I don't understand why this item is only $99: http://www.slponline.com/view_produc...&SHOWEMAIL=Off Would this possibly fit in a 85 camaro V6 3.42 rearend?? What would I need to make it fit? I think I have 26 spline axles in this 85 rearend, so where/how woudl I get 28 spline axles? thanx

Well you will have to convert to 28spline axles and a quick search will tell you how to do it. ALso, since it is a 3 series carrier you will need 3 series gears. No big deal and both will bolt into your rear (pending you do the axle swap).

Now as for the catch, there isn't any. Technically these are used items that came off SS's and WS6's in slp's factory when someone ordered the Auburn unit. The cars literally go across the street form GM to SLP where they turned them into SS's and WS6's. So, if the car was optioned for the Auburn unit they pulled the GM unit out (usually less than 2 miles on them). However, since they have that 2 miles on them they are a used peice and cannot be sold as new. Not to mention they are making a profit off of them. So no catch and the buyers gain!!

Wait I don't get it...I thought 3 series gears were any gears that were 3.08 or above......so my 3.42's in this V6 rearend are NOT 3 series gears and I will have to buy different gears???

he was just stating what is needed for the unit to work.

yes anything 3.08 and down is 2 series, 3.23 up 3 series and the slp posi needs 28 spline axles.

Would this work on my 92RS since it has a 28 spline? Rear ends are not my cup of tea but would like to replace my open rear to limited slip with a higher gear than what it has now. What would you suggest?

Incorrect information....

The WS6's came with the zexel torsen unit, it was the camaro SS's and Firehawks that got the upgraded auburn posi.

Yes you are absolutley correct: It was the firehawks and not the WS6's that got the auburn. That was fast typing on my part and I goofed. I always see the SS's and WS6's as equals when in fact it is the firehawks that are the optioned equals to the SS. Good catch!

This is not always true. There are some 3.XX gears that are for a 2 series carrier. Any T5 car witht he 3.08'2 have a 2 series carrier. That is why I got the 3.42's and ditched the 3.08's. The stock gears aren't that bad for a T5 305. It is the lack of posi that kills you. And when you go with that posi you need to upgrade to a 3 series carrier.

When did GM switch from 26 spline to 28 spline? I have a 89 2.73 open rear. I might just go ahead and buy the torsen before they run out for later purposes

Lots of misinformation all in this post...

GM switched from 26- to 28-spline axles during the 89 model year. It wasn't an instantaneous switchober though; they apparently ran all 26s for some part of production, then replaced different ratio and option combos with 28s as they ran out of 26s. Seems like from what I've seen people post on this board, about 80% of all 89s, especially the 2.73 and 3.08 ones, got the 26-spline ones. The change wasn't complete until 90 production.

The reason the SLP take-out posi is so cheap is because .... it's a take-out. It's not new. It's a used stock part taken out of the cars that they were turning into SSs. They used Auburn up until 97, according to Auburn (I haven't spoken to SLP about it), and then switched from using the Auburn Pro in the SSs and Firehawks to a heavier-duty Zexel unit. GM also used an Auburn clutch-type posi up until about the same time. So, for years, when you bought the SLP take-out, it was an Auburn; then starting in 98 or so, they started selling the used (very slightly used, like 14 miles or whatever, but used just the same) stock Zexel.

In this model of rear end, the dividing line between 2-series and 3-series carriers is between 3.08 and 3.23. 3.08 and down are 2-series, 3.23 and up are 3-series. Here's a massive parts listing that should vlear that up. http://www.drivetrainspecialists.com...=28&cat=GM+7.5

full of brain farts, yeah 3.08 and lower 2 series

By this time SLP should be running out of this $99 special Limited Slip.

Get em while their hot .

I guess if I do have 26 spline axles, I could always go to the junk yard and pull some out of a 90-92 car right? I just pop the wheel off and pull the axle out?

I had an 89 2.73 rear and was convinced it was 28 spline until I checked. It turned out to be the crappy old 26 spline axles. Like the other guys have pointed out, most of the 89 units still have the old axles. I just figure 90 and up have the 28 spline as a good rule of thumb these days.

You could also just look into getting a whole 4th gen rear end. Everything will be installed and have a posi with 3.42's or 3.23's. You also get disck brakes and the whole thing may be cheaper than buying a posi, gears, and having everything converted and installed. $300 may be well spent on a used rear for your situation.

Md, you didn't brain fart--you got it right. Shifty misquoted you! So no need to be slapping yourself in the head, lol.

Oh, nm. I'll guess that your editting of your post came after Shifty's, lol.

yea i was alittle dissapointed with finding out my car had 26 splines in the original rear end....and the car was produced in june of 89!!! (the last month of 89 production)

I also have a few question?. Are the used ones for $100 the same as the new ones for $400? Also, why does the used one require an installation kit? And finally, is anything required in addition for either of the two? thanks

No. the used one the standard unit, the $400 is the heavy-duty one, that SLP put into those cars to replace the ones that they took out and are now selling for $99.

