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Change diff?

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Anderslober View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anderslober Quote  Post ReplyReply Direct Link To This Post Topic: Change diff?
    Posted: 20-May-2020 at 2:36PM
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!Clap
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Post Options Post Options   Thanks (1) Thanks(1)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2020 at 2:42PM
normally it's a 28 spline but best to pull 1 axle and count before you buy Wink
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
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75 VEGA V6 5 SPD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2020 at 3:32PM
on a budget, upgrade your existing 3rd member with a new or used Trac-Loc center section, new gear set and overhaul kit
72 GT Ute
   
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Anderslober View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anderslober Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2020 at 4:29PM
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Anderslober Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2020 at 4:31PM
Johnny....dont forget me......I am still wanting a left front fender section....Smile lemme know....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 20-May-2020 at 4:59PM
i haven't Wink i may have a possibility but would mean a lot of work for meConfused
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 1:03PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 3:53PM
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 3:54PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 9:23PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 9:24PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 21-May-2020 at 9:24PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 22-May-2020 at 4:48AM
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.
Vince

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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 22-May-2020 at 2:15PM
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pete rad Quote  Post ReplyReply Direct Link To This Post Posted: 22-May-2020 at 2:18PM
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Bird Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 3:28AM
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.
"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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 5:28AM
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)
72 GT Ute
   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Bird Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 7:02AM
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.
"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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Post Options Post Options   Thanks (0) Thanks(0)   Quote albo74 Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 11:04AM
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
albos73gts
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dubz Quote  Post ReplyReply Direct Link To This Post Posted: 24-May-2020 at 10:14AM
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
1974 Gran Torino in flat black 351W/C6
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