Gear Box Clunking what oil

[eagle56]

ATF in my prim (good Move no more first start crunch)
the prim chain is self adjusting 08 model.
I have put mobil 1 in the box 75/90 and i get the clonk when changing on the run (6speed) is this an oil issue should i go thicker??????

[Faast Ed]

You will always get some clunking because the new style auto adjusters are not as accurate as the old style where you adjusted it yourself.

I like Redline Shockproof Heavy in the trans. Clunking is minimal, but I still get some.

[Gary7]

Originally Posted by eagle56

ATF in my prim (good Move no more firt start crunch)
the prim chain is self adjusting 08 model.
I have put mobil 1 in the box 75/90 and i get the clonk when changing on the run (6speed) is this an oil issue should i go thicker??????

I personally think 75w90 is a little too thin for a Harley transmission. 75w90 gear oil is roughly the same viscosity as 15w40 motor oil. The transmission really needs a 20w50 (75w110) or 20w60 (75w140).

[btsom]

My transmission (2008 RK) has clunked with HD syn, Amsoil 75-150 and with Royal Purple 75-150 syn. Seems to be the nature of the beast. Consistently being able to select neutral seems best with the Royal Purple. Just one man's/bike's experience.

[eagle56]

Redline is that 70/140 I hear its like glue???????????
Lucas also do a syn 70/140.
may be I should change to the thicker grade

[fatty239]

I agreeeeeeee!