You can if the 1990 truck is a 4x4.
Yes you can but the 80W will keep it a little cooler.
NO engine management needs input from trans its electric controls . 90 trans is tv cable no feedback could cause trouble plus no where to hook up tv cable
Nope.
6x5.5
I use Castrol GTX.
the modulater on a 90 shevy silverado is located under the dashboard mounted on the steering colum
it will physicly fit but the 99 is a different design and is electronicly shifted and the 90 is not
No, front disc rear drum.
mines a 90 and weights 5380
No , the 2.9 liter V6 engine in a 4X4 , 1990 Ford Bronco II is fuel injected
340,000 miles 90% highway
It does not have one,Its controled by the computer. NEUTZ