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6MT Master Swap Thread


HAMMER DOWN

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I only have the "as shipped" photos Frank sent me (previously posted in this thread, I think)... and they're not great:

 

http://img.tapatalk.com/d/13/08/27/4enuve5y.jpg

 

http://img.tapatalk.com/d/13/08/27/azera4ez.jpg

 

I should have taken some at the shop yesterday.

Tits mcgee
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So, new gear ratios, as I understand them, will be:

 

OLD:___________New:_______

_______________1st - 3.636

1st - 3.166_______________

_______________2nd - 2.235

2nd - 1.882_______________

_______________3rd - 1.521

3rd - 1.296_______________

_______________4th - 1.137

4th - 0.972_______________

_______________5th - 0.971

5th - 0.780_______________

_______________6th - 0.756

 

I used this fancy table I found on a Jeep site, and calculated the following:

 

Combined ratios (old 4.11 FD, new 3.90 FD):

OLD:___________New:_______

_______________1st - 14.18

1st - 13.01_______________

_______________2nd - 8.72

2nd - 7.74_______________

_______________3rd - 5.93

3rd - 5.33_______________

_______________4th - 4.43

4th - 3.99_______________

_______________5th - 3.79

5th - 3.21_______________

_______________6th - 2.95

 

Calculated speed in MPH at 3,000 RPM with 225/40/18 tires:

OLD:___________New:_______

_______________1st - 16

1st - 17_______________

_______________2nd - 26

2nd - 29_______________

_______________3rd - 38

3rd - 42_______________

_______________4th - 51

4th - 56_______________

_______________5th - 59

5th - 70_______________

_______________6th - 76

 

Does that all sound about right?

Edited by DeltaNu1142
Tits mcgee
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^ re-gear 5 & 6 to Spec B ratios :)

That would be nice, but any 6MT would be an improvement. If what I posted is correct, even the 08+ STi transmission provides a wider range from 1-6 than the Legacy manual does from 1-5. That's not the case with the earlier STi 6MT's, IIRC.

Tits mcgee
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So, new gear ratios, as I understand them, will be:

 

OLD:___________New:_______

_______________1st - 3.636

1st - 3.166_______________

_______________2nd - 2.235

2nd - 1.882_______________

_______________3rd - 1.521

3rd - 1.296_______________

_______________4th - 1.137

4th - 0.972_______________

_______________5th - 0.971

5th - 0.780_______________

_______________6th - 0.756

 

I used this fancy table I found on a Jeep site, and calculated the following:

 

Combined ratios (old 4.11 FD, new 3.90 FD):

OLD:___________New:_______

_______________1st - 14.18

1st - 13.01_______________

_______________2nd - 8.72

2nd - 7.74_______________

_______________3rd - 5.93

3rd - 5.33_______________

_______________4th - 4.43

4th - 3.99_______________

_______________5th - 3.79

5th - 3.21_______________

_______________6th - 2.95

 

Calculated speed in MPH at 3,000 RPM with 225/40/18 tires:

OLD:___________New:_______

_______________1st - 16

1st - 17_______________

_______________2nd - 26

2nd - 29_______________

_______________3rd - 38

3rd - 42_______________

_______________4th - 51

4th - 56_______________

_______________5th - 59

5th - 70_______________

_______________6th - 76

 

Does that all sound about right?

 

2.71 total ratio in a 5 eat in 5th :p

Now that's thinking out of the boxer!:lol:

fyi all 05 + legacy's have built in code reader

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So, new gear ratios, as I understand them, will be:

 

OLD:___________New:_______

_______________1st - 3.636

1st - 3.166_______________

_______________2nd - 2.235

2nd - 1.882_______________

_______________3rd - 1.521

3rd - 1.296_______________

_______________4th - 1.137

4th - 0.972_______________

_______________5th - 0.971

5th - 0.780_______________

_______________6th - 0.756

 

I used this fancy table I found on a Jeep site, and calculated the following:

 

Combined ratios (old 4.11 FD, new 3.90 FD):

OLD:___________New:_______

_______________1st - 14.18

1st - 13.01_______________

_______________2nd - 8.72

2nd - 7.74_______________

_______________3rd - 5.93

3rd - 5.33_______________

_______________4th - 4.43

4th - 3.99_______________

_______________5th - 3.79

5th - 3.21_______________

_______________6th - 2.95

 

Calculated speed in MPH at 3,000 RPM with 225/40/18 tires:

OLD:___________New:_______

_______________1st - 16

1st - 17_______________

_______________2nd - 26

2nd - 29_______________

_______________3rd - 38

3rd - 42_______________

_______________4th - 51

4th - 56_______________

_______________5th - 59

5th - 70_______________

_______________6th - 76

 

Does that all sound about right?

 

Yes - just means you'll be shifting more and more often with the 6MT - down-side IMHO, but worth it overall. And you'll see a slight bit of improvement in mileage in 5th and 6th versus what you'd see in the 5MT in 5th only.

