I have a 1999 ranger with auto trans and 3.0 that sometimes shuteres when you come to a stop. Whats is causing this?

 

where does the sound seem to be coming from, front, rear, underneath? That would help in finding out what is wrong with it.

 

There is no sound. You can feel it. And its not the brakes. It feels like the motor is trying to stall out .

 

The torque converter might be staying locked, does it do the same thinkg when stopping from a slow speed, under 20mph?

 

no its seames to do it when you get above 45 and then come to a stop.

 

I would start by pulling the codes and doing the following tests.

Shift Point Road Test

This test verifies that the shift control system is operating correctly.

1. Bring engine and transmission up to normal operating temperature.

2. Operate vehicle with transmission selector in (D) range.

3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages; refer to Shift Speeds chart. Also refer to Automatic Transmission Specifications booklet.

4. Stop the vehicle. Depress transmission control switch (TCS) to activate D range. Repeat Step 3. Transmission will make all upshifts except 3-4 and torque converter clutch apply should occur above 46 km/h (27 mph).

5. Press accelerator pedal to the floor, wide open throttle (WOT). Transmission should shift from third to second, or third to first, depending on vehicle speed, and torque converter clutch should release.

6. With vehicle speed above 48 km/h (30 mph), move the selector lever from D range to 1 range (LOW) and release accelerator pedal. Transmission should immediately downshift to second gear. When vehicle speed drops below 32 km/h (20 mph), transmission should downshift into first gear.

7. If the transmission fails to upshift/downshift or torque converter clutch does not apply/release, refer to «Diagnosis by Symptom» in this section for possible causes.

Torque Converter Operation Test

This test verifies that the torque converter clutch control system and the torque converter are operating correctly.

1. Carry out Quick Test; refer to On-Board Diagnostics With Scan Tool in this section. Check for DTCs. Refer to Diagnostic Trouble Code Chart.

2. Connect a tachometer to the engine.

3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.

4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.

5. Engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, refer to Torque Converter Operation Concerns in the Diagnosis by Symptom Index.

6. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, refer to «Diagnosis by Symptom» — Torque Converter Clutch Operation Concerns in this section. Repair as required. If the vehicle does not stall in (D), refer to «Diagnosis by Symptom» in this section.