First year for xtra speedo digit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mgchevyparts · 12-12-2013, 01:34 AM

What year did the extra digit on the odometer start?

ray_mcavoy · 12-12-2013, 01:56 AM

I believe it was at the same time they went to the electric (instead of cable driven) speedometers ... 1990 & 1991 R/V series.

lha1992 · 12-12-2013, 01:58 AM

It was in 1990 they started doing that on the R/V series trucks. Already the C/K series (88-98) had the extrab digit.

83GMCK2500 · 12-12-2013, 02:02 AM

My 83 has a 6-digit odo but I know my speedo has been replaced...twice I think. I've seen several mechanical 6-digit odo speedos.

Rubble · 12-12-2013, 10:23 AM

It was at least 85, maybe before.My 85 has 6 digits & it's original speedo.

MalibuSSwagon · 12-12-2013, 11:00 AM

My 86 C10 has it's original 6 digit speedo. I also have an 85 C60 speedo with 7 digits.

Ski-me · 12-12-2013, 01:07 PM

Is there a difference from miles vs kilometers?

I'm only aware of the 1/2, 3/4 ton pickups, Blazers, Suburbans having 5 digits (no 100,000 number) up to 1989. And then 1990 on up had the extra digit. This goes for the R/V series in the 89-91 era.

Keith Seymore · 12-12-2013, 01:15 PM

Quote:

Originally Posted by Ski-me

Is there a difference from miles vs kilometers?

No. Within the specific cluster housing there is no architectural difference; only labeling and calibration.

K

MalibuSSwagon · 12-12-2013, 01:36 PM

1985 C60 speedo, cable drive type.

Not sure if all big trucks of that era had them.

motornut · 12-12-2013, 05:53 PM

My Suburbans were
my 87 i believe was 5-in kms
88 is 5- in miles
89 is 6-in kms
I used the 87 cluster for quite a while was plug and play

mgchevyparts · 12-12-2013, 08:01 PM

Doing some research on this and it appears that the years were all over the place. I would have thought there would be a specific year this took effect but appears not to be.

ray_mcavoy · 12-12-2013, 08:18 PM

[quote=MalibuSSwagon;6414800]1985 C60 speedo, cable drive type.

Well, I've got to say that I certainly learned something new from this thread

As I posted above, I always thought they added the extra digit when they went to electric speedometers.

Quote:

Originally Posted by MalibuSSwagon

Not sure if all big trucks of that era had hem.

After seeing this one you posted, I took a look through my stash of spare parts. And sure enough, I found a couple of medium duty clusters with cable drive speedometers that have the extra digit in the odometer just like yours. They were both the 80's style 85 MPH speedometers. I have yet to see an older 70's style 100 MPH speedometer with the extra digit though. So there's a good chance that most (if not all) of the big trucks had the extra digit starting sometime in the early 80's.

I'm still curious about the 1/2, 3/4, and 1-ton trucks though. I guess speedometer swaps (from medium duty trucks) could account for some of them. And I wouldn't be surprised if some dealer-installed GM service replacement speedometers had the extra digit too.

motornut · 12-12-2013, 09:03 PM

not sure when, but I've wondered if we did the 6th first in Canada cause Km go faster then miles

Zane M · 12-13-2013, 08:26 AM

My 87 V20 has the 5 digit odometer.

Ski-me · 12-13-2013, 10:51 AM

Quote:

Originally Posted by motornut

not sure when, but I've wondered if we did the 6th first in Canada cause Km go faster then miles

^^^ this is what I was thinking.

v30crewcab · 12-13-2013, 08:22 PM

my 88 v30 has the 5 digit. its been turned over twice since i've owned it!

12-12-2013, 01:34 AM	#1
mgchevyparts Registered User Join Date: Feb 2013 Location: Upland, Calif Posts: 698	First year for xtra speedo digit What year did the extra digit on the odometer start? __________________ 1957 CHEVY 1/2 TON SHORT BED 1940 FORD 1/2 TON SHORT BED

12-12-2013, 01:56 AM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,373	Re: First year for xtra speedo digit I believe it was at the same time they went to the electric (instead of cable driven) speedometers ... 1990 & 1991 R/V series.

12-12-2013, 01:58 AM	#3
lha1992 Registered User Join Date: Apr 2010 Location: Everett, WA Posts: 504	Re: First year for xtra speedo digit It was in 1990 they started doing that on the R/V series trucks. Already the C/K series (88-98) had the extrab digit.

12-12-2013, 02:02 AM	#4
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: First year for xtra speedo digit My 83 has a 6-digit odo but I know my speedo has been replaced...twice I think. I've seen several mechanical 6-digit odo speedos. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96

12-12-2013, 10:23 AM	#5
Rubble Registered User Join Date: Feb 2012 Location: Big Valley. Alberta Posts: 674	Re: First year for xtra speedo digit It was at least 85, maybe before.My 85 has 6 digits & it's original speedo. __________________ 1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution"

12-12-2013, 11:00 AM	#6
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: First year for xtra speedo digit My 86 C10 has it's original 6 digit speedo. I also have an 85 C60 speedo with 7 digits. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

12-12-2013, 01:07 PM	#7
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: First year for xtra speedo digit Is there a difference from miles vs kilometers? I'm only aware of the 1/2, 3/4 ton pickups, Blazers, Suburbans having 5 digits (no 100,000 number) up to 1989. And then 1990 on up had the extra digit. This goes for the R/V series in the 89-91 era. __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

12-12-2013, 01:36 PM	#9
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: First year for xtra speedo digit 1985 C60 speedo, cable drive type. Not sure if all big trucks of that era had them. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

12-12-2013, 05:53 PM	#10
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: First year for xtra speedo digit My Suburbans were my 87 i believe was 5-in kms 88 is 5- in miles 89 is 6-in kms I used the 87 cluster for quite a while was plug and play __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

12-12-2013, 08:01 PM	#11
mgchevyparts Registered User Join Date: Feb 2013 Location: Upland, Calif Posts: 698	Re: First year for xtra speedo digit Doing some research on this and it appears that the years were all over the place. I would have thought there would be a specific year this took effect but appears not to be. __________________ 1957 CHEVY 1/2 TON SHORT BED 1940 FORD 1/2 TON SHORT BED

12-12-2013, 09:03 PM	#13
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: First year for xtra speedo digit not sure when, but I've wondered if we did the 6th first in Canada cause Km go faster then miles __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

12-13-2013, 08:26 AM	#14
Zane M Registered User Join Date: Dec 2006 Location: SLC, UT Posts: 706	Re: First year for xtra speedo digit My 87 V20 has the 5 digit odometer.

12-13-2013, 08:22 PM	#16
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 987	Re: First year for xtra speedo digit my 88 v30 has the 5 digit. its been turned over twice since i've owned it! __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

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