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| | | |-+ How about a sticky with pics and need help identifying 8" third member
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Author Topic: How about a sticky with pics and need help identifying 8" third member  (Read 3314 times)
ochohill
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« on: February 13, 2012, 09:54:35 pm »

Can the stellar staff at SBFTech.com create a sticky to help the masses identify third members?

I got a new 8" third member as part of a deal of used parts.  I would like some help identifying if it is a trac loc or locker differential. I need to know if it needs the special clutch additive.
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SteveL
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« Reply #1 on: February 13, 2012, 10:22:45 pm »

Does it still have the little metal tag under one of the mounting nuts?

What does it say??

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Steve.K.Bates

To be honest, when you buy cheap, you invest in disappointment...
-Invalidboy
frdnut
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« Reply #2 on: February 13, 2012, 11:17:53 pm »

A stock type trac lok will have the ring gear bolts recessed into the carrier a little..This is because the side of the carrier is bulged out a little to allow room for the clutch plates..If you do a google search you can find lots of images online to see the differences in the two...If in doubt just add the friction modifier..It won't hurt it anyway if its a locker.
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68 mustang J code 408W,Vic Jr top end,CI solid roller,Toploader,4:11 locker.... 11.59 @ 120.95
68mustang405
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« Reply #3 on: February 14, 2012, 01:12:12 am »

umm.. can't you just turn the wheel on one side and if the other wheel turn the same direction it's a locker?
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68 Mustang 310 twisted wedge 170, tfs1, weiand stealth, 1.6 rr t5 3.55s with a locker, a/c and all the creature comforts.

On a serious note.. wagon made 3000hp on the dyno
ochohill
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« Reply #4 on: February 14, 2012, 04:28:02 pm »

No metal tag, this appears to be a new unit. I knew about the recessed holes. That info is at other locations on the web. What I haven't found is a definitive this is what a XXXXXX looks like etc.

On the spinning thing, there are times with an open diff both axles will spin the same direction. The real test there is if you can spin one side by hand with the other side stationary. A trac lock or locker should not spin by hand in that case (assuming the clutches are still good).

I couldn't get my fat ass off the couch last night. I will get it done tonight, St Valentine willing.
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ochohill
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« Reply #5 on: February 14, 2012, 08:28:37 pm »







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69 Merc
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« Reply #6 on: February 14, 2012, 09:28:56 pm »

 Wonder, Ponder
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

You get to ONLY have TWO of the following -- cheap, fast, dependable.

IOW -- if it is fast and dependable it will not be cheap.  If it is fast and cheap it won't be dependable.  If it is cheap and dependable it will not be fast!


Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
frdnut
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« Reply #7 on: February 14, 2012, 11:05:29 pm »

That is a trac lok.
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68 mustang J code 408W,Vic Jr top end,CI solid roller,Toploader,4:11 locker.... 11.59 @ 120.95
68mustang405
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« Reply #8 on: February 15, 2012, 02:11:09 pm »

That is a trac lok.

What I was thinking, there would be anything between the two spider gears.
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68 Mustang 310 twisted wedge 170, tfs1, weiand stealth, 1.6 rr t5 3.55s with a locker, a/c and all the creature comforts.

On a serious note.. wagon made 3000hp on the dyno
69 Merc
The Ricer King
Adv_SBFTechie
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Location: OC, CA

« Reply #9 on: February 15, 2012, 03:03:00 pm »

That is a trac lok.


How can you tell?     
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

You get to ONLY have TWO of the following -- cheap, fast, dependable.

IOW -- if it is fast and dependable it will not be cheap.  If it is fast and cheap it won't be dependable.  If it is cheap and dependable it will not be fast!


Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
frdnut
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« Reply #10 on: February 15, 2012, 03:21:41 pm »

Just by the look of the carrier...It is "thicker" so it can house the clutch plates inside..That is why the ring gear bolts appear to be recessed.
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68 mustang J code 408W,Vic Jr top end,CI solid roller,Toploader,4:11 locker.... 11.59 @ 120.95
frdnut
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« Reply #11 on: February 15, 2012, 03:23:03 pm »

That is a trac lok.

What I was thinking, there would be anything between the two spider gears.
Huh?..Not sure what you are saying or asking?
Here is a link with some good info on 8 and 9 inch rears.
http://www.kevinstang.com/Ninecase.htm
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68 mustang J code 408W,Vic Jr top end,CI solid roller,Toploader,4:11 locker.... 11.59 @ 120.95
68mustang405
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« Reply #12 on: February 15, 2012, 11:58:55 pm »

the open carriers i've seen haven't had anything between the two verticle spider gears is what I meant. Usually if there's some type of device there it's a trac lok. IMO.
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68 Mustang 310 twisted wedge 170, tfs1, weiand stealth, 1.6 rr t5 3.55s with a locker, a/c and all the creature comforts.

On a serious note.. wagon made 3000hp on the dyno
frdnut
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« Reply #13 on: February 16, 2012, 02:36:17 pm »

the open carriers i've seen haven't had anything between the two verticle spider gears is what I meant. Usually if there's some type of device there it's a trac lok. IMO.
That "block" sort of piece in between the spiders doesn't necessarily mean its a trac lok..It is a support for a 4 pinion setup..What that means is it has 4 little gears instead of 2..The block supports the ends of the two pins that the extra two gears run on..
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68 mustang J code 408W,Vic Jr top end,CI solid roller,Toploader,4:11 locker.... 11.59 @ 120.95
68mustang405
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Location: Oklahoma City, OK

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« Reply #14 on: February 16, 2012, 10:45:50 pm »

Oh i see what you're saying..
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68 Mustang 310 twisted wedge 170, tfs1, weiand stealth, 1.6 rr t5 3.55s with a locker, a/c and all the creature comforts.

On a serious note.. wagon made 3000hp on the dyno
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