Lock up vs non lockup
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Joined: Nov 2005
Posts: 700
From: Center Point, Texas
Lock Up vs. Non-Lock Up
Newer TH350s use a lock-up torque converter. The advantage of the lock-up is it is more efficient on the highway. When you are in third gear and the RPMs get to a certain level, the distributor triggers the torque converter. This makes the transmission work at a straight 1:1 with no lost power from torque converter slippage. These transmissions are considered to have 3 1/2 gears because of the lock-up.
The down side to the lock-up is the torque converter is not any larger than the non-lock-up version. The clutches take up a lot of space in the converter and so the converter tends to generate more heat. My transmission guy strongly recommended I get a non-lock-up version of the transmission because they last much longer.
The lock up version can be easily identified by the plug it has on the drivers side. It is normally a four prong weather pack plugs, not all the wires are used from what I've seen. The version that does not have a lock up torque converter doesn't have any wires to it at all.
It might be best to use the lock up version of the transmission if your engine originally used a lock up transmission. A different distributor is used with the lock up transmissions and the engine may be tuned for use with the transmission.
THE ABOVE WAS PASTED FROM
http://www.offroaders.com/tech/jeep/...D-gm-th350.htm
Newer TH350s use a lock-up torque converter. The advantage of the lock-up is it is more efficient on the highway. When you are in third gear and the RPMs get to a certain level, the distributor triggers the torque converter. This makes the transmission work at a straight 1:1 with no lost power from torque converter slippage. These transmissions are considered to have 3 1/2 gears because of the lock-up.
The down side to the lock-up is the torque converter is not any larger than the non-lock-up version. The clutches take up a lot of space in the converter and so the converter tends to generate more heat. My transmission guy strongly recommended I get a non-lock-up version of the transmission because they last much longer.
The lock up version can be easily identified by the plug it has on the drivers side. It is normally a four prong weather pack plugs, not all the wires are used from what I've seen. The version that does not have a lock up torque converter doesn't have any wires to it at all.
It might be best to use the lock up version of the transmission if your engine originally used a lock up transmission. A different distributor is used with the lock up transmissions and the engine may be tuned for use with the transmission.
THE ABOVE WAS PASTED FROM
http://www.offroaders.com/tech/jeep/...D-gm-th350.htm
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