changing seals and bearing in a 308 posi rear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smoky02 · 08-09-2007, 11:57 AM

Ok, I have a 308 rear end, that's not a true posi, but it has the springs in it, so I know it's not just an open rear end, but my question is this, how do I release the axels so I can change the bearings and seals on the inside??

Any answers are appreciated and thank you,

Brandon

msgross · 08-09-2007, 12:13 PM

There is a small bolt that is holding a large pin that goes through the carrier. Remove small bolt (usually parallel with axles), remove large pin (90 perpendicular to axles), push axles inward and remove C-clips that hold them in (inside carrier) then pull axles out. I suggest that you go to the store and buy a Chiltons manual for our trucks.

cdowns · 08-09-2007, 12:36 PM

or even better is the factory service manuals the all the vendors sell(reprints)its about the best money that can be spent when working on classic vehicles or actually any vehicles

smoky02 · 08-09-2007, 12:36 PM

TTT...thank you, but i know how to pulll the axels out of an open rear end

faribran · 08-09-2007, 12:56 PM

pic

Mt Man Chad · 08-09-2007, 01:20 PM

The center pin retaining bolt...

faribran · 08-09-2007, 02:07 PM

Chad,
we have made it this far.... (the bolt didnt break).. the large pin slid out fine...the axles slide inward.. the "C" clips want to fall out... but the springs are in the way..... need to know what the "Next" step is... plz.

Scott68-93-97 · 08-09-2007, 04:21 PM

The C clips should come out in your pics it looks like one side the springs are in tight and the other spread apart they should come out that side, I had a camaro rear axle in my old malibu had a similar posi and the clips only come out one side. My 97' truck is the same way, try using a magnet to keep them in the right position when your pullin them out.

Mt Man Chad · 08-09-2007, 04:25 PM

If the springs are the only thing holding you back form getting the axle clips out rotate the carrier 180 degrees. The back side of the carrier you should have access to the c clips on the end of the axles.

Once they are out, just slide the axles shafts out slowly so to not damage the axle bearings.

**uncle** · 08-09-2007, 04:27 PM

Sometimes you have to push in on the end of the axle in order to get the clips out.Get a magnet to help pull them out and to reinstall.

faribran · 08-09-2007, 04:44 PM

thanks guys.... hope to "dive into" it again tonite.... was hoping to be able to change the outer bearings and seals without the spider gears and spacers falling out....

msgross · 08-09-2007, 04:46 PM

That's an Eaton positrac rear end. i just did the same thing on mine. It comes out just like an open carrier but with a little less room. Mine also had shims behind the spider gears that fell out....be sure to get them back where they belong... That entire spring assy can come out but I wouldn't unless you need to. put a bolt through it to squeeze it tight and it will slide right out.

Thealien · 08-09-2007, 04:53 PM

Is there already a hole for the bolt in that spring pack? I need to remove mine to replace the posi clutches/steels.

msgross · 08-09-2007, 07:32 PM

The service manual shows putting bolts and nut through the springs to compress them... I'll have to pull it out again but pretty sure that's how they show how to service them.

08-09-2007, 11:57 AM	#1
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	changing seals and bearing in a 308 posi rear Ok, I have a 308 rear end, that's not a true posi, but it has the springs in it, so I know it's not just an open rear end, but my question is this, how do I release the axels so I can change the bearings and seals on the inside?? Any answers are appreciated and thank you, Brandon __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

08-09-2007, 12:13 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: changing seals and bearing in a 308 posi rear There is a small bolt that is holding a large pin that goes through the carrier. Remove small bolt (usually parallel with axles), remove large pin (90 perpendicular to axles), push axles inward and remove C-clips that hold them in (inside carrier) then pull axles out. I suggest that you go to the store and buy a Chiltons manual for our trucks. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

08-09-2007, 12:36 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: changing seals and bearing in a 308 posi rear or even better is the factory service manuals the all the vendors sell(reprints)its about the best money that can be spent when working on classic vehicles or actually any vehicles __________________ 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

08-09-2007, 12:36 PM	#4
smoky02 Registered User Join Date: Oct 2003 Location: Sunny, Florida, some might call it South Alabama Posts: 834	Re: changing seals and bearing in a 308 posi rear TTT...thank you, but i know how to pulll the axels out of an open rear end __________________ Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart.

