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Change diff? |
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Anderslober 
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Joined: 30-July-2019 Location: Denmark Status: Offline Points: 763 |
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 Topic: Change diff?Posted: 20-May-2020 at 2:36PM |
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Hello forum. I am slowly starting restoration of my 72 GTS 351-CJ/4sp.
According to the Marti report, my car has a `conventional rear ax le`...open diff. I would like to change the diff to a trak-lok or similar. My question is...what spline is the diff?
I would like to go with a 3.50 trak lok......any ideas on where to get one?. I am on a budget!
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californiajohnny
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Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14566 |
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Posted: 20-May-2020 at 2:42PM |
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normally it's a 28 spline but best to pull 1 axle and count before you buy
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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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Rockatansky
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Joined: 30-July-2010 Location: On The Road Status: Offline Points: 5940 |
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Posted: 20-May-2020 at 3:32PM |
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on a budget, upgrade your existing 3rd member with a new or used Trac-Loc center section, new gear set and overhaul kit
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72 GT Ute
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Anderslober
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Posted: 20-May-2020 at 4:29PM |
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Yuuup! Those are my exact intentions. I will pull the axle and make sure...and then buy a kit.
Will post....
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Anderslober
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Posted: 20-May-2020 at 4:31PM |
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Johnny....dont forget me......I am still wanting a left front fender section....
 lemme know....
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californiajohnny
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Posted: 20-May-2020 at 4:59PM |
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i haven't
i may have a possibility but would mean a lot of work for me |
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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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pete rad
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Posted: 21-May-2020 at 1:03PM |
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A 31 spline kit is below.
https://www.ebay.com/itm/9-Ford-Trac-Lock-Posi-31-Gear-Bearing-Kit-Package-3-50-Ratio-9-Inch-NEW/371998905126?hash=item569cdcd326:g:8b0AAOSwfcVUCkZx A 28 spline kit is below. https://www.ebay.com/itm/9-Ford-Trac-Lock-Posi-28-Gear-Bearing-Kit-Package-3-50-Ratio-9-Inch-NEW/222477661747?hash=item33ccb3b633:g:kHcAAOSwm7pZvLsK:sc:ShippingMethodStandard!10701!US!-1&shqty=1&isGTR=1#shId Edited by pete rad - 26-May-2020 at 9:31PM |
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pete rad
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Posted: 21-May-2020 at 3:53PM |
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There are 2 more ring and pinion sets below, you will have to ask the person who is selling them if they are for the traction lock/limited slip differentials.
https://hartford.craigslist.org/pts/d/enfield-ford-350-ring-and-pinion-for-9/7113409575.html https://akroncanton.craigslist.org/pts/d/akron-350-ratio-ford-ring-and-pinion/7119475125.html Edited by pete rad - 21-May-2020 at 4:10PM |
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pete rad
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Posted: 21-May-2020 at 3:54PM |
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pete rad
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Posted: 21-May-2020 at 9:23PM |
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pete rad
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Posted: 21-May-2020 at 9:24PM |
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pete rad
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Posted: 21-May-2020 at 9:24PM |
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72FordGTS
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Posted: 22-May-2020 at 4:48AM |
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Definitely pull the axle to check the spline count. If you can rebuild the rear end yourself you will save a lot of money just buying a kit listed above. Even if you can't rebuild the rear end, maybe there is someone local that can do it?
Summit and Speedway have fully assembled third members but they are way pricier and would cost a lot to ship overseas. But a Currie or Moser rear end has upgrades over a stock Ford rear.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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pete rad
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Posted: 22-May-2020 at 2:15PM |
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pete rad
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Posted: 22-May-2020 at 2:18PM |
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https://bozeman.craigslist.org/pts/d/bozeman-ford-9-rear-ends/7125196938.html
This next person below has a 9" for sale but he does not know what gear ratio it is, or if it is a trac loc. But the price is good. https://fortcollins.craigslist.org/pts/d/fort-collins-ford-9-differential-31/7112416894.html |
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Big Bird
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Posted: 23-May-2020 at 3:28AM |
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Gear sets are the same trac-loc/no trac-loc. Aftermarket lockers are probably a better deal than rebuilding a 40+ year old unit. Shipping will probably be a killer.
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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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Rockatansky
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Posted: 23-May-2020 at 5:28AM |
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i have a PowerTrax Loc-Right unit in my 2011 Crown Vic 8.8 ... (retrofit Detroit locker style differential) i definitely don't recommend it for a daily driver type vehicle and would not do it again. it's coming out and a Trac-Loc out of a Mustang is going in (clutch pack limited slip style differential)
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72 GT Ute
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Big Bird
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Posted: 23-May-2020 at 7:02AM |
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Powertrax and any Detroit lockers are BRUTAL, especially in snow... Was thinking modern replacements as opposed to re-re-rebuilding 40+ year old stuff when the supply line for parts is 1800 miles long.
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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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albo74
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Posted: 23-May-2020 at 11:04AM |
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This is the same set up I have in my car . 351 CJ with a 4 speed manual shift , The original owner knew just what he wanted , and I do like the Bench seat. but he ordered it with the 3.50 open rear end , I never drive this car in the rain or snow , I'm thinking Speed way 3X2 gears only, 3.50 , 28 spline is the way to go , https://www.youtube.com/watch?v=mnuGDOfhdd4
Edited by albo74 - 23-May-2020 at 11:13AM |
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albos73gts
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Dubz
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Posted: 24-May-2020 at 10:14AM |
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anyone on here running a truetrac setup? It's what I've been eyeing for when I get to the stage of getting an LSD, seems like a good deal that you don't need clutch rebuilds or dealing with the issues of a standard detroit locker.
For over the pond, it might be a good option so you aren't needing extras in a few years? Edited by Dubz - 24-May-2020 at 11:59AM |
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1974 Gran Torino in flat black 351W/C6
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