Square Body LS swap guys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big Port Jimmy 6 · 04-07-2011, 05:41 PM

I am having an issue with my speedo. I have a 90/91 burb cluster and it is about 30 mph slow. The Tech 2 indicates 30+ mph and the speedo is indicating approx 5-8 mph. Any body have to use a DRAC with one of these? Any body have a good place to have one of these checked or serviced? Jay

**Clyde65** · 04-07-2011, 05:44 PM

where is your speedo hooked up to? Vss off trans or right off the PCM?

If PCM, you think the gears/tire size is wrong?

Jonboy · 04-07-2011, 05:46 PM

I used the cluster in an LT1 swap, and it worked fine (once I got a good speedo). My first one, the odometer worked, the second one the speedo worked and the odometer didn't. I figured the odometer not working was the lesser of two evils. I talked to Bob about how he wired his with the LS swap, and it was running the VSS out on the PCM directly to the pin on the cluster; no DRAC. The PCM is the buffer rather than the DRAC. Sounds like a bad speedo. I work at a GM dealer, Speedometer Service and Specmo both wanted $200 to go through the cluster for repair. Cheaper to find another one in my case.

Big Port Jimmy 6 · 04-07-2011, 09:09 PM

The speed on the scanner is seat of the pants right. So the gear tire combo in the program is right. I guess the speedo head is bad. The PCM is hooked straight to the cluster input. Jay

87chevy.com · 04-07-2011, 10:07 PM

what about the gear ratio.. what program are you using?
clint

Big Port Jimmy 6 · 04-09-2011, 06:51 PM

I had Justin at black bear tune it. I don't want to have the ability to tune it, or I will tweak it until it breaks.

Jay

*Stitch* · 04-09-2011, 10:37 PM

Hey Jay, I have an electronic speedo gauge cluster. I just might have to make a trip to abbeville for a weekend vacation. Whatcha say? Give me a call buddy
Posted via Mobile Device

04-07-2011, 05:41 PM	#1
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Square Body LS swap guys I am having an issue with my speedo. I have a 90/91 burb cluster and it is about 30 mph slow. The Tech 2 indicates 30+ mph and the speedo is indicating approx 5-8 mph. Any body have to use a DRAC with one of these? Any body have a good place to have one of these checked or serviced? Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

04-07-2011, 05:44 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: Square Body LS swap guys where is your speedo hooked up to? Vss off trans or right off the PCM? If PCM, you think the gears/tire size is wrong? __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

04-07-2011, 05:46 PM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Square Body LS swap guys I used the cluster in an LT1 swap, and it worked fine (once I got a good speedo). My first one, the odometer worked, the second one the speedo worked and the odometer didn't. I figured the odometer not working was the lesser of two evils. I talked to Bob about how he wired his with the LS swap, and it was running the VSS out on the PCM directly to the pin on the cluster; no DRAC. The PCM is the buffer rather than the DRAC. Sounds like a bad speedo. I work at a GM dealer, Speedometer Service and Specmo both wanted $200 to go through the cluster for repair. Cheaper to find another one in my case. __________________ 1974 Jimmy- 5.3/4L80e/NP241

04-07-2011, 09:09 PM	#4
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Re: Square Body LS swap guys The speed on the scanner is seat of the pants right. So the gear tire combo in the program is right. I guess the speedo head is bad. The PCM is hooked straight to the cluster input. Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

04-07-2011, 10:07 PM	#5
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: Square Body LS swap guys what about the gear ratio.. what program are you using? clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

04-09-2011, 06:51 PM	#6
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Re: Square Body LS swap guys I had Justin at black bear tune it. I don't want to have the ability to tune it, or I will tweak it until it breaks. Jay __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

04-09-2011, 10:37 PM	#7
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: Square Body LS swap guys Hey Jay, I have an electronic speedo gauge cluster. I just might have to make a trip to abbeville for a weekend vacation. Whatcha say? Give me a call buddy Posted via Mobile Device

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