Limited slip differential |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Posted: 09-December-2018 at 11:25AM |
I am guessing my 9' rear end has a 31 spline. Can some one please help me figure out what rear end I have. 73 gran Torino
Mark |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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I plan to install a new limited slip diff
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aquartlow
Senior Member Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2270 |
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If it still has a tag AND the rear assembly is basically untouched, this link may help with the 28 vs 31 spline question: http://www.fordification.com/tech/rearends_ford01.htm
It is still best to open it up to verify what you have, may have had a few "mods" since it left the factory. Hope this helps.
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www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone. |
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qcode72
Member Joined: 18-October-2013 Location: greenville,pa Status: Offline Points: 68 |
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Look for a tag on front of diff,or pull an axle then count spines.
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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if it still has the tag, it probably hasn't been messed with as most people don't bother to put it back on more than likely it has a 28 spline, pull an axle an count them, then you'll know. also is it a 9"? not an 8"??? ( 8" has a curved rear housing) 9" is curved but with an expanded section in the rear for the bigger ring gear to fit
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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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fordpower
Senior Member Joined: 02-September-2010 Location: willseyville,ny Status: Offline Points: 1763 |
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an 8in all the bolts are easy to get at on a 9 one or two are not
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handsofstone
Senior Member Joined: 13-April-2018 Location: Northeast Status: Offline Points: 3941 |
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Is the sticker on the door jamb? It will tell you what it came with from the factory. Or look here.
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handsofstone
Senior Member Joined: 13-April-2018 Location: Northeast Status: Offline Points: 3941 |
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My tag is at 11 o'clock. Can't see it in this pic. Sorry about that.
ETA: The bottom can be seen. Edited by handsofstone - 09-December-2018 at 1:10PM |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Thanks everyone, pretty sure it is a 9", I was reading that the 73 model year had the 9". Anyway, I will let you know what I find out. Merry Christmas to all.
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handsofstone
Senior Member Joined: 13-April-2018 Location: Northeast Status: Offline Points: 3941 |
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The 9" pinion won't let you get a socket on the two nuts at the bottom and will destroy your fingers if they are in the way during installation.
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72FordGTS
Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5802 |
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All 1972 and newer Torinos had 28 spline axles from the factory. But check the tag in case it was swapped over the years.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Everyone has been very helpful. I will let you know what I find, also the install does not look too tough. From what I am reading if the ratios are the same the new limited slip should bolt right on. Thanks again!
Mark |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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I am looking at many choices for a limited slip diff, does anyone recommend or not recommend a particular brand. I was considering the Yukon brand. Looking forward to your advice.
Mark |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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i added a yukon one to my blazer... no issues
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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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fordismyboss
Senior Member Joined: 05-January-2014 Location: SF Bay Area Status: Offline Points: 397 |
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I put an Eaton Tru-Trac in my 72GTS and I love it.
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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ratio has little to nothing to do with it, GM uses different carrier housings for different ratios but Ford doesn't. in the Ford 9" there are 2 basic carriers for open differential and Trac-Loc units. the 2 main factors to pay attention to are the axle spline count and the pinion flange. are you planning to replace the entire 3rd member complete or just retro-fit yours with a upgraded center section?
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72 GT Ute
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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I have the 28 spline axles and a rebuilt clutch style differential out of a late 70s lincoln. I know I could break it if I tried but I only run the R-comps at Auto-x and never fully launch the car. If I had to do it over I would probably find the strongest helical style differential and stick to the 28 spline axles. I don't think the axles are the weak link especially when the torque is distributed to both wheels with something like a helical setup and a low final drive is used.
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-Billy Conturo
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Thanks guys, I am planning to replace the center section, but since you mentioned it to rebiuld the carrier seems like it may be easier. This is all new territory for me so I am learning as I go. The bottom line is I want power to both wheels. The helical differential seems like a good idea. I really appreciate all the help.
