Assuming you have a automatic transmission the dipstick should be located under the hood, behind the engine, on the passenger side.
It is made on to the clutch slave cylinder that mounts on the side of the transmission.
There is no dipstick on the standard transmission , the fluid level is checked at the fill plug on the transmission
Well, your 1990 Chevy Cheyenne came OE with P225/75R15 however, in this case you can use P235/75R15 it is more common and cost less. COO of TireTyre.com
most 88-98 Chevy pickups are basically the same. the only difference between yhe cheyenne and silverado is the trim.
I it is a manual transmission it has no dipstick. If it is A/T it is located on the front of the transmission near the engine block. It is very small and has no tube. Look carefully.
700 R4 transmission.
The transmission dipstick is located on the passenger side of the engine compartment, adjacent to the evaporator case.
You can find a stereo wiring diagram for your 1990 Chevy Cheyenne 2500 at most Chevrolet dealerships. The stereo wiring diagram will be in Chevrolet service manuals at your local library.
In between the air filter and the raditior
You are going to need a long funnel as it goes into where you pull the dipstick for the transmission fluid out
That would be the 700R4
rear passenger side of engine