I've got a tbi350 in a Yj with sm465. Where can I get a Vss for it. how does it work and where does it go?

will this work?

http://store.summitracing.com/partdetail.asp?autofilter=1&part=RPC%2D250%2D4165&N=%2D123320+115&autoview=sku

you'll need to find out what frequency the tbi needs. may not even need one. i have a lt1 with a 700r4 with no vss. side effects are minimal. mine requires 40 pulses per driveshaft revolution which is not an easy bolt-on. jagsthatrun.com sells a 4 pulse/rev sensor that screws into the speedo output. im not sure what that summit part is...

I don't think the D300 ever came with one but I may be wrong, Howell has an adaptor for the D20 to go with their kits which use the GM TBI, try them. They told me I wouldn't need it for mine unless I live in Cali and needed to be smog legal, which it looks like you may need to be.

Good luck

I finished a TBI 5.7 install on my YJ a couple of months ago. I used a Painless VSS (http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRF%2D60115&N=0&autoview=sku). It installs inline with the speedomoter cable and provides the required 2 pulses per revolution. It is also weatherproof and out of harms way.

Another place you might try. I think no. 01-1 will fit a dana 300. http://www.dakotadigital.com

Ding Ding Ding.... Don T's the winner!
I finished a TBI 5.7 install on my YJ a couple of months ago. I used a Painless VSS (http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRF%2D60115&N=0&autoview=sku). It installs inline with the speedomoter cable and provides the required 2 pulses per revolution. It is also weatherproof and out of harms way.

the dakota looks good in price but what is the pulse count?

you'll need to find out what frequency the tbi needs. may not even need one. i have a lt1 with a 700r4 with no vss. side effects are minimal. mine requires 40 pulses per driveshaft revolution which is not an easy bolt-on. jagsthatrun.com sells a 4 pulse/rev sensor that screws into the speedo output. im not sure what that summit part is...

you'll want a VSS with a manual tranny. You can drive without it but when you try to downshift while your foot is off the gas, the computer will try to slow the motor down by backing the idle speed down with the IAC (even though the engine is still moving fast because of the downshift). As soon as you push the clutch in, the engine will be try running at a minimal idle and will sometimes stall before the IAC can speed the motor up to the proper idle speed. You need the VSS with a manual because it tells the computer that you are downshifting so the computer won't try to adjust the idle speed.

Oh yeah, Jagsthatrun.com is where I got my sensor...screwed right into my D300 between the speedo cable and transfercase. You won't need to worry about the frequency but you will need to know if you need a square wave or sine wave style sensor. Check out the link for more info.

http://www.jagsthatrun.com/Pages/SpeedSensors_Speedometer.html

You need the VSS to be SMOG legal, as well as to get the ECM to interact correctly with the engine. Which VSS type depends on what ECM you're using. ECM's that are intended for the electronic controlled trans (4L60e) requires 40K pulses per mile, and a DRAC--a solid state unit that converts the 40k pulses into a number of different frequencies, and conditions the AC sign-wave signal (turns them into pulses)--the Summit racing VSS you sited would not work--you'd need the reluctor type (AC sign wave). ECM's for the 700R4 or a manual trans, require the 2K pulses per mile type. These give you pulse of 0 and 12v. The summit one is a good price, especially if it's a "2-pulse" unit. I paid more than that just for the short speedo cable extension! You need to know what the speedo cable nut size & thread pitch are, and the size of the cable end. I used Turbo City, Inc's unit along with an ECM intended for my '95 TBI350, manual trans install (calif SMOG legal). Their part number was 975-590, intended for the -7747 ECM. Price was $89.95! I also needed an extension cable to solve an interference issue between the VSS unit and my Atlas transfer case. That cost me another $60. The speedo cable connector on my Atlas (same as stock NP231) transfer case is 7/8-18. The drive section of the cable is .104 square.

Here's a great article on the speed sensors. You must have Adobe Acrobat to open this page:
http://www.jagsthatrun.com/V8-chapters/V8-tpi-Speed-Sensors.pdf

You can contact the at www.jagsthatrun.com
I get the feeling though that all you need is the two pulse. If you have the newer 40 pulse. You can do a search for DRAC module and reprogam it yourself for different tire sizes and final gear ratio's

If you have the typical -7747 computer, which is what I am using, the link I posted above will work fine for you . It is a two pulse square wave output. I have software to monitor the sensors wired to the computer and this VSS gives the proper signal that is converted to the correct speed in MPH by the computer. It is not cheap, but it works.

