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  Topic Review (Newest First)
02-07-2017 05:45 AM
jeepjeepster
Quote:
Originally Posted by Timo_90xj View Post

On the other hand, '98s never came with an aux. cooler out of the factory line.
That, my friend, is a valid statement.









Check valve I took out



Its sortve wild that the little cooler lines are able to move enough fluid to keep the transmission cool. I suppose in extreme situations they wouldnt be able to keep the transmission cool.

Has anyone seen the tube like fin coolers that people use as transmission coolers? Ive seen them on grand wagoneers. People mount them up under the rocker panels and call it good. They say they work great but I cant see how.
02-06-2017 04:01 PM
Timo_90xj Aamhhh yeah, tow package/ tow. prep. package and some other option packages include the aux. cooler on the '93-'97. Not all of them has one. My mistake.

On the other hand, '98s never came with an aux. cooler out of the factory line.
02-06-2017 01:49 PM
jeepjeepster ^ I did also but Ive been wrong once....

Ive done did added one of the biggest coolers I could fit on my 5.9. The only fitting I bought was a barbed fitting so I could afix a hose to the hard line. I believe it would be an easy swap but I wanted to remove the check valve, which is also the barbed fitting.

Photos are on photo bucket but it currently says no.
02-06-2017 10:40 AM
xteban
Quote:
Originally Posted by Timo_90xj View Post
You have a '97, not a '98. '98 is the only model year when ZJs were not equipped with an aux. tranny cooler.
All 93-97 have a tranny cooler? I thought that was part of the optional tow prep package only.
02-06-2017 10:07 AM
StPaul59
Quote:
Originally Posted by Sandy97ZJ View Post
I haven't taken formal ownership of the vehicle yet so I can't help you out yet... I'll send you some pictures when I do, but I imagine the process is identical to when I did my 97 4.0

Thank you to everyone else for responding to this thread.
Ive heard the fittings are different between the 98 and 97s.
02-06-2017 09:47 AM
Sandy97ZJ
Quote:
Originally Posted by Ace14 View Post
Got ya. Are there any write ups or anything showing what fittings and stuff are needed to do to a 5.9?
I haven't taken formal ownership of the vehicle yet so I can't help you out yet... I'll send you some pictures when I do, but I imagine the process is identical to when I did my 97 4.0

Thank you to everyone else for responding to this thread.
02-05-2017 03:56 PM
Ace14
Quote:
Originally Posted by Timo_90xj View Post
All '98s lack the external cooler like I wrote - they only have the radiator loop.
All '93-'97s have the radiator cooler loop + aux. cooler.

Some sources say the '98 ZJs got a slightly better cooling loop in the radiators which is why Jeep dropped the external aux. cooler. In reality, the raditor loop is not effective enough even in cooler climates, let alone in warm/ hot climate. If you own a 1998, an aux. cooler should be included in the tranny cooling circuit.

Got ya. Are there any write ups or anything showing what fittings and stuff are needed to do to a 5.9?
02-05-2017 03:52 PM
Timo_90xj
Quote:
Originally Posted by Ace14 View Post
I thought all 5.9s had the tranny cooler built into the radiator? I am doing a new rad soon and opting for a separate trans cooler.....
All '98s lack the external cooler like I wrote - they only have the radiator loop.
All '93-'97s have the radiator cooler loop + aux. cooler.

Some sources say the '98 ZJs got a slightly better cooling loop in the radiators which is why Jeep dropped the external aux. cooler. In reality, the raditor loop is not effective enough even in cooler climates, let alone in warm/ hot climate. If you own a 1998, an aux. cooler should be included in the tranny cooling circuit.
02-05-2017 03:25 PM
Ace14
Quote:
Originally Posted by Timo_90xj View Post
You have a '97, not a '98. '98 is the only model year when ZJs were not equipped with an aux. tranny cooler.
I thought all 5.9s had the tranny cooler built into the radiator? I am doing a new rad soon and opting for a separate trans cooler.....
02-05-2017 02:49 PM
StPaul59
Quote:
Originally Posted by Eugnton View Post
Do y'all have a recommendation on the tranny cooler? Brand or style? My fluids look good, nice and purple, but I now have concerns after reading this thread.
I put a cooler on mine at 152k and it shifted fine then. 4 years later all is well. Even found a chunk of snap ring in the pan, still shifts great. Wife overheated the motor till the bottom hose blew off, still runs great
02-05-2017 01:43 PM
Timo_90xj You have a '97, not a '98. '98 is the only model year when ZJs were not equipped with an aux. tranny cooler.
02-05-2017 10:44 AM
Eugnton Do y'all have a recommendation on the tranny cooler? Brand or style? My fluids look good, nice and purple, but I now have concerns after reading this thread.
02-04-2017 02:22 PM
ZJay1998 Both of my ZJ's had coolers not sure if they were installed before or after. I would pay for one that much. I spent 2K on my first ZJ it had 220K miles no front driveshaft needed new transfer case. No heat A/C needed to be recharged and needed new tires right away.

My second one I paid $1300 for it had 205K miles 4" lift with Bilstien Shocks New headers and exhaust heat and ac worked. After market stereo and kicker audio all the way around along with 2 12" subs. The second one I bought was the better deal for sure.
02-04-2017 02:11 PM
Sandy97ZJ
Quote:
Originally Posted by Timo_90xj View Post
I live in Finland, and the tranny would warm up to and over 250F in summer stop-and-go traffic with only about 65-70F outside temp. Even worse if it happened to be hotter, or when wheeling.
Before I installed the aux. cooler, I had the tranny hit ~260F when wheeling in deep snow in winter... that was pretty much WOT action all day, but anyways.. it was in below-freezing temps. With the aux. cooler, I've never seen it exceed 185F.


Damn sure you will be installing an auxiliary tranny cooler!
Yep I put coolers on all of my vehicles now
02-04-2017 01:58 PM
Timo_90xj I live in Finland, and the tranny would warm up to and over 250F in summer stop-and-go traffic with only about 65-70F outside temp. Even worse if it happened to be hotter, or when wheeling.
Before I installed the aux. cooler, I had the tranny hit ~260F when wheeling in deep snow in winter... that was pretty much WOT action all day, but anyways.. it was in below-freezing temps. With the aux. cooler, I've never seen it exceed 185F.


Damn sure you will be installing an auxiliary tranny cooler!
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