5mt out 6mt in

kleinkid · Post by **kleinkid** » Fri May 02, 2008 4:46 pm

Josh--No bad noise. Different sound than the 5 speed. Some sounds I attribute to the lightweight flywheel. About 500 mi. since the swap.

BXSS · Post by **BXSS** » Fri May 02, 2008 4:53 pm

93forestpearl wrote:Only the '07 has the 3.545 final.

BTW, brand new '07 6mt's can be had from the dealer for about $3800 right now. For some reason Subaru is selling them cheap.

That is not a bad price for a NEW 6spd.

Is that a shop price or a regular customer price?

asc_up · Post by **asc_up** » Fri May 02, 2008 8:45 pm

Hmmm. Does that seem weird to anyone else that he wasn't hearing any bad noises? Like shouldn't the back wheels be 'skipping' every once in awhile if you have the wrong rear diff?

jake15 · Post by **jake15** » Fri May 02, 2008 9:41 pm

asc_up wrote:Hmmm. Does that seem weird to anyone else that he wasn't hearing any bad noises? Like shouldn't the back wheels be 'skipping' every once in awhile if you have the wrong rear diff?

no..... the only way the back wheels would "skip" would be if it had a welded center diff and it was trying to turn the front and rear wheels at different speeds. its probably putting alot of wear on the center diff/transfer gears (kind of like a not as damaging version of towing an awd car with the back wheels on the ground)

asc_up · Post by **asc_up** » Fri May 02, 2008 9:43 pm

Ah I see now. That makes sense.

93forestpearl · Post by **93forestpearl** » Sat May 03, 2008 5:51 am

BXSS wrote:
93forestpearl wrote:Only the '07 has the 3.545 final.

BTW, brand new '07 6mt's can be had from the dealer for about $3800 right now. For some reason Subaru is selling them cheap.
That is not a bad price for a NEW 6spd.

Is that a shop price or a regular customer price?

Customer price of $3900-3700, depending on how well you know the parts guy. That includes the slave. For some reason they are selling them cheap. I don't know if its still going on, you'd have to call the dealer. Maybe they realised there is a hot market for the 6 speed. Who knew?

The extras to do swap aren't that bad. There's tons of Legacy auto driveshafts to be had in junkyards. The linakge can be cheap or expensive dpending on how quickly you need it. I have a set...

If you have a SS, you already have a 3.90. Stubs, $100. Stock clutch, $???. I have a set at mid life.

kleinkid · Post by **kleinkid** » Sat May 03, 2008 8:16 pm

OK, I'm gathering parts to get a different rear diff in. Got an '02 WRX rear diff(3.545), and axles, side seals on order. Going to do the rear wheel bearings and seals at the same time. Also orderd a Whiteline subframe bushing kit and the lockdown bolts. I'll start work on it week after next.

asc_up--I'm guessing that the DCCDPro dccd auto controller was working real hard trying to figure out what was going on, and hopefully may have prevented any damage to the tranny.

93forestpearl · Post by **93forestpearl** » Sun May 04, 2008 7:20 am

Since the auto controller only references TPS and the two axis G-sensor, it was probably just doing its thing.

kleinkid · Post by **kleinkid** » Thu May 08, 2008 1:54 am

Hypothetically, if you were at 3000 rpm at 70 mph in 6th gear with a 3.90 rear differential, what would the rpm be at 70 mph with a 3.545 rear differential?

evolutionmovement · Post by **evolutionmovement** » Thu May 08, 2008 2:16 am

2727 rpm. The maths: 3.545/3.9 = .909 (or 3.545 = 90.9% of the rpm with the 3.900). .909*3000rpm = 2726.922

kleinkid · Post by **kleinkid** » Thu May 08, 2008 6:20 am

Thanks, I think I'll like that. Good idea to show the math.

kleinkid · Post by **kleinkid** » Sun May 18, 2008 3:37 am

I purchased an '02 WRX rear diff. 3.545 ratio, and the two axles. Put new side seals in the WRX diff, Whiteline rear differential support bushings, part number KSB 751, new bearings and seals in the hubs, new parking brake shoes, and had the rotors turned. Took the rear diffs to Pacific Import Auto and they swapped the companion flanges. The car feels better and shifts smoother. I wonder if I need to have the alignment checked after having the rear end apart line that?

