POSI REAR-END |
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brickard
New Member Joined: 17-October-2013 Location: Honesdale, PA Status: Offline Points: 37 |
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Posted: 27-January-2014 at 2:13PM |
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I'm sure there is a thread here somewhere, but I haven't found it....
Has anyone added a posi rear-end to their 74-76 Gran Torino? Any suggestions? Thanks, Brian
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1976 Gran Torino "Charlotte" (S&H Replica)
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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is it possible? yes. details, i'm not sure. are you just wanting to add a posi unit to your existing 3rd member? nice thing about 9" rearends is you pull the axles and the whole 3rd member comes out the front as a unit. it would be a good idea to know your gear ratio before checking into parts (as there may or may not be a difference in the unit)
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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Positraction is really GM's trademark name for their Limited Slip Differential. Just putting that out there although we all know what you are talking about so no big deal. Ford's version of the limited slip dif was called the Traction-Lok.
As far as swapping in an original ford limited slip unit for an open one, it's pretty straight forward. You can find plenty of "how to" videos on youtube for the ford building the Ford 9". Really all you actually need is it the differential and maybe the carrier gasket because that will probably get torn up upon dis-assembly. If you like your gearing then most likely all that can be reused. As far as the differential goes it's probably best to just go the the aftermarket for that. Ford's OEM limited slip unit has some minor shortcomings so most folks just get a similar aftermarket clutch type dif or even a helical gear dif. I'd do some research online. Options are plentiful, it will always come down the what your existing setup looks like, your knowledge, and the budget. Let us know what you end up doing. Always great to even out that rear tire tread .
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-Billy Conturo
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robot9000
Senior Member Joined: 02-September-2011 Location: Michigan Status: Offline Points: 505 |
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Planning on the same thing. There are several trac lock diffs on the market and all go in the $450 range (Summit has one for 1/2 the price. Not taking the chance....
Local guy says he can upgrade mine for the same price, so I may go that route this spring. Cool rumble from the headers kinda loses its WoW factor when you leave one black line..
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1973 Gran Torino Sport
2010 Mazda 6 2007 Jeep Wrangler 2011 Damon Daybreak 35BD |
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brickard
New Member Joined: 17-October-2013 Location: Honesdale, PA Status: Offline Points: 37 |
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Precisely my point! Thanks everyone. Brian
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1976 Gran Torino "Charlotte" (S&H Replica)
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Regul8r
Admin Group Moderator Joined: 26-December-2007 Location: Sarasota FL Status: Offline Points: 6624 |
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YUP! And add that there are huge/wide 295's that only ONE spins... YUCK! I am looking to do the same
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Carl Corey (Moderator/Event Coordinator) Contact ANYTIME!
1976 Ford Elite "Lola Mae" 97 Suzuki Intruder 1400 US Army Retired |
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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I would pick up an extra differential center-section and build it and then swap it in. Little to no down-time. If you aren't changing the gear ratio in the center-section, it's a simple install.
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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brickard
New Member Joined: 17-October-2013 Location: Honesdale, PA Status: Offline Points: 37 |
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Thanks again, everyone.
One more question....does anyone know offhand what size rear-end the 76 Gran Torino has? Is it the 9"?
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1976 Gran Torino "Charlotte" (S&H Replica)
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robot9000
Senior Member Joined: 02-September-2011 Location: Michigan Status: Offline Points: 505 |
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You almost certainly have a 9 inch. 8.8 didn't start until the 80's I think.
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1973 Gran Torino Sport
2010 Mazda 6 2007 Jeep Wrangler 2011 Damon Daybreak 35BD |
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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Ya, 9" with 28 spline and big bearings in the housing would be the norm for you
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-Billy Conturo
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robot9000
Senior Member Joined: 02-September-2011 Location: Michigan Status: Offline Points: 505 |
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Billy is right about the bearings. In fact, many catalogs, when describing rear disk kits for a 9 inch, often refer to the two sizes as regular and large (torino) bearings.
