88Mustang351W

Okay I got a Borg Warner 5 Speed transmission the only numbers I could find are these
13-52-066-919
the tag is missing from the transmission those are stamped in right under the shifter on the side

I need to know if I used ATF in it or Gear Oil?

GTStang90

I think the book on mine calls for 80W gear oil.

94ford5liter

you always want to use ATF in a t-5. Gear oil will ruin it.

mjr46

not if it's a t-5...dextron III/mercon is what you use

86 5.0L

A NON-WC T5 uses gear oil

a 85+ WC T5 use ATF

http://www.moderndriveline.com/Techn...t5_history.htm

http://www.5speeds.com/t5/

zebo87

the manual says 80w gear oil.

86 5.0L

^ which manual?

SonicBlueFiveSlow

How can you tell the difference between a WC T5 and a Non WC T5? I need to change my tranny fluid and I noticed when I put the motor and tranny back in the car a while back, ]it was filled with gear oil. I don't know if the previous owner put gear oil in it without realizing it needs ATF or if gear oil is right.

GTStang90

The Hayne's manual calls for the following
T50-D Mercon ATF
All others 80W gear oil
I just put a new clutch in my 90 GT and it had Borg Warner on it and I know for a fact it had gear oil in it and I know it was old so apparently it's not a T50-D
Duke

88Mustang351W

Well I know mine says Borg Warner on it but I know it had gear oil in it I don't know if its WC or NWC But since Gear Oil is what was in it then I guess that's what I'm going to put in it