The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)

- - Speedo help (https://67-72chevytrucks.com/vboard/showthread.php?t=316972)

worthirt_99

11-30-2008 05:46 PM

Speedo help

Ok, I changed my speedo gears again and my speedo is still off. The only thing that I havent chaned is the speedo it self because it was working. I have a 85 C10 with a 700R4. The gears I have in the tranny now are a 35 and a green(18 I think) with a standard rear axle 2.76 I think.

edit: my speedo is reading approx 5 MPH slow

N2TRUX

11-30-2008 08:27 PM

Re: Speedo help

Have you looked at Bowtie Overdrives site? They should be able to tell you what gears you need- LINK

staggerd86c-10

11-30-2008 08:44 PM

Re: Speedo help

i got 3.73s in my rearend and i want to know what gears i need for my truck to have a accurate speedo, should i do this now or wait till i change the wheels and tires completely.

1984 swb chevy

11-30-2008 09:19 PM

Re: Speedo help

Not all speedos are accurate. How are you checking your speedo to know that you are 5 mph slow. I know with motorcycles they can be off up to 3 of 4 mph and still fall into spec. I'm sure cars and trucks would be the same. Did you change tire size?.

spr85gmc

11-30-2008 09:38 PM

Re: Speedo help

since i put my22's on my truck my speedo is off like crazy need info on this too ....

worthirt_99

11-30-2008 10:08 PM

Re: Speedo help

Quote:

Originally Posted by 1984 swb chevy (Post 3001289)

5 MPH at 15 MPH, that's a little much in my book. Oh and I have access to a radar gun.

All times are GMT -4. The time now is 04:00 AM.