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1973 Gran Torino Sport
2010 Mazda 6 2007 Jeep Wrangler 2011 Damon Daybreak 35BD |
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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ya, I got the small bearing in my 72. After 72, Ford went to a larger bearing housing. In the larger bearing housing there is a straight bearing similar to the small bearing just bigger and there is a taper bearing of the same dimensions. The taper is where it's at. I think the axles are slightly different on the bearing end but I can't remember. I have it all out in the garage and I got a few pages of notes so I can check.
I actually had to pull apart at least 5 rear axles to start to see what was going on. I couldn't get definitive information on any of the 9" stuff. A Ford 9", who would have thought finding solid info on years, bearing sizes, flange sizes, and all the other details would be so hard. Everyone and their moms has a Ford 9 in at least one of their hot rods. stock 9s I've ripped down.. 65 T-bird 72 Torino 73 Ranchero 79 Mark and 1 Unknown I'm to the point where I am about to start scrapping center sections. Like I said the 79 was the gold: taper bearings ford limited slip disk brake bearing retainers super clean axle housing Took Ford 7 years to figure it out in the intermediates I guess
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-Billy Conturo
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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it's not easy getting the axle seal for that small 72 housing, from his listings Napa counter jockey brought out a large seal, luckily I had the original with me, marked D1ZX yada yada yada
D1ZX is 1971 Mustang bada bing I just recently grabbed a lightly used retro-fit Detroit style locker for mine Edited by Rockatansky - 30-January-2014 at 5:22PM |
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72 GT Ute
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bata747-8
Moderator Group Honorary Spam Bot / Zombie Account Joined: 24-June-2010 Location: China Status: Offline Points: 131 |
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So the 79 Mark V axle will fit into a Torino with no modification? Meaning the u-joint connection and the length is all correct? Also the disc brakes, has anyone tried to use those?
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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The U-joint is different. It's a 4 bolt flange setup but the pinion can easily be swapped with almost any 9" pinion.
The chassis is the same on the 72-79 Lincoln marks but with different wheel base. The mid frame is just a different length. So yes, the axle will just bolt right in. An issue for most is the 5 on 5" bolt pattern. I'm sure with some clever parts matching the discs could work with 5 on 4.5" axles. I just found some 5 on 5 wheels that are way better than what I have now so that's not a huge deal for me. Plus I can use one of the Lincolns aluminum wheels as a spare, that way I don't have to lug around a heavy steel spare. Another issue with disc brakes is finding a caliper that supports popular pads in different compounds. Luckily Porterfield makes a couple of compounds for both the stock front calipers and Lincoln rear brakes. Anyways.. getting off topic here... going back the limited slip. The limited slip would in theory just swap right into my 72 if I really wanted to do it. And whats with the spam bot account? |
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-Billy Conturo
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robot9000
Senior Member Joined: 02-September-2011 Location: Michigan Status: Offline Points: 505 |
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One issue I have always had with the parts mixing is if you sell the car, that info tends to get lost. You put on a set of SSB or Wilwood and there is no question on whats on there.
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1973 Gran Torino Sport
2010 Mazda 6 2007 Jeep Wrangler 2011 Damon Daybreak 35BD |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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Stacey David you tube Edited by Rockatansky - 01-February-2014 at 3:49PM |
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72 GT Ute
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bata747-8
Moderator Group Honorary Spam Bot / Zombie Account Joined: 24-June-2010 Location: China Status: Offline Points: 131 |
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A test account I have that was actually one of those pesky Chinese spam bots. My iPad is logged into this one, hence it posts from this when I am on my iPad. |
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GranTorinoSport
Admin Group Admin of "The Org" Joined: 20-May-2003 Location: Seattle Status: Offline Points: 2287 |
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And then when I am on my Macbook, I am using my main account.
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Scott Eklund
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72torino...
Member Joined: 12-June-2017 Location: Ohio Status: Offline Points: 130 |
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Minorly high jacking this. Will a Ford 9 inch from a 73 Torino be identical to a 72 Torino. In terms of suspension mounting?
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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the complete housing & carrier should swap no problem, except for the rusted bolts
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72 GT Ute
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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yes
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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