GS6-53DZ swap to GS6-45BZ?

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_Calle_

Lurker
Jul 7, 2017
17
Germany
Hi,

when I installed my twin disc clutch I noticed that my input shaft of the transmission (GS6-53DZ) have to much play. The shifts between the gears are also not as smooth. It feels like the gears not synchronize as the should. So I think it is the reason of the play in the input shaft.
So I was searching a used transmission. At this time I found aut the new GS6-45BZ would also fit, I also need to change the cardan wave from the N55.
The GS6-45BZ is a newer generation, shifts smoother and weighs 10KG / 22lb less than the 53DZ.
Have anyone done the swap yet?
 
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doublespaces

Administrator
Oct 18, 2016
7,728
AZ
I know @AzNdevil has just imported a 6MT, not sure which version it is. The 45BZ comes in which cars? I think it is the transmission in the F80 and maybe even the 1 series?
 

_Calle_

Lurker
Jul 7, 2017
17
Germany
The 53DZ comes with the N54, the 45BZ comes with N55 engines, also the 1 series M (N54).
And on the M2,M3,M4 but with a lager bell hosing.
B58 also have the 45BZ but not sure about the bell housing. After double check, the B58 have a different starter position.
Gear ratio ist always the same.
 
Last edited:
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doublespaces

Administrator
Oct 18, 2016
7,728
AZ
Well considering its a manual I can't imagine too many issues but you never know. I'm curious to see what you find out.
 

Hydra Performance

Sergeant
Free Vendor
Jan 31, 2017
294
@_Calle_
I have a spare N55 (45BZ) box over here if you like. The shifter parts are different, and the driveshaft is 20mm longer with the N55 trans (although the slip yoke between the two driveshaft halves should make up the difference. Also, the 45BZ uses a pilot bushing in the flywheel instead of the 53BZ nipple arrangement, so you will have to convert yours. I've run both on my car and I prefer the 45BZ, plus its 13kg lighter :)
 

AzNdevil

Corporal
Nov 4, 2016
236
Hong Kong
@_Calle_
I have a spare N55 (45BZ) box over here if you like. The shifter parts are different, and the driveshaft is 20mm longer with the N55 trans (although the slip yoke between the two driveshaft halves should make up the difference. Also, the 45BZ uses a pilot bushing in the flywheel instead of the 53BZ nipple arrangement, so you will have to convert yours. I've run both on my car and I prefer the 45BZ, plus its 13kg lighter :)
this pretty much sums it up... there are 2/3 revisions of the 53DZ box... the hgx version supposingly has better synchros but its not easy to find one with low miles... the jdc ones are easier to find but personally have tried a few and they either feel shitty shifting into 2nd or into 3rd

also, the internals of the 53DZ is stronger than the 45BZ according to google so if you are like 600rwhp+ then this might not be an option for you

on top you will need to do the flywheel and driveshaft to match the gearbox and maybe the driveshaft... unless you have a box laying around already its probably not be worth it
 
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_Calle_

Lurker
Jul 7, 2017
17
Germany
@_Calle_
I have a spare N55 (45BZ) box over here if you like. The shifter parts are different, and the driveshaft is 20mm longer with the N55 trans (although the slip yoke between the two driveshaft halves should make up the difference. Also, the 45BZ uses a pilot bushing in the flywheel instead of the 53BZ nipple arrangement, so you will have to convert yours. I've run both on my car and I prefer the 45BZ, plus its 13kg lighter :)
That´s right, driveshaft is what I mean with cardan wave. My rusty shitty English :laughing:
The nipple at my flywheel can be removed, it´s only an insert. at this time I also prefer the 45BZ. Regarding the shifter I think they will also fit on the 45BZ.
Thanks for the offer, but I thing the shipping from Lebanon to Germany would very expensive. I found a low mileage trans for 800€ here.
 
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_Calle_

Lurker
Jul 7, 2017
17
Germany
this pretty much sums it up... there are 2/3 revisions of the 53DZ box... the hgx version supposingly has better synchros but its not easy to find one with low miles... the jdc ones are easier to find but personally have tried a few and they either feel shitty shifting into 2nd or into 3rd

also, the internals of the 53DZ is stronger than the 45BZ according to google so if you are like 600rwhp+ then this might not be an option for you

on top you will need to do the flywheel and driveshaft to match the gearbox and maybe the driveshaft... unless you have a box laying around already its probably not be worth it

Thanks for the Info, so I will look if I found a low mileage HGX version. my current trans is TJGK and is horror to shift.
Regarding the trans Label 53DZ and 45BZ the 53DZ should hold more power, but I think the 45BZ will hold also more power, the 45BZ is also mounted with the S55 engines. I´ve not plan to go more than 600rwhp.

