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Old 06-11-2013, 11:15 PM
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Input on Powertrax Lock-Right in 68 mustang

Hey everyone long time no post. I've been incredibly busy with so many new things goin on in my life. I'm back and need a little input.

So the build on my sister 68 mustang is finally underway. I have the front suspension, steering, engine and trans rebuilt. I'm currently working on the rear end now and that is were I need a little input...

It's a 8" rear end (plenty strong for the build) 28 spline axles with 2.79 gears. The only thing that really needs to be replaced are the spider gears inside the carrier. The axles are in great shape the gear set is surprisingly in great shape as well. I was going to install a basic posi rather then new spider gears. But I found they are no all that cheap for the 8" then I thought of the cheap small effective mini locrite locker... My only concern is how jerky will it be in such a lightweight Vehical???? I have one in my 70 el camino and I absolutly LOVE it but I have far more power with traction adding suspension and a wicked firm trans. Her mustang is a bit lighter in weight maybe 300hp with a nicely built c4 comfort built suspension... So my main question is just how jerky might it be???

I notice the locrite in my el camino only while driving it hard will it be the same in her mustang?

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Old 06-12-2013, 05:56 AM
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I edited the thread title with the proper name of the Lock Right so folks may have a better idea of questions you have


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Old 06-12-2013, 06:09 AM
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Here is the problem. The 8 and 9 inch Ford Lock Right use the axle gears as part of the locker. If your axle gears are in bad shape then you don't have everything that you need for the installation. I recommend finding a Traction Lock or Truetrac for this application. Your sister will be much happier with one of these.
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Old 06-12-2013, 09:02 AM
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YDGF8-28-AG [26001]

Yukon Trac-Loc for Ford 8" with 28 spline axles. Aggressive Design The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction. The Yukon-Trac Loc uses a nodular case, billet si...
YDGF8-28-SM [26002]

Yukon Trac-Loc for Ford 8" wtih 28 spline axles. Street Design The Yukon Dura Grip provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Yukon Dura Grip Positraction. The Yukon-Trac Loc uses a nodular case, billet si...
YGLF8-28 [28006]

Yukon Grizzly Locker for Ford 8" with 28 spline axles The Yukon Grizzly Locker is the ultimate in locking differentials for street, off-road, & drag racing. Grizzly Lockers provide 100% power to both tires, while still allowing for disengagement while negotiating turns. The Yukon Grizzly locker is a...


Either of these are a great option. I'm not posting prices as we are not a vendor on the board yet.
I think the lock rite can work just fine for you seeing as your used to it in your other rig but if it's your wife I would doubt it unless she drives your car a lot.

Thanks,
Bobby
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Old 06-12-2013, 09:15 AM
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Bobby, I've got a question about your Trac Lock. I've had some issues with the Yukon Trac Lock for the 9 inch Ford and I'm wondering if the 8 inch is the same. The ring gear bolt holes in the 9 inch unit are clearance drilled for 1/2 inch bolts even though the 9 inch uses 7/16 bolts. This has causes some major problems for me in the past due to the fact that the head of the bolt is just barely larger than the hole. When I called and asked about this I was given the standard BS answer "we've never had any problems with that before". So now I have an almost new 9 inch Trac Lock sitting on my shelf that I can't use and I'm scared to sell it to someone else because of this problem. I've contacted all of my customers who bought one of these from me and told them about the problem, so I'm expecting more of them to return. Why are the bolt holes drilled for 1/2 inch bolts when the bolts are 7/16 with a 5/8 head?

