Best diff ratio? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

09-17-2002, 03:04

What is the best! gear ratio for a EB2 - 40i gli with 2.5in straight-through exhaust and a pod filter??

-=T W S T D EB=-

Troutman · 09-17-2002, 03:19

Thread has been split. :)

jamesk · 09-17-2002, 04:38

4.11 :)

Troutman · 09-18-2002, 01:07

hehe not sure about that matey...

Ford sixes have a limited rev range, so something like a 3.45 might be optimal. Then again, Thanatos has a 2.92 and his car seems all the better for it due to less gear changing being required. So it comes down to personaly preferences.

I'll be sticking with my faithful 2.77 after the manual conversion for what it's worth.

Brent79 · 09-18-2002, 17:21

Ive got a 2.92 on my wagon and i think its still a bit sluggish. I would prefer the 3.08 i think it is. If you got a 5spd then id say the 2.92 is good coz ud get less wheel spin and it would be better in the wet. For an auto id get the 3.08 or if you want to smoke commies off the line, then the 3.45. If you go any higher then, as Jack said you'd be having to change gear to quickly and would be revving out the donk too much in lower gears...

So what i would have is a 2.92 for a 5spd and either a 3.08 or 3.45 on the 4spd auto. There is also the issue of exhaust noise at cruising speeds which is why id stick to the 2.92 on the 5spd and prolly the 3.08 for the auto.

Brent

Thanatos · 09-18-2002, 19:12

I would agree 100% with jack and brent...

The only way you would realistically get away with a 4.11 on a ford six is if the motor has been HEAVILY worked (increased redline) and the car is used mostly for track work...

Having said this, changing the diff ratio can be a good way to get cheap acceleration. I'm still running a 2.92 mainly because my car has A LOT more torque low down after the engine mods, and going to a shorter diff ratio will probably generate too much wheelspin on take-off (i may upgrade one day, but will probably go for either 3.08 or 3.23 - and my car DOES have a slightly increased redline).

I would recommend NO MORE than a 3.45 for a 4spd auto, 2.92 for a 3spd and 3.23 for a 5spd. These numbers will slightly reduce the car's fuel efficiency during highway driving, but will also slightly increase the acceleration and overall "pull"...

Hope this helps

Dave

lukeyn039 · 09-25-2002, 06:09

This is like desarvew ( proabably spelt wrong.But I can remember replying to this thread but myt post is no where.I have looked through the other posts of simialar content and its not there as well.This is the 4th active topic on diff gears,Funny that. I'l try and find my post or better still retype it.

Cya Lukey.

QLD REP 4 EA-ED club.

FTR40 · 09-25-2002, 10:03

jack.... i actually spoke to mal wood a couple of days ago bout diff & gear box ratio's... he said that anything taller than a 3.20 (or under) would seriously damage the T5's ...

im not exactly sure bout this, but just passing on my aquired info..

cheers

daniel

Troutman · 09-25-2002, 22:09

Quote:

Originally posted by FTR40
jack.... i actually spoke to mal wood a couple of days ago bout diff & gear box ratio's... he said that anything taller than a 3.20 (or under) would seriously damage the T5's ...

im not exactly sure bout this, but just passing on my aquired info..

cheers

daniel

That sounds interesting... especially since manual EAs came standard with diffs no shorter than 2.92. Having a 2.77 manual might be pushing the envelope slightly, but shouldn't do any major damage. I only need the T5 to last a couple of years anyway...

jamesk · 09-26-2002, 07:09

i know someone who had an ea manual with a 2.7 diff still in after the auto-manual conversion and it would cause you to have a ride the clutch a fair bit to get it moving. put in a 3.08 and problem solved. put in a 3.23 and now all i get is complaints about having to change gears too much :/