- The OE unit is vacuum controlled. This vacuum system
is prone to failure due to frozen diaphragm, loss of vacuum, hard
or cracked vacuum hoses, or complete loss of vacuum lines.
- The OE unit can cause excessive wear on the
differential and/or right axle and shift fork breakage due to
incomplete engagement or disengagement.
19832001 S-10, S-15 Pickup, Blazer, Jimmy
19851993 1500-3500 Pickup,
Ramcharger, & Trailduster
19942001 Ram 1500 Pickup
19942002 Ram 2500, 3500
19871995 Wrangler YJ
19841991 Cherokee XJ
19861991 Comanche MJ
19972003 F-150 Pickup
- The colder the temperature, the longer it will
take to engage.
- If the front differential becomes submerged, the
TLA temperature will cool and the 4-wheel drive will disengage.
- The TLA unit can cause excessive wear on
internal components in the differential and may cause other electrical
1988-98 Chevy/GMC K1500, K2500,
1992-98 Suburban, Tahoe, Yukon
The failure prone vacuum actuator is replaced
with the cable operated 4x4 Posi-Lok system. The vacuum actuator
is removed from the front axle tube. Engaging the transfer case
and pulling the Posi-Lok handle will slide the shift fork and collar
to connect the freewheeling right axle to the driven left axle.
Both front wheels are now engaged and pulling the vehicle.
The failure prone thermal linear actuator
is replaced with the cable operated 4x4 Posi-Lok system. The cables
handle is conveniently routed under the dash. Placing the vehicles
transfer case in 4-wheel drive and pulling the Posi-Lok cable handle
slides the shift fork and collar to connect the freewheeling right
axle to the driven left axle. Both front wheels are now engaged
and pulling the vehicle.