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| twindongs |
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Hey guys,
I know there are alot of threads out there about diff gears but i cant seem to find the information im after! Ive been thinking about changing my diff gears from 3.45 to 3.7 or 3.9's. Which is the best way to go? 3.7's or 3.9's? Is there much of a noticable difference between the 3.45 and 3.7, like it is really worth it? I guess if i had a 3.08 and upgrading you would go the 3.7 or 3.9 since your doin it anyway but is it worth the swap from what i have? Ive got a 5 speed manual el xr6 cheers! Rat
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
I wouldnt go 3.9's behind a manual unless you like changing gears for fun
As it is with my 3.73's first gear is pretty short, although im running an EA box. Thing is, your running 14.3 down the track which is very good for the mods so i wouldnt change a thing. Going to 3.73's might not do anything, might even go slower on the track but it defintely would feel nicer to drive and more responsive |
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| Krytox |
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Me either,
I went back from 3.45:1 to 3.23:1 In an auto yes, but a manual... meh.. no point.. unless your engine can do 6000+ rpm!
_________________ Carefree, we may not be number one, but we're up there. |
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| xr6eat 50 |
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FordFairmont wrote: I wouldnt go 3.9's behind a manual unless you like changing gears for fun
As it is with my 3.73's first gear is pretty short, although im running an EA box. Thing is, your running 14.3 down the track which is very good for the mods so i wouldnt change a thing. Going to 3.73's might not do anything, might even go slower on the track but it defintely would feel nicer to drive and more responsive I agree totaly with this i have 3.73's in my manual ef xr6 and i wish i got 3.90's. the 3.73's did not make a big enough difference I was just worried the 3.90's would be too bigger jump but i reccon they would have been good in hine site.
_________________ EF XR6 Manual 271RWHP/199RWKW N/A using Stock manifold with dual plane runners still operating. EFI Hardware 6TBM to come mid year. |
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
xr6eat 50 wrote: FordFairmont wrote: I wouldnt go 3.9's behind a manual unless you like changing gears for fun As it is with my 3.73's first gear is pretty short, although im running an EA box. Thing is, your running 14.3 down the track which is very good for the mods so i wouldnt change a thing. Going to 3.73's might not do anything, might even go slower on the track but it defintely would feel nicer to drive and more responsive I agree totaly with this i have 3.73's in my manual ef xr6 and i wish i got 3.90's. the 3.73's did not make a big enough difference I was just worried the 3.90's would be too bigger jump but i reccon they would have been good in hine site. i was actually advising against 3.9's 
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| needfordspeed |
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I've had 3.9's in a manual EF, definitely recommend them for a NA setup and i'd get them again if I was going NA.
_________________ 1988 EA S-Pack|MPI|LSD|AIT turbo manifold|Garrett GT3540|3" Exhaust turbo back|Resprayed|microtech LT8s|60lb Injectors|Bosch 044 with surge tank|3000 RPM stall|Ported AU head|Wade turbo cam|Crow double valve springs|1.3mm MLS headgasket|C4 conversion|Built bottom end|10.6@125MPHi |
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| phongus |
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Just depends what you use the car more...getting from A - B? or getting from A - B faster in different situations...or just to get the car faster off the line at the track.
Getting from A - B in normal traffic...stick with what you got. Getting from A - B quicker in metro area majority of the time...get 3.7s. more freeway, stick with 3.45...and 50/50 3.45s Faster off the line...3.9s personally...3.23s is what I'm sticking with cause I use it for commuting more then track days. phong =P~
_________________ phongus = Post whore 2006 |
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| needfordspeed |
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And BTW it seems our cars ran fairly similar times at the track, with 3.9's it crossed the line in 4th at fairly high revs (can't remember what exactly) you'll probably get better 60' times too with the 3.9's my best was 1.9
_________________ 1988 EA S-Pack|MPI|LSD|AIT turbo manifold|Garrett GT3540|3" Exhaust turbo back|Resprayed|microtech LT8s|60lb Injectors|Bosch 044 with surge tank|3000 RPM stall|Ported AU head|Wade turbo cam|Crow double valve springs|1.3mm MLS headgasket|C4 conversion|Built bottom end|10.6@125MPHi |
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| twindongs |
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woah thanks for all the info guys!
i only really drive the car on weekends, everynow and then it will be used for a down south trip but im willing to sacrafice a few rpm if its going to chop a bit of 1/4 mile time off and people keep saying its much more fun to drive with the 3.7's/3.9's. definately a gain to be had with the 60 ft times by the sounds of things my best 60ft was a 2.2 i think! i have been thinkin about what you said xr6eat 50 about there not being much difference between the 3.45 and 3.7 so i might go with some 3.9's and see how i go! going to install them myself so if worse comes to worse and i dont like the new ratio ill put the 3.45's back in a guess its all about trial and error! cheers for all the help! dame
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| twindongs |
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one diff place has told me that 3.9's wont go in an el diff!
does anyone know if this is true??
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| dlv8ltd |
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twindongs wrote: one diff place has told me that 3.9's wont go in an el diff!
does anyone know if this is true?? lies lies i till you they do go don't believe them go to another place
_________________ SWAP MY DL LTD V8 Sunroof Leather Sports Exhaust Gas Tint |
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| FordFairmont |
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Posts: 6113 Joined: 8th May 2007 |
twindongs wrote: i have been thinkin about what you said xr6eat 50 about there not being much difference between the 3.45 and 3.7 so i might go with some 3.9's and see how i go!
so you want to fit 3.9's because its more of a change than 3.7's? running a 2.0 or less 60" footer can be done with 3.45's, people like "smoke" for example done it in his EF with just upgraded exhaust and 3.45 lsd. |
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| twindongs |
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FordFairmont wrote: twindongs wrote: i have been thinkin about what you said xr6eat 50 about there not being much difference between the 3.45 and 3.7 so i might go with some 3.9's and see how i go! so you want to fit 3.9's because its more of a change than 3.7's? running a 2.0 or less 60" footer can be done with 3.45's, people like "smoke" for example done it in his EF with just upgraded exhaust and 3.45 lsd. i want to experiment with a more extreme difference in ratio not just a slight change. i have seen in a few threads people saying they have gone from 3.45 to 3.7 and wished they went 3.9. i know a sub 2 sec 60 foot is achievable with a 3.45 but it just might make it more achievable for me with different diff gears! i guess you could say im still undecided, most quotes of 1200 bux has put me off a bit so i am trying to work soming out with a mate of mine.
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| twindongs |
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hey guys,
Iv bought some diff gears from ebay. They are 3.89:1 ratio and advertised to fit borgwarners ea-au. just noticing most people put 3.91's in instead of 3.89's. is there any reason for this?? My gears will fit in okay yeh? cheers
_________________ El xr6 |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
twindongs wrote: hey guys,
Iv bought some diff gears from ebay. They are 3.89:1 ratio and advertised to fit borgwarners ea-au. just noticing most people put 3.91's in instead of 3.89's. is there any reason for this?? My gears will fit in okay yeh? cheers there is no set of diff gears that will all diffs EA to AU. there was a change over part way through the EF model run. |
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