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Toyota Rear-Axle Beef-Up

129 0012 Beef 01 Z
Jay Kopycinski | Writer
Posted August 11, 2004

Options for the hard-core user

The Toyota rear axle is a versatile unit. With the wide array of upgrades and options available for it, customizing it to your needs is easy. Also, the stamped steel housing easily accepts welded components such as track bars or link mounts.

Toyota truck and 4Runner rear axles are plenty tough in stock form, but there are a number of upgrades available that can make them even tougher for hard-core users. In a previous article ("Toyota Axle Beef," June '99) we discussed fortifying front axles. Here we'll discuss the other end of your Toy, and a few pieces in between.

Basically two versions of 8-inch rear axles have been used over the years. Production rear axles through the 1985 model year (those with a straight front axle) measure 55 inches flange to flange. When Toyota changed to IFS in 1986, its engineers widened the rear axle to 58 inches to match the wider front suspension.

Ratios by Year
1979 4.10:1
1980 4.38:1
1981 3.{{{90}}}:1
1982-1984 4.10:1
1985-1988 4.10:1, 4.30:1, 3.42:1 (turbo)
1988-1994 4.10:1, 4.30:1, 4.56:1, 4.88:1
1995 3.91:1, 4.10:1
{{{Tacoma}}} 3.42:1, 3.91:1, 4.10:1

Along with widening the axle, Toyota engineers also increased the tube diameter from 65mm to 80mm in diameter, and increased the drum-brake size. The axle shafts were lengthened 1.5 inches per side, but the third members are completely interchangeable between the early and later years, through 1995 when Toyota changed the axle for the Tacoma.

The differentials that came in turbo-engine-equipped trucks, or in V-6 trucks, contain four spider gears as opposed to two spiders on the four-cylinder versions. This is often not significant as lockers or other traction aiding devices are added, replacing the stock carrier. However, the V-6 third-members do carry beefier ring-and-pinion gears than the four-cylinder ones.

Stock Toyota axle ratios have varied over the years, as shown in the following table. Not all gears shown were available in each specific year from 1985 to 1994. Ratios varied based on engine, tire size, and transmission configuration.

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Many rockcrawlers with early-model narrow-track axles have opted to swap in the later wide-track axles to widen tire stance and prevent the inside face of the rear tires from rubbing on the frame rails under extreme articulation. Swapping to the newer axle is a bolt-on affair.

In any case, Toyota rear axles are versatile and reliable performers. With the wide availability of aftermarket beef-up parts, and a number of stock interchange options, you can set up your truck or 4Runner to tackle the four-wheeling you do.

Sources

Marlin Crawler
Fresno, CA 93703
559-252-7295
Downey Off-Road Mfg.
Santa Fe Springs , CA 90670
310-949-9494
All-Pro Offroad
Hemet, CA 92543
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