NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #31  
Old July 27th, 2018, 13:57
XJEEPER's Avatar
XJEEPER XJEEPER is offline
NAXJA Member # 13
 
Join Date: Aug 2002
Location: Wasatch Range
Posts: 8,965
Re: Switching to AN fitting for auto trans



I'm installing a B&M 70273 trans cooler and discovered that the factory transmission hose routing on my XJ conflicts with diagram from the FSM.

On my rig, the Outlet line routes from the front port of the trans into the bottom of the radiator heat exchanger, then out the top of the radiator and into the external factory cooler, then back to the transmission rear Inlet port.

The hose connections types don't allow for the routing to be reversed and I'm not sure how the cooling effectiveness differs with the fluid flowing top to bottom VS bottom to top.

I'll be bypassing the heat exchanger in the radiator anyway, so this info will become irrelevant after tomorrow.
__________________
Speak the Truth-Question with Boldness-Speak without fear.
Reply With Quote
  #32  
Old July 27th, 2018, 22:08
Heavyopp Heavyopp is offline
NAXJA Member
 
Join Date: Jan 2017
Location: Middlesex, NJ
Posts: 583
Re: Switching to AN fitting for auto trans

Don't you think you would get better flow flowing from bottom to top

No air pockets, gravity not pulling fluid in one direction, full fill and use of the cooler
Reply With Quote
  #33  
Old July 27th, 2018, 23:00
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 11,856
Re: Switching to AN fitting for auto trans

I kept the radiator cooler because I do a lot of wheeling in Colorado. For 15yrs it was plumbed from the rad to the Hayden cooler. When I built my stroker I wanted to change that. The new set-up is output from trans to bottom of Hayden, top of Hayden to bottom of rad, top of rad to return. It now runs at straight regardless of load/time/conditions.
Reply With Quote
  #34  
Old October 7th, 2018, 23:35
98xjaz 98xjaz is offline
NAXJA Forum User
 
Join Date: Nov 2014
Location: AZ
Posts: 5
Re: Switching to AN fitting for auto trans

Thanks for posting this link in the other radiator thread. I just did this this to mine and I have a few questions for you about temps if you would like to answer since our set ups and location seem to be so similar.


I went with the AN 6 adapter from Summit out of the trans and added a sending unit right there. I ordered new solid lines from amazon and modified them a little. I also picked up the Ridgid 37 degree flare tool to go from the stock solid lines to AN 6 with the nuts and bushings from Summit. Mine runs out of the trans to a spin on filter adapter I mounted to the cross member up front under the radiator that holds a filter the same as the engine oil filter. From there, I used aluminum hard line again from Summit to go to the bottom of the same Hayden cooler you have. Out the top with the aluminum hard line to the bottom of the factory trans cooler in the radiator (with a short hose between the two). I used the stock outlet line from the top of the radiator cooler and had it and the inlet modified by my favorite local hose shop. They brazed or soldered AN 6 adapters where I wanted them and then made all of the soft hoses with hydraulic type fittings to tie it all together.


At the time I did this, I replaced the radiator with a new stock style, water pump(gates), cap, thermostat and all the coolant hoses. I was able to flush the block with a steam cleaner and flushed the heater core as well. I also replaced the fan clutch with the ZJ one from Napa.


All of that out of the way, it seems to run hot in town. Stop and go when its 100 or better outside keeps both temps around 220 or better. I haven't wheeled it yet but I imagine the condition will be worse when crawling along. It will also overheat when idling for extended periods in gear or not. When it is warm, the engine and trans run about the same temp. The highway is a completely different story. The trans takes a long time to warm up and runs way cooler (150 to 160, 170 if ambient is over 100) than the engine, which stays on the thermostat (185 or so). The highway condition was anticipated and is why I used the factory trans cooler in addition to the external. The idea being to put some water heat in the atf to keep it from being too cool at high speeds. I was hoping for some additional heat exchange the other way at low speeds though (the ATF taking some water heat). Now being that the stock and aftermarket trans coolers are of different size and efficiency, I had no idea what to expect but the results are much less than desired. I was really hoping for consistency and slightly better cooling more than anything.



I'm just guessing here that the increased hot air flow from the trans cooler coming across the radiator with the more robust ZJ fan clutch is aggravating the stop and go and Idle condition. My air conditioner seems to be oblivious though. Until I get to the high of the highs, it still blows ice cold as it always has and is the requirement for our area.


Now I'm leaning towards a "better" radiator. I have avoided one thus far because of the interwebs horror stories and a little prior experience with a Dodge pickup that got hotter and hotter as the radiators got bigger and aluminumer.


Are you experiencing the desired consistent cool temps or do you have wild fluctuations like me?
Reply With Quote
  #35  
Old October 8th, 2018, 08:10
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 11,856
Re: Switching to AN fitting for auto trans

My temps after the trans cooler re-do were very stable maybe fluctuating about 5* under different load conditions. Since then I added a power steering cooler which I thought might add to the heat loading, but I also since that install, have changed my injectors again and had my PCM tuned with a change in the electric fan "turn-on" temp. Now it just makes to 210* with Zero change under any conditions!
https://naxja.org/forum/showthread.php?t=1148990
Reply With Quote
  #36  
Old October 8th, 2018, 11:30
98xjaz 98xjaz is offline
NAXJA Forum User
 
Join Date: Nov 2014
Location: AZ
Posts: 5
Re: Switching to AN fitting for auto trans

That's what I'm looking for. I did the 4 hole injector swap about 30k miles ago and it did run cooler after that.
We had our first little cool spell yesterday. I did 65 freeway miles this morning and the trans only got up to 135. The engine of course was nice and cool too. I will probably have to ride like this for the winter until I can save up for a fancy radiator. A fender bender last week put me in the need for a wheel and 2 tires so that will soak up the cash for a little bit aaaand then Christmas with 3 wee ones running around.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Loose and leaking trans line fitting rmonte4812 OEM Tech Discussion 9 May 30th, 2011 20:26
Trans temp gauge FITTING ParadiseXJ OEM Tech Discussion 9 March 20th, 2008 11:27
Trans line fitting egon OEM Tech Discussion 3 February 21st, 2004 19:54
does downshifting with an auto trans to slow or brake hurt the trans lapaul OEM Tech Discussion 12 February 21st, 2004 09:26


All times are GMT -7. The time now is 04:20.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014