yo D,
AS Seabronc advised, I'' also go with the first 2 on this list for Erratic Shifting;
• Shifter Misadjusted
• Kickdown Rod Misadjusted
• Low Fluid Level
• High Fluid Level
• Vacuum Line Cracked or Leaking
• Valve Body Bolts Loose
• End Plate Bolts Loose
This is by Chilton
Apply a small amount of clean engine oil to the kickdown and shift linkage points at 7,500 mile intervals.
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Cable type shift linkage
http://content.chiltonsonline.com/content/images/8828/images/88287g09.pdf
1.Disconnect the negative battery cable.
2.Remove the plastic cable terminal from the shift control lever pivot ball by prying with a flat-bladed tool between the cable plastic terminal and the shift control selector lever and housing.
3.Remove the transmission shift cable from the transmission shift cable bracket by carefully lifting on the locking tab while pulling up on the fitting.
4.From the engine compartment, remove the cable and grommet from the bulkhead.
5.Remove the plastic slide adjuster from the manual lever pivot ball spring with a flat-bladed tool between the side adjuster and manual control lever.
6.Remove the transmission shift cable from the transmission shift cable bracket by carefully lifting on the locking tab while pulling up on the fitting.
To install:
7.From the instrument panel, feed the plastic terminal through the opening in the dash panel to the engine compartment.
8.Press the rubber boot on the transmission shift cable into the dash panel.
9.From the engine compartment, install the transmission shift cable into the transmission shift cable bracket and make sure the locking ears are properly located and seated into the bracket.
10.Place the transmission shift cable on the manual lever pivot ball and press into place.
11.From the passenger compartment, install the cable-to-steering column transmission shift cable bracket onto the transmission shift cable and make sure the locking tab is fully seated and locked into place.
12.Snap the cable plastic terminal to the shift control selector lever pivot ball on the steering column.
13.Properly adjust the cable as necessary. Refer to adjustment procedure in this section.
14.Remove the cable lock tab and replace the with a new lock tab.
15.Road test the vehicle and check for proper transmission operation.
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Rod Type Linkage
Separating the shift rod and grommet
http://content.chiltonsonline.com/content/images/8828/images/88287g10.pdf
Separating the shift rod and grommet working in a tight area
http://content.chiltonsonline.com/content/images/8828/images/88287g11.pdf
Polyurethane plastic grommets are use to connect the various rods, lever and adjusting stud. Whenever a rod is disconnected from a grommet type connector, the old grommet must be remove and a new one installed. A special tool T67P-7341-A or equivalent is required to install the grommet in the shaft lever and to install the shaft linkage rod into the grommet.
1.To remove the rod end connected to the shift column, place the lower jaw of the tool between the shift lever and the shift rod. If working in limited space use tool T84P-341-A or equivalent.
2.Position the stop pin against the end of the shift rod and force the rod out of the grommet.
3.The grommet is removed from the lever by cutting off the large shoulder of the grommet.
4.Remove the grommet from the lever by pushing it out of the lever.
5.Disconnect the rod at the transmission manual shift lever by removing the attaching nut and remove the linkage.
6.Prior to installing a new grommet, adjust the stop pin if necessary to properly install the grommet. Coat the outside of the grommet with a Multipurpose Long Life lubricant. Then place the grommet on the stop pin and force it into the shift lever hole. Turn the grommet several times to be sure it is properly seated.
7.Re-adjust the stop pin to a length which is sufficient to install the shift rod into the grommet. If the pin height is not adjusted, the shaft rod may be pushed too far through the grommet, causing damage to the grommet retaining lip.
8.With the pin height properly adjusted, position the shift rod on the tool and force the rod into the grommet until the groove in the rod seats on the inner retaining lip of the grommet.
9.Install the shift linkage to the manual shift lever and install the retaining nut. Do not tighten.
10.Adjust the shift linkage as described in this section.
