Standard Control trac operation
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Cross-Country
Joined: Feb 2007
Posts: 80
Likes: 0
From: Everett, WA
Standard Control trac operation
Quick question to those in the know. I have a 95 Ex with Control Trac, and I am wondering if someone can tell me if under normal operations the front drive shaft should spin when the T-case or selector **** is in 2wd. T-case was rebuilt about 5K ago, with a new shift motor. I recently replaced the rear speed sensor in the t-case to solve the flashing 4x4 lights, and when I was under the vehicle which happened be on 4 jack stands, I spun the rear drive shaft, and the front one turned as well. Vehicle was in "2wd" per the ****. I was under the impressions that 2wd meant only the rear output turned, but maybe the Control Trac is different.
Thanks in advance.
Thanks in advance.
Tuned
Joined: Dec 2012
Posts: 420
Likes: 112
The transfer case has an electric ball ramp clutch to spin the front axle. It is off in 2wd. in auto it is 5%(if no wheel slip) and electrically locked on in low. There may be a bit of drag on the clutch when off to spin the driveshaft with very minimal torque. Probably you can hold the front axle and it will stop. But that is a good question.
The front axle also has a break on the pass side controlled by vacuum, so there could never be 4wd action in 2low. When you turn the selector, the computer applies vac to a solenoid and locks in the pass wheel. That same solenoid is still used on F150s, but they have a different vac lock system (it is in the hubs).
This also creates almost no load on the front driveshaft, so even a tiny load on the clutch will make it spin.
That is what makes a 95-96 different from any explorer until 2020.
The front axle also has a break on the pass side controlled by vacuum, so there could never be 4wd action in 2low. When you turn the selector, the computer applies vac to a solenoid and locks in the pass wheel. That same solenoid is still used on F150s, but they have a different vac lock system (it is in the hubs).
This also creates almost no load on the front driveshaft, so even a tiny load on the clutch will make it spin.
That is what makes a 95-96 different from any explorer until 2020.
Fleet Mechanic
Joined: Aug 2002
Posts: 1,899
Likes: 29
From: Raleigh USA
The transfer case has an electric ball ramp clutch to spin the front axle. It is off in 2wd. in auto it is 5%(if no wheel slip) and electrically locked on in low. There may be a bit of drag on the clutch when off to spin the driveshaft with very minimal torque. Probably you can hold the front axle and it will stop. But that is a good question.
The front axle also has a break on the pass side controlled by vacuum, so there could never be 4wd action in 2low. When you turn the selector, the computer applies vac to a solenoid and locks in the pass wheel. That same solenoid is still used on F150s, but they have a different vac lock system (it is in the hubs).
This also creates almost no load on the front driveshaft, so even a tiny load on the clutch will make it spin.
That is what makes a 95-96 different from any explorer until 2020.
The front axle also has a break on the pass side controlled by vacuum, so there could never be 4wd action in 2low. When you turn the selector, the computer applies vac to a solenoid and locks in the pass wheel. That same solenoid is still used on F150s, but they have a different vac lock system (it is in the hubs).
This also creates almost no load on the front driveshaft, so even a tiny load on the clutch will make it spin.
That is what makes a 95-96 different from any explorer until 2020.
Tuned
Joined: Dec 2012
Posts: 420
Likes: 112
They happen to be the most reliable explorers. No SOHC engine. The 4 speed trans in the v6 (which is more reliable because the 5spd works the 4sp transmission harder to get more gears,lots of issues, but even so it isn't the best transmission). Very likely to see 3-400K. Also if you leave in 2wd most of the time there is no wear and tear on the front end.
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