camaro69cool · 03-08-2009, 07:17 PM

i did not take it apart it is not sliding the tire kind of like it is not releaseing and not all the time a guy told me to do figure 8 s in a large parking lot i did and it did fine but when i went to pull out it did it the spider gears look fine

JimKshortstep4x4 · 03-08-2009, 07:30 PM

The possi units are engaged at all times so the plates or other locking mechanisms have to slip when the truck goes around a corner.

I assume you have a clutch type possi unit and not a "gove" unit.

If it is a clutch possi, try adding more possi additive.

Jim

cdowns · 03-08-2009, 07:45 PM

use royal purple synthwetic instead of regular and the additive

camaro69cool · 03-09-2009, 06:57 PM

i went ahead and took the posi clutch out they seam fine but they are sticking too eash other but it seams to be from the grease is this normal and if not what can i clean them with ? brake cleaner?
thanks frank

lilred67 · 03-09-2009, 09:31 PM

the posi in my '70 was doing the same thing! i added posi fluid(cheap stuff) to it when i filled it with valvoline 85/90 dino gear oil and added more posi additive. it was still sticking. i drained the fluid, added some GM posi additive and mobil 1 gear oil and cured the problem...

camaro69cool · 03-12-2009, 07:39 PM

cleaned the posi pack with brake cleaner and add gm oil and addiv works great thank for the help frank

03-08-2009, 06:58 PM	#1
camaro69cool Registered User Join Date: Jan 2008 Location: walker wv Posts: 23	help used posi carrier locking up the new ring install went great with the help i got from you all but the used posi from the junk yard is locking up it does not do it all the time i put about 150 miles on it hopping it would free up it seems to be doing it more when it heats up from diving is there anything i can do to save it ? oh and yes i did add the posi oil thaks frank

03-08-2009, 07:06 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: help used posi carrier locking up Did you take the possi apart and go through it? I assume by locking up it won't go around a corner without sliding the tire(s). I have only seen them seriously lock up when the spider gears were chewed up or the clutches were rusted together. My suggestion would be tp pull the cover and check it out! Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

03-08-2009, 07:17 PM	#3
camaro69cool Registered User Join Date: Jan 2008 Location: walker wv Posts: 23	Re: help used posi carrier locking up i did not take it apart it is not sliding the tire kind of like it is not releaseing and not all the time a guy told me to do figure 8 s in a large parking lot i did and it did fine but when i went to pull out it did it the spider gears look fine

03-08-2009, 07:30 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: help used posi carrier locking up The possi units are engaged at all times so the plates or other locking mechanisms have to slip when the truck goes around a corner. I assume you have a clutch type possi unit and not a "gove" unit. If it is a clutch possi, try adding more possi additive. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

03-08-2009, 07:45 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: help used posi carrier locking up use royal purple synthwetic instead of regular and the additive __________________ 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

03-09-2009, 06:57 PM	#6
camaro69cool Registered User Join Date: Jan 2008 Location: walker wv Posts: 23	Re: help used posi carrier locking up i went ahead and took the posi clutch out they seam fine but they are sticking too eash other but it seams to be from the grease is this normal and if not what can i clean them with ? brake cleaner? thanks frank

03-09-2009, 09:31 PM	#7
lilred67 Senior Member Join Date: Mar 2005 Location: weatherford,texas Posts: 1,003	Re: help used posi carrier locking up the posi in my '70 was doing the same thing! i added posi fluid(cheap stuff) to it when i filled it with valvoline 85/90 dino gear oil and added more posi additive. it was still sticking. i drained the fluid, added some GM posi additive and mobil 1 gear oil and cured the problem...

03-12-2009, 07:39 PM	#8
camaro69cool Registered User Join Date: Jan 2008 Location: walker wv Posts: 23	Re: help used posi carrier locking up cleaned the posi pack with brake cleaner and add gm oil and addiv works great thank for the help frank

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