I have a 2000 model chevrolet k2500 old body style,88 thru98 style with 5.7 and auto trans 4l80 truck has 226000, problem sometimes with trans sometimes you start it and take off trans shifts thru 1st thru 3rd like its got a shift kit kinda hard but will not go in fourth, pull truck to side of road turn key off for a minute restart and works fine?

You may be able to ask a Dealer to look at the Vin# ID for the truck to verify. The older 1999 used 3 valves and then the next year or so the engine changed to 4 valves. This was also when the 1999 body style was carried into 2000 for the Heritage Edition. Can not say if the old style body made as a 2000 Heritage had a different engine. The older models did not have "Cam Phasers" which were problematic on the newer generation engines. Sometimes parts stores have access to Vin# requirements in their parts manuals.

4L80E or 4L80? If its not an E there is a cable called a tv cable that may be out of adjustment. That will destroy a trans in a matter of few miles.

I doubt the ECM from a C body would work on your Century. I would probably buy a used computer and prom from a car exactly like yours. The prom is calibrated to the body style, engine, and trans. Each year and model can be different due to emissions standards.

Check TPS sensor[RPM]

IF THAT IS A 4L80 IT DOES NOT HAVE A VACUUM MODULATOR ON THE TRANSMISSION ITS INTERNAL /ELECTRIC

some stamp this on the dipstick for the transmission. without seeing the pan on the transmission its either a 700-r4 4L60 or a 4L80 trans. if you count the number of bolts in the trans it would help

Check out faxonaotuliterature. They have GM service manuals from $79 and they also have GM engine swap manuals for $24.95. I've used them and been extremely satisfied. Hope this helps.

It is a 4L60E , electronic trans. The same trans fits 93 through 99 old body style Tahoe, Suburban, and Pick up's. Good Luck

This is a push and turn style connector. Just push towards the light and turn. You do not have to push extremely hard. Pull out old bulb and replace

they both have a 700r4,check the overall length of trans,they had two trannys 700r4l60e and 700r4l80e.4l60 similar to 350 turbo and 4l80 similar to 400 turbo