No the c6 is a 3speed automatic transmission that was used on earlier fords.
i think it was a 3speed and optional 4speed
if its overdrive its a 700r4 if 3speed it should be a turbo 400 It came factory with a 4L80E Transmission
Check of change fluid and filter--if this doesn't help it may be time for a rebuild
one of three. c6 3speed auto. aod 4speed with overdrive. or a 5 speed manual
Possibly a Clogged transmission filter. Change the fluid and filter.
28-30mpg depending on your driving traffic, your type of trany(3speed, 4speed or 5speed) and hilly terain makes this go down !
Three speed automatic doesnt take gear oil. It takes dexron type 2 automatic fluid.
'87 2.8 V6 5spd averages about 25 MPG. 85 2.8 v6 se auto 3speed gets 18 city 26ish hwy
Speed = Distance/TimeSpeed = 26.2/180180 minutes = 3 hoursSpeed = 26.2/3Speed = 8.7333 recurring mph
look at the decal on the inside of your trunk lid. It has a lot of numbers called RPO codes. If you see MB3 it is a 3speed if you see MS7 then it is a 4speed.
The easiest way is to drop the car off at a local transmission shop, give them eight hundred dollars and your phone number. If you really need to ask this question the job is over your head.