Is it possible to replace the 4-speed with a transmission with Overdrive on a 1979 Ford 400 motor?

It's possible, but it wouldn't hold up very long. A 400 is a high torque but low horsepower motor and most tranny's won't take high torgue levels A 400 is a high horse and torque motor, I have one in my 250. Yes its possibel, anything is possible if you have the time and money.

Truthfully the fuel economy should improve if you use the overdrive. I know my uncle had a truck that was set up for overdrive and he put a 4 speed tranny in and the fue economyl was horrible. Either way let me know how it turns out, I was thinkin wether or not to put a 5 speed in mine.

In 5 forward gears, 5th being overdrive. Ranger system roughly $700-1000 less costly. Doubling available ratios.

Ranger plus granny 4 speed noisier than NV4500. NV4500 is a more civilized trans. Directly to the specified transmission and matching bellhousing with only minor modifications.

Driveline and floorboard modifications are required. 5.125" index diameter. 1971-1987 Ford Overdrive.

4.848" index diameter. Directly to the 4 speed and bellhousing with only minor modifications. Between a GM 4speed bellhousing and the stock LC 4speed transmission.

Can be installed on 1987 and newer Land Cruisers. Have found a few odd size input shaft bearings that Toyota used. Transmission must be measured.

Is 3.625", a special rear plate can be machined for this application. The overdrive design for the Land Cruiser makes an ideal conversion. This engine by using a stock Toy LC 3sp bellhousing.

Of custom machining on the Ranger). Stock 4speed, stock 3 speed. Looks like H55 5speed should work.

T18,T19 or NP435. Driveshaft length - this will move your Tcase back appx 7 inches.

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