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Open Carrier? Limited Slip? How do you tell

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer_Boy, Feb 12, 2001.

  1. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I'm looking at some 12 bolts in through my uncle's truck graveyard and was wondering how does one go about figuring out if its limited slip or an open carrier. One truck doesn't have the sticker in the glove compartment and the other well, there's no body so I guess forget that sticker. Can you just spin the driveshaft or tire and see what happens to find out? Thank You [​IMG]

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  2. ftn96

    ftn96 1/2 ton status

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    Ok, the open carrier, providing that you pull the covers off, will have 4 gears inside the carrier. 2 big ones and 2 small ones, then there will be a chrome or polished looking pin going thru the center.

    The limited slip, will look very close to that, but with what looks like 2 plates with a bunch of springs between them pushing out towards the gears that are on each side, being the axles gears. The limited slip will look very "full" so to speak and the open will be very open, with hardly anything in it.

    Will work for beer, parts and tools.
    90 Jimi,350/700R4/241/10bolts/4.10's/33's/4"
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  3. Mud Bath

    Mud Bath Registered Member

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    Jack up both rear tires and try to turn one of them. if it turns it is open, if not it is a limited slip
     
  4. ftn96

    ftn96 1/2 ton status

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    turning one tire one way and if the other one turns in the other direction, its open. If they both turn in the same direction its a limited.

    Will work for beer, parts and tools.
    90 Jimi,350/700R4/241/10bolts/4.10's/33's/4"
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  5. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The Gov-Lock (factory limited slip) will behave just like an open diff if both tires are jacked up off the ground and one is spun, as in one tire will spin one way and the other will spin in the opposite direction. The best way is to pull the covers off and take a look.
     
  6. Executioner

    Executioner 1/2 ton status

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    No, You have to pull the cover to be sure, I know its the hardest thing you will do, but that's just the way it is.
    Good luck
     
  7. ftn96

    ftn96 1/2 ton status

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    Oh, I agree. He needs to get in there anyway to make sure the guts are all good. So he don't find out his rear end is like mine was. When I got my Blazer I went through everything I could afford at the time. I took the rear cover off to see what was going on, damn it was a sad site. The spiders were flopping around like dead fish and the pin, LOL!!! was even worse, it had wollowed out the hole in the carrier. Needles to say that turned out to be the most expensive inspection I've done.

    Will work for beer, parts and tools.
    90 Jimi,350/700R4/241/10bolts/4.10's/33's/4"
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  8. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Yeah I gotta open 'em when I get out there to see whats all up. When I spun the one axles I turned the drum around one complete revolution and the yoke moved around 1 3/4 complete revolutions. The funny thing was though that the other drum didn't do a thing. It just sat there and when i moved it was hard to turn but then the other side didnt move but the yoke still did (the other side was probably hard to move because there was no tire on it for me to turn).

    I wanna see the story one this other truck we've got, its a 1977 Chevy Bonanza. I've never seen one in my life before. It has 8 leaves on the rear springs but it has a 12-bolt. It looks kinda fancy, auto tranny, 350, A/C. Maybe I'll get lucky and it will have a good 3.73 rear (only 2 wheel drive). Also, what kinda gear oil should I get. I'm in Iowa where during the winter it can get below 0 and sometimes over 100 in the summer.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Since the other wheel wasn't spinning, then multiply the 1-3/4 by 2. So 1.75x2=3.5. You'll need to get a better reading to guess at what's in there. That number seems dangerously close to 3.42. [​IMG]

    I use synthetic lube in my diffs. Mobil 1 makes it, as do others. You need good seals though or it will leak out everywhere. If you use a clutch-type LSD, you want to make sure the lube is compatible. Some of the synthetics are too slippery for the clutches to work. I've read that they can make worm-gear LSD's like the TrueTrac and the Gleason Torsen not work properly as well. I've got a Detroit Locker so it isn't a problem. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  10. 90K5

    90K5 1/2 ton status

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    Hey Blazer Boy-the truck you looked at was probably a Big 10. I think they were basically a 1/2 ton truck with 3/4 ton springs. I think Chevy made them to get around using cats and other emissions junk on them. Someone also could have swapped out the springs in the last 24 years.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  11. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I wonder what the story is on a Bonanza. I've seen replacement embelms available in LMC, but thats it. I'd like to get the emblems off of it. I want to get all the truck desigination emblems from 73-80 and mount them on a piece of finished wood and hang 'em up. I think it would look pretty cool in the house, in a red neck kinda way, lol

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  12. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    YEEEEE HAWWWW!
    I finally put down the crack pipe and thought back with a little more insight (no i do not actually smoke crack). I turned the thing one complete revolution or 360 degrees (yoke movement). Then second time ended up 45 degress shy of a full turn, 315 total or 7/8 and 1 7/8 times 2 is the 3.73 ratio. I'm so happy I could do the dance of joy. Now hopefully if i open it I'll be right ratio and the thing won't have puked it cookies already.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  13. HarryH3

    HarryH3 1 ton status Author

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    Most excellent! Congrats on your find! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  14. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    As long as half the posts on the thread are mine, why not one more. What do recommend to clean the insides out because I'm sure they're pretty nasty. I thought I read something about brake cleaner in the article about steve's gear swap.

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  15. ftn96

    ftn96 1/2 ton status

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    Bingo!!! But get the cheapest kind. Works great...

    Will work for beer, parts and tools.
    90 Jimi,350/700R4/241/10bolts/4.10's/33's/4"
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  16. HarryH3

    HarryH3 1 ton status Author

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    When I took my 14-bolt apart to rebuild it, I used lots of degreaser, soap and water. I found some sort of dishwashing gadget that had a handle and a bundle of foam rubber cleaning fingers on the end, shaped like a ball. I ran that through the axle tubes to get them totally clean. Of course, I had it stripped down to a bare housing when I did this. I also sanded and painted the whole housing. When I dropped it off to have the new ring and pinion set up the guy asked me if it was a brand new housing! [​IMG]

    If you're just going to open the cover and clean it out, then a couple of cans of brake cleaner will take off ALL the old oil. Just don't breathe the fumes. That stuff is nasty! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  17. ftn96

    ftn96 1/2 ton status

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    LOL!!! I thought it smelled pretty good. sniff sniff. My dog din't like it at all.

    Will work for beer, parts and tools.
    90 Jimi,350/700R4/241/10bolts/4.10's/33's/4"
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     

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