I have an 88 Bronco with 302 and aod transmission. Recently my tcase locked up on me. Not realizing it was the tcase, I tried moving the beast under it's own power:/ Before I put a junkyard tcase in I pulled the Trans to replace seals. Now on a cold start it will back out of the carport, but when I put it in drive, it acts like it has a stall converter in it. It will rev to about 2500 rpm then grab. It will do it 1 more time when I pull out on the highway, then is fine the rest of the day. It also does it on hill climbs ( kinda scary). I had added the amount of fluid in my Chiltons manual, but the dipstick shows slight overfill. Will this cause it?
Trans help please
- Thread starter adam13
- Start date
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Rons beast
Active member
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Hey Adam,
Not likely that a slight overfill will cause such a drastic problem. Sounds like a trip to a trans shop is in order.
Almost sounds like the convertor is leaking down overnight.
Not likely that a slight overfill will cause such a drastic problem. Sounds like a trip to a trans shop is in order.
Almost sounds like the convertor is leaking down overnight.
Krafty
New member
you checking your transfluid when at operating temp, and running in park or neutral?
yo ADAM,
As the guys advided; fluid level is first check in this AOD Trouble Shooting, COMPREHENSIVE; "...from the AOD service manual..."
Source: by duanemyhre at http://www.sccoa.com/forums/showthread.php?t=30511
All Upshifts Harsh or Delayed or No Upshifts
Possible Source(s):
§ Improper fluid level.
Action(s) to Take:
§ Perform «fluid level check» .
Possible Source(s):
§ Throttle linkage--misadjusted (high TV)/ disconnected/sticking/damaged/ return spring disconnected.
Action(s) to Take:
§ Adjust throttle linkage. Service as required,
Possible Source(s):
§ Manual linkage--misadjusted damaged.
Action(s) to Take:
§ Check and adjust or service as required.
Possible Source(s):
§ Governor sticking.
Action(s) to Take:
§ Perform «governor test» . Service as required.
Possible Source(s):
§ Main control pressure too high.
Action(s) to Take:
§ «Control pressure test» . Service as required.
Possible Source(s):
§ Valve body bolts--loose/too tight.
Action(s) to Take:
§ Tighten to 9-11 N-m (80-97 lb-in).
Possible Source(s):
§ Valve body dirty/sticking valves.
Action(s) to Take:
§ Determine source of contamination. Service as required.
o Rough/Harsh/Delayed 1-2 Upshift
Possible Source(s):
§ Improper fluid level.
Action(s) to Take:
§ Perform «fluid level check» .
Possible Source(s):
§ Poor engine performance.
Action(s) to Take:
§ Tune engine.
Possible Source(s):
§ TV linkage--misadjusted (high TV)/damaged. All shifts will be harsh/delayed.
Action(s) to Take:
§ Adjust linkage. Service as required.
Possible Source(s):
§ Main control pressure too high.
Action(s) to Take:
§ «Control pressure test» . Note results.
Possible Source(s):
§ Governor valve sticking.
Action(s) to Take:
§ Perform «governor test» . Service as required.
Possible Source(s):
§ Valve body bolts--loose/too tight.
Action(s) to Take:
§ Tighten to 9-11 N-m (80-97 lb-in)
Possible Source(s):
§ Valve body dirty/sticking valves.
Action(s) to Take:
§ Determine source of contamination. Service as required.
