Jaycar Speedo Correction Kits for GU

Post by **JontyG** » Sun Jun 12, 2005 5:33 pm

Hi all,

I am going to have a set of 315's fitted soon. I realise that this will put the speedo out, so I have been looking at options to re-calibrate it.

Probably the cheapest option will be the Jacar Speedo Correction Kit (~$50):
http://www1.jaycar.com.au/productView.a ... &SUBCATID=

Has anyone isntalled this? If so, does it work? How difficult is it to install?
Are there other preffered options?

Thanks,
Jonty

Post by **krimnl** » Sun Jun 12, 2005 6:47 pm

is your GU auto or manual petrol/diesel

i found on my GU when i changed from 3.9:1 gears to 4.3 gears with 315 tyres the speedo was 100% correct.
and it made the car so much more drivable. might be worth just going gears aswell if funds can stretch that far.

Post by **JontyG** » Sun Jun 12, 2005 6:55 pm

Mines a 4.8L auto. It has 3.5:1 standard. Any recommendations what I would need to change to? 4.1's have been suggested.

I gather this is a pretty expensive mod?

Post by **krimnl** » Sun Jun 12, 2005 7:01 pm

depending on what gears you use it might not be that expensive.
i would think 3.9's or 4.1's might fix your speedo.
and give you back some grunt , them ratios are the cheap ones.

some one will have a rear diff around with these gears you can borrow. all you need to do is install the rear center and take it for a drive testing it with a GPS. only takes an hour or so to change the rear to check which ratio suits best.

also being a 4.8 you can use GQ centers.

Post by **JontyG** » Sun Jun 12, 2005 9:38 pm

Thanks krimnl, thats good to know!

Post by **AndrewPatrol** » Mon Jun 13, 2005 10:09 am

Does that hour include setting up the pinion to run right on the ring gear teeth??????

Post by **bru21** » Mon Jun 13, 2005 10:23 am

just swap the hole 3rd member. might as well fit an arb while you are at it too. as with the 3rd out the hard work has been done. setting up the backlash couldn't be easier, especially if you use the hole member as then the pinion only has to be set in one plane. cheers bru

Post by **krimnl** » Mon Jun 13, 2005 8:35 pm

just bolt in the complete center.

sorry to take your thread of topic. i just believe your better of to correct the gearing than stuff round with the speedo.

Post by **bru21** » Mon Jun 13, 2005 9:54 pm

i think the jaycar is the best option if you run multiple sized tyres. i am going to run one of those boxes so i can switch between the 35's and 38.5's, just switch it on or bypass. i think 4.625s are about right for the 35's and 4.3's for 33's. gearing is good but you can't get 4.3's in reality (rare as) and the 4.625's will set you back close to 1k.

cheers bru

Post by **JontyG** » Mon Jun 13, 2005 9:54 pm

Thats cool...I'm just happy to get the feedback, and to hear what other options are available.

Post by **JontyG** » Tue Jun 14, 2005 11:11 am

I was qoted $750 to replace the front and rear ratios, fitment only. That means that I nee dto source them. Can anyone recommend the best place to look for 4.1's in melbourne?

How does that price sound for fitment?

TIA Jonty

Post by **shortie** » Tue Jun 14, 2005 1:34 pm

get a GPS. Accurate speed and can be used in any other vehicle.

Post by **krimnl** » Tue Jun 14, 2005 9:47 pm

JontyG wrote:I was qoted $750 to replace the front and rear ratios, fitment only. That means that I nee dto source them. Can anyone recommend the best place to look for 4.1's in melbourne?

How does that price sound for fitment?

TIA Jonty

i might have some centers around if you give me a call tommorrow i can have a look

Darren

Post by **JontyG** » Wed Jun 15, 2005 8:14 pm

Thought this site was pretty useful for calculating gear ratios, etc:

http://members.optusnet.com.au/~zerosin/gearcalc.html

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Jaycar Speedo Correction Kits for GU

Jaycar Speedo Correction Kits for GU

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