primary oil

[HarleyGuy4657]

What type of oil should I use in the primary on ma 76? I have auto trans fluid in it now (type F) I think. The problem that I am having Is when the reves get up in 3rd and 4th gear it starts to slip. I had the same problem back years ago on a 71 but dont remember what I did to fix.

[olpigiron]

I Run  VALVOLINE VR1 sae 50

[hogwilde1]

harley has been making tranny oil for sporty's for years, been using it in my 1980 xls with no problems, 5$ a quart around here

[jmanjeff]

It sounds more like  the fibers plates may be bad   

[pl6344]

before the sporty had there own primary fluid they used to recommend same as used in the engine.never had a problem with it

[Thermos]

There is a Lucas brand of oil that you can use in both the primary and your motor.

[help-u2]

run a heaver engine oil in there.  a.t.f. seems a bit thin for tranny gears.  shear and such..
i run a 40 wt nondetergent cause regular oil eats the belt in my belt drive. 
figgured that out 20 years ago when went through belt every other year.
now belt last 10+ years.  it was the detergent...
while your in there might as well check the plates...a guy can glasss bead or sand glaze off the steel.  mike the fiber ones

[xxxflhrci]

30wt non-detergent motor oil at about a buck a quart has worked for the past 30 years in my '77.  It has 53k miles on it and still has the original clutch plates.

[saltcaveminer]

i really like the redline 75w90 oil (gl-5).very smooth shifting and works well in most temps.Salty