Rearend Question. HELP!!!

[LEADFOOT]

I changed my rearend fluid today (63k miles and never been changed) and found this in there. Any one know what it is from? In one of the picks is a piece of metal looks like a spline tooth its about an inch long, and some pieces of metal. The thing in the top right is a twig, pay no attention to that. The other pics are of the cover. The magnet is covered in metal shavings. A lot of metal shavings!!!!!! Any ideas.

[OBI WAN]

Since its neve been changed before the shavings are normal to find stuck to the magnet. That piece though???? Could be a casting flash or lets hope it was and not a tooth top!

[LEADFOOT]

Since its neve been changed before the shavings are normal to find stuck to the magnet. That piece though???? Could be a casting flash or lets hope it was and not a tooth top!
It looks like a tooth top. Its round on the top and broken off something on the bottom. Put it this way all 3 sides are smooth but the fourth side is deffinetly broken off something. What about the little pieces, any idea on those.

[OBI WAN]

Little pieces that the big piece took out. I wouldnt worry too much since it does happen quite often, but if you begin to feel a clicking in the rear then its taking them all out one by one! You'd be suprised at how bad the damage can be and still go just fine forever!!

[Maximus]

Hell the old rear I took out of my S10 before I put the posi in had several teeth on the ring gear with chips missing.And it never made a click or clank or anything.I was suprised to find it like it was and not have had any problems out of it.Just give it hell as usual and if it's almost gone you will help it get there lmao!!

[bvr775]

I've seen worse go for for thousands of miles, but all the same start saving up for a new diff.
Look at it this way you upgrade the rear now and you don't have to worry when you drop a v8 in

[LEADFOOT]

I looked at it again and it does look like a tooth top. I ment to jack the truck up some more and spin it over to try and see where it came from, but I forgot. Then when I got the cover back on and started to put the oil back in I remebered but it was too late. 1 side goes to a point ( if you look at it from one end it looks like a triangle). On the end of one of the ends it looks like it is broken off of something but the other end is smooth. So you guys are saying it looks like the very end of a tooth off of one of the gears? Ok so atleast maximus found a bunch of them and didn't have any problems. I guess everything is ok and I don't need to panic. Oh yeah it is a little bent in the middle and where the bend is it looks like something about a 1/4 of an inch wide hit it right there and forced it to break off. I notice it when I wiped off where the gasket was and wiped out this little area and it fell out on the drain pan. I said oh s**t what the hell was that. Metal shouldn't be hitting the drain pan!!!!

[LEADFOOT]

Another question. Where do I find a 12 bolt to fit this Blazer. Will it bolt and go or will I have to modify stuff like perches and brake lines? The Blazer I have comes with disc brakes on the rear, I would like to keep it that way. Can I just put in a stronger ring an pinion and a strong locker or do I have to do the hole rearend?

[Maximus]

I would just try and find a late model unit with the same gears as your but with a limited slip locker in it.It will be plenty strong enough for your truck.

[LEADFOOT]

I was told before, by a friend of my dads that the 4WD Blazer has a posi. rearend. Is that what you are talking about. How about when I get the wynjammer and headers and then decide to take the wjammer to about 10psi. Will the rear handle the HP?

[bvr775]

strange has a direct fit for s-trucks. I'm assumming they will fit a t-truck too.
they'er not cheap. give um a call and see
http://www.strangeengineering.net/index.html

it's a good thing s-10s are considered hot rods now. It's a whole lot easyer now that you don't have to cross refernce 20 cars to find direct bolt-ons.

[Maximus]

No not all 4 wheel drives have a posi rearend.Look and see in your glove box if you have the RPO code G80.That is the code for a posi.Did you see a locker while you had the cover off.And yes with a little work the stock rear can handle a good amount of hp/tq.A 4x4 is wider by a couple of inches than a 2 wheel drive rearend.If anything look for a 8.5 10 bolt out of a 4 wheel drive S10 or Blazer.It is plenty strong emough to handle a supercharged 4.3.Look at SuperchargedZQ8's truck.He has been supercharged for awhile with the 8.5 10 bolt and he's not having any trouble.A 12 bolt would be great but for what you have planned the money would be better spent on other things.

[LEADFOOT]

I looked in the glove box and the sticker has G80 on it but it also G75 and lots of other letters w/numbers. Exactly where on the sticker do I look? When I called the dealer to find out how much it holds and if I need that special lube stuff, they said it was limited slip. On the road leading to my house I used to power brake it and get sideways also at the track. Then I put on new falken tires and trac bars and when I did it once at the track I only got 1wheel peel. I paid $400 bucks for these tires and they have to last so I haven't been roasting them like I did the other ones. I don't think it has a locker, but one would be nice.

