Suzuki Sidekick 3L30 TRANSMISSION


Sidekick 3speed, a 70's design

Hydraulic map,, if the blue line is dead, it will never shift to 2nd.

The 3speed is not electronically shifted, no TCM brain.

many kit makers sell full kits for this transmission.

the 3L30 is just and upgraded TH180, used since 1973. and is used on all USPS old JEEP mail waggons. It has NO computers it IS a real Hydramatic transmission. Old school, every inch. but the PCM does activate the TCC lockup. TCC luckup is nothing new, its started here in 1989

kick down is passing gear, causes trans to drop from 3rd to 2nd for passing, also called the TV detent valve. , the modulator does the same on hills .



That right side PRNLD "prindle" switch , sets the reverse lights glowing in reverse. There are 2 cables, one to shift and the kick down cable to the throttle body valve.

the 3speed has no engine to tranny stiffener bars like the 4/5 speed has.

Torque Converter clutch lockup , electrics. via ECU/PCM and the lockup is defeated at heavy throttle or up hills and coasting. the later years the PCM drives the solenoid with no relay, 1997? i think.

If the transmission leaks oil , make sure all top vents are free first. Even the electric connector on the side can leak oil.

this is the Governor, it is a centrifugal device, that measures SPEED of the tail shaft. (RPM) and if it's dead, there will be no up shifts. It too, has a screen that loves to clog when not ATF serviced. See the blue lines , in photo 2 here. The band here is low band.

the color matchs body weight. so the Jeep mail wagon will shift the lightest and the bigger cars will have a more agressive rate. if you use the mail version on your heavy car, the trans will down shift rolling over a dime (hill)

tail shaft gear set.

this is the filter , the pressure switch (bypass it) and the TCC solenoid. There is a TSB telling you to bypass that switch in the center. the 3L30 may be just a screen here, but does in fact pack up.

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