Question about Cars & Trucks
Call the shop that did the repair and have them come get the truck and fix it correctly.
Posted on Nov 25, 2013
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Posted on Jan 02, 2017
It is best to flush the fluid this gets the fluid out of the torque converter.This transmission uses special fluid tpye t-Iv gm # 88900925 do not use dexron fluid in this transmission.
Posted on Feb 23, 2010
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
1-2 shift does not happen at WOT or until you let off the gas: Best case: * Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace the TPS. - * Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Doublecheck by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. / *Worst case: poor line pressure rise 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accum housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced. Easy fix in the pan.
Good luck and thank you for using Fixya. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
Posted on Mar 17, 2010
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