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View Full Version : DX Overdrive, whats the deal.


Sly
6th February 2009, 03:13 PM
Has any one here got one ,or know some one who has a Rocky Mountain Dx Overdrive fitted up to their Defender.
Im thinking about a trip next year and a overdrive would help with the long hwy travel between the good bits.
Have looked at the Rockymountain site and know that they can be got through a mob north of Bris. So what are they like ?.
Graz
6th February 2009, 04:45 PM
Watching this thread with interest
PAT303
6th February 2009, 05:23 PM
You could fit 33's or 1.22 disco transfer gears for a similar result. Pat
quaddrive
8th February 2009, 10:07 PM
Last I spoke to them their casting was broken. They were not anticipating the new one for some time:(

I ended up with the GKN and some wiring mods.

Cheers
isuzurover
10th February 2009, 09:30 AM
Last I spoke to them their casting was broken. They were not anticipating the new one for some time:(

I ended up with the GKN and some wiring mods.

Cheers

They broke the mould for the casting. However I believe they have made a new one.
Davo
10th February 2009, 11:26 AM
I've got the Series version on my SIIA. I THINK the internals are the same.

I found that mine hates hot weather and will burn oil. I mean good quality gear oil will turn black and smell awful. This happened only once, but it was when we were driving home up from Perth and in was in the 40s up in the top bit of the Pilbara, on those long, empty stretches of the highway. I was not happy.

I contacted them and they said that the overdrives did generate more heat than they expected, and they sold me one of those finned transfer case cover plates they make, which made no difference. I contacted them later and got a reply to say that they'd driven one during a heatwave in France and it sure got hot and smelly then, too! Ooh, how helpful! It must have been - what - 35 degrees?

Otherwise it has been great to have for the highway, works well, not too noisy, and helps hold 100kmh with the little 2.25 petrol, but I don't recommend them for over 30 degrees. After that they just seem to create more heat than they can dissipate. They would work well down south. Apparently they were tested in Australia - maybe in the dry season?