I have the 9 bolt in my car w/posi and disks, yet no makes gears for it that I know of. I know they gears for the 10 bolt, but I don't want to loose my posi and rear disks.

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Rob
'86 TA 305 TPI

 

Yes, there are 10-bolts with posi and disks. I have one sitting in my garage right now (no, it's not for sale). They were available in 84 with the same crap brakes your 9-bolt has, and in 91 & 92 cars with the PBR calipers.

Your 9-bolt's posi carrier won't swap into a 10-bolt. The brakes might possibly, however, I don't know about that. The best thing though would be to keep your eyes open for the late-model style.

A 4th gen rear will bolt right in also, except that their length is greater, so you have to use wheels with a different offset.

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

 

Victor Li did the swap one way or the other putting disks from a 9 or 10 bolt to a 10 or 9 bolt (you know what i mean smartass.) IIRC he hated the swap.
If your idea was to get a junkyard 10 bolt and put your disks on it, that will work (see above) but you would need to get gears and a posi if it didn't have one.
...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
305 A4 2.73 - stock, soon to be sleeper

 

What I am looking to do is find a 10 bolt posi with disks, so I could buy a set of 3.73 gears to swap into it, then directly bolt into my car.

About this 4gen rear though, what kind of carrier is it (ie..strong for stock)? Do they come with 3.73's, posi, and disk? Is it a straight bolt in (ie..torque arm same, mounting holes for lca's and panhard rod same, springs in same location)? I can deal with getting new rims. Upgrading to 17" may be nice too.

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Rob
'86 TA 305 TPI

 

The 4th gen 10-bolt is identical internally to the later (28-spline axle) 3rd gen. I don;t know whether you would consider that strong or not, that's really a judgement call. They're available with posi and disks of course; I don't know about 3.73s but kind of doubt you'll find any, you might have to handle that part yourself. They are a direct bolt-in, exccept that they are about 2" longer on each end, thereby requiring wheels with negative offset to keep from making the tires stick way out past the fenders and looking like some typical rice-burning grocery cart conversion.

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

[This message has been edited by RB83L69 (edited January 03, 2001).]

 

Rice burning grocery cart conversion. I love that one!!!

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Rob
'86 TA 305 TPI

 

Well actually my 87iroc has a 4thgen rear end. I have spacers for the front and some 2k t/a rims for it but for the time being it has some crappy 82 15x7 t/a rims on it now and the way the back wheels stick out now they actually don't look half bad but i agree with what has been said above.
You would definatly have the ***** grocery getting appeal with anything above 15x7 thirdgen rim wise that is.

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1987 IROC-Z L98 350 SuperRam, Edelbrock Performer 6085 Aluminum Heads, LPE RollerCam 219/219, Crane Gold Race 1.6RR, TF 1 pc Chrome Moly Pushrods, Underdrive Pulleys, Edelbrock TPI High Flow Base Manifold, Accel 58mm TB, ADS 24#, Crane AFPR, K&N, Edelbrock TES Headers, Catco Hi Flow Cat, 3" Borla Cat-Back, Accel Cap & Rotor, MSD 8.5mm, MSD 6AL Ignition, MSD Blaster 2 Ignition Coil, Hayes Clutch, 1LE Aluminum DS, 94' Z28 Disk Rear, Wilwood Adjustable Proportioning Valve, Torsen Series 3 Posi Carrier, Precision 3.73 Gears, Southside Machine Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

 

rb, i have a 10 bolt posi disk rear too, only in my shed. i didn't think i'd ever see anyone else say they had one laying around, i thought i was the only one

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ICON Motorsports
1st & 3rd

 

Hopefully it won't be laying around too much longer!! The one in my car right now is about to start spitting its teeth out.

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

 

I swapped my 91 ten-bolt for an 89 nine-bolt. No I'm not crazy. The 10-bolt disc brakes went right on the 9-bolt, because they were both PBR calipers. 4th gen rear ends are 2.73, 3.23 (automatic), or 3.42 (all sticks) only.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Hey R.O.B. I saw one on Ebay just yesterday I think it had posi but Iam sure it had disk brakes and 3.23 gears

 

ROB if you want 3.73 gears I know a place that will make 3.70 gears for your 9 bolt. Its reider racing. Phone # 1-800-356-1330. I think they sell them for $299. Its cheaper and eaiser than finding a 10 bolt posi with disc's. 3.70's are very close to 3.73's that you won't know the difference.

 

I just discovered that TPIS also sell them in 3.73 gears for the 9 bolt. Although theres cost $495, yet it comes with an install kit.

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Rob
'86 TA 305 TPI

 

Most 1983 & 1984 Z28's and Trans Ams with the L69 engine option came with 4-wheel discs and a 3.73 ratio limited slip differential, in case you didn't know.

4-wheel disc equipped 10 bolts have been available in every year of third-gen with possible exception to 1989 models. The best configurations are found on 1989-1992 applications with the PBR calipers.

See: http://www.isthq.com/~dan/10bolt.html
and see: http://www.isthq.com/~dan/1LEbrake.html

You can reuse your PBR calipers if you buy the proper bracket for a 1989-up application, by the way. I upgraded my original 1984 housing to 1991 calipers & rotors, as well as adding a 1999 SLP Firehawk sourced Torsen differential and Moser 28 spline axles. Works like a charm!


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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.