Throttle Valve (TV) Linkage; Older AODs used a link rod from the throttle lever down to the trans shift lever area. Later, smaller cars with less room required a cable to get there, so Ford just switched to cables on everything. There's nothing different inside the trans, but the linkage lever will be specific to either a cable end or a rod end
Throttle Valve (TV) Cable Adjustment & Diagrams; Using a 100 psi pressure gauge to the TV port on transmission; "...WARNING: Adjust and check the transmission shift linkage as outlined in the appropriate Workshop Manual. Adjustment must be done in Drive. FAILURE TO FOLLOW THE PROCEDURE WILL VOID THE WARRANTY AND CAN AFFECT THE SERVICE LIFE OF THE TRANSMISSION. For complete TV pressure set procedures, see appropriate Workshop Manual. NOTE: To achieve a correct TV adjustment, it is critical that an accurate pressure gauge (0–60 psi) with hose, Ford Motor Company part number T86L-70002-A or equivalent, be used. Also required is gauge tool D84P-70332-A or T86L-70332-A or equivalent. A. Install the pressure gauge T86L-70002-A or equivalent into the TV Pressure Port located on the right side of the transmission between the Direct and Forward pressure ports (Figure 1). Start engine, with parking brake applied, the transmission in NEUTRAL not Par k, and the fluid at operating temperature, continue with adjustment procedure. B1. For carbureted engines, install gauge tool D84P-70332-A or equivalent as shown, between the carburetor throttle lever and the TV linkage lever (refer to Figure 2). B2. For fuel-injected engines, install gauge tool T86L-70332-A or equivalent between the crimped lug on the end of the TV cable and the plastic fitting on the end of the throttle cable. Make sure the gauge tool is pushed in as far as it will go (refer to Figure 3). C. The pressure gauge must read a TV pressure of 35 PSI (+/- 5 PSI). D. Removing the gauge tool will return the throttle lever and TV linkage lever to the idle position. The transmission remains in NEUTRAL. The TV pressure reading must fall to 5 PSI or less, 0 PSI is preferable. E. If TV pressure of 0 to 5 PSI cannot be obtained, put the transmission in the park position with the engine running and move the TV linkage lever (Figure 2) back and forth 5 to 10 times to eliminate any internal friction within the TV valve assembly. Return the transmission to the neutral position and check TV idle pressure. If the TV pressure is still not in the 0 to 5 PSI range, repeat the process until 0 to 5 PSI is obtained..."
Source: by fordparts.com http://www.fordparts.com/FileUploads/CMSFiles/TransmissionInstructionSheets_AOD_FCS-8393-AD.pdf
Throttle Valve (TV) Cable & Adjustment in an 86 F 150 (same as Bronco);
TV control pressure check and adjustment procedure with engine on. The Throttle Valve (TV) Control Cable System consists of a cable attaching stud on the throttle body throttle lever, the TV Control Cable Assembly, the External TV Control Lever on the transmission, and the Cable Mounting Brackets at the throttle body and transmission. As the throttle body lever is moved from idle to wide open throttle (WOT), the TV control cable pulls the transmission TV control lever from idle to WOT. Return of the cable and transmission lever towards idle is accomplished by the return spring on the transmission end of the cable assembly. This spring and the end of the cable assembly is protected by a flexible rubber boot. The transmission external TV control lever actuates the internal TV control mechanism which regulates the TV control pressure. The travel of this lever is controlled by stops internal to the transmission. The TV control cable is set and locked to its proper length during initial assembly by pushing in the locking tab at the throttle body end of the cable assembly. When the tab is unlocked, the cable is released for adjustment. The take-up spring at this end of the cable automatically tensions the cable when released. With the slack taken up and the locking tab pushed in, the take-up spring plays no part in the operation of the system.
As the guys advided; fluid level is first check in this AOD Trouble Shooting, COMPREHENSIVE; "...from the AOD service manual..."
Source: by duanemyhre at http://www.sccoa.com/forums/showthread.php?t=30511
All Upshifts Harsh or Delayed or No Upshifts
Possible Source(s):
§ Improper fluid level.
Action(s) to Take:
§ Perform «fluid level check» .
Possible Source(s):
§ Throttle linkage--misadjusted (high TV)/ disconnected/sticking/damaged/ return spring disconnected.
Action(s) to Take:
§ Adjust throttle linkage. Service as required,
Possible Source(s):
§ Manual linkage--misadjusted damaged.
Action(s) to Take:
§ Check and adjust or service as required.
Possible Source(s):
§ Governor sticking.
Action(s) to Take:
§ Perform «governor test» . Service as required.
Possible Source(s):
§ Main control pressure too high.
Action(s) to Take:
§ «Control pressure test» . Service as required.
Possible Source(s):
§ Valve body bolts--loose/too tight.
Action(s) to Take:
§ Tighten to 9-11 N-m (80-97 lb-in).
Possible Source(s):
§ Valve body dirty/sticking valves.
Action(s) to Take:
§ Determine source of contamination. Service as required.
o Rough/Harsh/Delayed 1-2 Upshift
Possible Source(s):
§ Improper fluid level.
Action(s) to Take:
§ Perform «fluid level check» .
Possible Source(s):
§ Poor engine performance.
Action(s) to Take:
§ Tune engine.
Possible Source(s):
§ TV linkage--misadjusted (high TV)/damaged. All shifts will be harsh/delayed.
