[hooki]

hi AZ,

I'm about to do a w/t conversion in my 85' n/t LWB. I've got some donor w/t diff's which are 3.7 but I've been told the centre's in my n/t housings are 3.9? Which centres would be better to use?

I have the new style rd208 locker to put in the front and have heard of people having a few issues installing these with the 3.9's...something about machining the carrier to fit? Can anyone shed some light on this?

I'll be running 6.5 transfer gears and 33's so just wondering what the difference would be between the two ratio's at highway speeds?


any help/advice would be much appreciated. thanks
Lach.

[want33s]

I haven't encountered any fitting issues.
AFAIK NT and WT diff bits are dimensionally identical.
NT 3.9 is 5% lower than WT 3.7.

33" tyre is 27% larger than stock.
6.5 gears give 20% reduction in high.
NT centres give another 5% so you're still 2% taller geared than stock.

[zukmeista]

And if your transfer case is a NT one the NT diff centres would be better as they have the right flanges.

[neofitou]

I ran 3.9s and 6.5s on 31s, I was sooooo happy. I had spartan lockers f/r. they fit straight in no issues.