2000XJ AW4, I am wrapping up my doubler-D300 swap. I accidentally bought a short shaft D300 instead of the long shaft so I can't swap my 231 spedo into the D300. My rig is more or less trail only, any issues with just leaving the speedo harness off and giving up on the guage or will I suffer other issues as well? Rad designs shifter so not too worried if it will affect shifting.
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run ok without speed sensor
- Thread starter jonzer12
- Start date
clean4drxj
NAXJA Forum User
- Location
- CT.
You could but it will probably tho a code for the cell light.
831_xj
NAXJA Forum User
- Location
- Santa Cruz
- Location
- Virginia City, NV
I have a feeling it will mess with shift points
- Location
- Torrance, CA
The trans has an output speed sensor that tells it when to shift.
- Location
- Virginia City, NV
Everybody says that but when i swap speedo gears to the right ones it changed the way and when the trans shifts in my 97. Just my experience.
- Location
- Rainy side of Washington
Shouldn't affect the trans, you'll get a DTC for VSS signal missing. Engine may run a bit odd coming to a stop, but that's mostly a mantrans thing on decel with clutch in, so it may not be an issue for you.
Why can't you put the VSS in? Just nowhere to put the drive gear on the output shaft? Because IIRC the d300 I have, the stock takeoff works with a long-shaft speedo gear, you just have to use an early 90s VSS with a pullup resistor to convert it from 2 pin reed switch style to 3 pin Hall effect style. It threads right onto the stock speedo cable takeoff on d300s. Maybe I'm just not familiar enough with d300s and you're speaking of a short output shaft with no worm gear for driving the speedo takeoff or something?
Why can't you put the VSS in? Just nowhere to put the drive gear on the output shaft? Because IIRC the d300 I have, the stock takeoff works with a long-shaft speedo gear, you just have to use an early 90s VSS with a pullup resistor to convert it from 2 pin reed switch style to 3 pin Hall effect style. It threads right onto the stock speedo cable takeoff on d300s. Maybe I'm just not familiar enough with d300s and you're speaking of a short output shaft with no worm gear for driving the speedo takeoff or something?
- Location
- In the islands
My speedo drive gear in the transfer case broke on the highway with the cruise control set on 75 MPH 50 miles away from home. With the cruise set like I said, resulted in the speed increasing suddenly up to (I think) 5 MPH then down to 60 then it tried to go back up, before slowing the engine to idle and throwing a code. I continued my trip out for another 100 miles then 150 miles back home. There was no problem that I could remember except a loss of speed indication and cruise control. My XJ is a 1996 cross breed version. Other years may be different. :dunno:
souske
NAXJA Forum User
- Location
- The land of competition
what rear axle are you running?
VAhasnoWAVES
NAXJA Forum User
- Location
- Lake City, Mi
most 8.8s run a tone ring behind the ring gear, with a sensor in the differential housing.
its been said that you can actually tap into that with some modification, and use it as a speedo gear... but never having interest in an 8.8, I never investigated it further.
its been said that you can actually tap into that with some modification, and use it as a speedo gear... but never having interest in an 8.8, I never investigated it further.
I have no cruise and the 8.8 does indeed have an abs sensor in the housing. I suppose rather than buying a vss for the 300 and adapting the output with a Dakota box I could just hook up the Dakota box up to the abs sensor instead. When I get around to this I will investigate. For now at least you guys make me think it run fine once I get some new driveshafts. Thanks again
- Location
- Rainy side of Washington
I believe that is the sensor I recommended actually. Not sure. I put a pullup resistor from the orange wire to the signal wire because I wasn't sure if the ECU had one built in or not and it wouldn't hurt.
There is also another one, which fits an 88-93 Dakota (not sure which engine) or early 90s YJ that has the same fitting, same electrical characteristics, and a 5/8-18 threaded output that can have a bushing threaded onto it (the one from a RENIX cruise control VSS works perfectly) to make it into a 7/8-18 threaded output to run a mechanical speedo, if you're putting, say, an EFI 4.0L that needs a VSS signal into a CJ/YJ or XJ/MJ that needs a mechanical speedo drive cable still.
There is also another one, which fits an 88-93 Dakota (not sure which engine) or early 90s YJ that has the same fitting, same electrical characteristics, and a 5/8-18 threaded output that can have a bushing threaded onto it (the one from a RENIX cruise control VSS works perfectly) to make it into a 7/8-18 threaded output to run a mechanical speedo, if you're putting, say, an EFI 4.0L that needs a VSS signal into a CJ/YJ or XJ/MJ that needs a mechanical speedo drive cable still.
- Location
- Rainy side of Washington
It's just a pull-up, since the 3 wire is a Hall effect sensor with a totem-pole type output driver (AFAIK) and the 2 wire sensor is just an open/closed SPST reed switch. I wasn't sure if the ECU had a built in pull-up resistor so I added one from the 3 wire sensor's VCC pin to the signal return pin and it worked. Given that yours works and is a 00 that would definitely throw a code if it didn't see a VSS signal, I suspect it's not necessary.
- Location
- Rainy side of Washington
Yep, that's all I did. I can't remember what size resistor I used, let me check my records real quick.
edit: it turns out I have no records of that. But let's just do some napkin math... assume the sensor runs on 5, 7, or 8 volts (can't remember which), and we don't want to pull more than like 10mA through the reed switch. So using Ohms law, 8V = 10mA * resistance, so minimum resistance is 800 ohms. I'd throw a 1k ohm 1/4 watt resistor in there and forget about it.
edit: it turns out I have no records of that. But let's just do some napkin math... assume the sensor runs on 5, 7, or 8 volts (can't remember which), and we don't want to pull more than like 10mA through the reed switch. So using Ohms law, 8V = 10mA * resistance, so minimum resistance is 800 ohms. I'd throw a 1k ohm 1/4 watt resistor in there and forget about it.
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I picked up a 330ohm 1 watt today but I guess I was way off. I will go back on Monday. Thanks so much for your time. This is way over my head so you are helping me out big time.
