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Transmitting mechanical power and torque through rotation of the drivetrain has been a primary concern to front-engine/rear-wheel-drive cars from the beginning. Obviously, an engine cannot be directly connected to the rearend due to distance and the relative movement between the transmission and the rearend. Cars are built with other components that bridge the distance to carry torque and power.

Transmission yokes, driveshafts, universal joints, and rearend carriers are there to transmit the power and deal with the stress of input torque and load. Upgrades in the drivetrain are common, as enthusiasts and racers look to avoid adding weight but build strength in the drivetrain as their engine upgrades increase power.

Strange Engineering has been at the forefront in creating many of these drivetrain upgrade components and their new 1350 slip yokes will take care of an often overlooked component in the drivetrain.

Strange two-piece 1350-series transmission yoke for use with Turbo 400 with roller bearing extension housings.  Part number U1678N.

When it comes to power transmitted in the drivetrain, which universal joints are used makes a huge difference in the strength of the drivetrain. This doesn’t necessarily pertain to a brand as much as it does strength. Many automobiles use a 1310 series universal joint and slip yoke. These work great for stock-type daily drivers. Once you start adding engine performance, universal joints with larger trunnions are a necessary upgrade. However, It’s not as simple as buying a bigger universal joint. The yokes that connect to the universal joint must be upgraded to match the larger universal joint.

There are crossover-style U-joints that will allow a quick fit for a larger driveshaft with 1350 weld in yokes to fit together with a 1310 transmission slip yoke. If you plan on doing any weekend time at the local strip or carving a few corners on a local street course, these crossover u-joints are not recommended for a long-term solution.

Knowing slip yokes take a lot of abuse in high-performance applications, Strange’s two-piece 1350-series transmission yoke for GM Turbo 400 with 32-spline output shaft is made from severe duty 4340 billet Chromoly steel. These yokes are designed with U-joint caps instead of the stock-type U-bolt retainers to eliminate distortion of the caps and increase the holding power at the same time. They will pretty much hold up to anything you can throw at them.

Left: Part number U1678. Right: Part numberU1678N.

According to the press release, the two new part numbers (U1678 and U1678N) feature a version for roller bearing tail housings that are sized appropriately and include a special case hardened heat treatment for durability.

Strange two-piece 1350-series transmission yoke for bronze bushing extension housing (part number U1678):

For roller bearing extension housing applications, order part number U1678N for Turbo 400. This yoke features the same specs as above but is induction hardened for use with roller-bearing extension housings.

For more information on this or other drivetrain upgrade components, visit Strange Engineering online at  www.strangeengineering.net.

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