8"rearend to posi?

tfish · 11-17-2001, 08:50 PM

Whta are some of the ways to make our 8" ford rearend into a posi rearend? We would like to keep the stock rearend in the mustang if possible.
Tony and AJ

jwboner · 11-18-2001, 12:09 AM

Finding those 8" chunks is getting harder and more expensive. Which is one main reason I went up to the 9". The easiest way to switch from open to posi is to purchase a complete chunk and bolt it in. You could get just a posi carrier and transplant your gears onto it but it is very difficult if you aren't familiar with doing it. I understand that you want to keep you rear original but some mustangs came with the 9" (K codes). It will be much stronger, easier to find parts, and many more options available, and the prices are about the same for posi units. Down sides to 9" is they are heavier and have a little more drag. A lot would depend on your hp level is.

smokedchevy · 11-18-2001, 02:53 AM

You should be able to find an 8" posi carrier somewhere. One with new internals should cost about $550-$600 for the whole pumpkin. Posi units are about $350 without installation. It'll cost $100 for a new bearing kit plus about $150 for labor. I just shoved a spool in mine and slapped the slicks on. Terrible for the street though.

David Fulford · 11-19-2001, 06:10 PM

Jegs sells a posi unti for an 8". And currie sells a complete posi 3rd member but I think they are a little pricy. They are supposedly very well built though. Good luck

diablopony · 11-24-2001, 05:36 PM

I went the Currie 3rd member route with 3:25 TSD. Couldn't be happier with it. I tach about 3K on the freeway at 70 mph and it is a lot quicker off a stop light. The whole thing with shipping and mounting kit was about $900.

Downside is that I go through back tires pretty quick. Hard to keep my foot out of it with the posi.

Dark Knight · 11-27-2001, 02:06 PM

look for some truck wrecking yards, some of the older pick ups have 8in posi...

11-17-2001, 08:50 PM	#1
tfish Registered Member Join Date: Nov 2001 Location: Santa Rosa CA Posts: 35	8"rearend to posi? Whta are some of the ways to make our 8" ford rearend into a posi rearend? We would like to keep the stock rearend in the mustang if possible. Tony and AJ

11-18-2001, 12:09 AM	#2
jwboner Registered Member Join Date: Jun 2001 Location: Under the hood Posts: 164	Finding those 8" chunks is getting harder and more expensive. Which is one main reason I went up to the 9". The easiest way to switch from open to posi is to purchase a complete chunk and bolt it in. You could get just a posi carrier and transplant your gears onto it but it is very difficult if you aren't familiar with doing it. I understand that you want to keep you rear original but some mustangs came with the 9" (K codes). It will be much stronger, easier to find parts, and many more options available, and the prices are about the same for posi units. Down sides to 9" is they are heavier and have a little more drag. A lot would depend on your hp level is. __________________ 65 fastback 347 DFI injected w/vic jr, TFS heads, MSD, cable clutch TKO, 3.70 9", tc subframe conns, custom traction bars, griffen alum radiator, armored fuel cell, and torq thrust D's Retrofitted Prelude seats. Vintage Air underdash kit. Fiberglass here and there too More on the way all the time.

11-18-2001, 02:53 AM	#3
smokedchevy Registered Member Join Date: Jun 2000 Location: ventura,CA Posts: 438	You should be able to find an 8" posi carrier somewhere. One with new internals should cost about $550-$600 for the whole pumpkin. Posi units are about $350 without installation. It'll cost $100 for a new bearing kit plus about $150 for labor. I just shoved a spool in mine and slapped the slicks on. Terrible for the street though. __________________ 92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters 65 Mustang 13.50 107mph 3000' ALt. 65 Falcon Straight Axle Drag Car

11-19-2001, 06:10 PM	#4
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	Jegs sells a posi unti for an 8". And currie sells a complete posi 3rd member but I think they are a little pricy. They are supposedly very well built though. Good luck __________________ 1969 fast back; yellow; weld wheels; 302 roller with GT-40 heads; 3:55 gears; 5spd T-5; MSD 6AL; E-303; flows; Hedman headers; Holley 600;Weiand Accelerator;1.6 rockers

11-24-2001, 05:36 PM	#5
diablopony Registered Member Join Date: Jan 2001 Location: Clayton, CA USA Posts: 116	I went the Currie 3rd member route with 3:25 TSD. Couldn't be happier with it. I tach about 3K on the freeway at 70 mph and it is a lot quicker off a stop light. The whole thing with shipping and mounting kit was about $900. Downside is that I go through back tires pretty quick. Hard to keep my foot out of it with the posi. __________________ '68 convert, 5.0 GT-40 Crate motor, C-4, Tri-Y headers, 3.25 rear gears

11-27-2001, 02:06 PM	#6
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	look for some truck wrecking yards, some of the older pick ups have 8in posi... __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
New to board, 8" posi swap question	JChalfan	Classic Mustangs	2	01-31-2003 11:30 PM
Auburn posi ???'s...please help	dragstang86	Windsor Power	6	10-08-2002 05:52 PM
Getting Posi?????????? Help	98GtPower	Stang Stories	6	08-24-2002 01:59 PM
eaton posi/ baer claw problems	DirtKing	Windsor Power	3	04-28-2002 11:04 AM
New Auburn Posi, noise when turning	bark3rd	Modular Madness	7	11-07-2001 05:17 PM