Fordmods Logo

Diff gears 3.45's or 3.7's 

 

Page 1 of 1 [ 5 posts ] 

 
 Post subject: Diff gears 3.45's or 3.7's
Posted: Thu Dec 10, 2009 12:11 am 
Stock as a Rock
Offline
User avatar

Age: 30

Posts: 159

Joined: 13th Dec 2008

Gallery: 1 images

Ride: AU Wagon/ 1967 XR

Location: Melb East
VIC, Australia

Just wondering if there is a big difference between those two diff gears? would there be a big improvement in how hard the car goes if i went from 3.45's to 3.7's? and whats 3.7's like at 100kmph is it starting to rev a bit more?
Top
 Profile  
 
 
 Post subject: Re: Diff gears 3.45's or 3.7's
Posted: Thu Dec 10, 2009 7:01 am 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 2515

Joined: 27th Mar 2006

Gallery: 1 images

Ride: FG MkII Xr6t Ute

Location: Brisbane
QLD, Australia

3.7's are pretty good, I used to run them in my EL. I do a bit of highway work so realistically couldn't go higher than 3.7's with the auto. In saying that I currently have 3.45 in the a*** of my AU and while it is noticably slower it is better for my economy (and currently doing 1000km/week, so need that economy lol).

 

_________________

EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

Top
 Profile  
 
 
 Post subject: Re: Diff gears 3.45's or 3.7's
Posted: Thu Dec 10, 2009 5:01 pm 
Stock as a Rock
Offline
User avatar

Age: 30

Posts: 159

Joined: 13th Dec 2008

Gallery: 1 images

Ride: AU Wagon/ 1967 XR

Location: Melb East
VIC, Australia

cheers mate any idea of how hard it was revving at 100km with 3.7's? this is for a manual as well is there much difference between that and the auto maybe just a few 100rpm or something?
Top
 Profile  
 
 
 Post subject: Re: Diff gears 3.45's or 3.7's
Posted: Thu Dec 10, 2009 6:05 pm 
Smokin em up
Offline
User avatar

Age: 33

Posts: 206

Joined: 26th May 2008

Ride: EF XR6

Location: Brisbane
QLD, Australia

Hi i have 3.7's in my EF. It has been a while since I drove the car but I am pretty sure that it sat around 2400RPM at 100km/h. There was a noticable differance in the accelleration of the car, but in saying that I have now bought a 3.9 diff for it because I think that would be a better track/drag ratio for the manual. I don't think it is working to hard on the highway, couldn't tell you if it is getting good fuel ecconamy because I don't care about fuel ecconamy, and the car was modifyed. I could get close to the 550km out of a tank though, if i stayed on the highway and cruised. Definately helped down the 1/4 though I was running the same times as with the 3.45's with 12BHP less. Hope this helps you out

 

_________________

EF XR6 Manual 271RWHP/199RWKW N/A using Stock manifold with dual plane runners still operating. EFI Hardware 6TBM to come mid year.

Top
 Profile  
 
 
 Post subject: Re: Diff gears 3.45's or 3.7's
Posted: Thu Dec 10, 2009 11:19 pm 
Stock as a Rock
Offline
User avatar

Age: 30

Posts: 159

Joined: 13th Dec 2008

Gallery: 1 images

Ride: AU Wagon/ 1967 XR

Location: Melb East
VIC, Australia

yeah that paints a picture what youve just said, although i dont think i could do 3.9's but for now ill use the 3.45 then look around for a set of 3.7's i think, at least that way can always swap it back if doing a bathurst trip or something :lol:
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 5 posts ] 

Who is online

Users browsing this forum: No registered users and 12 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Tue Dec 19, 2017 9:37 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names