Installed 4.56 gears and speedometer is off
 

2000 GMC Z71 and I like the shift points where they are, but need speedometer to read right ..... what do you guys do?

I have been thinking about buying an HP Tuners, but don't really want to spend the $650 right now.

What would be a good cheap way to change the speedometer?

THANKS!

Take your truck to a dyno tuner or transmission shop with the ability to reprogram the ecu to the new gears. Call around, it shouldn't cost much to get that done.

I have no idea how accurate you could get it bottom to top, but I suppose a cheap dirty way would be to reposition the needle on the speedometer. It may take a long time to get right and wouldn't be 100% correct, but cheap and dirty........

Find a cheap used hand held tuner and try to change the tire size.not sure how well it would work being gears and not tires. Maybe that would get it close or find someone that has hp tuners.

Thanks for the replies, I guess I will go ahead and shell out for the HP Tuner if nobody around here can do it for me for a fair price ..... The only dyno tuner around here will want to gig me good!

There's no need to get on the dyno to change gear size in the ECU, they can just plug in with EFI Live to make the adjustment, should take like 15 minutes. A couple days ago I went to my tuner and had him make adjustments for the new stall tc and shift kit, I was only charged $50

Does EFI live lock the VIN so other tuners cant change it back?

I just found out that if I use HP Tuners it costs 2 credit ... $100

I'm not sure. Hopefully someone can chime in with more knowledge

gears
 

most hand tuners will let you
change tire size and gear ratio,
check e-bay for a cheap tuner,
you can change tires, gears any time
you want and adj for it yourself.

why not just get it tuned? there're a plethora of great tuners on here (BlackBear, Wheatley, Atomic, just to name a few) who can all do mail-order stuff or write something from a live scan & all for cheaper than buying HPT or EFI and having to learn it yourself... and your truck will run a LOT better