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gn87turbo

Member
Joined
Aug 8, 2007
Messages
167
I noticed the other day that my car isnt shifting into overdrive. 2004r tranny shifts fine with no problems, just no overdrive. What could be the problem? Thanks.
Patrick
 
I noticed the other day that my car isnt shifting into overdrive. 2004r tranny shifts fine with no problems, just no overdrive. What could be the problem? Thanks.
Patrick

A few things from ATSG manual.

(Valvebody & Spacer Plate)
3-4 Shift Valve or 3-4 Throttle Valve stuck.
Orifice in Spacer Plate plugged.

(Center Support)
Passages plugged.
Attaching Bolts loose/missing.
4th Clutch Piston- Cracked, Seals damaged.

(Case)
Leak between 3-4 Accumulator Piston & Pin.
3-4 Accumulator bore damage.

A Pressure gauge will help diagnose the problem.
 
just stating what my trans guy said, im not a trans person or my 4th gear would work lol
 
That would only prevent lockup. 4th is a valve that is controlled by governor pressure against TV pressure. Nothing electronic involved. Check what SSedan suggested. If there is a lot of debris in the pan, 4th clutches are gone. Could be a lip seal torn/cut/hard and not applying pressure to piston and is an internal leak. Pressure check needed.

Check the switch which is attached to the brake pedal.
 
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