CRD/V8 diff upgrade.

[Clarky]

My TCM left PITTSBURGH, PA - USA on the 7th.
then CINCINNATI, OH - USA on the 8th.
Customs SYDNEY - AUSTRALIA on the 8th (5pm)
DHL Sort Facility SYDNEY - AUSTRALIA on the 11th & that is where it has sat for the last week.

I know Lithgow is "remote" (and the intersection of both major HWY's across the Blue Mountains) but?

At this rate DHL could give Aus-post a good name!

[rustynuts]

Originally Posted by Clarky

My TCM left PITTSBURGH, PA - USA on the 7th.
then CINCINNATI, OH - USA on the 8th.
Customs SYDNEY - AUSTRALIA on the 8th (5pm)
DHL Sort Facility SYDNEY - AUSTRALIA on the 11th & that is where it has sat for the last week.

I know Lithgow is "remote" (and the intersection of both major HWY's across the Blue Mountains) but?

At this rate DHL could give Aus-post a good name!

I often get the same with Aus post with stuff from Rock Auto. Sits longer in Sydney than it does to travel half way across the world.

[wilsonjeep]

HAHA, I've seen a lot of my stuff sit in Hawaii for a week before hitting Brisbane?WTF

[Clarky]

Fitted the re-calibrated TCM today, what a real Pr!# to get to. It was up under the drivers side dash to the left behind the aircon ducts just below the radio.

Cleared the fault codes (20 of them) reconnected the abs sensor & went for a drive.
The Good
No more limp mode! Cruse control works again & speedo is spot on.

The undecided
Being this TCM was programed & set up in a 1000HP SRT8 there is a few things I will have to get used to. If I hold the accelerator flat it won't change up gears - hits red line & no up shift. If I'm gentle on the throttle it up shifts at about 3000rpm. I am hoping the adaptive learning nature of the TCM/Nag1 will settle in to my driving style.

I can now select gear ratios all the way up to 5th manually! I have to remember to down shift now if in manual mode. First time I have ever seen 5th illuminated on the dash.

The bad
The only negative will be if I have to send it back to get the shift % changed.

All up its nice to have no dash lights.

So if your thinking about doing a ratio change in a CRD WH/XH you won't get much change from $4k.
Is it worth it? Well I don't know yet, I will need to do some towing to find out.

Would I do it again?
Yes! I'm a sucker for punishment. I love working on my beast, it's therapeutic.

I would like to thank
Valpacer for all the advice. This guy has a world of knowledge about the WH & has been nothing but helpful. Thank's Dave

Mike at OST in the USA. He was willing to have a go when so many here in Oz weren't . He tested the TCM in his own Grand before he was happy to send it to me. In the end he saved me at least $500au over the only other available option I could find. When the funds permit I may send my original TCM to him for ratio & tyre size reprograming only.

To everyone who gave me links & phone numbers of people to try thankyou, the Jeep community is genuinely one of a kind

[Clarky]

Yes!

Done! Completed! It WORKS!!!

After many months of emails & wondering if I did the right thing trying to change my ratios I have SUCCESS!

If you want to attempt the 3.55 to 3.73 ratio change this is what you need.

1 pair of diffs from a V8 Grand (3.73 ratio's)
1 TCM from a US version CRD Grand (they are factory fitted with 3.73 ratio's)

That's it. NO reprogramming of anything. Swap all the bits out & away you go.

[briteway]

You legend!!!

[08crd]

Well done Clarky, you're a legend.