[Supercharged-ZQ8]

I looked in the glove box and the sticker has G80 on it but it also G75 and lots of other letters w/numbers. Exactly where on the sticker do I look? When I called the dealer to find out how much it holds and if I need that special lube stuff, they said it was limited slip. On the road leading to my house I used to power brake it and get sideways also at the track. Then I put on new falken tires and trac bars and when I did it once at the track I only got 1wheel peel. I paid $400 bucks for these tires and they have to last so I haven't been roasting them like I did the other ones. I don't think it has a locker, but one would be nice.
If you've got "G80" listed in the glove box, then it IS a locking diff. The other numbers are various other options that the truck cam with. We've got a list of RPO codes here (http://www.sicgmtrucks.com/forum/showthread.php?t=702&highlight=codes), or you can type them in here (http://www.s10forum.com//rpo/).

But again, if you've got the G80 code listed, then you've got a locker.

[OBI WAN]

The 8.5 10 Bolt has the same strength as the old 10 Bolts found in the Camaro, Chevells etc, if that tells you anything. GM only really has one popular rear thats stronger and thats the 12 bolt. Your 8.5 10 bolt will handle more than you can through at it for some time. 500 H.p. and around 400 ft lbs of Torque before you tear it up.

[Supercharged-ZQ8]

The 8.5 10 Bolt has the same strength as the old 10 Bolts found in the Camaro, Chevells etc, if that tells you anything. GM only really has one popular rear thats stronger and thats the 12 bolt. Your 8.5 10 bolt will handle more than you can through at it for some time. 500 H.p. and around 400 ft lbs of Torque before you tear it up.
Yep -- that's pretty much the long and the short of it. The 8.5" will be able to handle just about anything these 4.3s can dish out.

[LEADFOOT]

So the power trax locker, is that also limited slip but locks up when under torque? I want something that will lock all the time when I spin the tires. I can leave a black mark from hear to china with one wheel peel, but two wheels smoking and leaving rubber looks better. Ok back to my original post with the pieces that I found in my diff. If this rearend is that strong then why do I have pieces breaking of of it? Its only a little piece but still it worries me a little.

[OBI WAN]

The only true posi rears are Spools and full locker rears. Spools you DONT want to run in the street an Full Lockers are controlled inside the cab by air and other means, but uses only for off road, straight line only etc and those types to look at them look at Detroit Lockers etc.
All others work as load slips, they lock, some better than others for doing such, some speed limited. If I was to chose and aftermarket to tear the street up on with 2 rubber marks, it be a Posi Lock type. These are geared and not clutched types that really lock her up good until not needed. Eaton and alot of the Aurburns are clutch arrangements and are speed sensitive and only as good at the pack is set up or worn too!!

[Maximus]

I would say yours is just starting to wear down is why you don't see two marks.If I was gonna buy a GOOD locker for the money and quality I would get this.There full lockers are to noisy but thses don't have that ratchet noise and they will hold a hell of a lot of power.
(http://www.powertrax.com/noslip.html) http://www.powertrax.com/noslip.html
(http://www.powertrax.com/noslip.html)

[LEADFOOT]

Yeah thats what I am talking about in my previous post. They have those at summit. They are like almost $400. So those are pretty good huh. Still limited slip so the tires don't get worn out too fast when driving around town? And then locks when under torque, right?

[LEADFOOT]

I wrote down all the codes on the sticker and looked them up. Thats pretty interesting. How old is that list. Some of my codes aren't on the list. Where can I go to find an updated list?

[OBI WAN]

That is the lasted list I could put my hands on!! I dont think there is a newer one of the S boards I know of anywhere since mine is even updated later. Give me the odd codes and let me see what I can do!

[LEADFOOT]

I will have to go back and figure out which codes aren't on there. I didn't mark them. I have the GU6 and the G75 code on my sticker. GU6 says 3.42 gears which is what the dealer told me when I called them awhile back. And G75 says something like 3.62 gears. Why do I have both of these on the rpo code sticker?

[LEADFOOT]

Here's the codes I have that don't show up on the list. AV0,AXP,B0Q,JC1,LIN,NF7,QQX,RSA,R8L,R9Z,XQX,YQX,ZC E,ZQ6,ZR6,1SY,1SZ,121,6AN,7AN. Thanx Jedi

[T Man]

I ran your codes and came up with this

AV0 SEAT , "FRT BKT, DRIVER, RECL, 8 WAY ADJUSTER, POWER"
AXP VIN IDENT , "POSITION, MULTI-PURPOSE VEHICLE"
B0Q VEHICLE GM , PROD WEEK 33
JC1 BRAKE , "VAC POWER, 4 WHL DISC, 5,500 LBS"
LIN PLANT CODE , "LINDEN, NJ, USA"
NF7 EMISSION SYSTEM , "FEDERAL, NLEV"
QQX TIRE ALL , P235/60R16 BW R/PE ST TL AL3
RSA RESTRAINT , "FRT SEAT, 208, AUTO, PASSIVE"
R8L CONTROL , SALES ITEM NO. 62
R9Z CONTROL , SALES ITEM NO.100
XQX TIRE FRONT , P235/60R16-99H BW R/PE ST TL AL3
YQX TIRE REAR , P235/60R16-99H BW R/PE ST TL AL3
ZCE TIRE SPARE , P205/75R15/N BL R/PE ST TL ALS
ZQ6 SALES PACKAGE , DRIVER CONVENIENCE III
ZR6 SHOW VEHICLE , ZONE
1SY PACKAGE , OPTION 23
1SZ DISCOUNT , OPTION PACKAGE
6AN COMPONENT FRT LH , COMPUTER SEL SUSP (6AN)
7AN COMPONENT FRT RH , COMPUTER SEL SUSP (7AN)

