So let me understand what you have .... 1976 Chevy Luv with an electronic speedometer?
I'm thinking a 1976 Chevy Luv would have a mechanical speedometer cable?
Maybe you have an aftermarket electronic speedometer that has installation instructions?
dave w
No, a 76 Chevy LUV with 95 Chevy S10 running gear. All stock EFI, computer, the works.Originally Posted by dave w
The 1995 S10 with 4.3 TBI / Manual trans uses ECM 16151140 or ECM 16184738 http://www.gearhead-efi.com/Fuel-Inj...1&d=1390016979
dave w
Yes, but the question is, can I bypass the DRAC and got directly from the VSS to the speedometer?
The speed signal from the transmission will be in the neighborhood of 40 pulses per driveshaft revolution. The DRAC changes that signal into a multiple of 2000 pulses per mile for the speedometer. In the case of the Vin W engine in '95 I believe the PCM did this job for the speedometer rather than a DRAC.I have a electronic speedometer I am having trouble making work. Because I don't have ABS or an automatic can I bypass the DRAC and just run the signal from the VSS directly to the speedometer?
Why are you wanting to skip the DRAC?
Computer 16151140 or Computer 16184738 will not use a DRAC.
Computer 16197427 uses a DRAC.
Please post your computer number, so we can be 100% correct with an answer. 1995 is an odd ball year! Without the computer number, we just don't know the correct answer!
dave w
I am not sure I have the right DRAC. When I bought a new EFI harness from Ron Francis wire works the harness would not work with the oddball ECM the truck came with. (apparently Chevrolet was in a transition year going from OBD 1 to OBD 2 in 95) They also sent me a harness for an automatic (my mistake). They gave me a number for the computer that would work with their harness. I also have a 5 speed manual tranny. I searched the wrecking yards for a DRAC that came with a manual trans and the only one I could find was from a 4 banger and not the 4.3 V6 like I have. So I am not sure I have the right DRAC and thought that might be the problem.
Thank you for the explanation. The DRAC can be reprogrammed so if you need one the four cylinder DRAC should work even if it requires modification.
The real question imo is whether or not the computer required to work with your engine will work with the harness. Do you have a throttle body injection engine or the mpfi engine?
My computer number is 16197427 with a BDXR chip. I have TBI injection. The truck runs good. Just having problems with getting the speedo to work.
Ebay has well over 100 listings for used DRAC's / VSSB's: https://www.ebay.com/sch/6000/i.html...w=vssb&_sop=15
DRAC / VSSB information: http://614streets.com/drac.html & http://tbichips.com/?page_id=504
dave w
If you'd like to try and adjust your DRAC, here is the information to DIY:
http://gearhead-efi.com/gearhead-efi/doc/DRAC2.pdf
Hi Guys,
Really good info in this thread. I have never had to mess with any DRAC stuff and I've got a project to dive into. It's a 56 ford with a '94 Whipplecharged 7427 but has a 700r4 behind it. Of course the aftermarket digital dash speedo doesn't work as well as no speed to the 7427. I think it has a cable drive now. I've heard of cable drive adaptors for the vss output but don't know anything about them. Is that a standard 40 ppr item or are they all different? Should I or is it possible to put the output stuff off of a 4l60e onto the output shaft of the 700r4? Does the 7427 just need 40ppr signal or does it need the 2000 ppm signal or both? I'll check if the aftermarket electronic speedo can use either signal or a specific. Maybe I don't need a drac module???
Sorry guys, this is just basic stuff to some of you that have been through it. I'm trying to wrap my head around it all
-Carl
-Carl
Hello,
This has a Dakota digital dash. There is a 2 wire speed sensor coming out of the t700, appears to be part of the Dakota kit and hooks to the Dakota dash. From what I read, there is a 2000ppm wire coming out of the Dakota dash. Is this as simple as Programming the Dakota dash to get the speedo correct then hook their 2000ppm wire to pin F13 of the 7427 blue connector and no need for drac/vssb?
Last edited by In-Tech; 03-06-2020 at 09:34 PM.
-Carl
If you need switches I have extras...
I have a Dakota Digital dash in my 88 C1500 with the 700r4 trans which already has the 2000PPM encoder but my ECM (7747) still got the original pulses from the VSSB adapter on the back of my instrument cluster so, when I changed the rear end to 4.11 from 3.42 my ECM was off. I could not confirm whether the out put from the DD was a pass through or it converted pulses once the DD speedo was calibrated. Before I pursued it further I switched to the EBL Flash2 which has the ability to calibrate it internally. Maybe if you called tech support, they could help?
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