Who wants a 4x4 rear diff housing in Sydney?

**Lotz-A-Landies** · 31st October 2015, 10:37 PM

I haven't taken it out in daylight, but there was still oil in the housing, no broken stub and no obvious surface rust. Not as clean as the overhauled one though. One on the rt is the rebuild, one on the left is the broken housing.

Re the space. You haven't seen the size of the Chook Shed!

**TK_Co** · 1st November 2015, 06:30 AM

Thanks so much Diana !!
I hope you arm is feeling better !!!

**BadCo.** · 1st November 2015, 06:35 AM

Originally Posted by Bearman

The 3.5 and 4.7 carriers have different offsets.

Does this mean when you up tire size and want to change ratios you have to swap the whole diff out? Or are aftermarket rings designed to fit the 3.54 hemisphere?

**TK_Co** · 1st November 2015, 07:03 AM

Originally Posted by BadCo.

Does this mean when you up tire size and want to change ratios you have to swap the whole diff out? Or are aftermarket rings designed to fit the 3.54 hemisphere?

It depends what ratio you want to go to. And you might find it better to change the transfer case gears.

**BadCo.** · 1st November 2015, 07:08 AM

Originally Posted by TK_Co

It depends what ratio you want to go to. And you might find it better to change the transfer case gears.

I think the next step up from 3.54 for 35"+ tires is 4.11? I may be wrong though...

**Bearman** · 1st November 2015, 07:22 AM

Originally Posted by BadCo.

Does this mean when you up tire size and want to change ratios you have to swap the whole diff out? Or are aftermarket rings designed to fit the 3.54 hemisphere?

I believe 3.9 and 4.1 will fit on a 3.5 salisbury carrier, but on the 4.7 carrier only that ratio will fit unless you get the crownwheel machined ( 3/16" in the case of 3.5) to accommodate the larger pinion head. So ideally 3.5 carriers are what you want if you are going to experiment with ratio changes, and that should already be in yours.

**BadCo.** · 1st November 2015, 07:23 AM

Originally Posted by Bearman

I believe 3.9 and 4.1 will fit on a 3.5 salisbury carrier, but on the 4.7 carrier only that ratio will fit unless you get the crownwheel machined ( 3/16" in the case of 3.5) to accommodate the larger pinion head. So ideally 3.5 carriers are what you want if you are going to experiment with ratio changes, and that should already be in yours.

Good to know, thanks Bearman.

**Bearman** · 1st November 2015, 07:33 AM

Originally Posted by TK_Co

It depends what ratio you want to go to. And you might find it better to change the transfer case gears.

Yes, this is probably the cheaper way to go, in the perentie stock parts there are 2 ratios for the LT95a, 0.996 is the common one for most 4x4's and the 6x6 and 1.113 for the RFSV. The 2 hi range gears you need to change are probably going to set you back about 500-600 which is a lot cheaper than new cw&p's and the time needed in labour cost to set them up. But realistically if you have a decent lathe or know a good machinist there are a number of ratios you can put in simply by machining the high range gear of choice to accept the tapered roller bearings. 1.174 and 1.336, are others that come to mind.

Thread: Who wants a 4x4 rear diff housing in Sydney?

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