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Author
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Topic: 5 Leaf Reverse Eye Springs - INSTALLATION RESULTS
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rockafellz
Gearhead Posts: 1312
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 07-01-2002 11:41 PM
   
Hey Fellas,My dad and I changed the original leaf springs to some 5-leaf reverse eye springs in my '66 fastback this afternoon and have some interesting results and a few questions. First off, it was a b!tch to remove those front-eye bolts but we were persistent and "strong" hammered that sucker out!! I was happy we didn't need to do any cutting. Anyway, the springs actually raised the rear nicely compared to the original springs (about a 1.5 finger clearance from top of the wheel fender to the tire). Secondly and more importantly, there is now a strong loud humming sound when driven, especially at low speed. Our assumption is the the new springs changed the angle of the differential and the pinion bearings are spinning at a different angle?!? Maybe?!? The only other thing "I" can think of is maybe we tightened the u-bolts to the differential housing too tight but I torqued them to spec @ 40ft/lbs to the recommended 35-45ft/lbs per the Ford shop manual. My dad and neighbor said that the bolts or nut would strip before that housing tube would bend. Plus it doesn't look like it bent anyway. Help us out please!! Thanks in advance. Erik p.s. The rear-end is an original 3.00:1 open differential and to my knowledge has never been rebuilt. Before the leaf spring swap, the differential never made noise. ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored [This message has been edited by rockafellz (edited 07-01-2002).]
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V8 Thumper
Gearhead Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 07-02-2002 08:35 AM
Does this 'humming' noise increase upon acceleration, or does it increase under deceleration? Any vibration?With the additional arch of the new springs, it is possible that the pinion angle is now increased; enough to make it howl? You may be ready for a 3rd member overhaul  It is full of gear oil, right?
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ccode67
Gearhead Posts: 1697
From: douglasville,ga,usa
Registered: Mar 2001
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posted 07-02-2002 08:35 AM
Be sure the tailpipes are not rubbing anything, a finger width of clearance.------------------
Stuart MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package
Currie 9 Inch
91 f-150 xlt
98 explorer xlt sohc v-6
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rockafellz
Gearhead Posts: 1312
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 07-02-2002 11:18 AM
ccode67, nope no tailpipes are touching.V8 Thumper, the humming or howling appears upon both acceleration and low speed deceleration. Could a pinion bearing be that loose? I was thinking about that last night and figured that the u-joints would compensate for the increased angle (if an increased angle were actually the case). Could anyone else 2nd thumper and our's assumption? Thanks in advance. Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored
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Hemikiller
Gearhead Posts: 395
From: Clinton, CT
Registered: Feb 2002
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posted 07-02-2002 12:26 PM
Make sure that the front hanger isn't bent in touching the spring, since you hammered the bolts out. Second, do these new springs have rubber, polyurethane, or aluminum front eye bushings? Anything of a higher durometer than the original rubber will transmit more / different sounds into the unit body of the car. Third, double check your u-joints, if they were bad, and the pinion angle changed, then they are wearing in a different spot and will make more noise.
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rockafellz
Gearhead Posts: 1312
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 07-02-2002 02:42 PM
Hemi,The front hanger is only touching the metal tubing inside of the rubber bushing. The rubber and body of the leaf spring isn't touching the frame. The black rubber bushings in both front and back of the new leaf springs were VERY HARD. We'll be changing front/rear u-joints sometime this week. I also have an 8" trac-loc that just needs to be assembled which i'll hopefully put in within the next couple of weeks. The sound is loud at low speed accel/decel and seems to quiet down a little at higher speeds. Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored
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rockafellz
Gearhead Posts: 1312
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 07-03-2002 10:11 AM
TTT 
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 07-03-2002 07:57 PM
Change the U-joints and go from there. ------------------
'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
Pics
MCA Member # 47773
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Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
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posted 07-07-2002 01:50 AM
Before I started replacing things, I would use a magnetic angle finder and determine the pinion angle.
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Fastymz
Moderator Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 07-07-2002 01:51 PM
Erik thats the same sound my old 3rd member use to make.And when I replaced it,almost 1/3 of the ring gear teeth were chipped.I put the new 3rd member in and no more noise.
I'd do the ujoints 1st too they need to be changed any ways. How do you like the ride of the 5 leaf and dose the body still dip any? SCOOP ------------------
65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Crager SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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rockafellz
Gearhead Posts: 1312
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 10-01-2002 12:56 PM
TTT Hey Calcat, where can I find one of those angle finder tools? I'll give Kragen a call later. Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored
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Mpcoluv
Gearhead Posts: 975
From: Charlotte NC usa
Registered: Apr 2001
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posted 10-01-2002 06:13 PM
quote:
Originally posted by rockafellz:
TTT Hey Calcat, where can I find one of those angle finder tools? I'll give Kragen a call later. Erik
Sears or any Home depot/Lowes etc... should have a magnetic angle finder.
It sort of looks like a right angle square with a dial indicator in it.
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