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  1. X

    hack and tap on older model 231

    Is it possible to use the parts from the rear of a newer model np231 on an older model 231 to be able to do a hack and tap. My friend is doing a hd sye on his 97 wrangler so I will be able to get the mainshaft and rear of the tcase. I was wondering if I could use these parts to be able to do a...
  2. X

    Leaking tcase rear output seal

    I've changed the rear tcase output seal on my 231 in my 88 cherokee twice with a napa seal. I made sure not to damage the seal on installation but it is still leaking quite a bit. Has anyone had this problem with the napa seals? Am I missing something that could cause it to leak? I did not...
  3. X

    failed nox emissions...fuel pump?

    I failed emissions in my jeep the other day. I passed everything except the NOX. My fuel pump has been humming badly for over a year. Would this cause a lean condition causing me to fail nox? Not sure if it is related but if I hold the jeep just above idle for about 30 seconds and then let...
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