Having problems with your 1986 Pontiac Fiero ?

How to change the automatic transmission oil and filter. On 4 cylinder engine

Posted / edited by AnonymousUser on : 22-02-2021

Answers :

Check fluid level every 12 months or 7500 miles, whichever comes first. Transmission fluid and filter should be changed every 100,000 miles. On THM 250C transmissions, intermediate (front) band requires adjustment every 60,000 miles, or as required.\015\012
\015\0121. With vehicle on level surface, apply parking brake and let engine run at curb idle. Move selector lever through all ranges, ending in "PARK".\015\012Remove dipstick and wipe clean, reinstall, then remove again and check fluid level mark on dipstick. Fluid level should check between "ADD 1 PT." and "FULL HOT" marks on dipstick.\015\012
\015\012\015\012RECOMMENDED FLUID\015\012Use only Dexron II or equivalent automatic transmission fluid.\015\012
\015\012CAUTION: If vehicle has been operated for an extended period of time at high speed, or in city traffic in hot weather, or if vehicle has been pulling a trailer, an accurate fluid level cannot be determined until fluid has cooled down (approximately 30 minutes after vehicle has been parked). \015\012
\015\012So let's get started...\015\012\015\0121. With vehicle raised and drain pan placed under transmission, remove front and side transmission oil pan bolts. Loosen rear pan bolts approximately 4 turns each.\015\012
\015\0122. Carefully pry pan loose with screwdriver, allowing fluid to drain. Remove remaining bolts and oil pan with gasket. Remove screen/filter-to-valve body bolts and remove screen/filter with gasket.\015\012
\015\0123. Thoroughly clean pan and screen with solvent and dry with compressed air. Paper type filters should be replaced. Install new gasket or "O" rings, lubricated with clean oil, into screen/filter assembly.\015\012
\015\0124. Install screen/filter assembly to transmission. Use new pan gasket and install pan. Add proper amount of fluid to transmission through filler tube.\015\012
\015\0125. Start engine with shift selector lever in "PARK" position and with parking brake set. Check fluid level and add as required. \015\012\015\012CAUTION: DO NOT overfill.
\015\012
Best of luck :)
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