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Author Topic: My 9" rear differential question  (Read 11762 times)
69 Merc
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« on: August 18, 2009, 11:27:25 am »

I am getting my ride ready for 700HP.  It is my DD.  On the way to work there is a stretch of back roads that in the early morning hours is deserted and I'm able to let loose.  I am upgrading from 28 spline axles to 31 spline next week.  I currently have Ford's Trak Loc.  It's old.

I'm thinking on getting a Detroit Locker unit for my differential.  I don't think that the Trak Loc will handle my new motor's power level.  I at times drive my Merc like it's stolen!  Anyone with Detroit Locker street driven experience please give me some heads up.   Thanx!
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
engineb
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« Reply #1 on: August 18, 2009, 11:51:06 am »

In my experienceit will take a little getting used to. They usually are a little clunky but get the job done.
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69 Merc
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« Reply #2 on: August 18, 2009, 11:59:16 am »

In my experienceit will take a little getting used to. They usually are a little clunky but get the job done.

OK.  "Clunky" as in normal sounding and not ripping stuff up "clunky", right?  I can get used to normal sounds . . .  
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
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« Reply #3 on: August 18, 2009, 12:09:11 pm »

And I've heard that when you hit the throttle whatever direction your front tires are pointing is where your car is gonna go . . .
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
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« Reply #4 on: August 18, 2009, 12:57:47 pm »

Update -- my driveline specialists named Unitrax here in Anaheim, CA strongly recommended to me instead of the Detroit Locker to use the Detroit Truetrac Locker.  They said that that is VERY strong and much better suited for my DD Merc.  That is what's gonna happen, then.  I'm taking my Merc to Unitrax after work today for the Detroit Truetrac Locker and a 31 spline axle upgrade . . .
                                                              
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
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« Reply #5 on: August 18, 2009, 04:19:54 pm »

I had a tru-trac in the front and rear of my toyota with the 289 and dad has one in his bronco. We both LOVE them. Super smooth and so tight that you wont know your not locked up except for the good manners. Since its a word drive unit its strong with no clutches to wear out. The best thing is since its mechanical even when its 17 years old it will still engage with one revolution of the tire. You'll love it. I would get one in a heartbeat if I could get on in 35 sp.
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"I want to cheat, but remain in the grey area... not a full blown rat bastard cheater." -347HO

418w + 93 toyota pickup - check it out @  http://sbftech.com/index.php/topic,15697.30.html
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« Reply #6 on: August 18, 2009, 04:52:07 pm »

True tracs are strong, but not invincible.  I tore up a 9" 31 spline true trac at the track using a 450hp motor, a 4 speed, 4.11 gear, and little 26x10x15" slicks.  Took about 75 runs.  Perhaps it was due to the twisted axle splines, I don't know.  Also, repair parts are absolutely not available for them.  Says so right in the manual.  Since there is lots of metal to metal contact and numerous "gears", wear is inevitable.  Also, the thing didn't launch the same each time at the track or on the street.  You never knew which way the ass end was going to go.  This experience lead me to using a full spool and 33 spline axles which I think is the tits in my street/strip ride.













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Dennis

65' Stang, 434W NA, Victor Heads, Super Vic Intake, 11:1, Braswell Carb, Bullet SR Cam, G101A 4-Speed, 4:56 rear, 93 Octane Pump Gas  9.82@138.00
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« Reply #7 on: August 18, 2009, 08:27:02 pm »

 You never knew which way the ass end was going to go.  This experience lead me to using a full spool and 33 spline axles which I think is the tits in my street/strip ride.

You run with a full spool on the street?   Hmmmmm
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
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« Reply #8 on: August 18, 2009, 08:41:59 pm »

Quote
You run with a full spool on the street?
      Yes you can as long as you keep the tire pressure up and don't make your turns any tighter than necessary.
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superduty69
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« Reply #9 on: August 18, 2009, 09:10:36 pm »

Quote
You run with a full spool on the street?
      Yes you can as long as you keep the tire pressure up and don't make your turns any tighter than necessary.

I run a spool also and agree with quickshift. Parking lots can be a pain sometimes but other than that no problems.
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« Reply #10 on: August 18, 2009, 10:26:22 pm »

Quote
You run with a full spool on the street?
      Yes you can as long as you keep the tire pressure up and don't make your turns any tighter than necessary.

I run a spool also and agree with quickshift. Parking lots can be a pain sometimes but other than that no problems.

What makes it a pain? I always thought your tires just chirped. I would think some vibration too possibly.
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Phil.
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« Reply #11 on: August 19, 2009, 12:36:31 am »

I have heard a lot of truck guys say they prefer spools vs detroits on the street. The both chirp the same, but with the spool you dont have the unpredictability. (you dont think, you know its going to oversteer  Grin)
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"I want to cheat, but remain in the grey area... not a full blown rat bastard cheater." -347HO

418w + 93 toyota pickup - check it out @  http://sbftech.com/index.php/topic,15697.30.html
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« Reply #12 on: August 19, 2009, 06:22:01 am »

 You never knew which way the ass end was going to go.  This experience lead me to using a full spool and 33 spline axles which I think is the tits in my street/strip ride.

You run with a full spool on the street?   Hmmmmm

Yep--the car is very predictable on dry pavement.  I do not mess around when the road is wet (and didn't with the True Trac either.)  On the highway/streets I don't even know the difference.  When making sharper turns I do feel the inner wheel being drug around the corner.  Hell, even the True Trac would drag the wheel a little at times.   Typical left hand turns at traffic lights feel normal.  If I did tons of in city driving I would consider a different differential.

If you consider a spool for the street, use a full spool as the mini's might not hold up in the long run.
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Dennis

65' Stang, 434W NA, Victor Heads, Super Vic Intake, 11:1, Braswell Carb, Bullet SR Cam, G101A 4-Speed, 4:56 rear, 93 Octane Pump Gas  9.82@138.00
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« Reply #13 on: August 19, 2009, 09:49:54 am »


I do not mess around when the road is wet (and didn't with the True Trac either.)  On the highway/streets I don't even know the difference.  When making sharper turns I do feel the inner wheel being drug around the corner.  Hell, even the True Trac would drag the wheel a little at times. 

I used to have Ford's Trak-Loc.  The man at Unitrax told me that my new Truetrac is a night and day difference between it and the friction padded Trak-Loc.  So you're saying to be careful with the Truetrac on wet surfaces and around turns.  Any more pointers for me along those lines?   Thanx!
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 1" aluminum open spacer, CamMotion HR .624"/.609" 251*/256* 108* LSA, 1-3/4"x3-1/2" headers, Dynomax Ultra #17224 mufflers, C6/4R100 trans, 8"/9" 5500 converter, Broader Performance manual V/B, 9" 4.56 Detroit Truetrac, Hoosier Pro Street 31x12.5R15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html  Now = http://sbftech.com/index.php/topic,34648.0.html

Thanks to Jim "Woody" and Nicole Woods @ 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!
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« Reply #14 on: August 19, 2009, 04:38:43 pm »

Quote
You run with a full spool on the street?
      Yes you can as long as you keep the tire pressure up and don't make your turns any tighter than necessary.

I run a spool also and agree with quickshift. Parking lots can be a pain sometimes but other than that no problems.

What makes it a pain? I always thought your tires just chirped. I would think some vibration too possibly.

With my manual steering, any slow speed maneuvering is a little more of a pain. No vibrations or anything, i will not hesitate to run another.
I only had it on wet roads one time, that was interesting.

John
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