 

^ re-gear 5 & 6 to Spec B ratios :)

 

This is exactly what I hope to do, when the time comes. Hope to rebuild it actually to my own specs and distribute more of the LGT 1-2 meat across the 1st-2nd STI trans, keep STI 3rd-4th and add the Spec B 5th-6th

- Pro amore Dei et patriam et populum -
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  • 2 weeks later...

heres my list of parts/part numbers and pricing from my complete 6 speed swap for anyone looking to do the swap. i did not shortcut or cheap out on any parts. alot of parts were new or very very low miles

 

 

06 sti transmission w/shift linkage $2,500

 

06sti rear diff $425

 

rear spec b axles $750 dealership 28421AG03B

 

rear diff axle seals $20 both 806732200

 

driveshaft 6 speed/r180 (spec b/05-09 4eat) $600 1(866)4556622 Jeff Driveshaft Specialist (i went with custom built, not auto driveshaft)

 

spec b shifter rod $31 35041AG020

 

spec b shifter stay $51 35031AG020

 

Downpipe support bracket $24 44021fe030

 

6mt clutch hose $27 goodridge

 

6mt slave cylinder $50

 

Reverse lockout cable $75 35060ag010

 

clutch kit(act hd-ss sti) $650 circuitmotorsports

 

sti flywheel $100

 

cobb sts/knob/bushings $190 (used 6 speed)

 

torque solutions(engine/trans/pitch mount) $485 mtrperformance.com (only need trans mount but i replaced all of them)

 

clutch fork spring $8

 

whiteline rear diff bushing $130 rallysportdirect.com kdt901/903/905 (extras i added to tighten up the drivetrain

 

spec b rear aluminum diff mount $133 41310ag040

 

05 STi 6MT front half shaft seals $20 both L/H 806735240

R/H 806735230

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heres my list of parts/part numbers and pricing from my complete 6 speed swap for anyone looking to do the swap. i did not shortcut or cheap out on any parts. alot of parts were new or very very low miles

 

 

Why did you go with a special driveshaft? Is it aluminum? 1-piece?

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I did not want to buy a used automatic driveshaft. I wanted to replace as many parts as possible with brand new parts. Also to run a auto driveshaft you have to swap the diff flange and the custom driveshaft I had built is a lot beefier than the auto driveshaft. I'm doing a built where I plan to make 550-600whp on e85 so I'd rather no risk having a part fail on a used driveshaft(u joints Ect) I did a custom 2 piece.
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Not saying it can't handle it, I'm saying with higher mileage, and higher hp it puts strain on the joints. Will an auto driveshaft work. Yes. Would I rather do preventative maintence and spend the extra 400$ and do it once. And never have to worry about it again. I plan to track my car, so it's gonna be put under load alot more than a daily where you might do a few pulls here and there. Edited by thisisthenewsic
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Picked up my car tonight & drove it home.

 

First impressions... WOW. Incredible. Snappy shifts on the stock STi shifter. And QUIET. I knew my tranny was making noises, but I had no idea how loud it was before it was gone.

 

The tech used the 5MT harness and sensors. Cruise control works. Reverse lights work. My cobbled reverse cam doesn't work in reverse, although my "reverse cam button" works fine. My USB charger for my iPhone doesn't work... but since those are both my doing, I'm sure they just screwed it up in the swap. I can't blame them for that.

 

Issues: my used 4EAT driveshaft has a loose bit of metal inside. It sounds like jingle bells at speeds under 10mph with the windows down. I checked with my supplier but haven't heard back yet on a refund for the shaft. I'm mainly worried about imbalance, but I don't have any evidence of that yet. I also have a new clunk in the front right, but haven't gotten under the car to have a look yet. It may just be an endlink.

 

They couldn't install the Cobb 6MT shifter because the reverse lockout cable was "too short." I'm going to play with it to see if I can get it to work. In the meantime, the stock height is obnoxious, and the 5MT shift boot for my STS is flopping around loose. Looks goofy.

 

Cost:

 

$4200 for 2010 STi tranny, shift linkage & shifter, clutch, R160 diff, 4EAT driveshaft

$50 for shift knob

$95 for six quarts of Extra-S

$740 for labor

 

Total = $5085, unless I've left something out. I still have to part out my 5MT bits.

Tits mcgee
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Picked up my car tonight & drove it home.

 

First impressions... WOW. Incredible. Snappy shifts on the stock STi shifter. And QUIET. I knew my tranny was making noises, but I had no idea how loud it was before it was gone.

 

The tech used the 5MT harness and sensors. Cruise control works. Reverse lights work. My cobbled reverse cam doesn't work in reverse, although my "reverse cam button" works fine. My USB charger for my iPhone doesn't work... but since those are both my doing, I'm sure they just screwed it up in the swap. I can't blame them for that.

 

Issues: my used 4EAT driveshaft has a loose bit of metal inside. It sounds like jingle bells at speeds under 10mph with the windows down. I checked with my supplier but haven't heard back yet on a refund for the shaft. I'm mainly worried about imbalance, but I don't have any evidence of that yet. I also have a new clunk in the front right, but haven't gotten under the car to have a look yet. It may just be an endlink.

 

They couldn't install the Cobb 6MT shifter because the reverse lockout cable was "too short." I'm going to play with it to see if I can get it to work. In the meantime, the stock height is obnoxious, and the 5MT shift boot for my STS is flopping around loose. Looks goofy.

 

Cost:

 

$4200 for 2010 STi tranny, shift linkage & shifter, clutch, R160 diff, 4EAT driveshaft

$50 for shift knob

$95 for six quarts of Extra-S

$740 for labor

 

Total = $5085, unless I've left something out. I still have to part out my 5MT bits.

 

Cobbled reverse cam????

 

On the Cobb shifter I wonder if they followed the instructions?

 

Have to flip reverse linkage forward and hold with Allen wrench to get slack in cable.

 

Yep it's a sweet swap one of my favorite

Edited by Scooby2.5
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