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Old Jan 22, 2006 | 08:18 AM
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rearend gears

what rearend gears did 1977 f150 4x4 come with? thanks
 
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Old Jan 22, 2006 | 08:23 AM
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There should be a tag on one of the rear end housing bolts with some coded information. If you could check that and post the numbers, I'm sure someone could decipher it for you.

There were various gear ratio's available. One quick and reasoably accurate check is to count the wheel revolutions and compare them to the drive shaft revolutions. Four revolutions of the tire vs. one revolution of the driveshaft would be a 4 to 1 ratio.

The most accurate method would be of course to count the teeth on the ring gear and divide it by the number of teeth on the pinion gear.....
 
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Old Jan 22, 2006 | 08:25 AM
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The most common ratio I've seen is a 3.50 ratio.
 
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Old Jan 22, 2006 | 10:22 AM
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Dave is right about the tag, get the numbers and post them up and we could tell you if you have a Limited slip or not and what gear.
RTM is right, I've never seen a F-150 4x4 come with anything other than 3.50 gears.
 
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Old Jan 22, 2006 | 11:17 AM
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Originally Posted by MBBFord
I've never seen a F-150 4x4 come with anything other than 3.50 gears.
My 79 had 3.0's in it.
 
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Old Jan 22, 2006 | 11:35 AM
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In a stock 4wd?
 
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Old Jan 22, 2006 | 11:54 AM
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Yes sir. Axle code on the door jamb matched that too, they were stock. 79 F150 full time 4x4.
 
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Old Jan 22, 2006 | 12:00 PM
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Never knew that. Don't supose you would know off hand if all full time 4x4s came with 3.00 gears, huh?
 
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Old Jan 22, 2006 | 12:18 PM
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there`s no tags on rear end,i will try some of your suggestions,thanks for the info
 
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Old Jan 22, 2006 | 12:23 PM
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Is door jamb sticker still readable? Look up axle code.

Pat
 
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Old Jan 22, 2006 | 02:43 PM
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axle code 16 thanks
 
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Old Jan 22, 2006 | 04:17 PM
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cwpitman, I am in the same shape! No tag but a code of 14J...Anyone?? It appears to be a 3.08:1 ratio.
 
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Old Jan 22, 2006 | 05:11 PM
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Yes a full time 4x4 may more than likely have the 3.00 gears and I have read that it was more common to find 3.00 in full time 4x4's than than finding 3.50 gears. I do have a 78 bronco with 3.50 gears and it is a full time set up. I haven't seen to many full time set ups running around either so they are even hard to find or they are around here.
 
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Old Jan 22, 2006 | 10:14 PM
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Originally Posted by cwpitman
axle code 16 thanks
that code is for 3.50:1. i believe limited slip i could be wrong on that the book is kind of confusing.

Originally Posted by broncman
cwpitman, I am in the same shape! No tag but a code of 14J...Anyone?? It appears to be a 3.08:1 ratio.
that code is for 3.00:1 also could be limited slip according to the book. the J is for power steering.
 
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Old Jan 23, 2006 | 09:08 AM
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thanks for all your input
 
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