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  #1  
Unread 28th May 2017, 11:14 PM
skep skep is offline
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Default SF 1.447 into SG or Use SF box with SG 1st

Hey fellers!! I was going to put my l series 1.59 low range into my sg but dont want the hassle so I have decided to look for a 1.447 one instead. A couple of quick questions, If i buy an sf box can I simply swap my stronger SG 1st (and maybe 5th if I if its higher geared??)gear and synchro/slider over to the SF box? that way I will have the 4.11 to give me a little more persuasion up the steeper stuff, as my front (innie) cv's are pretty much cooked anyway.

I am possibly after a front helicle as well, just wondering if it will fit in either of the ratios better than the other?

Id be keen to swap my L series 1.59 for a 1.447 if anyone is interested as well.

thanks boys!

Last edited by skep; 29th May 2017 at 06:03 AM.
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  #2  
Unread 29th May 2017, 12:16 AM
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Red XS Red XS is offline
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I put an sf low range into my sg box as it was a good balance between end result and difficulty for me.

What car is this going in? SG dual range box should already have 4.11 diffs. XT's which are single range have the lower 4.44, I don't know about other models. If you are changing from an SG to an SF box you will need to swap the front CV's to SF (which doesn't sound like an issue in your case). If you are starting with an older Outback gearbox it would be easier putting SF box in as the CV's already match the SF box. If you are changing diff ratios don't forget to do the rear lol.
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  #3  
Unread 29th May 2017, 02:17 AM
skep skep is offline
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Its going in the 03 xs forry mate. AAAh got my wires crossed, I thought it had the 3.9 ratios going on for a second , in that case ill just need the low range gearset and not the entire box! I have a rear diff from my old forry gt that is 4.44, I forget reading if the front ring gear needed to be shaved to fit the 4.44 with the 1.447 or not...

Did you notice much of a difference? I went up a track in low range last year that was running at idle speed for most of the way up here in victoria and found its limits, but bloody hell it was steep. Didnt want to drive down it until my mate told me that thats the track we had come up at the start (Dixsons creek, Vic). So not looking do do anything steeper really, but need it just in case..Cheers
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  #4  
Unread 29th May 2017, 02:44 AM
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Rally Rally is offline
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Good idea to put a front helical in at the same time. Just make sure the axles will fit. The SF low range is a good thing to do if you are towing or have or plan to do other modifications to enhance off road ability.
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  #5  
Unread 29th May 2017, 03:10 AM
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Hey Skep, I'm in Melbourne, used to live in Frankston & love the Mornington Peninsula. Small world!

Yes, I would keep the SG gearbox & fit the SF low range into it. AFAIK no mods needed to fit it with the 4.111 diffs, but with the 4.44 diffs you'll have to machine off the corner of the crown wheel.

With the box open, it's the perfect time to fit a front LSD for a solid offroad setup
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  #6  
Unread 29th May 2017, 03:30 AM
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1.447 is a noticeable improvement over the stock SG low range. There's far less clutch slipping in stop start up hill sections and taking off in soft sand. Climbs which were once borderline stalling can be done with a little more rpm. But it's not low enough for crawling over uphill rocky sections where you need to be driving seriously slowly.

Definitely the right time to fit a front lsd if you want more traction.

I can confirm no mods needed to fit 1.447 low with 4.11 diffs. I never found an answer from anybody who has done 1.447 low and 4.44 diffs, but general consensus is you will need to do some shaving.
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  #7  
Unread 29th May 2017, 03:42 AM
skep skep is offline
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thanks for the quick replies! hmmm might stick with the 4.11's (as I do 120km per day on the freeway)

what do you mean by the axles fitting, rally?

Your 1" lift blocks are holding up well Nacha!!! though havent been offroading in a while! bought an 00 xj but 15 l/per 100 freeway driving has me falling in love with the forry again!!
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  #8  
Unread 29th May 2017, 09:18 AM
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I put the SF 1.447 into my SG. I changed the front and rear diffs to 4.44. I also changed the 5th gear ratio. The front 4.44 crown wheel will have to have a little bit milled off the outside edge.
I originally was only going to do the 1.447 low range until Rick the 'gearbox man' talked me into doing the 4.44 diffs. Having done that I wouldn't do it any other way if I were to do it again.
The fitting off the 4.44 diffs has the effect of lowering the low range to 1.6. In high range the SG is just a better all round car as the torque is used more effectively. So towing is so much better. Also you don't need to change down as much. Off road on climbs quite often I will stay in high range unless I need low range. In low range you no longer need to flog the car and can just climb at a very leisurely pace !!
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  #9  
Unread 29th May 2017, 05:27 PM
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Havachat, on a GPS verified 100kmh, how many revs are you doing in 5th?

Skep, some front axles require a pin to hold them in place and some don't. Some axle set ups the axle itself is female off a small stubby axle, while others are male. The front diff you use needs to be compatible with the axles.
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  #10  
Unread 30th May 2017, 12:22 AM
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Quote:
Originally Posted by Rally View Post
Havachat, on a GPS verified 100kmh, how many revs are you doing in 5th?
I'll do that on the weekend when I change my tyres back to the standard 60 series. The 5th gear that I fitted is a .738.
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