With four forward speeds, reverse and neutral and a 3:00 low gear to get things moving, the clutchless designed transmission is truly streetable. Quiet running gear sets deliver superior strength, while also giving some cars as much as 7/10th quicker E.T.’s.

Other User Friendly Features are: Unique shifter with neutral lock out

Will fit in the stock cross members of Chevrolet i.e.: ’67-’81 Cameros, Novas, and others.

Bolts up to a stock Chevrolet Bell Housing or scatter shield

Installation

When installing the transmission to the engine, be sure the front unit is shifted, as to lock the front clutch pack. This keeps the ring gear from being pushed back if the transmission does not slide in easily or mis-measurement occurred.

NOTE: It is very important that you check the input shaft clearance to the pilot bearing in the crankshaft. There should be .060 - .090? Because of different motor plate thickness and scatter shield lengths, you may have to make a spacer for the pilot, or turn the input shaft back a little on a lathe. An O-Ring can be used to take up clearance on the end of the pilot to make clearance to spec.

JEFFco Operating Instructions

The transmission is shipped dry, with no oil. If it is not going into service immediately, put 3 quarts or so in the unit and rotate so rust will not occur in the unit. The capacity is 4 to 4 ½ quarts. I highly recommend motorcycle 2 stroke transmission fluids, such as Torco, Bel Ray Gear Saver, Golden Spectro (75-85 wts). These oils pour like 20-50 Motor Oil. DO NOT SUE SYNTHETICS, they tend to slip the clutches. Oil should be changed weekly on new units, for 2-3 times.

While speaking on oil, it would be recommended that a pump and filter system be used to clean and cool the fluid as to extend the life of the unit. The JEFFco test unit has seen 10,000 miles with no problems. The fluid was changed regularly and the shift pressure kept at correct levels.

The vent line is located on the left side of the transmission, and should have a hose run to an elevated 12 oz. plus catch can, or similar, mounted on the firewall. When the transmission fluid is cold, fluid will run up the line and when warm, decrease.

Transmission Mount: The transmission mount was designed to make installations easier. On some cross members, the transmission mount will need more clearance. Heating the cross member with a rosebud or torch, and then dimpling it with a 1” piece of pipe has been done with good success. This seems to be better than grinding on the cross members.

Adjustment Procedures

Disconnect the Heim Ends and Clevis from the lock over levers; place the checking tube over the locking lever. Put the hook of a Fish Scale (0-50 lbs.) in the tube and pull slowly to shift. Check the highest reading, just before the lever drops into the detent. Do this at operating temperatures, warm if street driven, cooler if drag racing only. 20-28# is a goof for most applications. Repeat this procedure on the 2nd and 3rd cases of the transmission.

If adjustment is needed, loosen the lock nut on the shift tower and turn clockwise to raise the pressure. Half a turn can equal as much as 7-8 lbs. Or as little as 2-3 lbs. One turn can equal as much as 10-15 lbs. or as little as 5-6 lbs., so check them and keep track.

Shift Pressures