93 pcm & 4l60e trans VSS question

[Greased-lightning]

Hello I have a wiring harness from a 1995 suburban
I have all new glowshift elctronic guages
Im Trying to wire up my vss to ecm and guage to ecu my wiring harness wires from the VSS do not match my ecm wire colors how should I proceed? And are these the two wires I need to connect to on the ecu

F-13
DK BLU
VSS Signal




F-12. BRN. Transmission output speed

[fastacton]

Normally there will be a DRAC or VSSB wired in between the two F12 & 13 would go to the VSSB and so would the VSS wires along with a +12v and Ground wires. The VSSB will have an output for your speedo as well.
9078

[Greased-lightning]

That's what I was afraid thank you

[Greased-lightning]

I replaced my speed meter with a glowshift speed meter it has the speed adjustment on the guage it's self does that take the place of the VSSB? If so does the ecu need a corrected signal from a VSSB?

[lionelhutz]

Does the gauge have an output for the PCM?

[Greased-lightning]

It's a one wire connection and the instructions said to splice into VSS sensor signal wire. it has a wave adjustment for the speed meter it's self I was concerned about the connection from the VSS to the ecm. I have the speedmeter covered trying to figure out if I need a VSSB for the ecu to read speed and control the transmission.

[lionelhutz]

Yes, you still need one.

[fastacton]

I have ran an inline cable drive VSS adapter with the 7427 and without the VSSB, but you're better off wiring it up right. Without a VSSB/DRAC, the speed signal going to the PCM can be off by quite a bit which can affect how the TBI performs as well as shifting/lockup. It's only a few more wires and the module isn't too difficult to find.

[Greased-lightning]

Thanks for the information, I'll start my search

[Greased-lightning]

Going to go dumster diving at the junk yard can I use any VSSB/drac with 14 jumpers?

[fastacton]

For a '93, you should be able to use any DRAC or VSSB. A DRAC will only have 7 jumpers but I've seen them used all the way up through '94. Best bet to find one is in a '92-95 full size truck behind the glove box. On a '95 it will be under the ECM and everything else will have it just below the glove box floor.

[Greased-lightning]

Ok I have a 4l60e auto transmission can I still use the 7 jumper drac? Found one in a junkyard for $35 from a 96 suburban/tahoo haven't went to get it yet

[fastacton]

I've seen the 7 jumper (DRAC) in plenty of '93 & '94 vehicles with 4L60E's, but I wasn't aware of their use past '94 and I didn't think any were used past '95. Is this a TBI vehicle or Vortec? I don't have any concrete info on when or why a VSSB needs to be used vs. a DRAC, but the only year I haven't seen the DRAC used is '95.

[Greased-lightning]

Talked to the junk yard guy on the phone he maybe confused on what I wanted exactly, thanks for the info you save me a trip to the junk yard I'll get a VSSB off of eBay

[ony]

someone on this sight had some for sale awhile back at the bottom of the login page.

[Greased-lightning]

Ok thanks

[fastacton]

It looks like you ended up purchasing from my shop. Thanks for your business! It'll ship out today and I'll throw the connector in with it.

[Greased-lightning]

Nice its a small world after all lol! Since it was yours I have a question I noticed yours was different than other 14 jumper switches. Others I saw the (on) switches were facing up yours the left side the (on) is facing down and right side facing up are both sides designed to mirror each other's settings? Also thanks for including the plugs that will save me from burning my self with the solder iron

[fastacton]

Yep, it is a small world! I use two 6 switch DIPs to mod a VSSB. The jumpers are normally numbered 1 thru 7 starting in the middle. Since the number 1 jumpers are not changed, I skip them and install one of the DIPs upside down to keep the numbering going from the inside out. I hope that makes sense, sometimes things sound better in my head. Instructions are included which show an example of the switches set properly. No problem on the connector, I try to give forum members a better value for their purchase when I can. I also upgraded it to Priority Mail.

[Greased-lightning]

Wow thanks I appreciate that another member is helping me with the tune it's been a couple of months and it was almost ready for a road data log. Thanks again for all the help

[brian617]

Here is some good info for DRAC/VSSB

http://www.gearhead-efi.com/gearhead-efi/doc/DRAC2.pdf

[Greased-lightning]

Thanks Brian that's more information than I was able to find.. Drac will be here tomorrow I'm installing the trans mission and timing up some loose wiring thanks for all the help guys

[fastacton]

Yeah, thanks Brian. That's one document I don't think I've seen all of before.