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3.7 or 3.45 diff ratios 

 

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 Post subject: 3.7 or 3.45 diff ratios
Posted: Mon Feb 12, 2007 3:04 pm 
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Simple question, is the 3.7 ratios to high for a daily driver that is gonna be used for alot of highway driving? Or should i just go for a 3.45 lsd? But if i was to go for the 3.7 where would i source 1 from and how much?

 

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Posted: Mon Feb 12, 2007 3:46 pm 
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do a search, has been covered quiet a few times.

 

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Posted: Mon Feb 12, 2007 3:55 pm 
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mrnasty wrote:
do a search, has been covered quiet a few times.

Cmon mate im too lazy for that :) but i did search and will just stick with a 3.45 lsd from a ford.

 

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Posted: Mon Feb 12, 2007 3:55 pm 
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Double post

 

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Posted: Mon Feb 12, 2007 4:22 pm 
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shoot Jaysen a pm he will tell your the various rev ranges in each gear.. he has 3.7's and worked it all out..

Personally I woud go 3.7's though

 

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Posted: Mon Feb 12, 2007 4:31 pm 
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there is a calculator on here that will let you work this stuff out but i dont have time to find it for ya. id go with 3.7 final drive.

 

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Posted: Mon Feb 12, 2007 4:50 pm 
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When i search i found that R31 skyline gears fit but are s**t. So where do i get the 3.7 diff centre?

 

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 Post subject: Re: 3.7 or 3.45 diff ratios
Posted: Mon Feb 12, 2007 9:14 pm 
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daggy082 wrote:
Simple question, is the 3.7 ratios to high for a daily driver that is gonna be used for alot of highway driving? Or should i just go for a 3.45 lsd? But if i was to go for the 3.7 where would i source 1 from and how much?


Here's a photo of how to work out speed verses ratio stuff.

 

 

Attachments:
Speed calculator with example.jpg
Speed calculator with example.jpg [ 353.25 KiB | Viewed 73 times ]

 

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Posted: Mon Feb 12, 2007 10:51 pm 
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3:7's are always good for a quick launch just remember when you are doing 100k's your revs will be onabout 2500. Thats with a T5 manual anyway.

 

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Posted: Tue Feb 13, 2007 11:49 am 
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Has the auto Shiftpoint/Incorrect speedo problem been solved yet? I'm going from 3.08 to 3.7 soon...

 

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 Post subject: bugger 3.7's go 4.11's
Posted: Tue Feb 20, 2007 12:28 pm 
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nothing launches your car harder then 4.11's u wont no know what hit you and if u have a 4spd ull do 2250revs at 100, 2500 at 110....not to bad doesnt bother me.

 

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 Post subject: Re: bugger 3.7's go 4.11's
Posted: Wed Feb 21, 2007 2:43 am 
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ebfairmont3.9 wrote:
nothing launches your car harder then 4.11's u wont no know what hit you and if u have a 4spd ull do 2250revs at 100, 2500 at 110....not to bad doesnt bother me.


are you sure your speedo is calibrated correctly. 3.45's will be around 2150 with a t5. (ef xr6)

i have 3.9's and auto and i reckn mine's up around 2400 @ 100.

4.11's would def be more than 2250 @ 100kph.

 

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Posted: Wed Feb 21, 2007 4:54 am 
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To solve the speedo issue, send the boys at shiftkits.com.au a request, they will supply a box that does the job with instructions on how to wire it in. They helped fix mine.
I solved my prob of the 3.9 gears with and XD transducer from mal wood witch got the speedo accurate, and the box got the shift points right.
Brett

 

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 Post subject: Re: bugger 3.7's go 4.11's
Posted: Wed Feb 21, 2007 7:54 am 
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[quote="prydey"][quote="ebfairmont3.9"]nothing launches your car harder then 4.11's u wont no know what hit you and if u have a 4spd ull do 2250revs at 100, 2500 at 110....not to bad doesnt bother me.[/quote]

are you sure your speedo is calibrated correctly. 3.45's will be around 2150 with a t5. (ef xr6)

i have 3.9's and auto and i reckn mine's up around 2400 @ 100.

4.11's would def be more than 2250 @ 100kph.[/quote]

He pretty close to the mark. Mine same.

As for skyline gears being crap. You set them up properly with the right shims you wont have a problem, if you dont then they will be noisy.

Biggest problem with skyline gears IMO is they are used on a 75 series centre where as falcon are 78 series. Difference is about 70thou.
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Posted: Wed Mar 21, 2007 1:28 am 
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whats the go with the speedo and gear changing point thing as im looking at going 3.9 soon do i have to change somthing or is it that the speedo will just be out?

 

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