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Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet.... Some of these service operations require the use of tools specially designed .... 1-1/2 Ton. 2-3/4 Ton. 3-1 Ton. 4-1/2 Ton (W/HDSusp). Fig. 0A-3-Vehicle Identification Number ... Right Hand Side of Cylinder Block at Rear of Distributor.
Replace the vacuum modulator valve on the transmission . First off I would test it . You would need to buy a hand held vacuum pump ! and find the vacuum hose at the transmission an test for vacuum there . Do you know what a vacuum modulator valve is ? Google 1980 Chevy Caprice transmission vacuum modulator .
The first symptom on your Lemans can be a vacumn leak...check ALL rubber hoses, and the EGR valve hose for cracks, and replace as needed...a vacumn leak or imbalance can also alter the tranny shift points:(... Unfortunately the ticking under the valve cover sounds like a sticky lifter...You can try to lubricate this by changing oil...but use one quart of GM tranny fluid in place of one quart of oil...run motor for ONE day only, and then change oil again with the correct viscosity...10W30 I like Valvoline High Mileage:) Hope these inexpensive fixes work for your classic Lemans!!
YOU CHECK FLOAT LEVEL LOOKING AT THE SIGHT GLASS ON THE RIGHT OF THE CARBURETOR.FUEL LEVEL SHOULD ALIGN WITH THE DOT ON THE SIGHT GLASS.IF THE LEVEL IS ABOVE OR UNDER THE DOT THE CARBURETOR HAS TO BE DISASSEMBLED.TO SET FLOATS REMOVE AND INVERT THE AIR HORN UNTIL THE FLOAT ARM JUST TOUCHES THE NEEDLEVALVE OR THERE IS ABOUT 0.1 mm OR 0.004 INCH CLEARANCE BETWEEN THEM.MEASURE THE DISTANCE BETWEEN THE BOTTOM OF THE AIR HORN GASKET INSTALLED.AND THE CENTER OF THE BOTTOM OF THE FLOAT.THE DISTANCE SHOULD MEASURE 36.4 mm 1.39 - 1.47 INCH. ADJUST BY TURNING THE NEEDLE VALVE SEAT.BE CAREFUL NOT TO ALLOW THE VALVE SEAT TO PROTRUDE FROM THE SEAT ATTACHING BOSS.WHICH WOULD ALLOW THE VALVE TO FALL.IF THIS IS THE CASE BEND THE FLOAT ARM SLIGHTLY UNTIL PROPER CLEARANCE CAN BE OBTAINED.WHEN CARBURETOR IS INSTALLED CHECK FLOAT LEVEL BY LOOKING INTO THE CARBURETOR FLOAT SIGHT GLASS I MENTION IN INFORMATION ABOVE.IF YOU HAVE A 1487cc AND 1600cc CVCC MODELS WITH THE KEIHIN 3 BARREL CARBURETOR.THIS WOULD DEALERSHIP JOB.THIS TYPE IS HARD TO ADJUST.
Did you adjust the shift rods from the shifter to the trans shift arms. Take your shift rods loose and put shifter in neutral, and transmission arms in neutral, then adjust the rods so they slide in. Then your shifter matches your transmission and you should be able to shift just fine.
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