93forestpearl · Post by **93forestpearl** » Mon May 19, 2008 1:14 am

Depends on what you took apart on the rear. I like to take out the big nasty lateral link bolt on the knuckle so I don't have to get an alignment.

kleinkid · Post by **kleinkid** » Mon May 19, 2008 4:03 pm

I removed the knuckle/hub completely to put new seals and bearings in. Going to get the alignment checked.

Post by **Legacy777** » Mon May 19, 2008 6:09 pm

Yeah, you need to get it aligned.

ciper · Post by **ciper** » Sat May 24, 2008 7:43 am

Can I ask a simple question? Will Legacy 5mt stubs fit into the 6mt assuming you get the matching seals? According to Nasioc the 02-mid04 WRX 5mt stubs fit the 6mt.

Is this the correct breakdown of center reduction gears?
04-05 is 1:1, 3.9 ring and pinion in rear
06-07 is 1.1:1, 3.54 ring and pinion in rear

The part number for the stock axle stub in a 6mt is 38415AA110 plus Circlip 805329010 (times two of each)
The seals for a stub on a 6mt have part numbers
Left: 806730041
Right: 806730042

kleinkid · Post by **kleinkid** » Sat May 24, 2008 6:19 pm

The center reduction ratios you listed are correct.

The stub shaft, seals, and circlip, part numbers you listed are what I used.

93forestpearl · Post by **93forestpearl** » Sat May 24, 2008 7:26 pm

I tore my 5 speed apart to get the stubs only to find that they will not work. The 5mt stubs are held in by a snap ring and the groove for that is not large enough for the circlip that holds the stubs in the 6mt. If the newer one holds the circlip it should be fine.

Old 5mt on top, the ones I got for the 6mt on the bottom

ciper · Post by **ciper** » Wed May 28, 2008 11:40 pm

93forestpearl wrote:I tore my 5 speed apart to get the stubs only to find that they will not work. The 5mt stubs are held in by a snap ring and the groove for that is not large enough for the circlip that holds the stubs in the 6mt. If the newer one holds the circlip it should be fine.[/img]

Great info. So to make things clear I can use the old Legacy axles with the STI 6 speed stubs.

93forestpearl · Post by **93forestpearl** » Thu May 29, 2008 6:46 pm

^ Correct. Thats what I did. STi axles and that crap are for the birds. Old axles are cheap to replace, so I'm fine with it.

Someday I may have to make hybrid rear axles for a R180, but I have to fry my VLSD first.

chochocho · Post by **chochocho** » Fri May 30, 2008 4:41 pm

a great read. for a 91 legacy ss? what would be a complete parts list to get this to work? thanks in advance.

it's time to save those subaru bucks

93forestpearl · Post by **93forestpearl** » Fri May 30, 2008 7:03 pm

6mt
Matching rear end. 04-05: 3.90 , 06-07: 3.545
Auto driveshaft
6mt shifter linkage
6mt clutch & flywheel

I think '04's had the stubs already, or some of them maybe, but my '05 tranny did not.

Axle stubs - 38415AA110 and circlips 805329010

You would need matching seals, and I don't have a part # for those offhand.

You don't have to have a DCCD controller right away. It is interesting with no controller and an open rear diff though. I've got Spiider's controller now and it is worlds of difference.

ciper · Post by **ciper** » Fri May 30, 2008 8:18 pm

I've had this crazy idea for a few years and wanted to do it and surprise everyone but my life is going crazy right now and decided not to hold back.

Unless i misunderstand the function,,, couldn't a single channel megasquirt be used to control the DCCD? Think about that for a second...

93forestpearl · Post by **93forestpearl** » Fri May 30, 2008 8:34 pm

I suppose with the open-source nature of the megasquirt you could write some pretty badass code for it. I'd want to reference throttle, boost, speed, among others. The only thing that is nice to have is a 2 axis g-sensor like Spiider's unit does. Then it can make decisions based on what the car is doing.

SP-Boxer · Post by **SP-Boxer** » Mon Jun 02, 2008 5:05 pm

John, you realize that the spot for the headlight leveler switch is taken now

I missed this thread, but that 6spd in a BC is hot

legacycentral bbs

A forum for 89-94 BC-BF(BJ) Legacy Owners and Fans

5mt out 6mt in

done