Subscribe to a magazine

1976 Jeep CJ7 - Going Slow - Tech

Intallment
Posted July 1, 2002

Dana 20 TeraLow Gear Install

For hard-core 'wheeling, slower speeds mean greater control and less strain on your drivetrain. However, hard-core 'wheeling also means big tires, which can drain your horsepower and drop your torque curve, leaving your engine sputtering the slower you go.

Swapping in lower (numerically higher) gears into the axles will certainly help you regain some of that lost power and low-speed control, but it may not get you far enough. Also, lower axle gears mean you turn higher rpm on the highway, which can leave your engine spinning a little too fast.

One great answer to this dilemma is changing out the internal gears in your transfer case. This can let you retain good road manners in 1:1 High range and still leave you with the low trail gearing you need - the best of both worlds.

The stock Dana 20 transfer case found in a lot of Jeeps, Scouts, and Broncos is a sturdy and reliable unit. However, its Low-range gear ratio is only 2.03:1. Tera Manufacturing sells a replacement gearset that can convert the stock Low-range ratio to a much more trail-friendly 3.15:1, a gear reduction improvement of 55 percent.

The TeraLow gearset is a complete upgrade kit that includes five replacement gears, thrust washers, an intermediate shaft, needle bearings, and all the necessary seals and gaskets required to complete the installation. The kit is made in two versions for the Dana 20. The Low20 kit uses a six-spline input gear designed for use with factory manual transmissions. The Low20-Auto kit uses a 15-spline input gear for use with the factory automatic transmission.

We ventured to Off Road Unlimited in Mesa, Arizona, to watch the TeraLow kit being installed in a '76 Jeep CJ-7 equipped with a T-18 manual transmission. Robert Brownlee, resident gear guru, showed us the steps involved in tearing down and rebuilding the Dana 20 transfer case.

When The Need For Strength Is Absolute And Every Inch Counts Pro Rock 60*Even More Clearance than a Dana 44! *30% More Clearance than a stock Dana 60 and a MASSIVE reduction in pumpkin bulk below the axle centerline *Highest Quality and American Made, Dynatrac offers the ultimate axle for your rig*40% More Strength than ANY other Dana 60 type housing on the market

Legendary Dynatrac Quality*Exclusive One Year Written Warranty*115-Point Quality Assured Manufacturing Process*All NEW Parts and Assemblies*Made in the U.S.A.*Call Us Today for Competitive Prices

Dana 20 ApplicationsFord: '66-'77 BroncoInternational: '65-'72 Scout 800; '71-'79 ScoutJeep: '72-'79 CJ

Sources

Off Road Unlimited
www.offroadunlimited.com
Tera Manufacturing Inc.
Sandy, UT 84070

Comments

Advertisement