Positive Actuating Device Engages 4-WD On GM Pickup
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Charlie Stough, Thermopolis, Wyo.: "There are many problems with the thermal linear actuator used to engage the 4-WD on late 1980's GM pickups through current models. It's an electro-mechanical part with an atrocious failure record. GM replaces over 100,000 a year. There are a few replacement parts on the market but they, too, are mechanically complicated so they're hard to install, not very reliable, and relatively expensive.
"We've come up with a solution to the problem. It's called the PAD (positive actuating device), a non-mechanical, static unit that's guaranteed for life. It replaces the thermal linear actuator. After installation, both front axles turn at all times, even in 2-WD. The front driveshaft is constantly engaged at the front differential, but disengaged at the transfer case until you activate 4-WD. This doesn't cause additional wear to U-joints or front driveline and you shouldn't notice any real drop in gas mileage.
"Any shade tree mechanic can install a PAD in 10 or 15 minutes. They sell for $64.99."
Contact: Precision Auto Parts, 210 Suite 4, Highway 20 South, Thermopolis, Wyo. 82443 (ph 307 864-3490).
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Positive Actuating Device Engages 4-WD On GM Pickup PICKUPS Accessories 21-2-34 Charlie Stough, Thermopolis, Wyo.: "There are many problems with the thermal linear actuator used to engage the 4-WD on late 1980's GM pickups through current models. It's an electro-mechanical part with an atrocious failure record. GM replaces over 100,000 a year. There are a few replacement parts on the market but they, too, are mechanically complicated so they're hard to install, not very reliable, and relatively expensive.
"We've come up with a solution to the problem. It's called the PAD (positive actuating device), a non-mechanical, static unit that's guaranteed for life. It replaces the thermal linear actuator. After installation, both front axles turn at all times, even in 2-WD. The front driveshaft is constantly engaged at the front differential, but disengaged at the transfer case until you activate 4-WD. This doesn't cause additional wear to U-joints or front driveline and you shouldn't notice any real drop in gas mileage.
"Any shade tree mechanic can install a PAD in 10 or 15 minutes. They sell for $64.99."
Contact: Precision Auto Parts, 210 Suite 4, Highway 20 South, Thermopolis, Wyo. 82443 (ph 307 864-3490).
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