20 Most Recent 1989 Chevrolet C3500 Questions & Answers

To give an accurate weight, need to know tire size and rear axle ratio.

Your ignition barrel has failed. It is just a tube with a lot of switches in it and they fail sometimes.

Hope this

the firewall main harness

The choke light means that the engine choke is defective, have it checked, it is located on the side of the carburetor.

could be bad headlight switch

Before I would start messing with the gear box, I would recommend that you check out the tie rods, ball joints, pitman arm/control arm, to see if that is where the slack is. Most of the time that is the case.

Quite often problems like this one are a result of the wire going through the route of between the door and the dash are broke. This usually happens due to the opening and closing of the door many times over the years and like bending a wire back and forth it eventually will break. A handy volt / ohm meter will identify the problem.

HI. If your speedometer needle doesn't move, or if it flutters, your speedometer cable may be bad.

To determine if it is the cable, disconnect the cable casing from the transmission and from the back of the speedometer on the instrument panel. Draw the cable out from inside of the casing. The cable looks like a twisted piece or wire. If the cable is broken or if it is dry or brittle. It probably needs to be replaced. If the cable is intact and the same length as the cable casing, the problem is likely the speedometer head.

I would also advise to check the speedometer gear as well.

The speedometer gear is located on the output shaft. Inspect it for damage.

This gear rarely suffers damage because the gear from the speedometer that meshes with it is usually made of a softer material. Sometimes, the speedometer gear on the main-shaft is replaceable. A clip can hold it in place or it can be a pressed fit. A special puller is available to pull these gears on the car/truck.

you would need a intake,carb, old hei dist w vac advance and elect fuel pump for carb

check with jeg's high performance parts
you may nead to change your intake

https://en.wikipedia.org/wiki/Chevrolet_Silverado https://www.topspeed.com/cars/chevrolet/2015-chevrolet-silverado-hd-ar160510.html

Hi, I have pasted the procedure below. Your spec is 0 degrees (right at TDC).

CHECKING AND ADJUSTMENT

HEI Systems

1. Start the engine and allow it to reach operating temperature. Stop the engine and connect the timing light to the No. 1 (left front) spark plug wire, at the plug or at the distributor cap. You can also use the No. 6 wire, if it is more convenient. Numbering is illustrated in this section.

Do not pierce the plug wire insulation with HEI; it will cause a miss. The best method is an inductive pickup timing light.

1. Clean off the timing marks and mark the pulley or damper notch and timing scale with white chalk.
2. Disconnect and plug the vacuum line at the distributor on models with a carburetor. This is done to prevent any distributor vacuum advance. On fuel injected models, disengage the timing connector which comes out of the harness conduit next to the distributor, this will put the system in the bypass mode. Check the underhood emission sticker for any other hoses or wires which may need to be disconnected.
3. Start the engine and adjust the idle speed to that specified on the Underhood Emissions label. With automatic transmission, set the specified idle speed in Park. It will be too high, since it is normally (in most cases) adjusted in Drive. You can disconnect the idle solenoid, if any, to get the speed down. Otherwise, adjust the idle speed screw.

The tachometer connects to the TACH terminal on the distributor and to a ground on models with a carburetor. On models with fuel injection, the tachometer connects to the TACH terminal on the ignition coil. Some tachometers must connect to the TACH terminal and to the positive battery terminal. Some tachometers won't work with HEI.


WARNING Never ground the HEI TACH terminal; serious system damage will result.

1. Aim the timing light at the pointer marks. Be careful not to touch the fan, because it may appear to be standing still. If the pulley or damper notch isn't aligned with the proper timing mark (see the Underhood Emissions label), the timing will have to be adjusted.

TDC or Top Dead Center corresponds to 0°B, or BTDC, or Before Top Dead Center may be shown as BEFORE. A, or ATDC, or After Top Dead Center may be shown as AFTER.

1. Loosen the distributor base clamp locknut. You can buy trick wrenches which make this task a lot easier.
2. Turn the distributor slowly to adjust the timing, holding it by the body and not the cap. Turn the distributor in the direction of rotor rotation to ******, and against the direction of rotation to advance.
3. Tighten the locknut. Check the timing again, in case the distributor moved slightly as you tightened it.
4. Reinstall the distributor vacuum line or the timing connector. Correct the idle speed.
5. Stop the engine and disconnect the timing light.

Check the big plug behind the dash - they can come loose