my transmission just ate s***, and well something beast will be its replacement. currently the car has BFG Drag radials, 3.42 and a 100shot. after the new trans is installed, it will have all of that plus roller control, 2400 stall, window switch and a two step. from what i have found, the OEM rear end (9bolt) will not hold up to that sort of punishment. i plan on replacing that with a later model 3gen axle (swapping the 9bolt for the 10bolt). My question, is how much torque and HP can the 10 bolt hold, and what can i do to make it stronger? i would like to use the SLP O.E.M. Zexel-Torsen posi, there is a note on the website "NOTE: This is a 3-series differential" what is the difference between the series. ta boot they post the fact that these posi use a 28spline axle, how many splines do the later model 3gens have? if not 28 splines, what axles do i use. the 4 gens utilize a wider axle, correct? What is the Moser Rear(Ford)?

Junkyard Axle $??
Zexel posi $99.99
http://www.slponline.com/view_produc...TNUMBER=64501T
Spohn Lower Control Arms $175.00
http://www.spohn.net/index.cfm?fusea...ct&productid=6
LCA Relocation Brackets $65.00
http://www.spohn.net/index.cfm?fusea...t&productid=11
Rear End Girdles $155.00
http://www.fasttoys.net/8292fbodyframes.html

Correct me were i'm wrong the series refurring to the rear end denotes gear ratio in a greater or less than fashion. series2 3.08 or less, series3 is 3.08 higher. what else is the diffeance?

 

Ummmm... the 9 bolt is much stronger than the 10 bolt. I run a 9 bolt in my 500hp big block Camaro (1.72-1.75 60 ft) (more info on my car at www.koolmeister.com

For more info on 9 bolts, go to www.9bolt.com

Miles
Diff Solutions
www.9bolt.com

 

yep you'd be taking a giant step backwards going to a 10 bolt

 

i just bought the car back in 12/13/02 so i am still learning about things. the nine bolt is stronger then the 10 bolt, just to make sure we are talking about the same nine bolt.

1985 Camaro Z28 Iroc
305 TPI 700R4 GU6(3.42)

So this means i have a beaster then ten bolt rear end, and a great gear ratio. now with this rear end being numerically larger then 3.08 would make this a series 3 axle, there for i can put the Zexel posi right in to my rear end. Unless the amount of splines are different, does the nine bolt have 28 splines? also where can i go to find stronger axles, and who makes high quality u-joints

Thanks 88 427 Camaro and ede , you have saved me time, money and from a huge mistake

 

Are you sure you have a 9 bolt? You mention the "oem rear" and state 3.42 gearing..3.42s are 10 bolt gears, 3.45s are the 9 bolt gears. Also, you can't put a SLP Z/T in a 9 bolt.

Am I misunderstanding this?

Ed

 

ebmiller88-
like i said, i just bought the car back in 12/13/02, so i have trying to learn as much about this is i can. i don’t have much time to be doing reach on the internet, so i go by what people tell me and to find supporting information on the internet. if what i say is wrong, sorry but that’s why i am asking question, to correct myself were i am wrong, see what other people have done and learn as much about this car in the shortest possible time.



What year did the 9 bolt come in the Camaro?
What was all the optional gear ratio for the 9 bolt?

 

I'm not bustin your stones, bro, I'm just trying to figure this out so I (we) can help you save $$$ and spend it where it most helps you.

To the best of my knowlege, the 9 bolts were used from '85-'89, then GM went to 10 bolts only '90 and up. The gear ratios were 2.77, 3.08, 3.27, and 3.45. The 3.45s were in the V6ers and the 3.27s were the optional upgrades for the V8s. My Iroc with the 350/A4 got the 2.77 rear.

Someone jump in here and help if I'm not totally right.

HTH, and welcome to the boards. There's a lot of good info to learn on here...

Ed

 

ok, so if the 9 bolts were used in 85-89 and only have optional gear ratios of 2.77, 3.08, 3.27, and 3.45 how do i have a GU6 rear axle option? that came right of the rpo code list in the center consol. what did gm use before the 9bolt and is the any markings on the axle itself that will denote what the hell it is? are the inspection plates of the 9 and 10 bolt axles the same?

Thanks for the help ebmiller88

 

The only thing I can figure is that the 9 bolt is NOT the original rear. The 9 bolt was the performance axle for Irocs and Z28s, and GM used 10 bolts everywhere else...except Firehawks, they (all??) got Dana 44s.

Ed

 

my friend, who owned this car prior was the one that said it had the 9bolt, he is usually right about matters like this. the car was owned by some GM executive, then owned by this other guy who rebuilt the suspension, next was my friend and now me. it's pretty stock, not much was touched. this car has just about every option that was avaible right down to the gold 16" wheels. so maybe it is the 10 bolt and i was wrong from the get go? as i was asking before, are there any outside markings that will distinguish the 9bolt from the 10bolt? is there any rpo code that will tell me if it has a 9bolt?

 

count the number of bolts on the differential cover.

9=9 Bolt
10=10 Bolt

also the 9 bolt has a rubber filler plug right on the diff cover.
the 10 bolt doesn't.

 

i thought that amount of bolts referred to the amount of bolts around the ring gear, not the cover, or is this coincidence. i know my diff cover doesn't have a rubber plug, but a metal bolt on the carrier for the fill. with the 3.42gears and a fill bolt v. a fill plug i guess i have a series 3 10bolt. not to discount what you have just stated mystikkal_69, but can anyone else verify that the 9bolt has rubber fill plug.
ebmiller are you sure that the 9bolt only came with 2.77, 3.08, 3.27, and 3.45? if you check the post that 88 427 Camaro made www.9bolt.com, hotrod magazine did an article on the 85 T/A (l69) ws6 w/5speed that had a 9bolt w/ 3.73.

 

Those are aftermarket ratios that he supplies, check the website for others.

 

i am almost one hundred percent sure that i have the 10bolt rear end now. after checking out the FAQs on www.9bolt.com, the 9bolt came with 3.45 not 3.42 and came with disc brakes (more likely) not drum like on my car. thank you for all your help 88 427 Camaro, ede, ebmiller88 and mystikkal_69. that is enough information to go on, i think the only way to put this one to rest is to count the bolts on the ring gear.

but i would like to know where i could get some new 28 spline axles