tells nothing but "about 2", per side". Google says the same thing. Does anybody know the ACTUAL width?

I know all about the "about 2" wider, per side" & using 2" adapters to put 4th gen wheels on a 3rd gen axle. And I hear the ACTUAL width, wheel mounting surface to wheel mounting surface, is closer to 1.5" per side. But since our rear tires sit in further, that would be why 2" adapters are usually used.

My problem is....

I'm thinking about putting a 4th gen axle under my GTA & keeping my 0 offset 17" Snypers. Changing the wheels is NOT AN OPTION.

So the question is......Does anybody know the ACTUAL width? I just need that #, to see where my Snypers would end up at, on a 4th gen axle, under my GTA.

Yes. I know I could just buy a kit to put 4th gen brakes on my 9-bolt axle. I might do that. But a full axle, is cheaper than just the brake kits.

So please again.....Does anybody know the ACTUAL axle width?

 

No personal experience, but check out the following link. The fist post makes mention of width.

https://www.thirdgen.org/forums/faq-...-gen-rear.html

JamesC

 

If you like I can measure my axle when I get home. Reply to this thread so I get a notification otherwise I'll forget. I forget stuff like this BAD. Where to where?

 

it is exactly 2 inches per side longer.
everything bolts up the same - just the width.
some run them without changing out anything and others use offsets to equal the 2 inches.
those that just run them find that there might be some scraping when going over bumps.

so the answer is 4 INCHES TOTAL.

just add that to what you have.

and you might be going to a 28 or 32 spline with the new rear end - yours is a 26 if its the original one.

and if you are really worried, put a 2 inch spacer on what you now have and see if you hit.

 

The spline count won't make any difference. Nothing from his 9bolt would swap over even if he wanted it to and he knows that.

Tony, do you have an actual measurement of the axle or are you like every other person on this board that's just going to regurgitate the same crap without actually having put your hands on a tape measure? Sorry if that comes off rude but Stephen asked for a real, honest-to-jebus, measurement of a 4thgen axle and you just told him what everyone else has said; what they think the difference is. Hell, you may be exactly right but it'd be easy to believe you with a width number.

 

looks its 2 inches. cant be any simpler. the issue is not a theoritical meausrment from the factory it's will his rims and tires fit.
dont leave that to measuring - if its that critical borrow a couple of spacers and see if it fits.
and it is important to always mention the spline etc incase they want to do a transfer over into the new rear end.
other than knowing its exactly 2 inches wider per side what do you want the measurement from?
the end of the stud, the outside of the disk break, what?
it does not matter unles he has the exactly width of his rear end to compare with - in which case all he has to do is
ADD 2 INCHES TO ANY POINT ON IT AND THAT IS WHAT IT WILL BE TO THE SAME POINT ON THE 4TH GEN!

and from flange face to face its 65 1/2 inches. is that info going to makre sure your tires fit or do you think a TWO INCH SPACER IS WHAT YoU NEED.

do you already know the length from flang to flange or is the next question what is the distance flange face to flange face on an 87. in which case

ADD TWO INCH SPACERS AND SEE IF IT FITS.

 

Yes, It could be simpler. If you provided an actual measurement. You know, if you had actual first hand experience with the differences between the two rear axles. The point of this post was so that he didn't have to borrow spacers or do guessing.

And it doesn't matter if he wanted to transfer anything over to the new rear end because, like I said, it wouldn't work. He has a 9bolt.

It wouldn't be hard to just pick a point and measure the width. Flange to flange, stud to stud, backing plate to backing plate. If you read I asked what point would be easiest to measure. Either way, you say EXACTLY 2". I just wanted to know whether that was from actually measuring, or just reiterated from other posts on TGO?

Like I've heard on other boards; Bring the tech.

 

The LS1 rear end I have is 64.5" across from the outer face of where each rim mounts to.



Edit: I would think that the rotors are going to add 1/4" to each side.

