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Who has done the 3.9:1 conversion???? 

 

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 Post subject: Who has done the 3.9:1 conversion????
Posted: Wed Jan 19, 2005 7:03 pm 
Getting Side Ways
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has anyone done a 3.9 diff with an auto, if so what difference did it make at the drags?

mine goes in on fri night, racing on saturday, just wondering what i should expect.

 

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Posted: Wed Jan 19, 2005 7:14 pm 
Getting Side Ways
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mine isnt an auto, but I got 3.9's

I have only run twice since the diff... first time I ran slower, cos I wasnt expecting the the extra gear change - then fudged it.

 

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1993 ED XR8 - Poly Green, AFR 185 Alloy heads, Edlebrock Performer RPM Manifold, Crane 2031, T56 6 Speed, 3.9 diff, = 205.7 rwkw.
1993 ED Fairmont - Cobalt Blue, 5L, 17" CSA's and not much else.
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Posted: Wed Jan 19, 2005 7:15 pm 
Getting Side Ways
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P.S - your cutting it very close with running the diff in... do you plan to get any sleep on friday night? or will you be out cruising all night?

 

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www.XR8Chic.com
1993 ED XR8 - Poly Green, AFR 185 Alloy heads, Edlebrock Performer RPM Manifold, Crane 2031, T56 6 Speed, 3.9 diff, = 205.7 rwkw.
1993 ED Fairmont - Cobalt Blue, 5L, 17" CSA's and not much else.
1969 Mustang Fastback - Gunmetal Grey, 302, Auto, LHD. Doesn't go very hard, but looks sexy as !

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Posted: Wed Jan 19, 2005 9:12 pm 
Getting Side Ways
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i scored a set of second hand gears for $50, i wasnt going to spend money on a new set till i was sure it is the ratio i want to stick with, so i dont have to really worry. it has new bearings and seals but im sure they will be fine.

but im sure fri night will be late as we are going to mini spool ^jase^'s diff too :D , the things we do for fun, lol

 

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Thanks to Crescent Motors, Liverpool.
Call Joe on (02) 9600 6229.

I dont own a Landcruiser, it's a Maverick recovery vehicle!!!!

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Posted: Wed Jan 19, 2005 9:25 pm 
Parts Gopher
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I changed mine to 3.73 diff ratio in my near stock ef and ran a best of 15.6 and slowest of 15.8 with a auto aswell. Only had 1 good launch realy a bit of sumfn to go off
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Posted: Wed Jan 19, 2005 9:34 pm 
Getting Side Ways
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thanx mate, i have run a best of 15.10 so im hoping to break into the 14's now. will let everyone know on sat night.

 

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Thanks to Crescent Motors, Liverpool.
Call Joe on (02) 9600 6229.

I dont own a Landcruiser, it's a Maverick recovery vehicle!!!!

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Posted: Thu Jan 20, 2005 2:43 am 
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XR8Chic wrote:
mine isnt an auto, but I got 3.9's

I have only run twice since the diff... first time I ran slower, cos I wasnt expecting the the extra gear change - then fudged it.


XR8chic, what RPM do you sit on at 100Kph? ..with 3.9's gears? ..
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Posted: Thu Jan 20, 2005 5:20 pm 
Oompa Loompa
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u should get a qualified mechanic to do the job as i dont think ultra-blue will hold it together for u yob..lol..but i spose its dunn good so far

 

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Posted: Thu Jan 20, 2005 5:48 pm 
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It's a yobbomobile.. Everything that has been done has been dodgy anyway. Best bit? She's still good!! 8-)

 

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Posted: Thu Jan 20, 2005 6:10 pm 
Getting Side Ways
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ive said it before and i'll say it again..... ULTRABLUE ROCKS. look at how much its holiding together in my car already, lol.

 

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Thanks to Crescent Motors, Liverpool.
Call Joe on (02) 9600 6229.

I dont own a Landcruiser, it's a Maverick recovery vehicle!!!!

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