If it's a 1/2 ton then it is a 4L60E / 4L65E
If it's a 3/4 ton then it is a 4L80E / 4L85E
That would be the 4L80E transmission.
The 2004 Chevrolet Silverado-1500 has a 5-speed manual.
The 2004 Chevrolet Silverado-2500HD has a 5-speed manual.
That would be a 4L60E transmission.
dextron 3
type of fluid for 5 speed manual transmission
Dexron. Automatic Transmission fluid
Dextron IIIDextron III
Dexron iii
Should be a 700R4 Trans.
If it's a 1/2 ton it should have the 4L60E transmission in it. 3/4 tons have the 4L80E in them.
1/2 tons used the 4L60E. The 3/4 tons used the 4L80E in them.