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Thank you for your question. You need to bench bleed the clutch master cylinder,
If the truck has a concentric slave cylinder, proceed as follows:1. Operate the clutch pedal at full stroke, 10-20 times.2. Check the fluid level at the change in diameter part of the reservoir. Do not over fill.3. Have an assistant depress the clutch pedal slowly and hold it down.4. Open the slave cylinder bleed screw and watch for escaping air, Figure 13.5. Close the bleed screw and have the assistant release pedal.6. Repeat this cycle several times until there is no sign of air. Be sure to keep the reservoir topped to the correct level.7. Replace the diaphragm and reservoir cover.8. Operate the clutch pedal at full stroke 10-20 times.If this doesn't work. This is the master cyinder procedure.
Using coupling disconnect tool No. T88T-70522-A or equivalent, disconnect hydraulic coupling at transmission by sliding white plastic sleeve toward clutch slave cylinder while tugging on tube. Clean area around clutch master cylinder reservoir cap, then remove cap and fill to step with suitable DOT 3 brake fluid. Using screwdriver or equivalent tool, depress internal mechanism of male coupling to open valve. Then, while holding valve open, depress clutch pedal fully and hold. Remove screwdriver from coupling to close valve, then release clutch pedal. Clutch master cylinder must be kept full at all times to prevent air from entering system. Refill reservoir to step, then operate valve and clutch pedal as described above. Reservoir may again need to be filled. Close reservoir, then reconnect coupling to clutch slave cylinder. When coupling is secured, cycle clutch pedal as quickly as possible through 5 to 10 strokes. Wait 1 to 3 minutes, then repeat clutch pedal cycling 3 more times with 1 to 3 minutes between each set of 5 to 10 strokes. Loosen clutch slave cylinder bleed screw, then depress and hold clutch pedal while torquing bleed screw to 2.2-3.7 ft lbs . Refill reservoir to step, then check clutch operation. If clutch does not release fully, indicating air has remained in system, repeat procedure.