I use it on my '08 RKC steed w/6 speed trans and I love it. It shifts much easily and locating neutral is not an issue anymore.

 

Heavy ShockProof®

• Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90
• For heavily-loaded racing differentials and transmissions, problem gearboxes
• Most popular ShockProof product, many racing and specialty applications
• Many performance racing applications like Sprint, Midget, Dirt Late Model and Quick Change Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear ends
• Not recommended for most synchro applications due to the product's extreme slipperiness

 

Little late new boot

 

Spectro and Redline full synthetic. You can't go wrong with either..

 

We have used Red Line Shockproof in all our services, and performance builds since the mid-1990's.
Works well.
Scott

 

I know not if anything has changed in the eight years since the OP asked, but
from
https://www.redlineoil.com/v-twin-tr...ith-shockproof

"V-Twin Transmission Oil with ShockProof® ...
Same fluid as our unique Heavy ShockProof® Gear Oil."

.

 

The best tranny fluid