If you have the typical -7747 computer, which is what I am using, the link I posted above will work fine for you . It is a two pulse square wave output. I have software to monitor the sensors wired to the computer and this VSS gives the proper signal that is converted to the correct speed in MPH by the computer. It is not cheap, but it works.
I don't understand why you need software to convert the signal unless you're using an electronic speedometer. The 7747 only needs to know whether the vehicle is moving or not. It's not capable of shifting the transmission, or any other function that would require defining the actual speed.

Anyone know if they make a VSS that goes inline right before you speedo (instead of on your Tcase)-it would make more sense to install one there-the wiring is closer and its out of harms way....

I don't understand why you need software to convert the signal unless you're using an electronic speedometer. The 7747 only needs to know whether the vehicle is moving or not. It's not capable of shifting the transmission, or any other function that would require defining the actual speed.

Sorry for the misunderstanding. You are correct in that the ECM only needs to know the vehicle is moving in order to do it's work. I am only saying that I have software that I can use to see the sensors, including the VSS input to the ECM, to aid in troubleshooting. The software (WinALDL) just happens to convert the sensor signals to meaningful numbers to reference. In this case, it converts the VSS pulses to MPH, and by seeing that I know the above linked VSS, that I have on my jeep, does in fact send the correct signal to the ECM.

wow thats alot of info. thanks guys. I'm glad I asked instead of just purchasing. I also like the idea of putting it on the other end of the cable. Can I retrofit the speedometer out of the truck that it came out of? I belive the original vss is connected to the back of it. It's from a 87 chevy 1ton that also had the 465 and the 7747 computer.

Later model GM trucks/cars (starting in '92) use a reluctor (coil over medal rod set close to revolving toothed ring) to convert shaft rotation into speed data. The output is a sign wave that the computer cannot read. These later vehicles also have a "black box" that modifies the sign wave to pulses, or digital data that the computer can read. The black box is referred to as a "VSS sensor buffer", or "DRAC", Digital Ration Adapter Controller Calibration). You need the reluctor sensor and the buffer if your going to use an electronic controlled tranny. If your using an early-er auto or a manual trans, then an aftermarket VSS sensor is all you need. It's output can be directly read by the ECM, and satisfies the ECM's vehicle speed data requirements.
Some early-er trucks/cars used a speedometer that had an optical reader built into the speedometer to give the ECM its VSS data.

wow thats alot of info. thanks guys. I'm glad I asked instead of just purchasing. I also like the idea of putting it on the other end of the cable. Can I retrofit the speedometer out of the truck that it came out of? I belive the original vss is connected to the back of it. It's from a 87 chevy 1ton that also had the 465 and the 7747 computer.
Yes!

Sorry for the misunderstanding. You are correct in that the ECM only needs to know the vehicle is moving in order to do it's work. I am only saying that I have software that I can use to see the sensors, including the VSS input to the ECM, to aid in troubleshooting. The software (WinALDL) just happens to convert the sensor signals to meaningful numbers to reference. In this case, it converts the VSS pulses to MPH, and by seeing that I know the above linked VSS, that I have on my jeep, does in fact send the correct signal to the ECM.
Understood, I use Datamaster for my datalogging. I know they're lots of folks using WINALDL though.

I'm using a SM465 so the aftermarket one is probley the best way to go. I have the speedometer from the old truck but I have'nt looked into making it fit.

One other thing that should probably be mentioned here. It's critical that you keep the VSS signal wires clear of those going to the distributor. They will interupt the timing signal.

I've been told that GM trucks with cruise control like my K10 have a VSS of some sort installed.

If anyone knows how to hook to it, I'd be interested in knowing. When I get my TBI in, I'm going to tear into the dash to try to find it.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=RPC%2D250%2D4153&N=400615+317078+4294908216+115&autoview=sku

If all else fails, i bet that'll work.

don't some of the p30 step vans with the tbi use a inline vss mounted on the frame of the van?

Try this link for VSS: http://www.magsensors.com/vss.html

They do answer email questions.

Try this link for VSS: http://www.magsensors.com/vss.html

So this is telling me I can use the one from dakota for around 25 bones Right?