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Early Bronco Transfer Case Parts
All 66-77 Broncos came with the Dana 20 transfer case. The most notable differences between the Bronco Dana 20s are the early version 66-72 known as the T-shift with 2.46 low gear, verses the J-shift which was used from 73-77 and has a 2.34 low gear.
Early 66's had a round shift knob. Later 66-72 used the T-shifter which has a push button T-handle. All 66-72s shift in a straight up and down pattern while the 73-77 used a J-shifter. It has a backwards J-shift pattern. Front output shaft and bearings, shift rails and detents are also different from early to later Dana 20s.
Example 1: NP 435 first gear is 6.69 x 2.34 in your T-case x 4.11 ring and pinion = 64.34 which we would call 64 to 1. Not bad.
Example 2: Now let's throw in a Dual T-case. NP 435 first gear is 6.69 x 2 in your Super Crawler x 2.34 in your T-case x 4.11 ring and pinion = 128.68 or 128 to 1.
Early 66's had a round shift knob. Later 66-72 used the T-shifter which has a push button T-handle. All 66-72s shift in a straight up and down pattern while the 73-77 used a J-shifter. It has a backwards J-shift pattern. Front output shaft and bearings, shift rails and detents are also different from early to later Dana 20s.
Dana 20 Rebuild Kits
WILD HORSES kits include all the bearings needed to build your early and later model Dana 20. Yes, you will end up with 2 bearings you don't use but this way there is no chance of coming up with the wrong bearings on rebuild day! We offer 3 levels of rebuild kits. The basic kit includes gaskets, seals and bearings. The deluxe kit adds a new cluster shaft with thrust washers and shims. The super deluxe kit has all of the above plus the adapter housing bearing.Gear Ratio Calculation
How low can you go? Take the lowest gear in your transmission and multiply that by the low gear in your t-case and then by your ring and pinion gear.Example 1: NP 435 first gear is 6.69 x 2.34 in your T-case x 4.11 ring and pinion = 64.34 which we would call 64 to 1. Not bad.
Example 2: Now let's throw in a Dual T-case. NP 435 first gear is 6.69 x 2 in your Super Crawler x 2.34 in your T-case x 4.11 ring and pinion = 128.68 or 128 to 1.
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WILD HORSES 4X4: The Trusted Source for Ford Bronco Parts & Accessories
| Frequently Asked Questions |
Does WILD HORSES 4x4 carry parts for my 66-77 Ford Bronco?
Yes. WILD HORSES 4x4 carries every part you need to completely build or restore your 1966–77 Ford Bronco. Each component is carefully tested for fitment and quality to ensure proper compatibility across all early Bronco models. Check out our 66-77 Ford Bronco Parts category for all your Early Bronco parts and accessories.
How about other year models of Ford Bronco?
You bet! We offer parts and accessories for all generations of the Ford Bronco. We are expanding our offering of full-size Ford Bronco (and truck) parts on a daily basis, with a particularly strong focus on expanding our 78-79 Ford Bronco parts offering. We also have an expansive selection of parts and accessories for the new sixth generation 2021+ Ford Bronco.
Does WILD HORSES 4x4 specialize in Bronco restorations?
Absolutely. We specialize in full Bronco restorations and upgrades, offering premium-quality parts, assemblies, and technical support to help you build or restore your classic Ford Bronco with confidence. Many of our team members have restored and upgraded their own personal Ford Bronco and can provide invaluable support as you go through your own restoration process.
What makes WILD HORSES 4x4 the Bronco off-road experts?
Our team lives and breathes Broncos. With decades of experience in early Bronco restoration, customization, and trail performance, WILD HORSES 4x4 is recognized as the Bronco off-road authority—trusted by enthusiasts across the country.
Can I return a Bronco part if it doesn’t fit or I change my mind?
Yes. If your part doesn’t fit or you need to make a return, we make the process simple. Most products can be returned within 60 days when items are in their original condition. Please review our complete policy on our Returned Merchandise & Refund Policy.
Does WILD HORSES 4x4 offer technical support for installations?
Yes. Our in-house tech team provides expert installation and troubleshooting support for every product we sell. Whether you’re working on a full restoration or a weekend upgrade, we’re here to help get your Bronco back on the road or trail fast.
Where can I find official WILD HORSES 4x4 promo codes and discounts?
Official WILD HORSES 4x4 promo codes are only offered during select events and holidays. When a promo code is active, it will be announced on our home page and applied during checkout. You can always find current deals, event sales, and discounted parts on our Promo Codes page, including seasonal sales and category-specific discounts.