Having problems with your 2004 Chevrolet TrailBlazer ?
Well tanny fluid is dirty and it shifts into low gear and jerks alittle when driving
Service the transmission, replace the transmission fluid and filter, and have them check the transmission fluid line pressure. Base pressure at idle in P,N,OD should be around 70psi and around\015\012140psi in R. Max line pressure should be at least 190psi at WOT in 1st\015\012or 2nd, 225psi is optimum. If base pressure is low, trans or pump is\015\012worn out. If max pressure is low, check EPC solenoid. If reverse is\015\012slow to engage, and line pressure does not come up to at least 130psi\015\012in reverse, replace the boost valve with a Transgo 0.490" or 0.500" boost valve\015\012(easy fix in pan). the boost valve is only an extra $45.00 part and should be replaced every second transmission service. Service is every 60,000 miles. Good luck and this should help address you transmission issues. At worst the EPC valve is sticking due to the dirty fluid and may need to be replaced too which is an easy fix when the transmission is serviced.
Repair Help & Product Troubleshooting for 2004 Chevrolet TrailBlazer
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