CMAHON
NAXJA Forum User
- Location
- Arlington, TX
with a 6in lift and 35's how much will the speedo be off?
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lift vs. speed
- Thread starter CMAHON
- Start date
goodburbon
NAXJA Forum User
- Location
- Westcliffe Colorado.
jeep came with 27's
35-27=8
8/27=.29
If you are running stock gears your speedometer will read 30% slower than you are going.
I.e. when you are going 60 your speedo will say you are going ~40
35-27=8
8/27=.29
If you are running stock gears your speedometer will read 30% slower than you are going.
I.e. when you are going 60 your speedo will say you are going ~40
CMAHON
NAXJA Forum User
- Location
- Arlington, TX
wow that much. is that thru the entire range? i.e. speedo 10 actual 30 and so on
goodburbon
NAXJA Forum User
- Location
- Westcliffe Colorado.
speedo 20 actual 30
speedo 4 actual 6
speedo 10 actual 15
Yes it is a percentage skew
speedo 4 actual 6
speedo 10 actual 15
Yes it is a percentage skew
goodburbon
NAXJA Forum User
- Location
- Westcliffe Colorado.
easiest way to verify is by driving with a GPS and verifying speed.
CMAHON
NAXJA Forum User
- Location
- Arlington, TX
o.k. i get it now. thanks
- Location
- Rainy side of Washington
If you change your diff gears to something that will put the Tcase output RPMs in the same range, you'll be less inaccurate, and depending on a lot of stuff may put the drivetrain back to where the power curve will match up with when you need the most power. There are a few threads on this, I haven't had to worry about it yet. Your mileage will also likely improve a lot, at least on-road.
CMAHON
NAXJA Forum User
- Location
- Arlington, TX
i will soon get regeared to 4.56 so i dont want to buy speedo gears until i get that done. every little bit counts$$. but i also just needed to know what to compensate for till then so i don get pulled over all the time. i didn't think it would be off that much so i was doing 5-10 under but with the 30% thing that means i was doing 85-90 every where i went
!!!! not good
!!!! not good
- Location
- Rainy side of Washington
fair enough! I don't much enjoy getting pulled over either, and I imagine "officer my tires are so huge that my speedometer is way off" will probably get you a laugh and a ticket instead of just a ticket.
goodburbon
NAXJA Forum User
- Location
- Westcliffe Colorado.
Those figures might be off, what size tires did your cherokee come with from the factory?
CMAHON
NAXJA Forum User
- Location
- Arlington, TX
I am assuming 27ish. i wont quote you but it still tells me that i was waaaay off and need to slow down.
goodburbon
NAXJA Forum User
- Location
- Westcliffe Colorado.
Should say in the door jamb what tires it came with.
TunaSoda
NAXJA Forum User
- Location
- Douglas, MA
depends on how many PSI's the tires have...
CMAHON
NAXJA Forum User
- Location
- Arlington, TX
i will check the door jam when i get home.
- Location
- Castro Valley,CA
With 35's and 4.56 gear my speedo is off less than 5 mph at 75.
Darky
NAXJA Forum User
- Location
- 29 Palms, CA
My speedometer was dead accurate with 30" tires and now w/33s and stock gears (for now) it is off by about 10%. Both verified by GPS and those radar signs ...Your Speed is: on the side of the road.
- Location
- WA state
I have 30s on mine with 3.73s and my speedo is about 2mph off up to about 45-50. And 5 mph above that.
