Okay i need a posi/limited slip. i changed my gea fluid the other month and it said 13.42 on the ring gear (couldnt see what the pinion gear had). and so after posting it here it came to the conclusion i had 3.23 gears. now im lookin in jegs at the Auburn Gear Differentials. they have ones for 26splined axels and have for 3.23 gears and up and 3.08 gears and down.

my question is would i go with the one for 3.23 gears and up? becuz i get confused around this point. and which one would be better, there the regualer Gear Differentials for 329.99 and then theres the Pro series for 416.99?

which one would be more suitable for the track/street?

thanx guys


tim

 

TTT

 

You obviously need to go with the carrier for 3.23 and up. You also need to make sure you have 26 spline axles and not 28 spline. I think they went to 28 spline in either 88 or 89. I'd go with the pro series since it should be more durable and have heavier duty springs.

 

persoanly if i were going to pay full retail prices for a carrier, i would get the eaton posi.

 

Timz2882
I have an 82 z-28 also and I had the rearend rebuilt last summer, mine originally had 3.42 gears in it and it had no posi from the factory. I ordered a Thorsen posi unit from Reider Racing along with a new set of 3.73 gears and new 28spline moser axles and all new bearing and hardware kit. If you're like me you probably saying I never heard of Thorsen. I talked to a guy who trans-am races an 82 z-28 and he told me that he was constantly breaking posi units while racing. He still run the factory 10 bolt that came in the car and he said that this unit has not failed yet and it's been in the car dor sveral years now with no service to it. The guys at Reider Racing told me the factory 10 bolt will handle up to 450 horse if you are going drag racing every weekend. The nice thing about the Thorsen unit is it does not use discs or clutch packs, but rather a worm gear set up. It works very well thus far with no problems, and I can lay down some serious posi marks now. The fun factor is definitly there!!
Chet cc82z-28

 

well im pretty sure i have 26 spline axels considering this is an 82 rear end and im sure it hasnt been swapped with something else. right now im just planning on gettin a posi/limited slip before April 16th. im trying to get my car track ready. and im crossing things slowly off my list. i just dont have the money to spend to get brand new axels. ill probably see how much it will cost me to get the bearings replaced at the same time and also i planon gettin ARP wheel studds becuz im goin to be using weld pro star rims and i need a bigger stud. so when thats all out i can get it done but im on a tight budget, i get paid every 2weeks so things are tight.

 

Install a powertrax locker. Very streetable--mine has been on the street for over 6 years. To install, remove the spider gears and replace with the locker. The ring and pinion and carrier all stay in the diff. Something else to consider anyway.

 

Very easy install for the powertrax unit I put one in last month and am happy with it. Found out my car originally came with 3.08 gears and not the 2.73s like I thought it did. At any rate, I had swapped rear ends out 2 years ago for one with 3.42 gears in it and less noise lol.

 

I run the powertrax unit in my 12 bolt rear that's in my 69 Camaro and they're unbeatable for straight line traction. The only thing that's better is a genuine race spool setup. The only time I wouldn't suggest using one in a third gen though is if you do a lot of autocrossing or road racing where there's lots of corners as they tend to be a little jerky and rough sometimes when you take a sharp corner. A posi is a better bet in those situations because the slippage of the clutch discs is smoother than the indexing of the teeth on a locker unit. If your primary concern is all out straight line traction though, they're hard to beat for the price. Plus, the installation is a breeze since you don't have to disturb the ring and pinion settings. I installed mine in about an hour flat in my driveway. Just my .02 from personal experience.

 

DO NOT go with the pro series gears, they are softer and for race only. I've found www.reiderracing.com to be the best resource for gears and info.

 

Good point there blacksheep. I 've heard of guys trying to run those on the street and they wear out really quick. In fact, I've heard the factory gears are even harder than the richmond street/strip gears. Race gears are softer so they can take the impact of hard launches with slicks without fracturing the teeth.

