Transmission

doc623 · #1 07/12/05, 08:05 AM

93 chev suburban transmission problem?
Replaced the original transmission about 15-18k miles ago.
Last week suburban started not down shifting when stopping at light and seems to want to start out in 2nd gear; also not wanting to shift up into
overdrive.
Can manually shift via level into 1st gear, get started and manually shift into 2nd or Drive. Reverse is fine.
Since I can shift manually am thinking is possibly a sensor problem rather than the transmission itself.
Am I right or wrong ?
Any thoughts?
Any help would be appreciated.
Thanks in advance.

mightybooboo · #2 07/12/05, 11:30 AM

A friend had a ford not go into first,but could manually shift into first.It was just what you think,a sensor.Thats all I know about it though.

BooBoo

DrippingSprings · #3 07/12/05, 12:54 PM

had same problem on a 700 overdrive in a chevy. bad sensor

kmaproperties · #4 07/12/05, 04:37 PM

could also be the vacuum modulator. it's on outside of tranny with vacuum line to it costs about 30.00, you can get different shift ranges.

james dilley · #5 07/12/05, 10:24 PM

You might need to check the strainer and hope theres not mud in the bottom of the pan, you might want to put a maginet in the pan to keep the strainer clean, as the stainer is to be replaced at12-15000 miles to keep the unit working right.