NP435/T18 4-speed to Dana 20 Adapter, 66-77 Bronco

Item #: 8318
This adapter kit will allow you to adapt a New Process NP435 4-speed transmission into your 66-77 Ford Bronco with the factory Dana 20 transfer case. This adapter kit is designed for use with NP435 transmissions out of Ford F100, F200, F300 & 1-ton trucks with the Ford small block bellhousing bolt pattern. The bolt pattern on this adapter is for the 2WD NP435 transmission which has a square bolt pattern.

Fits 66-77 Ford Bronco
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NP435/T18 4-speed to Dana 20 Adapter, 66-77 Bronco
Item #: 8318


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Description

Early Bronco NP435 to Dana 20 Adapter

This adapter kit will allow you to adapt a New Process NP435 transmission into your 66-77 Ford Bronco with the factory Dana 20 transfer case. This adapter kit is designed for use with NP435 transmissions out of Ford F100, F200, F300 & 1-ton trucks with the Ford small block bellhousing bolt pattern. The Ford transmissions will have a 8.5" x 6.25" bellhousing pattern with a bellhousing pilot diameter of 4.848". This adapter is designed for 2WD 28-spline output shafts with a 5.5" to 6" stick out. The bolt pattern on this adapter is for the 2WD NP435 transmission which has a square bolt pattern.

The NP435 4-speed manual transmission is a popular transmission swap for the early Bronco due to its low granny first gear and durable construction. The first gear on the NP435 is an ultra-low 6.69:1 ratio, making it great for rock crawling. Second gear basically matches right up with the factory early Bronco 3-speed transmission first gear. The NP435 second gear ratio is 3.34:1 and the early Bronco stock 3-speed first gear ratio is between 2.99:1 and 3.41:1 depending on whether it is a RAT or RAN transmission. The NP435 transmission was found in many 1966-92 Ford trucks from 1/2-ton to 1-ton.

This adapter kit will also work with T18 4-speed manual transmissions which came in some 68-82 Ford F100-F250's. The T18 transmission setups are about 1-inch longer than the NP435. Typically, no driveshaft modification is necessary with an NP435 setup, but with T18 transmissions slight modification may be required.

NP435 4WD transmissions will have an A-pattern bolt pattern where the lower two holes are farther apart than the upper two holes. For use in the 4WD version, the upper two holes will need to be added to the adapter to match the NP435 pattern. Additional modifications are also necessary to use the 4WD transmission, so we suggest looking to source the 2WD version for ease of installation.

NP435 4-speed Manual Transmission Gearing
  • First Gear: 6.69:1
  • Second Gear: 3.34:1
  • Third Gear: 1.79:1
  • Fourth Gear: 1.00:1

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If the Dana logo is not shown, these parts
are not manufactured or authorized by Dana.

Product Reviews

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NP 435 Transmission Adapter
Sep 12, 2016  |  By Ron Cartwright
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Customer service was awesome. I got the correct part and it was a pleasure doing business with you. Will definitely do business with you again...God Bless

NP 435 adapter
Jan 21, 2014  |  By Jeff
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Super fast shipping. Great product.

Great job
Oct 14, 2011  |  By Matt Simons
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Everything showed up as ordered and in a timely manner, i am very satisfied.

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