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Old 09-23-2001, 07:02 PM   #1
80Supreme455

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Post S10 Posi units

I read on some previous posts about this. I searched through and could not find them. I already have 3.73 gears in my 7.5, so I just need the diff. I believe that I read that the 4WD's had these. I was curious what years to look for, or any ways to identify the proper rearend without removing the cover. I've spotted a couple of 4WD S10 blazers in the late 80's.

Any help would be greatly appriciated.

Thanks in advance

Darin
 
Old 09-24-2001, 06:15 AM   #2
RAVEN

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The S-10,S-15, s-10 blazer, jimmy, astrovan, from '83 up has the 7.5 10 bolt rear, 4wd and 2wd. If you are looking for a posi diff. a lot of the automatics with a 2.8 or 4.3 had a posi diff. This is just what I have found most of the posi rears in. If someone hasn't removed it, there is usualy a metal tag on the rearend cover held on with one of the cover bolts to ID the rear as a limited slip. You can also check the option code list (inside glove box on s-10's....) for the G80 code for posi.
 
Old 09-24-2001, 07:43 AM   #3
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Up until 87,the 7.5 rear used 26 spline axles. anything newer than 87 will work,but you must get the axles along with the posi and gears. The newer ones are beefier axles,having 28 splines,but they can be a little bit more expensive.
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Old 09-24-2001, 11:54 AM   #4
RAVEN

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oops, forgot to add that. Good catch GBodyFreak.
 
Old 09-25-2001, 09:11 PM   #5
Chris Somers

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My buddy's supreme no rust '84 4x4 S-10 from Oregon has 3.73's. His pinion just took a permanent vacation and he found an '85 S-10 Blazer with one. I found one for my '79 shiv wagon(330 olds engine) back when I was in high school. It was an open diff though. Traded a Lokar shifter for it. It lasted for a while until one fateful night in California. Spider gears munched one night when I needed a dose of power before going to bed for the night. Result... Several miles walking with a pocket T shirt on 42 degrees, a pack of smokes, and one ice cold coke a cola. An Auburn limited slip fixed everything though. I switch to 3.42 gears at that point. I knew i would be driving across-country soon...
 
Old 05-21-2003, 05:08 PM   #6
rocket86

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Will the rearend components from the 88 and up work in an 86 housing? I would like to get the beefier axles for my cutlass. I am planning on putting a 3.73 or 4.11 posi out of an s10 or a blazer in my cutlass. I would like to get the carrier, gears, and axles and install in my 86 cutlasss supreme. I can buy the whole rear from any car in one of the salvage yards here in Baton Rouge. They dont know one from the other. I bought a rallye pac for 20 bucks like new a few weeks ago. All rear ends are 100 bucks. I have to pull it but I have some experience with the 7.5 so I know what not to do now. I have heard that the 88 and up stuff wont work on the 86 housing. The salvage yard has plenty of both and if the newer ones are compatible I would like one of those. Any help would be appreciated.
 
Old 05-21-2003, 06:24 PM   #7
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Wow, you revived a pretty old post there..

Im not sure if the cutlass and s-10 use the same length axles, but if they did, and you grabbed the 28 spline spider gears it should work. Just be careful when pulling your axles from the tubes. You dont want to tear a seal.

Thats about all im qualified to answer.. Maybe some of the other guys can help..
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Old 05-22-2003, 10:11 AM   #8
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I thought up until '88 the axles 26 splined axles were used. Can someone verify?
 
Old 05-22-2003, 10:17 AM   #9
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Sorry, i shoulda been more clear. anything older than 88 will be 26 spline, as are our cars. Anything after 88 will be 28 spline.
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Old 05-22-2003, 07:48 PM   #10
81D88

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what will fit my '81 Delta88. its kindof embaressing when i got to the track and im only spinning one wheel. and it may help with the pickup on my 5000 pound beast.
 
Old 05-24-2003, 10:31 AM   #11
GotDelta?

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Hey Man!

I've got a Delta 88 Too! You should be able to use a diff from an S10 older than 1987. Most of them have posi and good gears, and I'm planning on doing the same thing to my delta sometime in the near future.

Any, a delta88 won't weigh 5000 lbs. More like 4000, maybe more, maybe less. But defenitley not 5000!
 
Old 05-24-2003, 12:25 PM   #12
81D88

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well, according to the door sticker it weight 4910, but i have a big system in it, so its about 5000
 
Old 05-24-2003, 03:40 PM   #13
GotDelta?

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no no, I think thats the weight with the max passenger weight added to it.
 
Old 05-25-2003, 11:26 PM   #14
bigdoug

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for the delta alot of wagons had 10 bolt covers but had a 12 bolt ring gear. Not much if anything available just look for a wagon with the tow package you will get 3.23 or 3.08 posi. I am not talking gbody wagons but the full size ones
 
Old 05-26-2003, 08:22 AM   #15
GotDelta?

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Thats fine as long as he's willing to swap the differentials. B-body wagons and b-body sedan's have a different rear frame, making the mounts for the control arms wider.

So, a wagon rear won't fit a sedan.

I think an S10 diff swap is the way to go.
 
 


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