Flywheel will prepare by my self, driveshaft is around 150€, 45BZ is around 800€ so it is less then 1000€. the 53DZ cost here around 1500€ an thats not the HGX version.
 

gmx

Specialist
Dec 8, 2017
55
@_Calle_
I have a spare N55 (45BZ) box over here if you like. The shifter parts are different, and the driveshaft is 20mm longer with the N55 trans (although the slip yoke between the two driveshaft halves should make up the difference. Also, the 45BZ uses a pilot bushing in the flywheel instead of the 53BZ nipple arrangement, so you will have to convert yours. I've run both on my car and I prefer the 45BZ, plus its 13kg lighter :)
Bumping this up in general. Any OEM clutch/flywheel options we can use from S55 cars or even the M2 for example? The 1M DMFW is hard to get :/
 

gmx

Specialist
Dec 8, 2017
55
Yeah nah.
SMFW is full retard esp on a 1M.
Been there, done that, lots of times. Spec, CM, Fidanza... the lot of 'em.
 
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_Calle_

Lurker
Jul 7, 2017
17
Germany
Bumping this up in general. Any OEM clutch/flywheel options we can use from S55 cars or even the M2 for example? The 1M DMFW is hard to get :/
Sadly NO.
The S55 engines have a bigger bellhousing at the transmission to fit the bigger Flywheel und clutch package.
 

gmx

Specialist
Dec 8, 2017
55
That's fine. Looking for more detail, where are the stack height measurements of each component?
All I know so far is the total stack height is obviously longer on the s55 hence the longer bellhousing.
 

vachfolle

New Member
Apr 22, 2018
1
You should have a GS6-53BZ, the DZ version are for diesel engine, and have different gear ratio.
GS6-53BZ - 4,050 / 2,390 / 1,580 / 1,190 / 1,000 / 0,872 / R 3,677
GS6-53DZ - 5,080 / 2,804 / 1,783 / 1,260 / 1,000 / 0,835 / R 4,607
 

_Calle_

Lurker
Jul 7, 2017
17
Germany
That's fine. Looking for more detail, where are the stack height measurements of each component?
All I know so far is the total stack height is obviously longer on the s55 hence the longer bellhousing.
Sorry, I have no more details so far.
 

_Calle_

Lurker
Jul 7, 2017
17
Germany
You should have a GS6-53BZ, the DZ version are for diesel engine, and have different gear ratio.
GS6-53BZ - 4,050 / 2,390 / 1,580 / 1,190 / 1,000 / 0,872 / R 3,677
GS6-53DZ - 5,080 / 2,804 / 1,783 / 1,260 / 1,000 / 0,835 / R 4,607
This should actually be the case.
But if you take a look at RealOEM or similar, the 135i´s transmission is named GS6-53BZ und the 335i´s is named GS-53DZ. But I down´t no why.

Normally it´s as you say, DZ for diesel and BZ for gasoline.
 

_Calle_

Lurker
Jul 7, 2017
17
Germany
Now I swap my transmission to the GS6-45BZ last week.
I´m more than happy with the results, it shifts a lot better than the GS6-53BZ, it is absolut amazing and was worth the new transmission and the work.

It was necessary to modified my 8-bold flywheel to put the pilot bearing into it.
I make an adapter to put the flywheel an the lathe to remove the weld that holds the pilot pin in the middle. Afterwards I put the pilot bearing in place.
Refill the transmission with Rowe HIGHTEC ATF DCG II oil, changed some shifter parts, put some polyurethane bushings into it and put all the stuff together.

@Hydra Performance
thanks for your advice! :sunglasses:

IMG_3879.JPGIMG_3885.JPGIMG_3882.JPGIMG_3960.JPGIMG_3456.JPGIMG_3964.JPG
 

_Calle_

Lurker
Jul 7, 2017
17
Germany
So which cars can the 45bz come from and can the 53bz be improved?
The 45BZ come with all N55 cars so far I know, mine came from a F20/F22.
The 53BZ can not improved, there are no parts or spare parts on the marked. The 45BZ can hold enough power/torque, it is also an S55 engines with another bell housing. And there are synchron rings as spare parts on the market if there are worn.
 

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