Action(s) to Take:
§ Adjust linkage. Service as required.
Possible Source(s):
§ Main control pressure too high.
Action(s) to Take:
§ «Control pressure test» . Note results.
Possible Source(s):
§ Governor valve sticking.
Action(s) to Take:
§ Perform «governor test» . Service as required.
Possible Source(s):
§ Valve body bolts--loose/too tight.
Action(s) to Take:
§ Tighten to 9-11 N-m (80-97 lb-in)
Possible Source(s):
§ Valve body dirty/sticking valves.
Action(s) to Take:
§ Determine source of contamination. Service as required.
Throttle Valve (TV) Linkage; Older AODs used a link rod from the throttle lever down to the trans shift lever area. Later, smaller cars with less room required a cable to get there, so Ford just switched to cables on everything. There's nothing different inside the trans, but the linkage lever will be specific to either a cable end or a rod end
Throttle Valve (TV) Cable Adjustment & Diagrams; Using a 100 psi pressure gauge to the TV port on transmission; "...WARNING: Adjust and check the transmission shift linkage as outlined in the appropriate Workshop Manual. Adjustment must be done in Drive. FAILURE TO FOLLOW THE PROCEDURE WILL VOID THE WARRANTY AND CAN AFFECT THE SERVICE LIFE OF THE TRANSMISSION. For complete TV pressure set procedures, see appropriate Workshop Manual. NOTE: To achieve a correct TV adjustment, it is critical that an accurate pressure gauge (0–60 psi) with hose, Ford Motor Company part number T86L-70002-A or equivalent, be used. Also required is gauge tool D84P-70332-A or T86L-70332-A or equivalent. A. Install the pressure gauge T86L-70002-A or equivalent into the TV Pressure Port located on the right side of the transmission between the Direct and Forward pressure ports (Figure 1). Start engine, with parking brake applied, the transmission in NEUTRAL not Par k, and the fluid at operating temperature, continue with adjustment procedure. B1. For carbureted engines, install gauge tool D84P-70332-A or equivalent as shown, between the carburetor throttle lever and the TV linkage lever (refer to Figure 2). B2. For fuel-injected engines, install gauge tool T86L-70332-A or equivalent between the crimped lug on the end of the TV cable and the plastic fitting on the end of the throttle cable. Make sure the gauge tool is pushed in as far as it will go (refer to Figure 3). C. The pressure gauge must read a TV pressure of 35 PSI (+/- 5 PSI). D. Removing the gauge tool will return the throttle lever and TV linkage lever to the idle position. The transmission remains in NEUTRAL. The TV pressure reading must fall to 5 PSI or less, 0 PSI is preferable. E. If TV pressure of 0 to 5 PSI cannot be obtained, put the transmission in the park position with the engine running and move the TV linkage lever (Figure 2) back and forth 5 to 10 times to eliminate any internal friction within the TV valve assembly. Return the transmission to the neutral position and check TV idle pressure. If the TV pressure is still not in the 0 to 5 PSI range, repeat the process until 0 to 5 PSI is obtained..."
Source: by fordparts.com http://www.fordparts.com/FileUploads/CMSFiles/TransmissionInstructionSheets_AOD_FCS-8393-AD.pdf
Throttle Valve (TV) Cable & Adjustment in an 86 F 150 (same as Bronco);
TV control pressure check and adjustment procedure with engine on. The Throttle Valve (TV) Control Cable System consists of a cable attaching stud on the throttle body throttle lever, the TV Control Cable Assembly, the External TV Control Lever on the transmission, and the Cable Mounting Brackets at the throttle body and transmission. As the throttle body lever is moved from idle to wide open throttle (WOT), the TV control cable pulls the transmission TV control lever from idle to WOT. Return of the cable and transmission lever towards idle is accomplished by the return spring on the transmission end of the cable assembly. This spring and the end of the cable assembly is protected by a flexible rubber boot. The transmission external TV control lever actuates the internal TV control mechanism which regulates the TV control pressure. The travel of this lever is controlled by stops internal to the transmission. The TV control cable is set and locked to its proper length during initial assembly by pushing in the locking tab at the throttle body end of the cable assembly. When the tab is unlocked, the cable is released for adjustment. The take-up spring at this end of the cable automatically tensions the cable when released. With the slack taken up and the locking tab pushed in, the take-up spring plays no part in the operation of the system.
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