How to Fix Transmission Problems
Learn how to fix transmission problems with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Diagnose Transmission Issue
Step 1: Diagnose Transmission Issue
Identify symptoms: slipping gears, delayed shifting, fluid leaks, grinding noises, or warning lights.
OBD2 Scanner
Code reader for checking transmission fault codes
Transmission Repair Manual
Guide to diagnosing and fixing transmission issues
2 Step 2: Check Transmission Fluid Level and Condition
Step 2: Check Transmission Fluid Level and Condition
Check fluid when engine is warm - should be pink/red, not dark or burnt smelling.
Transmission Fluid
ATF specific to your vehicle transmission type
3 Step 3: Replace Transmission Filter and Fluid
Step 3: Replace Transmission Filter and Fluid
Drop transmission pan, replace filter, refill with correct fluid type and amount.
Transmission Filter Kit
Filter with pan gasket for fluid service
Transmission Fluid Pump
Hand pump for filling transmission
4 Step 4: Inspect for External Leaks
Step 4: Inspect for External Leaks
Check pan gasket, output shaft seals, cooler lines, and torque converter for leaks.
Transmission Pan Gasket
Replacement gasket for stopping pan leaks
Output Shaft Seal
Seal for transmission output shaft
5 Step 5: Test Solenoids and Sensors
Step 5: Test Solenoids and Sensors
Use scanner to check shift solenoid operation and speed sensor readings.
Transmission Solenoid Kit
Replacement solenoids for shift control
6 Step 6: Consider Professional Rebuild if Needed
Step 6: Consider Professional Rebuild if Needed
If internal damage (slipping, hard shifts persist), transmission may need professional rebuild or replacement.
Transmission Rebuild Guide
Book on rebuilding automatic transmissions