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Gear ratio in auto's 

 

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 Post subject: Gear ratio in auto's
Posted: Fri Jul 07, 2006 12:51 am 
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would it be possible at all to change the first gear in the automatic gear box or even retrofit 1st from a commodore box to a falcon box.


if it sounds stupid to you just put it down to that im very tired and think of wacky things :D
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Posted: Fri Jul 07, 2006 12:52 am 
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nope, unfortunately as long as you have a btr you have a s**t first gear.

 

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Posted: Sat Jul 08, 2006 10:19 am 
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3.7 or 3.9 diff gears will see you next to commodores off the line.

 

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Posted: Sat Jul 08, 2006 2:48 pm 
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mrnasty wrote:
3.7 or 3.9 diff gears will see you next to commodores off the line.


And paying a dollar per metre of travel, in fuel bills.

--Striker.

 

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Posted: Sat Jul 08, 2006 3:29 pm 
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Anything is possible, how much you willing to pay. I've already thought about this, and after asking around dismissed it due to cost involved. Get a T5 or a much better diff ratio.

Oh, change the the same 1 and 2nd ratio from a commie, leave 3rd and 4th the same, so you get to keep some form of fuel economy.

 

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Posted: Sat Jul 08, 2006 3:43 pm 
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dont the auto commodores use a different box?

 

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Posted: Sat Jul 08, 2006 3:47 pm 
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Sure do, I really cant see anyone swapping the gears. Even if it was possible, it would be FAR cheaper just to use a commy box with a CRS bellhousing.

 

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 Post subject: crs bellhousing
Posted: Sun Jul 09, 2006 9:52 pm 
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hey whats a crs bellhousing worth, is this conversion really worth it

 

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Posted: Sun Jul 09, 2006 10:02 pm 
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Not sure. I was quoted $1150 for a kit to put a T400 behind a 4.0 so probably somewhere around there.

Worth it? Good question.

For the same price you could put a t5 in.

 

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Posted: Mon Jul 10, 2006 12:50 am 
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mmm i would love a maunal but i love the laziness of the auto :D

sometimes i just cant be bothered changing gears (my other car is a manual)
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Posted: Mon Jul 10, 2006 7:01 pm 
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Quote:
And paying a dollar per metre of travel, in fuel bills


i noticed no difference from 3.08 to 3.73.

 

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Posted: Mon Jul 10, 2006 7:25 pm 
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mrnasty wrote:
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And paying a dollar per metre of travel, in fuel bills


i noticed no difference from 3.08 to 3.73.


:?: :?: :?: :?: :?:
really i thought there'd be heaps. Whats the difference in rpm @ 100km/h now as opposed to what it use to be with the stock diff, cheers :wink:
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Posted: Mon Jul 10, 2006 8:45 pm 
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Following assumes 235/45R17 tyres

3.08 1750rpm @ 100KPH
3.45 1950
3.73 2100
3.93 2200

 

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Posted: Mon Jul 10, 2006 8:50 pm 
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mine sits on 2300rpm with 205/65/15

 

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Posted: Mon Jul 10, 2006 9:27 pm 
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slipping torque converter?

 

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