Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1991SEVILLE V8-300 4.9LREPAIR AND DIAGNOSISDIAGRAMSFLUID DIAGRAMSAUTOMATIC TRANSMISSION/TRANSAXLE4T60 AUTOMATIC TRANSAXLEMANUAL THIRD
1991 Cadillac Seville V8-300 4.9L
Manual Third
1991 Cadillac Seville V8-300 4.9LSECTION Manual Third
Manual Third:
MANUAL THIRD
CONVERTER CLUTCH - RELEASED*
SECOND CLUTCH - APPLIED
THIRD CLUTCH - APPLIED
THIRD ROLLER CLUTCH - HOLDING
INPUT CLUTCH - APPLIED
INPUT SPRAG - HOLDING
When the selector lever is moved to the Manual Third (3) position, the manual valve directs line pressure into the Drive 3 (D3) passage. Drive 3 oil flows to the following valves:
3-4 Shift Valve: Drive 3 oil pressure pushes the 3-4 shift valve closed allowing fourth clutch oil to exhaust and release the fourth clutch.
2-3 Shift Valve: Drive 3 oil feeds through the 2-3 shift valve into the input clutch passage and applies the input clutch.
SUMMARY
The transaxle can shift between First, Second, and Third Gears as in Drive Range, but is prevented from shifting to Fourth Gear. The input clutch is applied to give engine braking. Line pressure is the same as in Drive Range.
*In Manual Third," the converter clutch is shown released, but if the throttle is opened enough, the converter clutch could engage.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.