An s-10 transmission with no reverse most likely has an internal problem. The shifter fork or a gear issue can cause no transmission reverse.
That manual transmission doesn't use gear oil. You can use Mercon ATF.
85W140 Gear oil on a manual transmission.
your clutch is probably shot
if 1st 4rd and 5th and reverse do fine, it would have to be in the transmission. clutch problems are noticable in all gears.
for models older then 1996 you use 90 weight gear oil. 1996 and up you use tranny fluid.
The transmission fluid capacity for a 1991 S10 5 speed manual transmission is approximately 3 quarts. This can be purchased at any auto parts store.
ATF will work. (automatic Transmission Fluid)
Dextron 3 Transmission fluid
Neutral Start Switch-can't start in gear Reverse Light Switch- Back-up lighting Speedometer connection Gear sensor?-tells computer what gear tranny is in If auto- electronics controls gear shifting
If I recall the S10 series trucks ran the NV3500 manual transmission. This is the same manual transmission that is installed in the C/K 1500 series trucks. The final answer is yes it will work if it is the NV3500.
If the tranny came off the v6 s10
Mercon works.