Question about Cars & Trucks
A salvage yard should have the interchange books to tell you for sure. You'll need the model of each one, like 4L80 or 4L60.
Posted on May 06, 2013
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Posted on Jan 02, 2017
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.
Posted on Jun 07, 2009
SOURCE: Transmission swap
I hope you are fine and very well. I have GMC supperban 1993 model 454 TPI Engine 4L80E Transmition. the gear box fail down, i couldn't find smiler one in my place with the same model but i found 4L80E model 1999 454 vortic Engine and i fix it to my car. the proplem i found is the old transmition has 2 speed senser and the new one has one senser. when i do test the car was only revirse and moving forward in one gear one not abule to change to the secound gear.
Note: the harnss in my car and the new transmition has 11 pin and miles metar is waoring.
kindly, im looking forward for you asstance and helpping me to solve this proplem.
have a nice weekend.
Posted on Dec 03, 2011
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