Yo JWC,
WELCOME!
Ford typically builds 4WD trucks with a slightly numerically lower front gear ratio than the rear so that off-road steering is enhanced. So a truck built with
3.55 rear gears will have 3.54 front;
3.08 rear - 3.07 front;
4.11 rear - 4.10 front, etc..."
Following was in my MS WORD Notes and the source, Randy's Ring & Pinion has removed it from their current web site;
The gear ratio in the front of a four wheel drive has to be different from the front so the front wheels will pull more in 4 wheel drive. There have been many different ratio combinations used in four-wheel drive vehicles, but not so that the front will pull more.
Gear manufactures use different ratios for many different reasons. Some of those reasons are: strength, gear life, noise (or lack of it), geometric constraints, or simply because of the tooling they have available.
I have seen Ford use a 3.50 ratio in the rear with a 3.54 in the front,
or a 4.11 in the rear with a 4.09 in the front.
As long as the front and rear ratios are within 1%, the vehicle works just fine on the road, and can even be as different as 2% for off-road use with no side effects. point difference in ratio is equal to 1%.
To find the percentage difference in ratios it is necessary to divide, not subtract. In order to find the difference, divide one ratio by the other and look at the numbers to the right of the decimal point to see how far they vary from 1.00.
For example: 3.54 · 3.50 = 1.01, or 1%, not 4% different.
And likewise 4.11 · 4.09 = 1.005, or only a 1/2% difference.
Also These differences are about the same as a 1/3" variation in front to rear tire height, which probably happens more often than we realize.
A difference in the ratio will damage the transfer case. Any extreme difference in front and rear ratios or front and rear tire height will put undue force on the drive train. However, any difference will put strain on all parts of the drivetrain. The forces generated from the difference have to travel through the axle assemblies and the driveshafts to get to the transfer case. These excessive forces can just as easily break a front u-joint or rear spider gear as well as parts in the transfer case.
◇⊙£
For a YARD SEARCH on-line, I use;
Quality Replacement Parts | Find Used Auto Parts | Online Locator
A yard that uses Hollander Interchange can search other yards and have it shipped
including some Canadian yards.
"...For over eighty years, Hollander has been making the best tool for fast, interchangeable part matches. The new Edition Hollander Interchange contains more interchangeable options than ever before.
The Hollander Interchange provides auto recyclers and auto collectors, rebuilders, and others with the easiest and most comprehensive solution for identifying interchangeable auto parts..." See their yard Directory @:
Seller Directory | Used Auto Parts | Hollanderparts
Can select a certain part.
If a specific part isn't listed, search again for the next higher assembly, such as in this instance, the tailgate.
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or
Car-Part.com--Used Auto Parts Market
Can select certain parts
Can search by year range, such as 92 through 96 & has best item condition descriptions such as "COVER BAD LEATHER PWR BKT GRY"
Has Vehicle Pics for some vehicles incl. interior/dash, back seat, front & rear and engine bay
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Bronco Used Part Search @ Ford Bronco Parts | Used Auto Parts with source, cost, yard and phone #
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Concord Spare Parts @ Spare parts for your cars, trucks and special vehicles
732-374-3872
[email protected]
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Home | Pick-n-Pull
This is a Company name w/yard locations in various states
Can NOT Select certain parts
Has Vehicle Pics for some vehicles
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B&R Autowrecking, in CA, WA, NV, OR. "We have a fleet of over 60 trucks that deliver to business addresses all over Oregon and Washington. Outside of Oregon and Washington, we have daily shipping services. Contact Us for a quote."
"Will ship to their closest yard for $50 flat" by StemCellResearch", 2019
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Row52
Can NOT Select certain parts
Has Vehicle Pics for some vehicles
AND Want a Part? It's Easy...
1. You create a Parts Wanted Listing.
2. Parts Pullers respond with offers.
3. You pick the best one.
A Parts Puller gets the parts you need.
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1981 Bronco Dealer Brochure by Gary @
1981 Bronco Brochure - Gary's Garagemahal (the Bullnose bible)
1980-1986 Bronco/F Series Fasteners by Gary
1980-1986 Bronco/F Series Carburetors, Chokes & EFI by Gary
1980-1986 Bronco/F Series Specifications by Gary @
Axle Ratios - Gary's Garagemahal (the Bullnose bible)
Differences in 1980-1986 Bronco/F Series by Gary
1981 Bronco/F Series Electrical & Vacuum Troubleshooting Manual (EVTM), partial via Gary @
1981 EVTM - Gary's Garagemahal (the Bullnose bible)
EEC III Testing, etc @
Wayback Machine by Tommy
Partial Chilton Manual for 1978, 1979, 1980, 1981 Bronco. Scanned by broncocity.com @
Bronco City
1981 Bronco Advertisement @
Ads0002.jpg
GL J!
Al