F100 4x4 Diff ratios
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Senior User
Joined: Mar 2007
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From: Australia
F100 4x4 Diff ratios
Hi All,
A technical question re differential ratios.
I have two 4x4's.
1. 1972 4x4 Falcon Utility. Front ratio 4.10:1 Rear ratio 4.0:1
2. 1986 F100 LWB. Front and Rear ratio 3.50:1
I recently purchased a complete front diff for the F100 with ARB air locker but with 3.54:1 ratio.
My question is given that the 1972 Falcon has .1 difference between the ratios would there be a problem with the .04 difference between the ratios in the F100.
I can see no real issue other than an absolute miniscule amount of wheel slip/spin from the front wheels. Have not noticed this at all in the Falcon with the greater difference in ratios.
Any toughts or comments greatly appreciated.
Just trying to save having to completely disassemble two diffs to change over the air locker.
Regards
Ross
A technical question re differential ratios.
I have two 4x4's.
1. 1972 4x4 Falcon Utility. Front ratio 4.10:1 Rear ratio 4.0:1
2. 1986 F100 LWB. Front and Rear ratio 3.50:1
I recently purchased a complete front diff for the F100 with ARB air locker but with 3.54:1 ratio.
My question is given that the 1972 Falcon has .1 difference between the ratios would there be a problem with the .04 difference between the ratios in the F100.
I can see no real issue other than an absolute miniscule amount of wheel slip/spin from the front wheels. Have not noticed this at all in the Falcon with the greater difference in ratios.
Any toughts or comments greatly appreciated.
Just trying to save having to completely disassemble two diffs to change over the air locker.
Regards
Ross
Senior User
Joined: May 2007
Posts: 274
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Howdy, I never knew that the diff ratios weren't the same in the Falcon. My father has a '72 XY that was put aside to become a 4x4 but they never got around to it (lack of sales) so it was sold as a regular ute with the XA locking steering column, high back seats and rectangular mirrors.
Don't know the answer about the different ratios for the F100, but if the factory had the same ratios it is probably for a good reason. Maybe the XY had to have a different ratio for some reason. It was, after all, Jeep running gear.
Don't know the answer about the different ratios for the F100, but if the factory had the same ratios it is probably for a good reason. Maybe the XY had to have a different ratio for some reason. It was, after all, Jeep running gear.
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My question is given that the 1972 Falcon has .1 difference between the ratios would there be a problem with the .04 difference between the ratios in the F100.
