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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 07-11-2012   #1 (permalink)
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Default Ford 8 inch limited slip diff options

Hey all, it's been a while, but I'm still kickin' around.

Anyways, It's time to start ordering parts and I've got a few questions.

1. I'm rebuilding an 8'' rear end because my little 289 hasn't broken 300 hp and probably won't for a while. I've been looking and really need some advice as to who makes the best ring and pinion sets as well as limited slip differentials.

Currie calls their LSD a Torque Sensing Differential:
Currie Enterprises Racing Rear End Categories

Moser has an LSD as well:
Moser Engineering 542059 - Moser Engineering Auburn Pro Series Limited Slip Differentials - Overview - SummitRacing.com

Has anyone had any experience with Currie or Moser/any of these products, I really would appreciate any help I can get.

Thanks in advance guys and girls.
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Unread 07-11-2012   #2 (permalink)
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I have not dealt with either but I have used the powertrax units before and they work FANTASTIC! I bought a rebuilt factory track loc rear end a while back and kept my 2.80 gears. It works amazingly well too.
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Unread 07-11-2012   #3 (permalink)
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Quote:
Originally Posted by Corson View Post
Hey all, it's been a while, but I'm still kickin' around.

Anyways, It's time to start ordering parts and I've got a few questions.

1. I'm rebuilding an 8'' rear end because my little 289 hasn't broken 300 hp and probably won't for a while. I've been looking and really need some advice as to who makes the best ring and pinion sets as well as limited slip differentials.

Currie calls their LSD a Torque Sensing Differential:
Currie Enterprises Racing Rear End Categories

Moser has an LSD as well:
Moser Engineering 542059 - Moser Engineering Auburn Pro Series Limited Slip Differentials - Overview - SummitRacing.com

Has anyone had any experience with Currie or Moser/any of these products, I really would appreciate any help I can get.

Thanks in advance guys and girls.
Hi
I purchased a 3.25 Currie TSD unit and found it was one of my best vendor choices. It has performed perfectly. It's now stored, as it was used when I was running a C4. Since I moved on to a T5, I moved to a lower rear by running a 3.55 now. Money aside, Currie makes a great product, in my experience.
Good Luck!
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333 cu.in, dual Webers, CI cam, TW heads,TRI-Ys, 3.55 rear, T5z, TCP susp., real leather seating
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Unread 07-11-2012   #4 (permalink)
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Thank you both for responding.

Kenash, Was the only reason you replaced the Currie TSD because you stepped up to a larger rear end size? Couldn't you have just replaced the 3.25 ring and pinion with a 3.55 like your sig states you have now?

I'm planning on buying 3.55 gears to go with this TSD, was there any reason you didn't follow this path?
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Unread 07-11-2012   #5 (permalink)
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Quote:
Originally Posted by Corson View Post
Thank you both for responding.

Kenash, Was the only reason you replaced the Currie TSD because you stepped up to a larger rear end size? Couldn't you have just replaced the 3.25 ring and pinion with a 3.55 like your sig states you have now?

I'm planning on buying 3.55 gears to go with this TSD, was there any reason you didn't follow this path?

Hi,
Yes, replacing the gear-set would have been, perhaps, a normal way to go. However, while waiting for parts for a head/cam change, I came across a guy selling a 3.55 trac lok unit for $350. Being a "drop-in", I went with it. I've been running it now for the past couple of years. The 3.55 or even the next lower gear-set would be fine for a T5. Now, with running 25.6" wheels, the 3.55 rear and the .63 5th, at 70 MPH, I'm taching 1975-2000 Rs.
Good Luck!
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1964 1/2 Poppy Red Cvt Resto-Mod
333 cu.in, dual Webers, CI cam, TW heads,TRI-Ys, 3.55 rear, T5z, TCP susp., real leather seating
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Unread 07-11-2012   #6 (permalink)
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currie and moser are both very good companies. both of those units are the same thing, most likely made by eaton. also a very good company!
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Unread 07-11-2012   #7 (permalink)
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I bought my Trac Lok 3rd member from "TJ" on en eBay. The 3.55 gears are great with and AOD or a T5.

tj1141 | eBay

Pictures and write up from my change out:
3.55 Trac Lok Rear

Good Luck and BE safe
Ron
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Unread 07-12-2012   #8 (permalink)
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It's been a while since I've messed with rear gears, but the Auburn limited slip units I am familiar with would not be my choice. They cannot be rebuilt without replacing just about everything in the carrier. They are not the quietest or smoothest units for street use, either. I tried to vintage race one several years ago, and it wore out in three weekends. The Trak Lok style units, either new or used, can be rebuilt easily and are very serviceable for street or occasional competition. The Power Trax of old had way too much freeplay for my taste, but I understand they were bought out by Richmond, who improved them quite a bit. I believe Currie at one time was selling NEW Trak Lok carriers that should be stronger than the originals, since they were 4 pinion units like most 9". The Ford 8" units are all two pinion setups, and that is their weakness.
Best,
Al
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Unread 07-13-2012   #9 (permalink)
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Just some info for you...

Classic Ford Drivetrain Upgrades with Aftermarket Differentials - Modified Mustangs & Fords Magazine
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Unread 07-14-2012   #10 (permalink)
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Thanks guys, is there anything else I need in order to rebuild a complete 3.00 open 8 inch besides:

Curries TSD
Curries 3.55 gears
Summit pinion shim kit
Currie installation kit (washers/nuts/gasket/oil)
Friction modifier

Thanks agian
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Unread 07-14-2012   #11 (permalink)
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Quote:
Originally Posted by Corson View Post
Thanks guys, is there anything else I need in order to rebuild a complete 3.00 open 8 inch besides:

Curries TSD
Curries 3.55 gears
Summit pinion shim kit
Currie installation kit (washers/nuts/gasket/oil)
Friction modifier

Thanks agian
Hi,
I have to ask, are you familiar with the process for setting up a rear? There are a number of settings that need to be checked using a dial gauge. Sorry, i"m not underestimating your wrenching ability, as so much you don't get into something that might not be fixable.
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Unread 07-14-2012   #12 (permalink)
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The correct procedure to set the crush washer uses a 1/4" torque wrench that reads in in-lb not ft-lb.
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Unread 07-15-2012   #13 (permalink)
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Sorry, I didn't fully explain. I've got a few friend up in Maine with all the tools and expertise necessary to help me (do the really hard stuff, and teach me as much as possible), I just have to pick up the parts and bring them, my car and myself up. I was just wondering if I was missing anything obvious.

Thanks
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Unread 07-16-2012   #14 (permalink)
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Quote:
Originally Posted by 66 restomod View Post
I bought my Trac Lok 3rd member from "TJ" on en eBay. The 3.55 gears are great with and AOD or a T5.

tj1141 | eBay

Pictures and write up from my change out:
3.55 Trac Lok Rear

Good Luck and BE safe
Ron
Went same route hppy with choice. Plan on doing again with next build.
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