Used Detroit Lockers or New - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 17 (permalink) Old 11-18-2007, 09:47 PM Thread Starter
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Used Detroit Lockers or New

I would like to upgrade my 9" Trac-Lok differential to a Detroit locker. EBay seems to have a lot of used NASCAR lockers...are these any good? Do lockers wear out like other differentials or are the indestructible? Should I just buy a new one?
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post #2 of 17 (permalink) Old 11-19-2007, 03:22 AM
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Re: Used Detroit Lockers or New

Although it did not come from Ebay,my DL is a Nascar takeout and works perfect.
The detroit locker does not use the clutch pack set up that wears out in other posi units like the Traction lock.

1968 Mustang
11:1 347, Canfields, Bullet roller, Vic Jr, 750 Holley,1 5/8 Hookers,TKO,4.33
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post #3 of 17 (permalink) Old 11-19-2007, 03:30 AM
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Re: Used Detroit Lockers or New

I got a whole 9" N-case w/ new Richmond gears and a Detroit Locker frome ebay and it was a NASCAR takeout. It works perfectly and it only cost me $650. They are just about bullet proof so a used NASCAR one I would have no problem with.
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post #4 of 17 (permalink) Old 11-19-2007, 12:51 PM Thread Starter
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Re: Used Detroit Lockers or New

I figured as much, but on one eBay auction the seller claims it was just rebuilt (maybe he just took it apart and put it back together?).

I will try to pick up one of these lockers on eBay...which will save me half the cost of a new one. Works for me!
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post #5 of 17 (permalink) Old 11-19-2007, 12:54 PM
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Re: Used Detroit Lockers or New

How many hp can handle a N-case?
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post #6 of 17 (permalink) Old 11-19-2007, 01:29 PM
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Re: Used Detroit Lockers or New

Quote:
Originally Posted by Sponge View Post
How many hp can handle a N-case?
My car has a stock N-Case and hasn't broken it yet. Many, many drag strip passes. However, I'd say I'm at the limit of the Moser 31 spline axles and stock N case... especially considering the car is a stickshift.

If you've got an automatic, and are running 10's or slower, you should be fine, as long as you've got aftermarket 31 spline axles, Detroit Locker, N case and Daytona Pinion Support. (at least those items are working for me so far)

Good Luck!


66 Mustang, Toploader 4-speed
Pump Gas 306, 10.134@134.71
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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post #7 of 17 (permalink) Old 11-19-2007, 01:58 PM
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Re: Used Detroit Lockers or New

Yup, Mike is right. I have an N-case w/ 31 spline Moser axles and a Daytona pinion support and the rearend is the last thing I think about when I am at the dragstrip. I figure it is easily good for the low 10's. But I would definitely go with a locker because they are so darn tough even if they do clunk a little bit in the turns. But the clunking let's people know you mean bidness!
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post #8 of 17 (permalink) Old 11-19-2007, 02:18 PM
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Re: Used Detroit Lockers or New

Mine is the newer 'soft locker' with works the same as the old ones, but has a bellville spring between the gears so they don't bang together so hard. The NASCAR units probably don't have this.

Good Luck!


66 Mustang, Toploader 4-speed
Pump Gas 306, 10.134@134.71
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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post #9 of 17 (permalink) Old 11-19-2007, 02:19 PM
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Re: Used Detroit Lockers or New

what is a N case is that a stock diff,sorry took a crash corse looked it up on the net, but i have a question also are these diff case interchangable on any diff for instance a 1994 explorer or whould i have to change the complete thing

Last edited by macrael; 11-19-2007 at 02:33 PM.
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post #10 of 17 (permalink) Old 11-19-2007, 03:31 PM Thread Starter
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Re: Used Detroit Lockers or New

Quote:
Originally Posted by macrael View Post
what is a N case is that a stock diff,sorry took a crash corse looked it up on the net, but i have a question also are these diff case interchangable on any diff for instance a 1994 explorer or whould i have to change the complete thing
N = nodular iron (I believe they had a higher nickel content).

A 9" N case would not work with a '94 Explorer rear end, but would fit any other 9" rear end housing 1957-mid 80's.
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post #11 of 17 (permalink) Old 11-19-2007, 03:35 PM Thread Starter
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Re: Used Detroit Lockers or New

So about lockers and noise...how loud are these things around turns (those without a soft locker)? Should I hunt for a soft locker instead of a standard locker if it's going into a street/strip car?
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post #12 of 17 (permalink) Old 11-19-2007, 06:55 PM
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Re: Used Detroit Lockers or New

There is a fairly loud click -click -click-sound while you are turning that the locker makes as it ratchets.Mine is street/strip and the noise doesn't bother me.It sure beats replacing t-lock clutches and one wheel burn outs.
What does kinda bother me is when I take a turn at a car show or cruise in and a "mechanic" comes over and informs me that I have a bad U-joint or my diffs about to take a crap(because he heard the locker)lol.

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post #13 of 17 (permalink) Old 11-19-2007, 07:34 PM
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Re: Used Detroit Lockers or New

It gets people's attention that's for sure. It sounds like the clicking noise you hear when you're going up a roller coaster. I love mine, I will never use anything but a locker. Definitely fun when you gun it around a corner. I also got mine off eBay and its a Nascar unit as well. Well worth the money IMO.

68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's

70 F100, 302, FMX, 9"
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post #14 of 17 (permalink) Old 11-19-2007, 08:17 PM
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Re: Used Detroit Lockers or New

My soft locker makes absolutely no noise. You can feel it engaging and disengaging, but there is no clicking around turns.

It's almost like a limited slip. You just don't want to step on the gas hard in the middle of a turn... especially if it's raining.

No problem. Nice, durable units.

Good Luck!


66 Mustang, Toploader 4-speed
Pump Gas 306, 10.134@134.71
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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post #15 of 17 (permalink) Old 11-19-2007, 10:12 PM
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Re: Used Detroit Lockers or New

For my pony, I didn't want the click-click sound that's why I bought a limited slip differential (Auburn Pro Series). Hope I did a good choice...
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