 

well i proabably plan on goin with either a auburn posi (the cheaper one) or a powertrax. and then get some Richmound 3.73 gears. im goin to be using M&H roadmaster DOT slicks. i think ill go look around on jegs for the powertrax.

okay i looked at the powertrax locker and they show for 26 spline axels a 7.625 rear. would that be the same as the 7.5 and 7 5/8?

 

They're not the same. Take off the rear cover and look on the ring gear for the size that you have.

 

they only have the locker for a 7.625'' rear wit 26 spline axels. i have an 82 rear with 3.23 gears and is 7 5/8 = 7.625? becuz if tryin to get the locker is going to have to end up having to pull the cover again and changing the oil again, its not worth it

 

do they make a powertrax unit for the 9 bolt?

 

Okay this weekend (if my paycheck is enuff) ill be ordering the Auburn posi for like $329.99 i think it is and a set of 3.42 richmond gears. questions is, is the auburn posi good for the track from switchin from an open rear to the posi as like a good upgrade? and also will goin from stock 3.23 gears to 3.42 gears be a noticable improvment? i would love to go with 3.73 but this is my daily driver so i cant get to wild with gears yet

 

I have an 84 Trans Am with an open 3.73..i am very interested in the powertrax unit but i am concerned it will have a clicking noise going around turns.. is this rumor true?...

 

i have an early 89 iroc and i had 26 spline axles. so i swapped to a 97 z28 rear end. disc brakes, pbr,11.5" i think. posi allread in it. if i break it i will get the zexel for $100. and be good. it allready has 3.42 gears.

 

wyclefsirocz, how easy was that 97 coversion I have a 92 bird and might consider that

 

its justvas easy as to swap to another 3rd gen rear end
ur gonna get better disc brakes, better gears most likly if not the same. 3.23 or 3.42. i found a 3.42 posi rearend with discs on it for $450, the only problem is that i have the sportline springs in my car and i hae to put the stock springs back in for a little while because the rear end is a 1.5" longer on both side. and if u get a newer one it is 2" on both sides. the only problem is the e brake cables. but with a hammer and $10 that is easily fixed.

 

From the powertrax site:

Powertrax lock-right
7.625 28 spline part number 1931
7.625 26 spline part number 1932
7.5 26 spline part number 1930

Powertrax no-slip
7.625 26 spline part number 92-0776-2605
7.5 26 spline part number 92-0775-2605

I installed the lock-right locker back when they first came out. It has a light clicking when turning really short(parking lot or something). The no-slip system is an 'improved' design that eliminates the click with some syncronizers--100 bucks extra. I guess I've never seen the click as a bad thing. As for the 69 Camaro... are you running the stiff or soft springs in that powertrax? The stiffer springs don't allow it to unlock as easy. All the 7.5/7.625 powertrax lock-right lockers I've seen only come with the soft springs.

 

82 Camaro guessed it right on the nose! I am running the stiffer springs in the one in my 69. I also got mine right around when they first came out. It came with two sets of springs. I installed the heavier ones recommended for strip use since a quick lockup is more important to my application than easier disengagement. I don't really do any corner carving in the 69, it's much happier being nailed in a straight line! The only time it's really jerky is when I'm turning really sharp into a parking spot or making a tight u-turn. I've seen the newer no-slip units, but I didn't know they utilized synchronizer assemblies to make them smoother. If or when I burn up the posi in my third gen, maybe I'll pick up one of the synchronized units for that car. Either that or one of the zexel-torsen units from slp.

 

Ahhh theres the catch I knew there had to be one its wider! damn 2" is alot on both sides. thanx anyway

 

yeah its gonna suck s alil till i get some ZR1's

 

well i ordered my posi, i ordered the Auburn differental series (just the regular cheaper one). i figured i wasnt goin to be speedin don he drak strip everyweekend but mostly this is a daily driver car that see the track a few times a yr.