branz28

It's a 12bolt that was on a truck, the guy got it from a junk yard, so i don't know what it originally goes to. It has 3.08's now and i -think- he said a open rear and drums... for $150, i going to go look at it sometime next week.
Couple of questions, will my disk brakes work on it? How much would it cost to put posi and 3.73? Where do i get the gear for my speed-o? (cable driven?) good investment? I want to get it so i have something for the stroker motor i'm planning..

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Problems every other day with the car (probably not a mod, but to me it sure makes a difference)

Biochem

I am pretty sure it won't bolt up because the shock mounts are in different places. I cannot say if it is the right length or not either. As for tranny gear for the speedo... check the equations page on the main page.

I believe (but could be wrong) that 10-bolt brakes and posi units will not fit in there right, check Jegs or Summit for posi differentials and gears for their prices. It really isn't that hard to do...

------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

Superman

If your going to do that swap your looking at alot of money and time. You have to weld spring perches on the rear end for the coil springs to set in, weld brackets on to hook up the LCA's, weld brackets on for the torque arm and move the shock brackets. The gears will cost you a $150, $200-$300 to have them setup and another $300-$400 for a good posi. I'm npt sure about the width of the rear end, if it will work under a third gen or not.

AlkyIROC

It won't work because of all the fabrication involved. It's also too wide.

The hardest part about installing all the mounting hardware is figuring out how to mount the torque arm.

I'd say walk away from the "deal". A truck 12 bolt isn't the same as a car 12 bolt. They use different ring and pinions.

------------------
Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

branz28

In that case, what kinda rear end would you all say to use? any good ones (i gotta have my posi, it's been my best friend in some hard times traction wise)

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Problems every other day with the car (probably not a mod, but to me it sure makes a difference)

Biochem

89... do you have a 10-bolt? If so, then you also have the 28-spline axles and you could just get a SLP posi for about $99 and get the 3.73 gears too. Also, go with a rear end girdle for about $135 from Summit or SLP (I think they sell them too). If you can, get the axle tubes welded to the housing and it is about as strong as a 10-bolt can be. Look up Dan Burke's article in the tech articles section.

You can get a 12-bolt or a Ford 9" for 3rd gens from Strange or Moser I believe. They run about $2K and are direct fits. Those are the strongest.

A BW 9-bolt is pretty damn strong too, but parts are $$$ and rare to find sometimes.

------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

ede

moser engineering in portland indiana makes 9 inch ford rear for a third gen.

------------------
ICON Motorsports
1st & 3rd