I have an '84 Z28 with the stock T-5 and I have about 150k on it and I want to change the fluid in the tranny. Does anybody know whether you use gear oil or regular tranny fluid? Nobody I ask seems to know, some say gear oil and some say tranny fluid.
Thanks for any help

 

Your non-world class T5 uses gear oil, as do all 83-87 non-world class T5's. The 88-92 world class T5's use automatic transmission fluid.

------------------
West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

ok here is what my gm shop manual says:

all 82-84 5spd`s use sae 80w or 80w/90 gl-5 gear lube

85-86 and 88-92 5spd`s use dexron II auto trans fluid

and 87 5spds use sae 5w-30 manual transaxle oil,

it also says that for 1984 5spds the amount is 3.5 pts.

------------------
87 IROC-z 305 TPI 5spd Borg warner 9-bolt 3.45 posi 4 wheel disc,8.8 Accel wires , bosch platinum +4 plugs,gutted air box,k&n oil filter,synthetic oil 10w30

 

Every T5 that I have ever seen had ATF in it. When you change it just observe the fluid color--if it comes out reddish brown and really thin then put ATF in, if it comes out dark brownish to black then put a light weight motor oil back in. Either way your better off than 150,000 mile old fluid.

 

Ahhhhh... Can't mistake the wonderful smell of gear lube!