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  #1  
Old February 11th, 2020, 09:23
JonnyCat63 JonnyCat63 is offline
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AW4 Over-ride Switch

In my previous "Another gearing thread", someone responded and recommended an over-ride switch for the AW4. I've often thought about doing this, but I just wanted some clarification and understanding.

I often find myself crawling too fast downhill because the AW4 wants to go into 2nd gear.

Is that one of the purposes of the over-ride switch, to allow for more slow speed crawling downhill by keeping it in 1st? That's my ultimate goal.

Also, I think Montana Fab still makes them. Anyone using it? Comments?

Feel free to elaborate with any info. I appreciate the insight. Thanks!
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  #2  
Old February 11th, 2020, 09:45
RCP Phx RCP Phx is offline
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Re: AW4 Over-ride Switch

I also bought and installed the TransGo shift kit with the 2nd gear lock-out option so now it doesn't tend to run-away when going downhill and the compression braking actually holds.
https://naxja.org/forum/showthread.php?t=1147175
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  #3  
Old February 11th, 2020, 10:05
Black1990jeep Black1990jeep is offline
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Re: AW4 Over-ride Switch

Yeah, thats the goal, to lock it in 1st. Mine was done by prior owner, just an added switch and some wire changes.
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  #4  
Old February 11th, 2020, 10:36
RCP Phx RCP Phx is offline
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Re: AW4 Over-ride Switch

There's no comparison in benefits between a "shift kit" and a "shifter" besides gear selection though.
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  #5  
Old February 11th, 2020, 11:26
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lazyxj lazyxj is offline
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Re: AW4 Over-ride Switch

About 15 years ago, I tried adding a gear lock switch to my 2001 XJ, It did not work correctly, instead it set a CEL and caused the transmission go into limp-home mode.
Unlike the older AW4s, later model AW4s have an added speed sensor on the input side of the trans that causes problems, when locking a gear, that needs to be solved through electronics.

Installing the Montana Fab switch allows locking the trans into 1st or 2nd without causing any problems or CELs.
It still work great all these years later, primarily used on steep downhills where keeping the trans in a particular gear is crucial .
https://montanafab.com/product/aw4-override-switch/



Before installing it, I have almost lost it a couple times on steep, loose downhills where the trans suddenly downshifted from 2nd into 1st, causing the rear end to slide sideways, coming close to rolling over .
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Both XJs are still Real XJs http://www.naxja.org/forum/showthrea...hlight=real+XJ
01 Sport, Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
1997 Country, Mostly stock, 2" lift, Engine mods, NP242, Towing baseplate
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  #6  
Old February 11th, 2020, 12:08
RCP Phx RCP Phx is offline
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Re: AW4 Over-ride Switch

The TransGo kit is the cheapest and provides transmission benefits/up-grades you don't get with a shifter.
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  #7  
Old February 11th, 2020, 18:27
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lazyxj lazyxj is offline
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Re: AW4 Over-ride Switch

Quote:
Originally Posted by RCP Phx View Post
The TransGo kit is the cheapest and provides transmission benefits/up-grades you don't get with a shifter.
If all you want is to control what gear the transmission is in, it's much easier installing the Montana Fab kit than a shift kit and a lot less likely to have problems afterwards.
You reported problems when you installed a TransGo kit a couple years ago and had to disassemble the valve body several times.
You needed the shift kit to firm up the soft shifts caused by the big increase in power of your new stroker.
A stock engine doesn't need a shift kit
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Both XJs are still Real XJs http://www.naxja.org/forum/showthrea...hlight=real+XJ
01 Sport, Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
1997 Country, Mostly stock, 2" lift, Engine mods, NP242, Towing baseplate
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  #8  
Old February 11th, 2020, 19:06
RCP Phx RCP Phx is offline
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Re: AW4 Over-ride Switch

But the firmer shifts dropped my trans temps which dropped my radiator temps by +10 degrees also, the installation issue was a "strange fluke" that just happens sometime, been good for 2yrs since.
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  #9  
Old February 12th, 2020, 13:36
dktool dktool is offline
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Re: AW4 Over-ride Switch

This is what I did on my '98 .........


<a data-flickr-embed="true" href="https://www.flickr.com/photos/22609559@N05/49523136736/in/dateposted-friend/" title="20200211_131826"><img src="https://live.staticflickr.com/65535/49523136736_44e6761e3f_k.jpg" width="1152" height="2048" alt="20200211_131826"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>


The rotary switch selects all fwd gears, including t/c lock for 3rd and 4th, the toggle switch is used for 2nd gear t/c lock, 1st gear t/c lock is not obtainable due to the valve body internal plumbing.
Yes it sets a CEL but when control is returned to the TCM (I have another hidden switch that selects TCM or hand switch mode) the fault clears withing a few miles.
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  #10  
Old February 12th, 2020, 13:38
dktool dktool is offline
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Re: AW4 Over-ride Switch

Try the pic again .......


20200211_131826 by dktool, on Flickr
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  #11  
Old February 12th, 2020, 14:29
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lazyxj lazyxj is offline
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Re: AW4 Over-ride Switch

Quote:
Originally Posted by dktool View Post
This is what I did on my '98 .........
The rotary switch selects all fwd gears, including t/c lock for 3rd and 4th, the toggle switch is used for 2nd gear t/c lock, 1st gear t/c lock is not obtainable due to the valve body internal plumbing.
Yes it sets a CEL but when control is returned to the TCM (I have another hidden switch that selects TCM or hand switch mode) the fault clears withing a few miles.
I like how that looks.
I tried the traditional way of wiring for a second gear lock.
http://gojeep.willyshotrod.com/HowtoAutoSwitch.htm

In my 2001, it caused the trans to go into limp mode where it doesn't shift correctly and it set a CEL that would not clear on its own, needing a scanner too clear.
I believe the 2000-2001 XJs computers have different programing than the earlier models. 1998 to 2001 AW4s have an input speed sensor.

Would be cautious using the torque converter lock when descending steep hills, the torque converter's lock-up clutch surface is small and was never designed for such a stressful application.
__________________
Both XJs are still Real XJs http://www.naxja.org/forum/showthrea...hlight=real+XJ
01 Sport, Russ Pottenger 4.6, AW4, 4" lift, 33 X 10.50 KM2, 4.56-8.25 TruTrac, D-30-E-Locker with alloy shafts, Hidden M8000 winch, Vanco front and ZJ rear disc brakes, Frame stiffeners, Lots of armor, Towing baseplate. http://www.flickr.com/photos/lwade/c...7603770130683/
1997 Country, Mostly stock, 2" lift, Engine mods, NP242, Towing baseplate
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  #12  
Old February 12th, 2020, 15:01
dktool dktool is offline
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Re: AW4 Over-ride Switch

Quote:
Originally Posted by lazyxj View Post
Would be cautious using the torque converter lock when descending steep hills, the torque converter's lock-up clutch surface is small and was never designed for such a stressful application.
I only use the lock up for a gear spliting effect off road, when on the highway it is used the same way the tcm would use it.

I actually drive in manual mode on the highway a lot. I like shifting !
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