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Having problims 2001 gmc c6500 with at545rm Allison always

Customer Question
in reverce you put...
having problims 2001 gmc c6500 with at545rm Allison always in reverce you put shifter in any gear always reverce
JA: What is the complete model and serial number of your machine?
Customer: 1gdg6h1ex1j508134
JA: Are you fixing this yourself? What have you tried so far?
Customer: we put in rebuilt trany and did it from start, sent it back to found solinod stuck they fix up, put back in truck same thing in reverce all time
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: both times it drive out of shop mybe 300 yds
Submitted: 3 months ago.Category: Medium and Heavy Trucks
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Answered in 18 hours by:
8/5/2017
Technician: Daniel Wilson,
 replied 3 months ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 5,714
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to help. Have them test the pressures in each gear position to see if there may be a problem with internal leakage and also inspect the valve body for sticking valves as well.

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Technician: Daniel Wilson,
 replied 3 months ago

B - ABNORMAL ACTIVITIES OR RESPONSES

Condition Probable Causes Suggested Remedies

Excessive Creep in First and Reverse Ranges1. Engine idle speed set too high.1. Adjust to correct idle speed. (Refer to vehicle service manual.)

No Response to Movement of Shift Selector Lever.2. Shift selector linkage unhooked.2. Connect linkage - shift selector gates must agree with model. Detent positions at transmission must conform with gates on shift selector. (Refer to vehicle service manual.)

3. Shift selector linkage defective.3. Repair or replace linkage. Shift selector linkage must be free and secure.

4. Main pressure low.4. Refer to Chart E, Low Pressures.

5. Shift selector not engaged at selector valve.5. Replace defective part. (Refer to applicable service manual.)

6. Transmission fluid level low.6. Fill to proper level. (Be sure dipstick calibration is correct for specific model.)

Vehicle Moves Forward in Neutral7. Shift selector linkage out of adjustment, defective, or broken.7. Repair or replace linkage. (Check engine idle speed.) Shift selector linkage must be free and secure.

8. Forward clutch failed and dragging.8. Rebuild forward clutch.

Vehicle Moves Backward in Neutral9. Shift selector linkage out of adjustment, defective, or broken.9. Repair or replace linkage. Shift selector linkage must be free, and secure.

10. Fourth clutch failed and dragging (third clutch in V 730).10. Rebuild clutch.

Reverse Warning Buzzer and/or Vehicle Backup Lights Come on During Forward Operation11. Improper 1-2 relay valve installed.11. Install new 1-2 relay valve

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Technician: Daniel Wilson,
 replied 3 months ago

A - ABNORMAL SHIFTS ALL MODELS

ConditionProbable CausesSuggested Remedies

Shifts Occur at Too High Speed1. Governor valve malfunctioning (stuck).1. Clean or replace governor screen and/or governor.

2. Vacuum modulator vacuum hose to engine kinked or leaking - light throttle shifting delayed.2. Replace hose. Be sure vacuum line is free from kinks or bends and not close to exhaust components.

3. Modulation delayed (vacuum).3. Replace vacuum modulator. Be sure that O-ring is installed.

4. Mechanical actuator cable kinked, broken or not properly adjusted.4. Replace, adjust, or repair cable. Full actuator control cable travel must correspond with full throttle.

5. Mechanical actuator malfunctioning.5. Replace actuator.

6. Shift signal valve adjustment too high.6. Adjust shift speeds. Refer to transmission service manual.

7. Valves sticking.7. Replace or rebuild control valve assembly.

8. Improper Modulator.8. Inspect and replace, if necessary, modulator valve and modulator body.

Shifts Occur at Too Low Speed - Full Throttle9. Governor spring weak or missing.9. Replace governor.

10. Mechanical actuator kinked, broken, or not properly adjusted.10. Replace, adjust, or repair cable. Full actuator control cable travel must correspond with full throttle.

11. Shift signal valve spring adjustment too loose.11. Tighten spring adjusting ring to specification.

12. Modulator valve stuck open.12. Check spring adjustment. Clean or replace modulator valve.

Rough Shifts13. Governor valve malfunctioning.13. Clean or replace governor screen and/or governor.

14. Vacuum modulator valve hose kinked or leaking.14. Replace hose, check spring adjustment.

15. Mechanical actuator cable kinked, broken, or not properly adjusted.15. Replace, adjust, or repair cable. Full actuator control cable travel must correspond with full throttle.

16. Mechanical actuator malfunctioning.16. Replace actuator.

17. Vacuum modulator failed.17. Replace vacuum modulator. Be sure that O-ring is installed.

18. Trimmer valves sticking (broken spring).18. Replace or rebuild control valve body assembly.

19. Control valves sticking.19. Replace or rebuild control valve body assembly.

20. Modulator valve sticking.20. Clean valve. Check vacuum modulator.

21. Vacuum modulator valve spring not adjusted properly.21. Adjust spring.

22. Engine idle speed too fast (N (Neutral [ or P (Park), if applicable] to D (Drive)).22. Adjust engine idle screw. (Refer to vehicle service manual.)

23. Selector linkage out of adjustment.23. Adjust linkage.

No Specific Shift; i.e.., 1-2, 2-3, 3-4, 4-5 (Up or Down)24. Governor valve malfunctioning.24. Clean or replace governor screen and/or governor.

25. Specific range valves malfunctioning (sticking).25. Replace or rebuild valve body assembly.

Excessive Engine Flare26. Refer to Chart G.26. Refer to Chart G.

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Technician: Daniel Wilson,
 replied 3 months ago

Verify pressures to isolate an internal problem indicating it will have to be taken apart again for proper repair. Let me know

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Daniel Wilson
Daniel Wilson
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 5,714
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