Cherokee '89 4 Litre Auto. 4x4 high in constant use is this OK? - JeepForum.com
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post #1 of 20 Old 05-18-2019, 03:57 PM Thread Starter
Gremmy
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Cherokee '89 4 Litre Auto. 4x4 high in constant use is this OK?

Cherokee '89 4 Litre Auto: Does anyone here use their Jeep XJ in constant 4x4 high everyday all day? 2WD will get you better mileage, but is there any reason why you can' select high 4x4 and go for ever? I don't have a factory user manual to check recommendations so how do you guys use your 4X4? What is the theory?

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post #2 of 20 Old 05-18-2019, 04:12 PM
2oldjeeps
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cant drive on dry pavement. you will trash the t case/diffs. get a book.
only snow grass,mud,back yard...

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
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post #3 of 20 Old 05-18-2019, 05:47 PM Thread Starter
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Originally Posted by 2oldjeeps View Post
cant drive on dry pavement. you will trash the t case/diffs. get a book.
only snow grass,mud,back yard...
On a label, sun visor, says 'Any Surface High'.
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post #4 of 20 Old 05-18-2019, 06:51 PM
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Originally Posted by Gremmy View Post
On a label, sun visor, says 'Any Surface High'.
sorry,my jeeps dont work that way.
if its ok making turns on dry roads,ok. idk 89
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99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #5 of 20 Old 05-19-2019, 05:23 AM Thread Starter
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Originally Posted by 2oldjeeps View Post
sorry,my jeeps dont work that way.
if its ok making turns on dry roads,ok. idk 89
I don't think '4x4 high' goes through the transfer box, so might be ok, just when you engage '4x4 low' do you connect the transfer?
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post #6 of 20 Old 05-19-2019, 07:03 AM
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Quote:
Originally Posted by Gremmy View Post
Cherokee '89 4 Litre Auto:

Which transfer case is installed ?

4x4 Hi or 4x4 Lo means the transfer case is engaged.

The NP242 Selec-Trac was an option available in 1989 and the FullTime 4x4 position can be used on any surface at anytime for as long as you want.

4x4 Hi and 4x4 Lo are Part Time selections that can ONLY be used on slippery surfaces: dirt, gravel, rocks, snow, mud, etc. Do not use Part Time 4x4 for extended periods of time/distance on dry pavement.
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post #7 of 20 Old 05-19-2019, 10:18 AM
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Originally Posted by Gremmy View Post
I don't think '4x4 high' goes through the transfer box, so might be ok, just when you engage '4x4 low' do you connect the transfer?

everything goes thru t case. crawl under and look...!!!

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #8 of 20 Old 05-21-2019, 02:31 PM
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Quote:
Originally Posted by CJ7-Tim View Post
Which transfer case is installed ?

4x4 Hi or 4x4 Lo means the transfer case is engaged.

The NP242 Selec-Trac was an option available in 1989 and the FullTime 4x4 position can be used on any surface at anytime for as long as you want.

4x4 Hi and 4x4 Lo are Part Time selections that can ONLY be used on slippery surfaces: dirt, gravel, rocks, snow, mud, etc. Do not use Part Time 4x4 for extended periods of time/distance on dry pavement.
Shift patter looks like this...

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NP242/skidplates/RC4.5"LA kit/33x12.5mudclaws/15x10rim/sliders&flares/trussed-locked8.8/winchbumper
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post #9 of 20 Old 05-21-2019, 05:00 PM Thread Starter
Gremmy
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Originally Posted by Pinoy59 View Post
Shift patter looks like this...

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That's the one. Does full time 4x4 go through transfer box?
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post #10 of 20 Old 05-21-2019, 05:09 PM
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Originally Posted by Gremmy View Post
That's the one. Does full time 4x4 go through transfer box?
Yes, the difference is it's not locked front to rear like the part time 4x4. Meaning the torque can still go to one wheel.

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post #11 of 20 Old 05-21-2019, 05:28 PM Thread Starter
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Yes, the difference is it's not locked front to rear like the part time 4x4. Meaning the torque can still go to one wheel.

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Thanks, what are the years of Cherokee that have FULL TIME 4 please?
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post #12 of 20 Old 05-21-2019, 05:30 PM Thread Starter
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Originally Posted by CJ7-Tim View Post
Which transfer case is installed ?

4x4 Hi or 4x4 Lo means the transfer case is engaged.

The NP242 Selec-Trac was an option available in 1989 and the FullTime 4x4 position can be used on any surface at anytime for as long as you want.

4x4 Hi and 4x4 Lo are Part Time selections that can ONLY be used on slippery surfaces: dirt, gravel, rocks, snow, mud, etc. Do not use Part Time 4x4 for extended periods of time/distance on dry pavement.

Are there other years of FULL TIME 4X4 or is it just 1989?
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post #13 of 20 Old 05-21-2019, 05:31 PM
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Originally Posted by Gremmy View Post
Are there other years of FULL TIME 4X4 or is it just 1989?


www.jeepforum.com/forum/f11/cherokee-stock-specs-26256/ informs us that NP228/NP229 - "Selec-Trac" - 4Hi (full-time) - N - 4Lo (part-time) - was installed 1984-87.
NP242 - "Selec-Trac" part-time OR full-time - 2.72:1 ratio low range - shift pattern 2wd - 4part-time - 4full-time - N - 4LO - was an option from 1987-2001
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Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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post #14 of 20 Old 05-21-2019, 05:33 PM
Pinoy59
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Originally Posted by Gremmy View Post
Thanks, what are the years of Cherokee that have FULL TIME 4 please?
I think they started around 87 and went through 01. You can Google NP242 to verify that. just looked at it and it is 87.
The pros of having it on the 92 and older XJ is you don't have the cad vacuum disconnect with a one piece axle shaft!

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post #15 of 20 Old 05-21-2019, 05:34 PM
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Originally Posted by Gremmy View Post
Are there other years of FULL TIME 4X4 or is it just 1989?
I have it in my 97.

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