99' WJ 4.0 242 swap 242HD - JeepForum.com
 
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post #1 of 5 Old 11-17-2019, 01:43 AM Thread Starter
JoMc67
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99' WJ 4.0 242 swap 242HD

Since my TC is leaking on my 99' WJ 4.0 I was thinking of upgrading to the 242HD version from Ebay or similar.


Should this be a straight-forward swap, or is there something else I should know ?..Going to have my Mechanic install this.


Thanks, Joe

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post #2 of 5 Old 11-17-2019, 09:39 AM
LuthWJ77
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Search forum on this topic everything you need to know has been discussed. Cliff's notes version is the HD was meant for V8 so you need to swap input shaft and rear drive shaft may need to be modified. My personal recommendation unless you're wheeling it hard and have large tires there's no real reason to do this to a daily driver or weekend trail rig. Just go find a junkyard replacement to yours that's not leaking or fix yours. 3rd option let it leak gives you an excuse to check levels and add fresh fluid. That's the relationship I personally have with my transmission
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post #3 of 5 Old 11-17-2019, 08:55 PM
SoCal2004wj
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Quote:
Originally Posted by LuthWJ77 View Post
Search forum on this topic everything you need to know has been discussed. Cliff's notes version is the HD was meant for V8 so you need to swap input shaft and rear drive shaft may need to be modified. My personal recommendation unless you're wheeling it hard and have large tires there's no real reason to do this to a daily driver or weekend trail rig. Just go find a junkyard replacement to yours that's not leaking or fix yours. 3rd option let it leak gives you an excuse to check levels and add fresh fluid. That's the relationship I personally have with my transmission
Agree with LuthWJ77. Unless you have a reason to upgrade to the 242HD (or have one laying around), the stock 242 should be fine with the 4.0.
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post #4 of 5 Old 11-18-2019, 05:56 AM
99wjtx
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I believe several forum members run the standard non-HD 242 behind the V8 with no problems because it's considered strong enough with a good torque rating. So if that's the case then surely it's fine with the 4.0. Not only that, but they also have done it because it's easier to find and cheaper.

Rage! Rage against the dying of the Jeep.

99 WJ Limited 4.7/NP242
01 WJ Laredo 4.7/NP242
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post #5 of 5 Old 11-19-2019, 09:45 AM Thread Starter
JoMc67
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Thanks for the information, guys, and will keep the standard 242 and get it fixed or just keep refilling it.
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