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Old 06-12-2013, 11:50 AM
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That seems odd using the existing side gears. Well ill keep my hunt going on what I want to use. But for future reference how jerky would it be if it was used? I know this wont be m last mustang build is why I'm asking
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Old 06-12-2013, 11:54 AM
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Quote:
Originally Posted by big gear head View Post
Bobby, I've got a question about your Trac Lock. I've had some issues with the Yukon Trac Lock for the 9 inch Ford and I'm wondering if the 8 inch is the same. The ring gear bolt holes in the 9 inch unit are clearance drilled for 1/2 inch bolts even though the 9 inch uses 7/16 bolts. This has causes some major problems for me in the past due to the fact that the head of the bolt is just barely larger than the hole. When I called and asked about this I was given the standard BS answer "we've never had any problems with that before". So now I have an almost new 9 inch Trac Lock sitting on my shelf that I can't use and I'm scared to sell it to someone else because of this problem. I've contacted all of my customers who bought one of these from me and told them about the problem, so I'm expecting more of them to return. Why are the bolt holes drilled for 1/2 inch bolts when the bolts are 7/16 with a 5/8 head?
The holes are based off of the factory dimensions from Ford. The 8" case uses the same as the 9". What problems did you have exactly? Do you have any pictures showing the issue so I can talk to Yukon about it?
[SIZE=2]Thanks,
Bobby
[/SIZE]
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Old 06-12-2013, 11:57 AM
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Or.... If I could buy a new set of side gears (provided its cost effective) I could still use the lock right. But I dont want it if its going to be jerking her around much. If its just a small pop and clicking around turns that's fine.

I hardly know its in mine untill I get out and see twin marks lol.
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Old 06-12-2013, 12:08 PM
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I think a True Trac for this is a better alternative. The problem with buying a 'Lock Right' is if your sister hates it; you're out the money for that, AND whatever you put in its place. If you put in a mild Trac Loc or True Trac, Im almost 100% sure she won't say 'Its not violent enough, I need a more abusive rear axle." If she wants more performance, get rid of those weenie rear gears for 3.31/3.50 etc.
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Old 06-12-2013, 12:20 PM
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Any axle shop probably has dozens of old Ford 9 diffs laying about, I know I do.
I would prefer the TracLock or the TrueTrac for a street cruiser.
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Old 06-12-2013, 12:25 PM
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Quote:
Originally Posted by Randy's Gear Supply View Post
The holes are based off of the factory dimensions from Ford. The 8" case uses the same as the 9". What problems did you have exactly? Do you have any pictures showing the issue so I can talk to Yukon about it?
[SIZE=2]Thanks,
Bobby
[/SIZE]
The ring gear bolts all came loose. I used the correct bolts and the correct washers, along with red Locktite. When I torqued the bolts the washers cracked. I took them out and installed a new set of washer and they also cracked. This is due to the hole being almost the same size as the head of the bolt. I have several Ford Trac Lock differentials and they are drilled for 7/16 bolts. This is not a problem with them. I went ahead and install this differential thinking that it would be all right, but after less than 600 miles the ring gear was completely loose on the differential and the bolt heads were eating into the side of the case. I'm a toolmaker in a jet engine factory and I know that you don't clearance drill a hole for a 1/2 inch bolt if you are going to install a 7/16 bolt. That is just plain stupid.
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Old 06-12-2013, 12:44 PM
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Avoid teh Lockrite "lunchbox" lockers. I went therough 3 of them in a GM 10 bolt. There was lots of driveline slop, severe banging noises when turning sharp into parking spots. In amnual trans vehicle it would be horrible, and automatic was bad enough.

Powertrax's No Slip Traction system would be a better option PERHAPS, as its a sightly better design, but then you are into an Eaton Trutrac price range.

'Spend the extra money and get an actual aftermarket carrier. It will be stronger and better in the end.

peace
Hog
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Old 06-12-2013, 12:50 PM
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Avoid Powertrax/Richmond Lock Rite Locker. I went through 3 of them before giving up on across country international shipping for warranty jobs. In a GM 10 bolt 8.5" rear.

I could have bought a kick *** Eatorn Detroit Trutrac for less money in the end. Lock rite added much drivetrain slop, and made very loud banging noises when turning sharp into parking spots. Is a true locker, but will eventually wear out simply due to its design of metal on metal dog clutches.

Forces teh use of an open stock dif, nuying an aftermarket carrier will be much stronger.

peace
Hog
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