Topic: I have 33's how do i make my speedo correct now

[madmanweaver444]

yea just wondering how to make my speedo correct after adding larger tires well i didnt add the tires they were on the truck when i bought it so how do you compensate for the different tire size

thanks

[KDXSR5]

You can try to gear it back to factory specs. What year truck? Does it have a VSS?

[madmanweaver444 [OP]]

84 pickup and what is vss im just assuming that i dont have it
how do i regear it

[Rocksurfer]

With 4.88's in the axles you'll be very close to accurate with 33's.

[KDXSR5]

With 4.88's in the axles you'll be very close to accurate with 33's.

Thats how you re-gear it!

[madmanweaver444 [OP]]

o there is no way to change it without regearing the axles i thought you meant like regearing the speedo or something

is anyhting like that possible

[kneedownnate]

I believe downey off-road has the kits to calibrate the speedo gear.

[NorCalBorn]

Depending on which trans you have, if your's is cable driven, you can remove the original gear that's held in with the bolt and plate.

If, like one we just did, it's a 17tooth unit, you can goto the local recycler yard, and start popping speedo output gears, and look for a 18 tooth, or a 19 tooth to replace yours. Play around with the gears, don't force them in, and have a friend motor pace you 'til you find the solution.

Automatics... *This isn't a guarantee though, as some, with auto's, like me, still had to goto a speedo calibration shop for a output unit to overcome the difference due to the fact the gear's usually a AutoSpecific 17tooth.

Kinda like this:



BTW, the math's like this...

(New(Current) Tire Size divided by O/E Tire Size)=%Change

IE: 33/28=1.178...

So if you were doing 60mph, you're now actually going 70. You're off by 9%.

Thus, why mine's a .9123 when using the daily driver 31's and not needed when rolling on 33's.

*Side notes-the reducer actually stops that cable chatter that happens, probaly due to it being filled with gear oil, a cheap harmonic dampener.
**and yes it's a 2wd..but the tech still applies.

[79coyotefrg]

recalibrating the speedo  ONLY  does that,   regearing the diffs  will give you back the power  the truck had  when it had stock tires on

[Tallchevy]

yea just wondering how to make my speedo correct after adding larger tires

Just bend the needle on the gauge 

[OOPS]

recalibrating the speedo  ONLY  does that,   regearing the diffs  will give you back the power  the truck had  when it had stock tires on

And your clutch will luv you and may last a long time.

[madmanweaver444 [OP]]

yea but i dont got money to regear my diffs

[lucky7]

Just go 5 miles slower you should be good