You don't really need a whole "kit" if you buy one of those; but you will need the 2 carrier bearings. They're not real careful with them, and they're usually narfed by the time they arrive.

You'll need some fluid.

<sigh>

In 1998, a (heavy duty???) Torsen was an SLP option. The Auburn type posi was standard.

In 1999-2002, a Torsen was standard (this is the one they sell as a take-out) and a h.d. Auburn was an SLP option.

i talked to a tech guy at SLP and he said "for me" the auburn differential would be the best because ill be running my 400 with a standard and with the clutch type differential itll help take the preload off of the rest of the drivetrain????? so what really would be the best? because i originally wanted to know if i should buy the heavy duty unit they sell for $400 bucks...... and he said the auburn style was $500

At 400hp I dunno, I know the clutch types are usually better but clutches can wear out and I don't think its necessary to get that, it may be overkill, but im no expert on it. Sounds to me like he was just trying to sell you something more expensive, not sure if they get commision or anything.

Damn, I don't know about you guys, but the difference between $99 and $400 kinda MAKES the decision for me Thats too much money when an entire 4th gen rearend with disc brakes posi and 3.42's can be had all day long for around $350 in phoenix.

well im thinking about going with a 9 bolt rear, itll probably be all ill need, ill just make sure i dont run too sticky of tires and get some extra insurance on it.

I was going to suggest Superior 28 spline axles avail at Summit for $275/pair, but some junk yard axles will do if your on a tight budget.

Your not going to be using the Torsen for 1/4 mi passes on slicks are you?

Check out Reider Racing, they have the Torsen units and everything you need to put it in your car. My 82 Z-28 had an open differential with 3.42 grs, I went to the Torsen unit which was 169.00 new 3.73 gears, new Moser axles and the installation kit so that everything was new except the housing. The rearend can take alot of abuse for 71/2 unit. Hope this helps.

okay i'm confused. I have an 89 with 2.73, and i want 3.73 with posi do buy a 2 or 3 series setup?

You need a 3 series. But you need to make sur eyou have the 28 spline axels if you have an 89.

I thought 4th gen rears are wider than 3rd gen rears?...therfore you would need wheel off sets..right?

yeah, they are about 4 inches wider.

Yup, they are 2 inches wider per side. You will have to run 4th gen wheels or any wheels with the same specs.

so if the 4th gen rears are wider by a total of 4 inches wouldnt the axles them selves be to wide to use on the third gen rear, or am i wrong on this one, i ask because in a few weeks i plan on doing this or at least getting all the parts for it and i want to get the right stuff first off, thanks

Yes the axles are wider also as is the housing. The differential and gears are interchangeable between 3rd and 4th gen, but the axles and housing is different.

What gears would be in an '84 305 Z28 5 speed?

also, an 89 RS V6? I can get either one of those pretty cheap. Which would be better?

what gear ratio is in both? posi or no?

its got 3.23 rear end gears if its a lg4 (non h.o.) and 3.73 rear end gears if its got the high out put motor in it

and the 89 rs is gonna have 3.42 gears if it has a v6 init regaurdless of tranny

i dont know about posi my guess is no on both
if the Z28 has the ho motor get its gears man.

to find out if car has posi look for rpo code of g80, can any one else confim this so we know this is right

Whichever?........will I be able to use either one with the posi unit that is in my car now but 2.73's?

Also when I go to check how do I tell if the gears are in good condition? broken teeth and stuff or do I need to look for something else?

Ok let me get this straight, my 92 bird HAS a 28 spline axle that is the same 28 spline found on the 4th gen. The SLP 4th gen 28spline is a posi unit with a 3.42 ratio and will fit into my 92. I need new bearings with the SLP, are those just gm over counter parts that will direct fit for my 3rd gen rear. Do I also need that gear for my trans to make the mph correct, where would I get one?

Yes, all yo need for th eSLP posi is bearings; you don't have to get them at GM, you can get them from dozens of places for less. They're the same for A & B & G bodies, S trucks, vans, as well as both 3rd and 4th gen F cars.

Yes you'd need the right speedo gears for whatever gear and tire size and transmission you have. Those do have to come from GM.

i have a quick question:

i have an 89 trans am.

2.73's

i have 3.42's waitign to be installed. i have a 2 series carrier i'm guessings 28 spline axles. i need a ring spacer for the 3.42's to work with my 2 series carrier correct? if i have the ring spacer, 3..42's, and the posi unit...it will all work? thanks guys.


edit: also on that site it says you need to replace the bearing. why? what will happen if you don't?