Rivera Primo Gear Set - Manual (Page 2)

12450 Whittier Blvd., Whittier, CA 90602
562-907-2600 Voice 562-907-2606 fax
www.riveraprimoinc.com
4. Verify that the two locating dowels are in place on the right side of the transmission case and place a
new supplied gasket on the dowels. Inserting the mainshaft through the main drive gear, slide the entire
RPI PowerDrive™ gear assembly in until the trap door rests against the case. Tighten the four 5/16 inch
mounting screws to 13-16 ft-Ibs. Tighten the two 1/4 inch screws to 84-108 ln-Ibs.
5. With the spring side facing the transmission case, install the main drive gear seal using Jim’s main drive
gear seal installer part # 2256.
6. Check for sharp edges or burrs and remove if necessary, then install spacer sleeve on the main drive gear
with chamfer facing inboard.
7. Install the transmission sprocket.
8. Install the belt on the sprocket as the sprocket is installed on the main drive gear. Install the sprocket nut
tightening to 60 ft-lbs & then the sprocket nut lock plate. Align the two holes in the lock plate with the
threaded holes in the pulley. Use one drop of red thread locker on each bolt and then torque to 90-110 in.
lbs.
NOTE: The transmission sprocket nut has left handed threads. You must turn the nut counterclockwise to
install on the main drive gear. Do not loosen sprocket nut when attempting to align holes on the lock plate and
pulley.
9. Install the shifter cam and fork assemblies.
10. Install the top cover with vent tube & neutral safety switch using the new gasket supplied.
11. Install the bearing inner race on the transmission main shaft if using a primary chain drive, or omit this
step if using primary belt drive.
12. Install the pushrod end with the throw-out bearing in the right side of the mainshaft.
13. Install the clutch release assembly into the end cover per OE service manual.
14. Install end cover with new gasket supplied.
CASE MODIFICATIONS
It may be necessary on some models to make a minor modification to the stock case prior to final installation of
the PowerDrive™ gear set. Is some case there is a fitment issue in the upper right inside corner that requires
removal of some material. (See photo below). It may also be necessary to enlarge the dowel pin holes on some
OE cases to except the dowel pins in our trap door.