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18-08-2010, 11:54 PM
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FF.Com.Au Hardcore
 Join Date: Jul 2005
Location: Melbourne
Posts: 2,146
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I'm interested in changing the diff ratio in my ute, got a couple quick questions...
1) What are people paying for this both parts and installed? 2) Does it effect the speedo a great deal, if so, how was it fixed? 3) Effect on fuel economy (I didnt buy a v8 to be good on fuel, but the effects would be good to know) 4)Would 3.9s be the go behind a T5, or something else recommended? Cheers |
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19-08-2010, 12:53 PM
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not here much anymore
Join Date: Dec 2004
Location: Sthn NSW
Posts: 22,918
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Yo
got a mate who's put them into his and it's a stick too so I will ask him and get some answers. I think the overall reaction was positive.
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RAM 1500
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19-08-2010, 01:01 PM
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Just another mock-up..
Join Date: Sep 2006
Location: In an AU Fairlane somewhere...
Posts: 9,966
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A mate of mine put them in..
Answers to your q's.. 1. About $800 I think he paid, included tightening LSD. (live axle) 2. Speedo was out.. Can get a speedo corrector from Jaycar, or try and figure out how many teeth you need on the gear on the transducer.. 3. Unsure.. Would mean you're revving a little higher on highways.. 4. My mate was pleased with 3.9's, but, has said if he had to do it again he'd go 3.7's.. seems to think 3.9's are more for an auto.. Only need 3.7's with a T5.. Hope that helps mate!
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Desire isn't driven by the heart, the mind or the wallet. Desire comes from another place. It's created by the smell of burnt fuel under full throttle and the look a car gives you when you're washing it alone at night... see my car here: Built my own TL50!!! [SIGPIC][/SIGPIC]
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19-08-2010, 01:48 PM
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Just slidin'
Join Date: Sep 2005
Location: Brisvegas
Posts: 7,791
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1. To put just diff gears in, and nothing else, should be around the $300-$500 mark.
2. Speedo will be out, get someone you know to sit beside you at 100kmh. Write down what your speedo says, for eg: Mine says 130km. So its out 30%. So at 60, mine will read 78, 70 it will read 91, 80 - 104, etc etc. 3. I use more fuel with my 3.08's then 3.9's, mostly highway driving. 4. Best mod I have ever done, although its in an auto. Have been in a manual with 3.9's, does rev a little higher, first gear isnt much use, but overall it was really good.
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MD Mondeo - For the family
NP Pajero - For the adventure |
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19-08-2010, 09:22 PM
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Regular Member
Join Date: Jan 2005
Location: Canberra
Posts: 364
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Quote:
1. Cost $1480, which was new gears bearings and LSD. Everything. 2. I have to sit on about 130kph to do 110 actual speed. Verified by a GPS. No fixes that I could be bothered with. Just do the math and add 15%. 3. No difference to fuel consumption that I've noticed. 4. Would I do it again? No. With an auto? possibly. Manual, I would put my money towards something else.
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FPV GS Ute #370/Brembo brakes |
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21-08-2010, 08:05 PM
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Regular Member
Join Date: Jan 2005
Location: Canberra
Posts: 364
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I should also add that overtaking performance has improved dramatically. But don't do it if you're under the impression it's going to totally transform the performance and turn it into jet.
I think you would be far better off putting your money towards some AFR's or similar. Most noticeable modification I did was install the manifold spacer.
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FPV GS Ute #370/Brembo brakes Last edited by DW260; 21-08-2010 at 08:07 PM. Reason: tipsy |
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3.9 diff gears for XR8 ute.
Linear Mode
