I can tell you for a fact it is not an 4L80E, the "E" stands for electronic and there are no wire connectors on an 1989. Installing a 4L80E in an 1989 would require changing a lot of wiring harnesses and the computer for your truck. Good luck.
No
Check the manifold, just before the headpipe.
If your talking automatic no but if your talking stick shift it will.
700R4 if it's an automatic, NV3500 if it's a manual.
NO it will not.
If it is a 3 speed automatic it is TH125/TH125C/3T40 If it is a Manual it is a Getrag F23
Around 750 rpms on an automatic and 650 on a manual transmission.
Including the torque converter, aprox 10 US qts.
Yes. Look in the yellow pages for aftermarket a/c's
Its an A4LD.
727torqflight
all automatic transmission pans are on the bottom of the transmission