 

Yay! Let's spend $100 on spacers we might not need!

Is this an 93-97 rear or 98-02 rear? Would be interesting to see if there was truly a difference in those as well. I've heard hearsay that there is difference?

 

THAT IS WHY I WROTE 65 1/2 INCHES FLANGE FACE TO FLANGE FACE.
NOW DO YOU KNOW HOW MANY INCHES IT IS FLANGE FACE TO FLANGE FACE ON YOUR SPECIFIC CAR?
if you dont the information is worthless.

 

borrow some spacers - you have friends. go to a tire shop and ask them to do it for 20.00. they will even take the tires off and on for that.
no you should go out and buy a new rear end and then find out it does not fit.

 

Calm down, turbo. You edited that post a few times after I already started typing.

FYI, I'm not the original poster I couldn't care less either way. But actual on car measurements + year are infinitely more useable that 'oh it's 2 inches'.

How do you know my friends even have chevies? They could all drives mopars. No tire shop around here stocks 2" bolt on spacers. Could be different somewhere else but I've tried that route.

See, right off the bat, your info doesn't jive with Scorpner. Yours is a full inch wider. What year is your rear?

And no, I don't know how wide my axle is. I said in my first post I could measure when I get home. I'm at work. Reading comprehension?

 

This from the link I posted above:

The 93-97 4th gen rears are 3.8" wider from hub to hub so the stock thirdgen wheels will stick out some. A lot say that its even with the fender lip so its not all that bad. Some stick out abit past. the 98+ rears are abit shorter, at about 3.5 inches wide they say, but my measurements are showing more like a 3.125 inch difference. LS1 rear is about 64 3/4inch long and 9 bolt was 61 5/8.

JamesC

 

That's within a 1/4" of mine if the rotors are included. Good thread BTW.

 

WOW!

I ask for simple ACTUAL measurements.....
Point out that I want TRUTH, not the "2" wider" rabble.....
And people start arguing, quoting the old "truth" and still posting "what is known".....

JamesC.....Thanks for the link. I do have a habit of not always catching the details in long posts.

iansane.....If you can, that would be great. Wheel mount to wheel mount, not simply rotor to rotor, since the rotor isn't where a wheel sits. Along with what year it is from.

tony....You posted the same old "2" wider rule" that has gone around for years, but isn't 100% accurate. Just what people generally go by, to get adapters for 4th gen wheels. I even went so far as to point out I DO NOT WANT to hear the "2" rule", yet you posted it.....And no way I'm spending $ on a 2" adapter, that I'll never need. I run wheels that FIT & do not require 40 lug nuts. Splines are irrelevant, to axle width. Your # is about an inch off from what the link JamesC shows....And you are just spouting the same old, not giving a measurement.

Scorpner...THANK YOU. No bs'ing...No spouting old "facts". Just "Here's mine....."

It is sounding like the LS1 rear will be 2 3/4" wider, wheel mount to wheel mount, on top of the rotors. I look forward to seeing if iansane gets that, on his rear axle, if he has a LS1 rear axle.

I've often wondered if I should just to a junkyard, start measuring & take pics. Nobody coul argue with the pics.

 

I won't be able to give labratory exact measurements because my c6s are still on as well as rotors. But from the face of the rotor to face of rotor my LT1 axle is ~65 3/8" wide.

 

Thanks. Rotor face to wheel mounting surface would add what? 1/2"/5/8" per side?

It's looking like my Snypers would end up sitting out past the fender lip, a full 1". That is pretty much the max that I could be happy with.

Going from a 10.5" rotor/iron calipers, to a 12" rotor & the LS1 amulinum calipers, would be well worth the "stick out".