Marl |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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looks like Torsen only does a 31 spline unit for 9", so factor in complete axle & bearing assy's to the budget ... and they may not be rebuildable? last i heard Auburn unit's are disposable but they do a 28 spline |
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72 GT Ute
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Rons73
Member Joined: 22-November-2018 Location: Alberta Status: Offline Points: 146 |
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The stock clutch style (ford trac-loc?) type are affordable and work great for mild performance applications. Had em in pickups and a bronco, and they work and are easy to rebuild when they don't. I will be upgrading to a Yukon limited slip center and 31 spline axles on my car. I wanted a helical, but i got a smokin deal on the Yukon. And i wanted 31's as I have twisted 28's before, on my dirt track street stock back in the day, so there is that. But if you run street tires they should act as the fuse somewhat. I don't know how Billy gets away with it with that beast of his
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Thanks Ron and all,
I confirmed my rear is a 9 inch today, it still had the tag on the diff, however is rusty so I am deciphering it now. So the 28 vs 31 spline is still unknown. Mark |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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here's where i got mine for my torino...
https://www.ebay.com/itm/FORD-9-INCH-TRAC-LOCK-POSI-TRAC-LSD-NEW-4-SPIDER-28-SPL-MUSTANG-SUPER-SALE/153052133427?hash=item23a29e3833:g:yAkAAOSwft9axT0N:rk:8:pf:0 not a bad deal IIRC i paid $331 for mine a few years ago ( they also have a 31 spline too) |
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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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handsofstone
Senior Member Joined: 13-April-2018 Location: Northeast Status: Offline Points: 3941 |
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Try some sand cloth on both sides. It may tell you what it is. Mine was hard to read until I sanded it down. |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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That is what I am doing. I painted it and now I will stand it.
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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Sand it*
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MrSmog
Senior Member Joined: 21-January-2016 Location: Ky Status: Offline Points: 1407 |
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31 spline will have 3 holes in the end of the axle, 28 splines will have a oval-ish slot in the end of the axle. These cars all had 28 spline axles from the factory, both 8" and 9" used the same axles.
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aquartlow
Senior Member Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2270 |
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I was burned a couple times using the 3 hole I.D. method, both sets of axles I had were 3 hole versions and only one set had 31 splines. Here is a link to Vince's (72FordGTS) work on his Torino's rear axle assembly a few years back, he verified the "deception" : http://forum.grantorinosport.org/rear-axle-questions_topic9149.html Two words to(at least for me) avoid when working on a Ford, never and always, unless of course you have Nomex underwear on .
Edited by aquartlow - 16-December-2018 at 2:24AM |
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www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone. |
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Billy C
Senior Member Joined: 10-February-2010 Location: Pittsburgh, PA Status: Offline Points: 947 |
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Are there any oem 31 spline drop ins for a big tapered bearing style axle housing? Don't mean to high-jack the thread.
In fact, there should be a thread of the different swap options like with the front hub/rotor madness. There are three housings that are a direct bolt on for the Torino. What 31s drop into the small ball bearing housing? What 31s drop into the small taper bearing housing? What 31s drop into the large taper bearing housing? I've had all 3 in 28 spline at some point or another but I'm not sure if I ever took measurements. Maybe I have pictures.
I think I can get away with it because I run a 3.25 or maybe its a 3.50. I can't remember, but it kind of works out like this... ~600ft/lbs (built bb) * 2.87 (TKO 1st) * 3.25 (final drive) = ~5500ft/lbs ~450ft/lbs (build sb) * 2.87 (TKO 1st) * 4.11 (final drive) = ~5300ft/lbs Those two setups have pretty similar potential to break axles and difs and I'm sure tons of folks are running the second one with 28 spline axles. Maybe 450ft/lbs is generous for a small block. I don't know. |
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-Billy Conturo
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72FordGTS
Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5802 |
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I covered off the different rear bearings in this post here:
I didn't cover off housing differences though. The 3 hole thing isn't always true like Todd says. My car has the 1972 axles that were replaced under the recall in 1972. They are 28 spline and have 3 holes in the centre of the axles.
Edited by 72FordGTS - 16-December-2018 at 12:48PM |
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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Markb73gtorino
Member Joined: 23-September-2018 Location: Corpus Christi Status: Offline Points: 78 |
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So I was able to read the tag on my Diff and my torino has a 9' rear end with a 2.75 ratio and a 28 spline. Thanks all for the help. After I finish the steering rebuild the diff is next
Mark |
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