I have a 1997 chevy 1500. The Trans (4l60e) is bad i think
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).
Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. 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).
Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).
No movement in any gear: pump failure, or total loss of fluid. R&R, or refill pan and find the leak. If out of fluid, avoid running the engine until the trans is refilled to avoid pump damage. To check for pump failure, check fluid level with the engine off, then start the engine and recheck fluid level. If level does not go down when engine is running, the pump is broken.
1-2 or 2-3 shift is slow/soft above part throttle: Trans is on its way out. R&R
Good luck and start with checking your transmission fluid level. Thank you for using Fixya
brought car used with 130,000 miles 2 months ago. Had an oil leak which I used a stop leak from NAPA which appeared to solve the problem. Changed radiator 3 days ago. Car drove EXCELLENT for 24 hours. The next day the vehicle was very difficult to accelerate and straining. stop the car and added approximately 4 quarters of motor oil. Power returned immediately! no straining. Today added another quart of oil in the morning. In the afternoon when accelerating starting hearing a sound like a fan propeller when shifting from 2 to 3. ADDED another quart of oil at 3pm today in the afternoon. Car starting giving white smoke at times. at 4 pm power to drive is very low difficult to go above 40 mph without real strain and fan propeller sound from engine. How to approach and solve this problem? MY LIFE DEPENDS ON IT AND NEED LOW COST TO SOLVE. THANK YOU.
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