Speedometer help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OJOE · 06-01-2007, 08:17 PM

put a 93 1500 350 auto together out of spare parts. now when the truck speedo points at 50 mph my gps says 60mph. talked to gm parts said i need tire size and rear gear and they would sell me a buffer for the speedo to correct this for about 170.00. anyone know a cheeper fix

OJOE · 06-01-2007, 08:24 PM

Quote:

Originally Posted by OJOE

put a 93 1500 350 auto together out of spare parts. now when the truck speedo points at 50 mph my gps says 60mph. talked to gm parts said i need tire size and rear gear and they would sell me a buffer for the speedo to correct this for about 170.00. anyone know a cheeper fix

sorry, maybe one of the mods will move this over to the 88-98 side. thanks joe

*trkklr77* · 06-01-2007, 10:36 PM

well its a vss sensor truck for starters, you might be able to adjust it by playing with the speedo drive gear in the tranny, if they even have them.

OJOE · 06-02-2007, 04:53 PM

Quote:

Originally Posted by trkklr77

well its a vss sensor truck for starters, you might be able to adjust it by playing with the speedo drive gear in the tranny, if they even have them.

what is a vss sensor? and there is no speedo drive gear in the trans, only a electronic p/u. i am kinda dumb on this, can you explain how to adjust this vss sensor. thanks

*trkklr77* · 06-04-2007, 11:54 AM

Quote:

Originally Posted by OJOE

what is a vss sensor? and there is no speedo drive gear in the trans, only a electronic p/u. i am kinda dumb on this, can you explain how to adjust this vss sensor. thanks

uh that would be a vehicle speed sensor.

OJOE · 06-04-2007, 09:19 PM

Quote:

Originally Posted by trkklr77

uh that would be a vehicle speed sensor.

maybe, vssb, vehicle speed sensor buffer (uh) anyway thanks for the great help!

*trkklr77* · 06-04-2007, 10:39 PM

Quote:

Originally Posted by trkklr77

well its a vss sensor truck for starters, you might be able to adjust it by playing with the speedo drive gear in the tranny, if they even have them.

Quote:

Originally Posted by OJOE

maybe, vssb, vehicle speed sensor buffer (uh) anyway thanks for the great help!

that is the vss, aparently they are not the same drive system as i had hoped. you will need the buffer OR you can adjust the computer on some systems. odb1 you might not be able to but odb2 deffinetly. you will need to get something like a power programer to do it.

Mickey_D · 06-02-2007, 05:40 PM

Didn't 93 use the DRAC? If so, you can take them apart and change the jumper settings.

Info here : clicky link

OJOE · 06-02-2007, 09:05 PM

Quote:

Originally Posted by Mickey_D

Didn't 93 use the DRAC? If so, you can take them apart and change the jumper settings.

Info here : clicky link

you are correct and thanks for the link, very helpfull info

**Hart_Rod** · 06-03-2007, 09:07 AM

Joe,

I had a 91 motor/tranny combo in my 34 Ford. It was a 305 TBI with a 700R4. The tranny had a VSS to provide input to the computer. But it also had the plastic gears in it that you could change to correct for speedometer. Here's a chart with the different gears:

http://www.transmissioncenter.net/sp...n_______va.htm

http://www.tciauto.com/Products/Comp...eter_gears.asp

http://www.enginebalancers.com/Produ...eedo_gears.asp

http://www.thirdgen.org/speedogear

Dakota Digital also make this:

http://www.dakotadigital.com/index.c...rod/prd126.htm

Instructions:

http://67-72chevytrucks.com/vboard/s...d.php?t=243548

OJOE · 06-03-2007, 07:33 PM

thanks rod, but mine does not have a gear, only has a magnetic pick up on trans

06-01-2007, 08:17 PM	#1
OJOE Crew Cut Join Date: Dec 2005 Location: MONTGOMERY,AL Posts: 757	Speedometer help put a 93 1500 350 auto together out of spare parts. now when the truck speedo points at 50 mph my gps says 60mph. talked to gm parts said i need tire size and rear gear and they would sell me a buffer for the speedo to correct this for about 170.00. anyone know a cheeper fix __________________ 85 SWB 1/2 TON CREWCAB/5.3 03 CHEV 3500 DURAMAX CREW CAB 85 CHEV SWB/TPI 06 CHEV TAHOE (WIFES) 30 MODEL A HOT ROD 07 HARLEY DAVIDSON BAGGER 09 STREET GLIDE AN D A LOT MORE JUNK

06-01-2007, 10:36 PM	#3
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 775	Re: Speedometer help well its a vss sensor truck for starters, you might be able to adjust it by playing with the speedo drive gear in the tranny, if they even have them.

06-02-2007, 05:40 PM	#8
Mickey_D Dirteh Kitteh Join Date: Nov 2006 Location: Mormon country Posts: 2,484	Re: Speedometer help Didn't 93 use the DRAC? If so, you can take them apart and change the jumper settings. Info here : clicky link __________________ Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL

06-03-2007, 09:07 AM	#10
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Speedometer help Joe, I had a 91 motor/tranny combo in my 34 Ford. It was a 305 TBI with a 700R4. The tranny had a VSS to provide input to the computer. But it also had the plastic gears in it that you could change to correct for speedometer. Here's a chart with the different gears: http://www.transmissioncenter.net/sp...n_______va.htm http://www.tciauto.com/Products/Comp...eter_gears.asp http://www.enginebalancers.com/Produ...eedo_gears.asp http://www.thirdgen.org/speedogear Dakota Digital also make this: http://www.dakotadigital.com/index.c...rod/prd126.htm Instructions: http://67-72chevytrucks.com/vboard/s...d.php?t=243548 __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

06-03-2007, 07:33 PM	#11
OJOE Crew Cut Join Date: Dec 2005 Location: MONTGOMERY,AL Posts: 757	Re: Speedometer help thanks rod, but mine does not have a gear, only has a magnetic pick up on trans __________________ 85 SWB 1/2 TON CREWCAB/5.3 03 CHEV 3500 DURAMAX CREW CAB 85 CHEV SWB/TPI 06 CHEV TAHOE (WIFES) 30 MODEL A HOT ROD 07 HARLEY DAVIDSON BAGGER 09 STREET GLIDE AN D A LOT MORE JUNK



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