Lift due to HD vs Normal 110 springs - Defender Source
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Old February 21st, 2014, 09:57 AM
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Michael White
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Lift due to HD vs Normal 110 springs

Hi all,

My 110 is a three door FFR and it's always had a bit of noise on mild deceleration (e.g. when I slightly lift the pedal down hill) due to what I'm guessing is the pinion angle, currently at 7.5 degrees. It doesn't take much to stop the noise- usually rear passengers or some other weight right in the back brings the pinion angle down enough.

There's no suspension lift, but when I bought new springs I kept the spring configuration the way I bought it - normal duty springs in the front and heavy duty springs in the rear. Now I'm wondering if putting heavy duty springs in the front would bring the pinion angle down to under 7 degrees (the number I've been told to shoot for).

For a 110, the circumference of a circle centered on the rear axles and measured at the front axles would be:

2 x (pi) x 110 = 691 inches

691 is nearly double 360, so an inch change at the front should amount to about half a degree change.

Does anyone know how much (if any) lift heavy duty springs would give me in the front over normal duty springs?

Thanks.
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  #2  
Old February 21st, 2014, 10:04 AM
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John B.
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Pinion angle on the rear axle? It should be fairly flat and not change much with lift. The front points at the transfer case and stays that way with lift.

Perhaps you are meaning something else.

A "noise" on overrun is usually a bad u-joint.
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Old February 21st, 2014, 10:13 AM
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If it is indeed pinion angle, then longer rear arms (or shims on the existing rear arms) would be more effective at altering the pinion angle.

Altering the front springs to change the rear pinion angle seems inefficient and unlikely to fix the issue. It would also likely introduce additional issues.
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  #4  
Old February 21st, 2014, 10:37 AM
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Michael White
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Quote:
Originally Posted by Red90 View Post
Pinion angle on the rear axle? It should be fairly flat and not change much with lift. The front points at the transfer case and stays that way with lift.

Perhaps you are meaning something else.

A "noise" on overrun is usually a bad u-joint.
I guess you're right - the rear axle would tilt along with everything else due to the rear links.

Next free time I've got, I'll swap out the U-joints. They're probably due anyway - I have no idea of their history.

Thanks!

------ Follow up post added February 21st, 2014 09:39 AM ------

Quote:
Originally Posted by sonoronos View Post
If it is indeed pinion angle, then longer rear arms (or shims on the existing rear arms) would be more effective at altering the pinion angle.

Altering the front springs to change the rear pinion angle seems inefficient and unlikely to fix the issue. It would also likely introduce additional issues.
Yeah, I didn't think it through. I forgot about the rear arms, and everything would tilt with them. I'll look into shims instead.
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