Six_Shooter

iTrader: (2)

I'm using a painless VSS (2 pulse older version of the 60115), I am using a 16197427 PCM to run a Crossfire equipped 305 and 4L60E, in a 1971 Chev pick up.

The only issue I have (other than the fuel pump dieing on me earlier today), is that the ECM does not read a VSS signal.

I have used this VSS with a 1227747, with one wire connected to ground, the other connected to the optical input, it worked fine then. I also had it connected to a 1227730 running S_AUJP for a short while before the owner of that vehicle got the 4ppr VSS, also a painless.

I am using $0D, and have the "VSS not from DRAC" bit selected, since that's what some threads on here indicate needs to be done when this PCM is swapped in place of a '7747.

I am using this VSS due to needing the cable drive for the trucks original speedo.

Now the only thing I haven't tried yet, that came to me after coming home and leaving the truck on the hoist until I get a new pump in the morning, is adding a pull up resistor.

Has anyone used this combination before? Any insight?

Six_Shooter

iTrader: (2)

Upon more research (some information was already saved on my HDD :facepalm: ), it seems that the 40pulse per revolution signal is needed for tranny functions to work properly.

Arg, this means find a, by the sounds of it rare, VSS that has a cable drive as well, or adding a 40 tooth wheel and sensor to the diff.

EagleMark

I have seen them somewhere... maybe Jags that run... turbocity... if I remeber or see it I will forward you the info.

EagleMark

Here you go!
http://www.jagsthatrun.com/Pages/Spe...eedometer.html

Six_Shooter

iTrader: (2)

Yeah, been on that site.

I'd rather find something cheaper and local if I can.

71403

If labor time/cost isn't an object the cheapest fix would be speedo gut swap. Electronic speedo guts from a 90's old-body 4l80E van are fairly compact.

At $250 for a Cable-X I just think of it as a $250 shift kit that gives the same shift every time, eliminates the evil TV cable, and no more ATF baths for trans calibration changes.

Six_Shooter

iTrader: (2)

There is no TV cable, this is a 4L60E...

It's a little late to go backwards now.

helo

The 4l60e should have the VSS you're missing for tranny control, you don't need an aftermarket VSS.

I assume it's a 4x4 and that's where you're getting the mechanical speedo cable from for the 2 pulse optical sensor in back of your speedo. That will work just fine for the cruise input and ECM VSS input, I'm using that setup with a 700r4. On a 4l60e or 4l80e the tranny VSS signal comes from a sensor on the tranny, not the transfer case (or tranny output shaft).

Six_Shooter

iTrader: (2)

--==Update==--

I ended up putting the 40 PPR reluctor wheel back in the tranny on the output shaft. I added a DRAC as well.

I haven't driven it yet, but my Grandfather drove it home from the shop and said that it felt smoother now that the PCM is getting a VSS signal. I think it's a bit low in reading, since the highest I saw on my test drive around the building was 7 MPH, and I'm sure I was going much faster than that. Now I just need to calibrate the DRAC.

Now I just need to get an electronic speedo. I may have one kicking around.

This is a 2WD Pro Street (look) 1971 Chev truck. Here is an old picture of it behind my Jimmy:

EagleMark

Ha! Your grandfather has a cooler car than you!!!

You would be right by saying it felt better with VSS. Every conversion I have done without then changed to with was better driving and very noticable stedier idle in gear etc... really noticed the differance on idle in a rock crawler I had. Much more stable idle and just off idle while crawling the rocks. now these were all 7747. I thought the 427 had to have VSS or it would go limp home or? Just from what I read, not sure. If you turn off the code for VSS on a 7747 it runs fine and never had a complaint, but then when added VSS it was better. HTH!