08-09-2007, 12:56 PM	#5
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: changing seals and bearing in a 308 posi rear pic Attached Images __________________ "

08-09-2007, 01:20 PM	#6
Mt Man Chad Registered User Join Date: Oct 2006 Location: Oakridge Oregon Posts: 1,865	Re: changing seals and bearing in a 308 posi rear The center pin retaining bolt... Attached Images __________________ 68 CST SWB - Gold/White 50th anniversary /TH350/Buddy Buckets/3.73 Posi/dogdish caps. 68 K10 Burb - Gold/White 327/SM465/NP205/3.73 "Daa Burb" build thread

08-09-2007, 02:07 PM	#7
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: changing seals and bearing in a 308 posi rear Chad, we have made it this far.... (the bolt didnt break).. the large pin slid out fine...the axles slide inward.. the "C" clips want to fall out... but the springs are in the way..... need to know what the "Next" step is... plz. __________________ "

08-09-2007, 04:21 PM	#8
Scott68-93-97 Registered User Join Date: Jul 2006 Location: Fair Oaks, CA Posts: 475	Re: changing seals and bearing in a 308 posi rear The C clips should come out in your pics it looks like one side the springs are in tight and the other spread apart they should come out that side, I had a camaro rear axle in my old malibu had a similar posi and the clips only come out one side. My 97' truck is the same way, try using a magnet to keep them in the right position when your pullin them out. __________________ 1968 Short Fleet 350/700r4 http://67-72chevytrucks.com/vboard/s...d.php?t=249435 1997 Bagged XtdCab Vortec350/4L60e http://67-72chevytrucks.com/vboard/s...44#post2286144 1993 XtdCab Longbed 4x4 6.5Turbo/NV4500 "Daily Driver" 1985 Toyota XtdCab 4x4 22re/W-56/Dual T-cases, Doug Thorley Header, Homebrew front and rear spring packs, Tons of Mods to suspension and drivetrain, 35" boggers, coming soon ARB's and 5.29's, Possible 4.3/700r4 swap Last edited by Scott68-93-97; 08-09-2007 at 04:22 PM.

08-09-2007, 04:25 PM	#9
Mt Man Chad Registered User Join Date: Oct 2006 Location: Oakridge Oregon Posts: 1,865	Re: changing seals and bearing in a 308 posi rear If the springs are the only thing holding you back form getting the axle clips out rotate the carrier 180 degrees. The back side of the carrier you should have access to the c clips on the end of the axles. Once they are out, just slide the axles shafts out slowly so to not damage the axle bearings. __________________ 68 CST SWB - Gold/White 50th anniversary /TH350/Buddy Buckets/3.73 Posi/dogdish caps. 68 K10 Burb - Gold/White 327/SM465/NP205/3.73 "Daa Burb" build thread Last edited by Mt Man Chad; 08-09-2007 at 04:26 PM.

08-09-2007, 04:27 PM	#10
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,286	Re: changing seals and bearing in a 308 posi rear Sometimes you have to push in on the end of the axle in order to get the clips out.Get a magnet to help pull them out and to reinstall.

08-09-2007, 04:44 PM	#11
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: changing seals and bearing in a 308 posi rear thanks guys.... hope to "dive into" it again tonite.... was hoping to be able to change the outer bearings and seals without the spider gears and spacers falling out.... __________________ "

08-09-2007, 04:46 PM	#12
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: changing seals and bearing in a 308 posi rear That's an Eaton positrac rear end. i just did the same thing on mine. It comes out just like an open carrier but with a little less room. Mine also had shims behind the spider gears that fell out....be sure to get them back where they belong... That entire spring assy can come out but I wouldn't unless you need to. put a bolt through it to squeeze it tight and it will slide right out. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

08-09-2007, 04:53 PM	#13
Thealien Senior Member Join Date: Jun 2007 Location: Pine Ridge Florida Posts: 4,123	Re: changing seals and bearing in a 308 posi rear Is there already a hole for the bolt in that spring pack? I need to remove mine to replace the posi clutches/steels.

08-09-2007, 07:32 PM	#14
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: changing seals and bearing in a 308 posi rear The service manual shows putting bolts and nut through the springs to compress them... I'll have to pull it out again but pretty sure that's how they show how to service them. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"



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