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Author Topic: My 9" rear differential question  (Read 11776 times)
Fordota
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« Reply #15 on: August 19, 2009, 05:56:20 pm »

Just curious if anybody runs airlockers in cars? Like for a S/S application heavy on street? Fully open differential to Full Spool.
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« Reply #16 on: August 19, 2009, 06:06:33 pm »

I will also be running a strange spool with 35 spline axles on the street, have done this before. Just make turns slow and do not drive in the rain. Darren
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dennis112
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« Reply #17 on: August 19, 2009, 07:07:47 pm »


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!

The True Trac was fine on wet roads and general driving.  I really liked it on the street and it was predictable.  I saw little difference in driving style vs the clutched Traction Loc.  I mostly noticed that the True Trac was more forgiving on wet roads.   Both gave some feedback when turning sharply at low speed, such as from a stop sign.  

When I wanted to spin the wheels, the True Trac always gave me dual equal length tread patterns--unfortunately it was a let down at the track and the spool was an easy tenth faster.  That is about all I have to pass on.

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Dennis

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« Reply #18 on: August 20, 2009, 01:59:28 am »

The True Trac was fine on wet roads and general driving.  I really liked it on the street and it was predictable.  I saw little difference in driving style vs the clutched Traction Loc.  I mostly noticed that the True Trac was more forgiving on wet roads.   Both gave some feedback when turning sharply at low speed, such as from a stop sign.  

Thanks.  I finished driving my Merc back from the shop with my new 31 spline axles and the TrueTrac.  I notice a big difference.  My car launches alot straighter and faster -- and now when I let off of the gas after speeding my rear doesn't shake.  I figure that my old Trak-Loc was worn out and not working good at all is for the huge difference.  I'm happy and I at least feel safer for when I put in the 445" on the DD with street radials . . .
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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 #19 on: August 20, 2009, 10:03:15 am »

 I'm happy and I at least feel safer for when I put in the 445" on the DD with street radials . . .

Talk about feeling safe -- this coming Monday the 24th I'm also taking my Merc to Deaver Springs Manufacturing in Santa Ana, CA to have a radical set of leaf springs and huge U-bolts fabbed up for my Merc so it can safely handle the power of the up and coming 445" SBF stroker -- thank God for MasterCard . . .
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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 #20 on: August 22, 2009, 12:10:29 pm »

Curious about the size of your axle U-bolts for the members who have serious HP and are running with leaf springs?  I currently have 7/16" U-bolts on this combo and break the damn things with my slapper bars . . .  
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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 #21 on: August 22, 2009, 01:04:06 pm »

Size of your axle U-bolts?  Anyone?   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 #22 on: August 22, 2009, 07:38:04 pm »

Curious about the size of your axle U-bolts for the members who have serious HP and are running with leaf springs?  I currently have 7/16" U-bolts on this combo and break the damn things with my slapper bars . . .  

Doesn't anyone have leaf springs?   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!
mmb
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« Reply #23 on: August 22, 2009, 08:40:08 pm »

aren't those on wagons horses pull   



 
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« Reply #24 on: August 22, 2009, 09:02:19 pm »

aren't those on wagons horses pull   



 

 Whistling             
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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 #25 on: August 22, 2009, 09:14:19 pm »

The Lakewood bars you use are the ones with the J-bolts?
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Seb
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« Reply #26 on: August 22, 2009, 09:26:15 pm »

The Lakewood bars you use are the ones with the J-bolts?

No - they are "U" bolts, too -- but the bottom part is flat and not rounded.  What keeps braking are the axle U-bolts that hold the axle to the leaf springs.  They are 7/16".  The plates that those U-bolts fasten to look like that they really can't be drilled any wider or there won't be enough metal left.  I'm hoping that the Deaver Springs place can fab me up a wider set of plates and to use the thickest axle U-bolts necessary for 700HP on street tires using Lakewood traction bars -- I can tell you with just 1/2 gas pedal my new Detroit TrueTrac friggin' hooks up real serious now . . .
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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!
SteveL
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« Reply #27 on: August 26, 2009, 10:47:03 am »

Are you over torquing the bolts??

http://www.eatonsprings.com/ubolttorques.htm

I'm using 1/2" U-bolts on my Capri with slapper bars, I just check them
every so often when I'm under there...



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Steve.K.Bates

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« Reply #28 on: August 26, 2009, 11:10:06 am »

Are you over torquing the bolts??

http://www.eatonsprings.com/ubolttorques.htm

I'm using 1/2" U-bolts on my Capri with slapper bars, I just check them
every so often when I'm under there...





Thanks, man.  That is some much needed info for me.  I just got my car back from the spring shop -- they added another leaf and also a special leaf they called a rebounder leaf to do the job of my slapper bars.  They changed my 7/16" u-bolts to 1/2" ones and said that my new set-up suspension-wise will handle 700HP on street radials.  The rear is tight just like it was with my slapper bars installed.  Off of a green light it comes out real good and fast and straight.  I'm very happy with it.
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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 #29 on: August 27, 2009, 10:46:27 pm »

Just curious here, had you you given Cal-tracs any thought? I will put them on my 72 Comet in place of the original thought of the upper mount traction bars [used in mustangs] as I don't want to weld [I may change my mind] on my 14K mile car..I have checked all the  u-blots left over from the 70/71 Torinos [couple GT's too] and everything I have is 1/2,  all 9" rears..Pretty sure the Comet is 1/2 too but I'll check when I change the oil this week, All I can remember is that I had to "massage"  them around the 9" housing....Are the spring perches strapped around the housing? And no bars now?
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Seb
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