Shift Pressures;

When should I set the pressures?

The shift pressure should be checked regularly. The handles should need a slight tug to pull them. If the handles are easily pulled, then the shift pressure is probably too low and the clutch packs inside the transmission will be excessively worn or damaged. For adjusting pressures, remember to make the holes in the floor pan or tin large enough so a socket, (11/2”), can tighten the tower nut.
Read install information for pressure checking procedure.

When should the transmission oil be changed?

Oil cleanliness will determine how long the transmission will last! Period. There is no filtration inside the transmission, so oil should be changed often (often is weekly for the first few weeks). The oil should be changed when the oil is warm, this allows the “trash” in the oil to flow out. If the oil is not warm, the sediments settle on the bottom of the transmission and get stirred up upon the next startup. A filter is recommended, but not necessary.

Oil flows between all the cases. Pulling one drain plug will drain 80-90% of all the oil. Draining from both plugs is recommended. Four speeds require 4-4 ½ quarts. Check install information for type of fluid.

Problem I can’t pull the handle and make the transmission shift.

Solution The ring gear was pushed back while installing the transmission.

1. Lock the front unit before installing and it won’t happen (read installing information).
2. Is there enough input shaft clearance?
3. If this has happened, don’t be upset. You are not the first person, nor the last it will happen to.
4. Call factory about how to fix it.

Problem Car will not move in low gear, but will move If one of the handles is pulled.

Solution Almost always a result of sprag damage. Sprag damage can be prevented though driver education:
1. Don’t burp engine in low gear.
2. Don’t shift high to low under power.
3. Don’t do low gear water burnout’s.
4. While at the starting line, the clutch needs to be loaded, the “drive line” slack being taken up. NOTE: If on a pass; the car or truck gets out of shape and the driver lifts, this unlocks the sprags. The pass should be aborted, if the driver gets back on the throttle sprag damage could easily occur because the engine is getting a run at the sprag. NOTE: Check sprags if a broken rear axle, rear end of driveline problem has occurred.

Noise The transmission is a relatively quiet unit. It does not have the gear drive sound like other units. With mufflers on the cars, more noise can be heard than of cars which are uncapped with open exhaust. Rear end noise happens often, and is transferred up the driveshaft and makes finding or isolating a noise hard.
The two most common noises are:
1. When the handle of a unit is pulled, you can hear a whine noise. a. Can be caused by a pitted front bearing, which can happen because of “trash” in the oil. Front bearings can be replaced easily during transmission service. 2. A more grumble sound is heard after the handle is pulled. a. The inner race of the sprag assembly could be the cause of this noise. It could be indented. This is usually caused by bad driver technique. A four speed has three sprag assemblies in it. Inner races and sprags can be replaced easily during transmission service.

Problem Unit leaks oil between bell housing and transmission case.

Solution:

1. Throw-out bearing collar bolts need sealant because they are exposed to oil (early models). 2. Check front seal. Don’t push the seal all the way in. It will stick out about 0.075 inches, but still clears the collar for proper location on input shaft sealing ring.

Problem:Transmission grinds going into gear.

Solution

1. Lower R.P.M. 2. Start car with transmission in gear.

Question: Is it necessary to carry spare parts?

Answer: It is always possible that a failure could occur due to experimentation or driver error. In any event, it would be wise to carry the following:

1. Clutch Pack: 9 Disc.-11 Steel

1 Sprag

3. Inner Race

4. 4 Quarts Fluid

5. Shim Assortment

6. O-Rings, Assortment

7. Shim Disc .090

8. Pressure Plate Spring

TOOLS: 1. Alignment tool, sprag cover. 2. Pressure checking tube 3. Fish scale 0-50 lb. 4. Allen wrenches This should handle any problem that could be repaired in the field.

Shawn
619.441.7344
JEFFco Performance