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Insane Network Engineer
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Discussion Starter · #1 ·
Well I got the new rear end in! I had wanted disc brakes for a long time, I came across a good deal on a g80 (limited slip posi) rear w/ disc brakes from a 99 blazer. It only had 33k on the rear and I got it for $180.00 bux! YAY.... So I finally get around to installing it this weekend with the help of Grappler...(Thanx once again bud)...

The install is fairly straight forward: (see notes at the end of this page): So I started by picking up the rear at my local wrecking yard. It's been sitting in mud for almost a year (the back end of the blazer it was on had no wheels and it's a messy yard)...

Here is the rear...As you can see there is a lot of surface rust...



Fortunatly the emergency brake shoes were in good shape as seen here...


Grappler taking a break before the installation... (see ending notes)



The dust shields were toast (rusted and bent) so I pulled the diff cover, then the axels and put new ones on.. In this pic you can see on the left side how bad they were banged up... on the right side I had already removed the dust shield...I also took the opprotunity to change the diff fluid... Sprayed out the casing with 2 cans of brake clean, let dry, then added Valvoline Durablend (dino/synthetic mix) 80/90 weight gear oil.



I used a wire wheel on an air rotary tool to get any scaling and debri (i.e mud) off of the casing. I then used a spray on rust inhibitor/converter/primer and let it sit overnight. (actually a couple of days because I couldn't get back to it). I then put on 2 coats of Rustolium Black w/ hammered finish on to it. This gives the benifit of being less rusty later on (gads I hate salt) and it actually looks good. I may do my whole frame in the stuff.

Here's a pic of it when it was half painted. You can see on the right the finished product while on the left it's still bare. Definatly an improvement.



I then cleaned up the calipers. Ground out the dirt and grease on the calipers themselves (aluminum, not iron, very light weight!) then cleaned and painted the actual caliper frame in the same color as I painted the rear itself.

In this pic I had test fitted the newly cut rotors and the calipers.... They came out very well...



rear side...



Once the new rear was finally ready for installation we of course had to pull the old one... This was simply a matter of diconnecting the vent hose, brake line T, emergency brake lines, u-bolts, drive shaft. Remember when you pull the u-joint, run some tape around both the end caps so they don't fall off when manuervering the shaft around.


Then we jacked it up and slid it out lengthwise....

My baby don't got back...



Here is the old rear in all it's glory (and salt)



Installtion is the same as extraction, just in reverse....

Grappler taking a break before the installation...



Without Caliper but with caliper frame: Note.. I took the opprotunity to install red polyeurethayne bushings on my swaybar to replace the OEM 10 year old rubber bushings....



With full caliper installed.


Angle 2


Finally when you've reattached all your brake lines, simply bleed all the air out of the calipers and lines. Test drive, enjoy!!!!



Some notes and conclusions:

Overall this is not a difficult swap. If I had been less concerned about the type of rear I was getting (g80) there is actually an easier way to do this. The above will work on 84 to current... This will also work... If you want to add OEM stock disc brakes to your EXISTING drum rear without changing the whole rear you would only need the following....

All 98 and up parts (these will work all the way down to 86)

Backing plates (27.00 per side )
Calipers (30.00)
Caliper frames (20.00)
Pads ($20.00)
Discs (36.00 per side at advance auto parts)
OR a loaded caliper from Advance autoparts (includes frame, pads, calipers, bolts, et-al)
Stock bolts
Dust shields (12.00 per side at the dealer)
Brake lines to the caliper...($15.00 each)

Simply remove your old shoes and the backing plates, install the new backing plates then the calipers, etc... Bleed and go...


EMERGENCY BRAKE INSTALLATION..