 

just raw measurements mean nothing. everything is off and when someone asks for the measurements he better ask from one specific point to another specific point. not just how long is it when the points to measure from change depending if you measure from outside of the flange face to outside of flange face or to the ourside of the disk, or housing to housing.
and he can come up with all the theory he wants - unless he can have someone at a wheen shop to stick on a couple of 2 inch spacers to see if he really has the clearance, he will never know for sure.
like i said - 20 bucks for a quick check is sure a lot better than buying a new rear end, all the gearing, and different disk breaks, just to find out your precious wheels are going to look like they have curb scrape on them from rubbing on the rear.
and if he is going to use 1 5/8 instead of 2 inches - he is cutting it way to close to not do a actual fitment check FIRST.
and so now he knows 65 1/2 from outside of flange face to outside of flange face, did he crawl under his car and measure outside of flange face to face so that the figures are useable?
and i would love to see a few pics of the car with 2 inch spacers on it to see if it really fits.
so the answer is 2 inches wider per side. it was 2 inches wider per side on the first post and after all this its still 2 inches wider per side on the last post.

 

Your lack of reading ability escapes me......

#1. I SPECIFIED, from wheel mounting surface to wheel mounting surface. Not even brake rotor edge to brake rotor edge.

#2. 65.5" is NOT accurate. As EVIDENCED by the PICTURE. Take your pic to show something different. Can't, can you?

(like most) are completely unusable & just serve to confuse most people. Your stuck on the "2" per side" crap, which is constantly regurgitated & completely inaccurate. Your posts in this thread are doing NOTHING to help me, nor anyone that reads it, in the future.

Please refrain from posting your useless dribble.
It is doing NO GOOD to help answer the question.

Please leave now.

 

your a pretty sharp guy - you know that two inches per side is 2 inches more than what you have.

as for looking as you said you did - i ran "width camaro axle" and in 0.34 seconds it came up with 10 pages of links to sites that give you all the data.

so take a breath - becasue im not impressed at you ability to google. hence - any advice you give.

so now we have that out of the way - lets just pretend we dont exist - you go your way and i will go mine and if we happen to meet on a board - well i know i wont see you.

have a wonderful day and be sure to let us see that curb rash on those wheels you love so much.

 

There you go again, with your 2" wider crap. Let's face it...That statement IS CRAP & 100% false, so it is USELESS! Quit lieing to everyone with that.

Google, if you read, which you obviously can't since you couldn't read my initial post, gives the same crap that is coming outta your fingers...2"...2"...2"....BULLSHIT!!!!!!!!!!!!

I can't pretend you don't exist. I have to watch out for you & correct your **** ups!

 

So why don't you measure your own 3rd gen axle and add the 4" to the numbers and area you want. Crawl under your car or is that too hard???

 

#1....It would be pointless to do. 4" wouldn't give the correct #, so it would be a complete waste of my time to do so. Obviously you are a victim of the mindless dribble that has been passed around for years. FOUR INCHES IS NOT CORRECT! Not only that (if you had read ANY before posting)...LT1 & LS1s rears are different widths.

#2.....Yes, it is hard for me to do.

I don't ask for anybody's sympathy. I don't want it, expect it, nor will I accept it. But there is a REASON "simple" things like getting under my car are NOT simple. Think before you speak.

 

Given your combative outbursts, in this thread and others, perhaps you should practice what you preach. I'm done. Rant away.

JamesC

 

Just for you James...I'll rant.

You keep spouting the 2" wider CRAP over & over, yet it IS NOT RIGHT! Why? It obviously not right. It's been PROVEN its not right. Its been proven that there are TWO different 4th gen axle widths, so obviously one # (2") can't be right both rears ends in any case.

You're stuck in the 2" wider loop.

 

Me? Silly, silly rabbit, check post #13.

JamesC

 

You know James....All you wanna do is fight & argue with me everywhere on TGO. I think you actually SEARCH for my posts, just to post yourself & get under my skin....

Where is that Ignore list.....

 

OK guys... Do we know what the exact measurment difference between the 3rd gen rear and the LS1 rear is yet?? Is it 3.125 as stated in a above post? I want to do this swap in my 91 Z28 and want to know as well.