What model transmission is on my 92 4x4 Suburban 5.7 1500. (350)
I just bought a 1992 Chevrolet Suburban. It has a 350 with automatic 4x4 transmission. The transmission will not shift out of 1st gear. I dont know how to search for a trans... Does it have to be a 4x4 or can I purchase a 2 wheel drive, and bolt on my transfer case? Any good pointers will be greatly appreciated. I am not mechanically inclined.
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That should be the L60-4 truck version
Have the sedan version, 93 Caprice.
That was the first year of the new electronic shifting transmission.
Especialy when cold she will shift hard, but it's normal.
But that depends on what you call normal.
I have gotten used to it over the last 17 years.
The shift down linkage on the carburetor below the gas pedal cable might need to be adjusted to increase the hydraulic pressure on the internal clutch plates in the transmission it shows you how to do that in a car manual.
If it has auto 4x4. which will have 4 push buttons on the dash it will take auto trac fluid that you will need to get at your local GM dealer. A regular transfer case will take Automatic transmission fluid.
When the transmission jumps the extra RPM by 200 or 300 RPM. That's your Torque Converter Clutch lock up disengaging or it's slipping.
Pull the transmission dip stick out and check the fluid level and condition of the fluid, look to see that it's not burning. If the fluid is not burning then it's the Torque converter clutch unlocking and the Throttle position Sensor may need to be readjusted, or if the transmission is still running off a TV cable. The TV cable may need to be adjusted and or the transmission filter may be dirty and needs to be changed.
Take it to a transmission shop and explain to them what the transmission is doing. I'm not sure if your transmission is an 4L80 or a 4L80E. If it's the 4L80E the PCM and ECM control the lock up to your converter. If the PCM detects a problem with the transmission, it drops the transmission fluid pressure to the converter clutch. If it's a 4L80, it's controlled by the TV cable and vacuum lines to the transmission modulator. Regardless they can look in to this when they change the transmission fluid and filter.
Recap: Have the Suburban's ECM scanned for any transmission DTC codes. Service the transmission if the fluid is dark in colour and burnt. Adjust any linkage to the transmission that is an issue to it's performance.
Good luck and keep me posted, be glad to help.