From the center of the body you will see a bracket where your pedal cable and your ebrake cables. From the bracket to the backing plates, those 2 cables will need to be replaced ($23.00 per side at the dealer) as the drum style has different ends and won't work with the new setup.. (This is only for 95 to current, 94 and below have a completely different cabling system so you would have to figure out on your own on how to go about making the ebrake work)



Definatly better stopping power than with my drums, the overall upgrade was well worth it. Overall time was about 4 hours (this included breaks and what not)
 

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Its that dam ADD!
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4,742 Posts
great man, that lt1 needs to slow down faster, thanks
I need to go pillage soem yards for a g80 soon , like before I start attaching the 4 link
 

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Got SuperRam?
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91 Posts
gezz, whos that lazy bum helpin you?! need to get him off his fat arse and get some work done! now if only the swap went as easily as this write up did!
 

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Insane Network Engineer
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Discussion Starter · #4 ·
Grappler said:
gezz, whos that lazy bum helpin you?! need to get him off his fat arse and get some work done! now if only the swap went as easily as this write up did!

All told it was fairly easy (with the exception of the razor blade in your shoulder...and me whacking you in the head with the jack handle! And I keep wanting to work on your swaps dammit!
 

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Got SuperRam?
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91 Posts
swaps? im not doing no stinking swaps. :lol: just need a job i get paid the same at and work less.. so i can get my bills paid and get out to clean the garage and get some decent progress done on them.
yeah the razor blade did suck!
 

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Insane Network Engineer
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5,965 Posts
Discussion Starter · #6 ·
Grappler said:
swaps? im not doing no stinking swaps. :lol: just need a job i get paid the same at and work less.. so i can get my bills paid and get out to clean the garage and get some decent progress done on them.
yeah the razor blade did suck!

Become a male prostitute...:) Cmon, afterall you love to whore yourself for parts!!! :rotf: :rotf: :rotf: :p
 

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Got SuperRam?
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91 Posts
ill remember that the next time you need to work out of my garage.. who the whore is for what..
 

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Insane Network Engineer
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5,965 Posts
Discussion Starter · #8 ·
Grappler said:
ill remember that the next time you need to work out of my garage.. who the whore is for what..

:rotf: :rotf: :rotf: :rotf: I'll just send "you know who" to move in with you...

But let me say, for the record, I have always appreciated any help you've given me, be it advice or physical help...

k, back to the cracks...:D giggidy giggidy giggidy
 

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It WAS a Blazer
96 manual transfer case 4x4 5 speed 2dr Chevy Blazer, 02 push button 4x4 Automatic 2dr Chevy Blazer
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645 Posts
I Guess I'll give this a try. I need to get the truck on the road again. I guess I get any axle w/ drums and just swap my discs equipment over to it.
 

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God I hate you guys
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170 Posts
I think the 2wd rears are 2" shorter than a 4wd rear, other than that 2wd ones are the same.
 

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Insane Network Engineer
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5,965 Posts
Discussion Starter · #18 ·
Chris H. said:
off hand do u guys know if the rear like the one u picked up is the same length as one under a pickup? I am looking to swap my rear out of my 98 pickup for a g80 rear with discs out of a blazer.....

Thanks
Chris
If your moving from a 4x4 s10 to blazer or vice versa they're the same length, same for the 2wd to 2wd 4x4 length is longer and the mounting points are different...
 

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It WAS a Blazer
96 manual transfer case 4x4 5 speed 2dr Chevy Blazer, 02 push button 4x4 Automatic 2dr Chevy Blazer
Joined
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645 Posts
Chris H. said:
off hand do u guys know if the rear like the one u picked up is the same length as one under a pickup? I am looking to swap my rear out of my 98 pickup for a g80 rear with discs out of a blazer.....

Thanks
Chris
Also if U are lucky enuf to get a 8.5 rear outta a Blazer the rear is about an inch longer where it attaches to the driveshaft. So U will need a shorter drive shaft, or get yours shortened.
 

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God I hate you guys
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170 Posts
Why is this not a sticky? I will be doing this soon, thanks rlith, your how tos have helped me with a few things. Do you need brake lines from a 98+ or will the 94-97 brake lines work?
 
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