5.3 swap tcase low switch - JeepForum.com
 
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post #1 of 5 Old 06-26-2020, 05:05 PM Thread Starter
FergiesJeep
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5.3 swap tcase low switch

so a couple of years age i did a 5.3 swap 4l65E and a NP241C i have a single wire to my ecm that tells it it is in low gear so it can adjust shifting pattern to match low gear it the T case there is a plug that has 3 wires the connector has 3 wires i was wondering if anyone has a the wiring diagram and how the ran this. Would be nice to use low gear...

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post #2 of 5 Old 06-26-2020, 07:46 PM
JeeperDon
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A 3-wire connector on the back of the t-case is the VSS, not the hi/lo switch. The hi/lo switch on a '93 YJ's t-case is vacuum. The only electrical line involved is on the front axle. When the vacuum system activates the axle coupler for 4wd, it also grounds that wire, which goes to the dash 4wd indicator. The indicator gets constant +12v from the ignition system.

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post #3 of 5 Old 06-28-2020, 08:01 AM Thread Starter
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Quote:
Originally Posted by JeeperDon View Post
A 3-wire connector on the back of the t-case is the VSS, not the hi/lo switch. The hi/lo switch on a '93 YJ's t-case is vacuum. The only electrical line involved is on the front axle. When the vacuum system activates the axle coupler for 4wd, it also grounds that wire, which goes to the dash 4wd indicator. The indicator gets constant +12v from the ignition system.
Correct but i dont have the NP231 i have a NP241C out of a 93 chevy that has a 3 wire plug.
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post #4 of 5 Old 07-02-2020, 08:44 AM
NHfireLJ
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Try google...

found this, half way down the page

https://www.gmt400.com/threads/np241...arebody.27105/

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post #5 of 5 Old 07-02-2020, 02:06 PM
jmart2119
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Not sure about the 5.3 computer but in my 5.7 the 4L60E/NP241, one of the pins in the computer just needed a ground when in 4Low. I hooked it up to a toggle switch on my dash and engage the ground when Iím in 4Low.

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