speedometer works only in 4wd 1990 Burbn? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72MARIO · 10-07-2013, 08:45 AM

Works to 90km about 55mph in 2wd If I get it faster and snap out of the throttle it will jump to speed. As soon as I put it in 4wd it works perfectly....any ideas ?

72MARIO · 01-07-2014, 10:37 AM

anyone ?

Ski-me · 01-07-2014, 12:53 PM

Check your speed sensor pickup on the T-case. I've seen a few posts on this type of issue lately. Also, check the twisted wire coming from the t-case to your DRAC module. Be sure there aren't any frayed wires. I'd probably try replacing the t-case sensor just for the heck of it. You might just find another one at the junkyard or a new one.....

http://www.autozone.com/autozone/par...2_20285_147510

72MARIO · 01-08-2014, 09:10 PM

That sounds like what I was thinking the abs light came on. I just tossed the abs computer I didn't care for the way it operated. If the speed sensor went bad that would make the abs computer throw the light on. Going to try and find a new one in the morning..
Thanks !

72MARIO · 01-08-2014, 09:12 PM

I should add that the speedo stopped working correctly in 4wd this week

10-07-2013, 08:45 AM	#1
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	speedometer works only in 4wd 1990 Burbn? Works to 90km about 55mph in 2wd If I get it faster and snap out of the throttle it will jump to speed. As soon as I put it in 4wd it works perfectly....any ideas ? __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-07-2014, 10:37 AM	#2
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: speedometer works only in 4wd 1990 Burbn? anyone ? __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-07-2014, 12:53 PM	#3
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: speedometer works only in 4wd 1990 Burbn? Check your speed sensor pickup on the T-case. I've seen a few posts on this type of issue lately. Also, check the twisted wire coming from the t-case to your DRAC module. Be sure there aren't any frayed wires. I'd probably try replacing the t-case sensor just for the heck of it. You might just find another one at the junkyard or a new one..... http://www.autozone.com/autozone/par...2_20285_147510 __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

01-08-2014, 09:10 PM	#4
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: speedometer works only in 4wd 1990 Burbn? That sounds like what I was thinking the abs light came on. I just tossed the abs computer I didn't care for the way it operated. If the speed sensor went bad that would make the abs computer throw the light on. Going to try and find a new one in the morning.. Thanks ! __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

01-08-2014, 09:12 PM	#5
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: speedometer works only in 4wd 1990 Burbn? I should add that the speedo stopped working correctly in 4wd this week __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD



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