Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Automatic Transmission

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FLUID LEVEL CHECK





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Fig. Fig. 1 Remove the automatic transmission dipstick and check the fluid level

The fluid level should be checked with the engine at normal operating temperature and running. If the vehicle has been running at high speed for a long period, in city traffic on a hot day, or pulling a trailer, let it cool down for about thirty minutes before checking the level.

  1. Park on the level with the engine idling and the shift lever in Park.
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  3. Remove the dipstick at the rear of the engine compartment. Cautiously feel the end of the dipstick with your fingers. Wipe it off and replace it.
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  5. If the fluid felt cool, the level should be between the two dimples below ADD. If it felt warm, the level should be at or near (above or below) ADD. If it was too hot to hold, the level should be between ADD and FULL. Check the level on the dipstick.
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  7. The correct fluid is DEXRON® II. Be careful not to overfill; this will cause foaming, fluid loss, and slippage. Add fluid through the dipstick tube.
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The distance from ADD to FULL is one pint.

The fluid should be drained with the transmission warm.

  1. Prepare a pan to catch the transmission fluid (about 5 pts).
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  3. Loosen all the pan bolts, then pull one-corner down to drain most of the fluid. You can buy aftermarket drain plug kits that make this operation a bit less messy, once installed. Some early models already have a plug.
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If the fluid removed smells burnt, serious transmission troubles, probably due to overheating, should be suspected.

  1. Remove the pan screws and empty out the pan. On some models there isn't much room to get at the screws at the front of the pan. The pan can be cleaned out with solvent but it must be dried thoroughly before replacement. Be very careful not to leave any lint or threads from rags in the pan.
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  3. Remove the filter or strainer retaining bolts. A reusable strainer may be found on some models. The strainer may be cleaned in solvent and air dried thoroughly or replaced. The filter and gasket are to be replaced.
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To install:

  1. Install the new gasket and filter.
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  3. Install the pan with a new gasket. Tighten the bolts evenly to 12 ft. lbs. in a crisscross pattern.
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  5. Add DEXRON® or DEXRON II® transmission fluid through the dipstick tube. The correct amount is in the Capacities Chart.
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  7. Start the engine and let it idle. Do not race it. Shift through all the indicator positions, holding the brakes. Check the fluid level with the engine idling, in Park. The level should be between the two dimples on the dipstick, about 1 / 4 in. above the ADD mark. Add fluid as necessary.
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  9. Check the fluid level after the truck has been driven enough to thoroughly warm up the transmission. Details are given under Fluid Level Checks earlier in this information. If the Transmission is overfilled, the excess must be drained off. Overfilling causes aerated fluid, resulting in transmission slippage and probable damage.
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