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C6 shift linkage adjustment points
http://content.chiltonsonline.com/content/images/8492/images/84927117.pdf
1.With the engine stopped, place the transmission selector lever at the steering column in the D position for the C6 or the D overdrive position for the AOD and E4OD, and hold the lever against the stop by hanging an 8 lb. weight from the lever handle.
2.Loosen the shift rod adjusting nut at the transmission lever.
3.Shift the manual lever at the transmission to the D position, two detents from the rear. On the F-150 with 4WD and Bronco, move the bell crank lever.
4.With the selector lever and transmission manual lever in the D or D overdrive position, tighten the adjusting nut to 12-18 ft. lbs. (16-24 Nm). Do not allow the rod or shift lever to move while tightening the nut. Remove the weight.
5.Check the operation of the shift linkage
1.With the engine stopped, place the transmission selector lever at the steering column in the D position for the C6 or the D overdrive position for the AODE-W, 4R70W and E4OD.
2.Hang a 3 lb. (1.4 kg) weight on the end of the shift lever.
3.Pry the end of the shift cable from the transmission control lever ball stud.
4.Unlock the adjuster body, release the lock tab on the top side of the cable by pushing down on the 2 tangs.
5.Check to be sure the cable moves freely without binding.
6.Move the lever on the transmission all the way rearward and then 3 detent positions forward.
7.Holding the cable end fitting, push the cable rearward until the end fitting lines up with the manual control lever ball stud.
8.Push up on the lock tab to lock the adjuster body in the correctly adjusted position. Be sure the locator tab is properly seated in the bracket.
9.Make certain the shift cable is clipped to the floor pan at the white cable mark and the cable is routed into the tunnel.
10.Adjust the shift indicator pointer while the transmission is still in the overdrive position.
11.Remove the weight and check the control lever in all shift positions.
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Detent (Downshift) Linkage for CARBED ENGINES (leaving this for posterity)
1.Move the carburetor throttle linkage to the wide open position.
2.Insert a 0.060 in. thick spacer between the throttle lever and the kickdown adjusting *****.
3.Rotate the transmission kickdown lever until the lever engages the transmission internal stop. Do not use the kickdown rod to turn the transmission lever.
4.Turn the adjusting ***** until it contacts the 0.060 in. spacer.
5.Remove the spacer.
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Throttle valve lever retention spring on the 4.9L and 5.0L engines
http://content.chiltonsonline.com/content/images/8492/images/84927121.pdf
Unlocking the tab at the throttle body on the 5.0L engine
http://content.chiltonsonline.com/content/images/8492/images/84927124.pdf
Throttle valve control cable adjustment-MFI and SFI engines
http://content.chiltonsonline.com/content/images/8492/images/84927125.pdf
Neutral Safety/Back-Up Light Switch
1.Hold the steering column transmission selector lever against the Neutral stop.
2.Move the sliding block assembly on the neutral switch to the Neutral position and insert a 0.091 in. (2.3mm) gauge pin in the alignment hole on the terminal side of the switch.
3.Move the switch assembly housing so that the sliding block contacts the actuating pin lever. Secure the switch to the outer tube of the steering column and remove the gauge pin.
4.Check the operation of the switch. The engine should only start in Neutral and Park.
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Shift Linkage Adjustment & Removal & Installation in an 80 Bronco, F & E Series; part of column R&R 11.2 MB pdf file
Source: by broncohq.com
http://broncohq.com/pdf/80-96/body/80columrebuild.pdf
In this doc, Internal Downshift & Manual Linkage is described on page 17-10-17; I have shown this to others here and elsewhere for the LINKAGE adjustment, but never rec. feedback on its application to Broncos.
C6 Description & Operation, Adjustments, Diagnosis & Testing (partial), Disassembly & Assembly, Removal & Installation (includes Governor) & Specifications by thedieselfiles.com
http://www.thedieselfiles.com/Ford/C6%20Automatic%20tranny.pdf