[T Man]

I looked up the 121 and got nothing, so I ran all the possible combinations using L,Z,1,I, and 2 thinking you had made an error in reading your writing. This is what I came up with:

12I INTERIOR TRIM , GRAPHITE (96)
12I INTERIOR TRIM , GRAPHITE II (99)
12I INTERIOR TRIM , EBONY (99) HOLDENS
1Z1 RUSTPROOFING , "OUTSIDE SOURCE, MEETS MIL STD 1223"
LZ1 ENGINE , "DIESEL, 8 CYL, 4.6L, V8, SOHC, ISUZU"
12L SECONDARY COLOR , "EXTERIOR, SILVER MET (95)"
12L SECONDARY COLOR , "EXTERIOR, LINEN WHITE (93)"
12L SECONDARY COLOR , "EXTERIOR, YELLOW WHITE (96)"
12L SECONDARY COLOR , "EXTERIOR, GALAXY SILVER MET (99)"
12L SECONDARY COLOR , "EXTERIOR, EVEREST WHITE (BRAZIL)"
12L SECONDARY COLOR , "EXTERIOR, SILVER MERCURY MET (BRAZIL)"
12L SECONDARY COLOR , "EXTERIOR, ARDEN BLUE MICA, OPEL (99)"
12L SECONDARY COLOR , "EXTERIOR, SILKY SILVER, (02), HOLDEN"

Id say most likely it is the rust proofing code.

As for the GU6, and the G75 code, here is what I found

GU6 AXLE REAR , 3.42 RATIO
G75 GVW RATING , "4,550 LBS"


Hope this helps

Tom

[OBI WAN]

Bet me too it!! Yup those be it!!

Ive found alot of times also that GM changes what a code means in mid stream due to this early release mid year crap also. SO a code at the begining of the year means this and the end means that. The problem with these code programs is to get one aint easy nor cheap for the most part so guys steal them from the parts counters computers and the problem with those is they are generic at times. Certian vehicles use the codes as stated while other divisions use the same code to mean something else. You really need the codes per each division and I havent found anybody to get those for me!! See dealers may sell Chevrolet, Pontiac, Buick, GMC or any other of the GM lineup from the same dealer. Even though is GM, they dont use the RPOs the same way 100%, at best around 90%!! That 10% can screw your *** up!!

[LEADFOOT]

Thanx Tom. The list says that the code G75 is 3.62 gear. Jedi should check this out. Maybe just a typing error. 121 code may be the 1Z1 code. I may have wrote the wrong number or letter. lol. Thanx again Tom.

[T Man]

no typing error on my part, all cut and paste. no sweat though, im bored

[OBI WAN]

G75 is a 3.62 code, this is the dilemia. ON one vehicle it means one thing depending on the other codes, one superedes the meaning of the other. In this case the G76 is a wieght code to go with the other axle code. But if the G75 was straight up and the only axle type code and they used one of the other weight codes, then its the axle.

See what I mean?? Thats the 10% rule!


http://www.drivetrain.com/GMtrkratio_posidata.html

[LEADFOOT]

Thanx to you too Jedi. I am not worried about the codes that aren't listed. I don't need them or anything I was just curious to what they meant. I never knew what all those numbers and letters were for. I sure am glad I stumbled upon the s10planet back in dec. because I sure have learned alot from this site. I call this place my CYBER HOME.

[Maximus]

Yeah thats what I am talking about in my previous post. They have those at summit. They are like almost $400. So those are pretty good huh. Still limited slip so the tires don't get worn out too fast when driving around town? And then locks when under torque, right?Yeah you got it.And they are so much easier to install than most limited slip units.I have a cousin who has one in his old Nova and when that thing locks it is LOCKED.Two very dark patches of rubber peel.My TA has a posi and sometimes in a straight line if the rear doesn't have a slight load on it,it will start with one tire peel and then in to 2 wheel peel.I don't think my stock unit is gonna handle to much more power.I wish GM would have made a 8.5 unit for a Fbody.Dam GM bean counters!!

[T Man]

hey max. if you want to get rid of your lim slip when you get a new one, provided that one isnt broken wanna talk about a possible sale?

[LEADFOOT]

no typing error on my part, all cut and paste. no sweat though, im bored
I didn't mean a typing error on your part I was saying maybe a typing that jedi made when putting up the list. I think I also wrote down the code wrong.

[T Man]

ohhh
ok i get it now

[Maximus]

When I do get the new rear for the TA you got first dibs on the stock unit.