I need to know quick what year was the year they switched to 28 splin axels in the 3rdgen's..... i think its 88, but i have found a bunch of 87 rears... i need to know quick.

Steve

 

As far as i know 88 was a mixed year(some got 26,some 28) but 89 and up all got 28 splines.

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1982 Z28:355,4 Speed,Lots of bolt ons

 

ok thanx.. i'll keep looking, all the junkyards around say 90-92 are the same, and that there is a difference between the disk brake and the drum brake ones???

Steve

 

I'm pretty sure disk and drum axles are the same

 

i seriously cant figuer out why gm would make a different axel for only 5000 or so cars.....

anwyays, i will pull the axel tonight, and try to match one up tomorow

Steve

 

anybody got anything more about the axels??

 

All 9-bolts are 28 spline.

1990 models is what I hear for 28 splines in 10-bolts. Several 89 owners on this board have said their 10-bolts have 26 splines. The only way to know for sure is to pull and axle and count. But I'd be 99% sure an 87 10-bolt rear is 26 spline.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

I hear that the lugnut stud flange might be thicker or thinner between drum & disc axleshafts; don't know of any truth to it though.


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

The axle flange outer diameter is not particulary accurately controlled on drum brake rear ends. Some of them are too large to go inside the disk rotor.

Like others have said, 89 was the changeover year, but apparently they had a stash of them that took quite a while to exhaust; so it was sometime into 90 production before they were finally all 28 splines. 87 would definitely be 26 spline like Kevin says.

9-bot axles are completely different from 10-bolt ones. Any similarity in details such as spline count is purely coincidental.

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"So many Mustangs, so little time..."
ICON Motorsports

 

ahh yes i see... hmmm

well i knew the 9 bolt axels are diff... theyhave the bearing pressed on if i remember correctly...

guess i will contiue to look, if anyone has any, lemme know asap!

ssoares01@snet.net

Steve

 

You can just order a set of aftermarket 28 spline axles for $125 each. They'll fit drum and disk and be much better than a factory 28 spline.

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Follow my racing progress on Stephen's racing page
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87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

well with the limited budjet i have, thats gonna have to be another time.. i followed a link but i just dont have the money...

Steve

 

I have changed the passsenger side axle on my 88' 9-Bolt BW Rear End. I put in a drum type axle and it was 28 spline. Well the bearing has to pressed in. 9 bolt parts cost significantly more so be prepared. Second the axle flange diameter on the drum type is larger and will not fit disc. I learned the hard way. Well what i ended up doing is grinding down the outer diameter as evenly as possible until the disc fit as it should. Well if your axle has been bent for some reason or another your caliper backing plate has also been damaged. I know mine was thanks to a heads up Headpulper gave me. What i did is use a sledge hammer to straighten the plate as best i could. It has been working since. No odd vibratrions or anything. I will eventually swap the rear for a 10 bolt but i was in your postion with limited funds. Hope this helps you save some headaches.

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88' IROC-Z, 350 TPI, 700-R4

 

Ok, well here is what i have found to be bad on my 92' 10 bolt thus far, the backing plate IS bent, no biggy, i will straighten that out. Wheel is bent, and i wouldn't trust a cast alluminum wheel that has taken a hit anyways, the axle is definately bent, and i will be checking the rear for straightness tonight/tommorow nite. i am hoping the pan hardbar did not banana the rear when the side force was applied... if not, i will have to remove the rear end and striaghten it (no biggy, just a lot of time and welding)

anyways, the drum brake axles i will just pick one up, and have it machined.... i can get to a mchine shop and he'll just let me do it... as for the wheel, i might just have found a place to pick on up.

thanx for the good help guys, i'll let ya know what i find about the axles.. i am gonna bring all the hurt stuff to compare to the new stuff when i go to the yards today.

Steve

 

Bent Panhard bar is quite common in these situations. It's about a 5 minute job to replace it (as long as the hardware isn't all rusted together!), it unbolts with 2 bolts, you should just get another one (fairly cheap new, almost free used) rather than trying to heal the curbed one.

Other than that, sounds like you're on your way...

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"So many Mustangs, so little time..."
ICON Motorsports

 

well besides trying to find an axle... i found a set, but they wont seperate them from the housing...

Steve