FJ60 speedo inaccurate

I

IH8RUST

Hard Core 4+
Joined
Jun 13, 2024
Messages
572
I realize the speedo will never be as accurate as it should, but it should be close, right? I have:
  • H55F 5-speed transmission
  • Stock axle gearing
  • 33” tires
I assume that larger tires cover more distance per revolution, which causes the speedo to read slower than I'm actually going. If that assumption is correct, then wouldn't swapping the gear from 6x16 to 6x18 (33403-69065) slow down the rotations to improve speedo accuracy?
 
I

IH8RUST

Hard Core 4+
Joined
Jun 13, 2024
Messages
572
Mud x-post, morning coffee, the other way around, lower teeth count. Makes way more sense, but the issue is that 6x16 is the lowest count as far as I know.
 
Rzeppa

Rzeppa

Rising Sun Member
Joined
Aug 24, 2005
Messages
9,019
Location
Kittredge CO, USA
I had the same setup on my 60, 13% low, both speedo and odo. I never bothered to change out the gears in the back of the t-case, I just guesstimated my speed when looking at the speedo and did the actual math when calculating fuel economy. ¯\_(ツ)_/¯
 
I

IH8RUST

Hard Core 4+
Joined
Jun 13, 2024
Messages
572
+10000, not worth the headache. I'll use a GPS/phone to figure out how much I'm not going. I mean, we're talking about a 2F, after all, and I can finally tell the officer "my speedo doesn't work well" again. /s
 
P

Pz10420

Hard Core 4+
Joined
Jun 21, 2020
Messages
674
Yeah, speeding is usually the least of our problems driving an old 60
 
S

SteveH

Hard Core 4+
Joined
Aug 10, 2006
Messages
3,222
Location
Colo Springs
With 33x9.5s, when my stock speedo reads 60, I'm actually going 69 mph. '78 FJ40, all stock.
 
On the RX

On the RX

Rising Sun Member
Joined
Nov 19, 2016
Messages
2,400
Location
Superior
At first I thought my FJ60 speedo was also inaccurate, but after a minor adjustment, I feel like it is correct. Screenshot_20250714_193242_Google.jpg
 
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