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DIY: Auto To Manual Swap
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Old 04-26-2011, 06:48 PM   #161
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The only thing you have to do to make the car start is to connect the 2 wires on the automatic selector that tells the ecu its in either Park or Neutral.
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Old 04-27-2011, 01:44 AM   #162
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Default 4.44-3.9 swap

Don't you need to swap both the front and rear differential becauses of the Final Drive Size Difference? Looking into going with a Legacy Tranny for my 98rs but the final drive ratios are way different.(4.11-3.9)

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Originally Posted by Letze View Post
1. You cant use the AT Drive Shaft (because its 3 inches shorter than the MT5) But, you CAN use the CV Axels I used all of my 98 Auto CV axels and everything worked out fine

2. You can run full time with the Auto ECU there have been discussions on how to modifty it to get the ABS to work but its a slight hack job and I dont feel its a safe/reliable soltuion as it could become hazardous.

3. The MT5 ECU is needed only if you want to switch to an MT5 ABS pump and have proper ABS (although this hasnt been 100% confirmed as I've never seen any one do this) Reverse lights are simply wired in from the MT5 transmision wires no ECU requirement.

As long as you have all of the mechanical parts you can almost do a plug and play on your car, you have to bridge a few pieces of the Auto Harness to trick it into neutral and enable the fuel pump. You also need to bypass tha Automatic ignition switch. a simple way is just running straight from the ignition to the starter, you can also use spade connectors to clip in at the clutch switch (I recomend it if you're used to driving autos)

Unless you Swap a complete Manual Wiring harness you cannot have cruise control wile using an MT5 Transmission.
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Old 04-27-2011, 05:07 AM   #163
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Quote:
Originally Posted by lanrith View Post
Don't you need to swap both the front and rear differential becauses of the Final Drive Size Difference? Looking into going with a Legacy Tranny for my 98rs but the final drive ratios are way different.(4.11-3.9)
Yes.

This whole thread is full of misinformation.

You do not need to swap the ECU. There is no such thing as a M/T or Auto ECU. They are identical, you just have to ground the correct wire to tell the ECU that it's connected to a M/T Trans.
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Old 04-27-2011, 07:02 AM   #164
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The problem is there are so many ways to go about the swap, depending on your needs. True, the ECU is exactly the same but the harness tells it which transmission is installed. It's not that it cares a whole lot, just raises the idle for 4eat, so it can be "tricked" easily. I reccomend a full harness swap and 5mt abs pump but they aren't necessary for everybody
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Old 04-27-2011, 08:14 AM   #165
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I have a question relating to starters. My car is a '94 1.8 FWD, and I'm planning on using a 5-spd from a '91 Legacy FWD. I know the starter is different from automatic to manual and Legacy to Impreza. Therefore, since I'm using a Legacy trans and an Impreza engine, which starter do I get? Is it engine or trans specific? Thanks,

-Chris
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Old 04-27-2011, 10:30 AM   #166
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Get the starter that matches the trans, and get the flywheel from the same
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Old 04-27-2011, 05:56 PM   #167
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With help from iluvdrt on nabisco, this is how I wired my swap. Post #9 is where the technical info starts. Remember, all the 4EAT tranny wiring is the SAME for all EJ cars, legacy, impreza, forester, yada, yada.

This helped me a lot.


~Josh~
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Old 05-24-2011, 01:26 AM   #168
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Your amazing, one question though, just because I just bought my first subie, and I wished it were stick, does this apply to a 99 OBS Impreza as well? Arent GC8's the same as GF8's but the GC is a coupe and the GF is a wagon?

If so, what should I look for to buy for the 99 obs AT? a 2002 wrx MT would work with all the parts as well?
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Old 05-24-2011, 10:47 AM   #169
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the number after the letters has to do with the version of the car. (correct me if im wrong)
like gc8 is the turbo edm/jdm impreza, gf8 same deal but wagon. What you have is a GF4, a 2.2L n/a wagon etc. doesn't really matter here

you can use a 2002 wrx MT, its going to cost you more but as long as you match up all the right parts (like axles/rear diff etc) it will work just fine.
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Old 05-25-2011, 07:51 AM   #170
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Quote:
Originally Posted by salvator_rizzo View Post
the number after the letters has to do with the version of the car. (correct me if im wrong)
like gc8 is the turbo edm/jdm impreza, gf8 same deal but wagon. What you have is a GF4, a 2.2L n/a wagon etc. doesn't really matter here

you can use a 2002 wrx MT, its going to cost you more but as long as you match up all the right parts (like axles/rear diff etc) it will work just fine.
Thanks rizzo! been thinkin hard about that one! your the man!
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