Reduction gears for the mighty 2.8

[patrol2.8]

Just got permission from the finace department for the go a head for a set of reduction gears for the mighty 2.8 now what size reduction should i go for biggest part of my 4wding is a day out in the bush (Wombats / Tallarook etc)

[nissannewby]

Can you give us a little more info like tyre size. Generally the 85% are the pick but these help a great deal when running 35"+ tyres and a petrol engine or auto.

[patrol2.8]

Nissannewby Im running 33s 5 speed box (2.8s dont have an auto option ?) diffs are 4.6s

[nissannewby]

If you dont intend running any larger tyres or going to extreme then I think marks adaptors do some around the 60% mark

[Bigrig]

With 4.6 ratios and a manual, I'd be going the 43% gears that Marks do ... that'll still be crawling - any lower and you'll find first gear becomes obsolete (even down hill) as its simply to slow ... my 85% gears in an auto box petrol engine have near rendered first gear obsolete.

[macca]

Got a set of 43% gears in the shed to go into my 4.2TDI manual, guys in our club with the 80% gears dont like them as they can not get enough momentum in some cases like sand.

The gearing affects all the low range gears and they can not pick one that suits the terrain which drives them nuts.

To watch them very slowly idle up a steep rocky track is quite a sight to see though.

1st low is fantastic for crawling over a very difficult rock climb but nothing else they reckon, its just so low.

They are talking of swapping them for 43% gears, hence why I got a set of them.

[patrol2.8]

Thanks Guys will look into the 43%

[P4trol]

Silly question:

85% means 85% slower than the speed you would be travelling in standard low range?

How much effort is it to fit reduction gears?

[nissannewby]

Yep 85% reduction. Not to much mate can be done in a day quite easily.

[macca]

Attached are ratios in my ute, and with the various reduction gears, gives you a bit of an idea to help make your mind up.