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post #1 of 14 Old Jul 27th, 2010, 10:06 pm Thread Starter
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2009 lt tranny swap

Does anyone know if a 6 speed GS tranny will fit on an "09" LT? I just think it needs one more gear.
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post #2 of 14 Old Jul 27th, 2010, 10:22 pm
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Re: 2009 lt tranny swap

Aren't 4th and 5th already overdrive gears? You need to have the revs up to make it perform anyway and mid 40's to low 50's mpg aint too bad. The engines are good for 200,000 miles or more geared the way they are. Why do you feel you need the change?


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post #3 of 14 Old Jul 27th, 2010, 10:41 pm Thread Starter
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Re: 2009 lt tranny swap

Well, the tack is showing 4k to 4.5 at 65 mph. Doesn't the GS run a little slower than that? If there were 6 gears would not the gears be a little closer and give you a more responsive bike?
I am asking just because I don't know how the trannys are geared to each bike.

I would assume the guys in the white coats at BMW know more than me but hell, it never hurts to ask.
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post #4 of 14 Old Jul 28th, 2010, 1:19 am
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Re: 2009 lt tranny swap

I found the gear ratios for the 1200 GS

1st gear1.583:1
2nd gear1.259:1
3rd gear1.033:1
4th gear 0.903:1
5th gear 0.903 :1
6th gear 0.805:1

K1200 LT '07 models which should be the same as the '09

1st Gear Ratio 2.05:1
2nd Gear Ratio 1.60:1
3rd Gear Ratio 1.27:1
4th Gear Ratio 0.96:1
5th Gear Ratio 0.70:1

Which means that the LT would turn lower RPM's in 5th gear while the lower 1st gear gives you the extra oomph necessary to get the big girl moving. Thiis assumes the FD ratio stays the same.

I googled: gear ration bmw gs and then gear ratio bmw k1200lt to get the info.

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Last edited by wa1200lt; Jul 28th, 2010 at 4:15 am.
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post #5 of 14 Old Jul 28th, 2010, 8:48 am Thread Starter
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Re: 2009 lt tranny swap

Learn something new every day.

Thanks for clearing that up for me.
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post #6 of 14 Old Jul 28th, 2010, 11:37 am
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Re: 2009 lt tranny swap

If you never use 5th unless you are on the Interstate at 70+ it will feel more normal when you do use it.

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post #7 of 14 Old Jul 28th, 2010, 12:01 pm
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Re: 2009 lt tranny swap

Quote:
Originally Posted by wa1200lt
I found the gear ratios for the 1200 GS

1st gear1.583:1
2nd gear1.259:1
3rd gear1.033:1
4th gear 0.903:1
5th gear 0.903 :1
6th gear 0.805:1

K1200 LT '07 models which should be the same as the '09

1st Gear Ratio 2.05:1
2nd Gear Ratio 1.60:1
3rd Gear Ratio 1.27:1
4th Gear Ratio 0.96:1
5th Gear Ratio 0.70:1

Which means that the LT would turn lower RPM's in 5th gear while the lower 1st gear gives you the extra oomph necessary to get the big girl moving. Thiis assumes the FD ratio stays the same.

I googled: gear ration bmw gs and then gear ratio bmw k1200lt to get the info.

Loren
That is showing both 4th and 5th gear of the GS as the same ratio. That cannot be right.

I just checked for the 2009 GS, and got these numbers:
1st 2.37:1
2nd 1.64:1
3rd 1.29:1
4th 1.06:1
5th 0.93:1
6th 0.84:1

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post #8 of 14 Old Jul 28th, 2010, 12:27 pm
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Re: 2009 lt tranny swap

Good catch David. Duh! It's just a ......... close ratio transmission! Yea! That's it!

But the fact remains that 5th gear on the LT is still more of an overdrive than 6th gear on the GS.

I did a cut and paste from my source. Didn't check the numbers except for 1st gear and the overdrive gears.

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post #9 of 14 Old Aug 16th, 2010, 12:51 pm
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Re: 2009 lt tranny swap

So does anyone know if the 07 and later transmission will fit the earlier LT ?

According to the numbers in the factory manual, the early LT does not have an overdrive gear.

Brett
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post #10 of 14 Old Aug 16th, 2010, 1:09 pm
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Re: 2009 lt tranny swap

Quote:
Originally Posted by kevincaron
Does anyone know if a 6 speed GS tranny will fit on an "09" LT? I just think it needs one more gear.
Even if this were possible, you'd have to remember of one gotcha: you would loose the reverse! Kind of important on such a heavy bike at times...

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post #11 of 14 Old Aug 16th, 2010, 1:09 pm
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Re: 2009 lt tranny swap

Again, all sources I could find show both 4th and 5th gears as overdrive gears.

4th : 0.96:1 - Overdrive less than 1.0:1
5th : 0.70:1 - Overdrive less than 1.0:1

I googled: bmw k1200lt 2001 transmission gear ratio.

Change 2001 to 1999 and you get the same results.

There are numerous results showing the above information.

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post #12 of 14 Old Aug 16th, 2010, 1:49 pm
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Re: 2009 lt tranny swap

Quote:
Originally Posted by kevincaron
Well, the tack is showing 4k to 4.5 at 65 mph. Doesn't the GS run a little slower than that? If there were 6 gears would not the gears be a little closer and give you a more responsive bike?
I am asking just because I don't know how the trannys are geared to each bike.

I would assume the guys in the white coats at BMW know more than me but hell, it never hurts to ask.
Something seems wrong here. My 07 runs about3K @ 60 MPH and 4K @ 80 MPH. I can't believe the 09 model has gearing that is so different from the 07. Is your clutch slipping?

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post #13 of 14 Old Aug 16th, 2010, 1:56 pm
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Re: 2009 lt tranny swap

Quote:
Originally Posted by wa1200lt
Again, all sources I could find show both 4th and 5th gears as overdrive gears.

4th : 0.96:1 - Overdrive less than 1.0:1
5th : 0.70:1 - Overdrive less than 1.0:1

I googled: bmw k1200lt 2001 transmission gear ratio.

Change 2001 to 1999 and you get the same results.

There are numerous results showing the above information.

Loren
Yeah, my googling shows the same thing, but the factory manual shows quite different numbers.
1st 3.864
2nd 3.022
3rd 2.393
4th 1.819
5th 1.511

They must be factoring something else in.
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post #14 of 14 Old Aug 16th, 2010, 1:59 pm
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Re: 2009 lt tranny swap

Quote:
Originally Posted by bretta
Yeah, my googling shows the same thing, but the factory manual shows quite different numbers.
1st 3.864
2nd 3.022
3rd 2.393
4th 1.819
5th 1.511

They must be factoring something else in.
I suspect one set are the tranny ratios and the other are the overall drive ratio which includes the FD ratio.

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