Question about 2002 Triumph Triumph Thunderbird

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6th gear modification

Hi all. Has anyone out there replaced their 5-speed transmission with a 6-speed? I'm torn on whether to make this conversion on my '95 Tbird. I need your help to figure this out quick, while my mechanic still has my tranny out of the bike (damn you, sprag clutch!). With a 6-speed, are the ratios the same for 1-5, and the sixth purely an overdrive gear, or do the top and bottom ends of the gear range stay basically the same, with smaller intervals between? The main thing I'd hope for out of a sixth gear is improved gas mileage. (I currently average about 36mpg) Did you get a boost in mpg after your conversion? How much? Any other performance considerations? With parts ($425) and labor ($100) this conversion is not something I can easily afford on top of the other work being done, but now would be the time to do it. Thanks for your input!

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Sixth Gear is an additional ratio. The five speed bikes have a spacer on the shaft instead of the sixth gear, so the conversion is not so difficult for someone who knows what they are doing. The shifter drum also needs to be changed. I've not done the conversion, but I have one six speed bike and one five speed bike. Sixth gear is nice for highway use. In reality it only changes RPM at 70 mph by about 500 revs. But that is enough to make cruising at higher speeds a little more relaxed. Is it necessary? Hmmm, I guess that depends on how much time you spend cruising on the Interstates. Personally I avoid Interstates most of the time, so I find it not much of a problem. Good luck with your decision, and you are right now is the time to do it if you are going to.

Posted on Nov 10, 2008

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3 Answers

Can I put a 366 cid engine and a 5-speed transmission in a 1988 1Ton 4WD Chevy P/U with the C/K body style?


Yes for the 366 since it is a MKIV like the 454; the difference is the taller deck making it taller and wider, but I would expect there is plenty of room in the C/K engine bay for the taller deck 366 MK IV. Note the 366 also takes a different intake than the short deck MK IV.. What 5 speed is it. The 5 speed may (very likely will) be different than the 4 speed that came in the truck. Since you have a 4WD, the location of the output of the 5 speed vs-a-vis the 4 speed is quite important. You may be looking at altering location of the transfer case and changing the length of both drive shafts from the transfer case to the banjos. If you have a drive train specialty shop in your area I would get their input on the changes (cost) involved in the possible drive train changes required by the length difference between the 5 speed and the 4 speed gearbox.

Jan 09, 2015 | 1988 Chevrolet K3500

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General Motors gear ratios hide] 1 GM Rear Wheel Drive...


General Motors gear ratios
hide]

GM Rear Wheel Drive Transmissions

PTU = Power Transfer Unit (Crossover SUV AWD/4WD)

6 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
MNK Allison 1000
MNZ Allison 1000
MW7 Allison 1000
MYB
MYC

5 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M74 Allison 1000
M22 5L50-E
M82 5L40-E
MTW Allison 2400
MX4 Allison 2000
MX5 5L40-E with PTU*
MV3 5L50-E with PTU*

4 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M30 4L60-E
M32 4L60-E HD
M32 4L65-E
M33 4L60-E Hybrid
M41 4L30-E
M70 4L70-E Super Duty
M99 2ML70 2-mode Hybrid*
MD8
ML4 4L30-E
MN8 4L80-E HD
MN8 4L85-E
MT1 4L80-E
MW9 HM 200-4R
  • EVT Mode 1 The 2ML70 can operate in electric mode or non-electric mode in first gear with a gear ratio of infinity to 1.70:1.
  • EVT Mode 2 The 2ML70 operates in non-electric mode with a gear ratio of 1.70 - 0.738:1

3 Speed Automatic Transmissions

RPO Trans Name 1st 2nd 3rd
M40
M41
M65
MD2
MD3 HM-180
HM-200C
HM-350
HM-400

GM Front Wheel Drive Transaxles

6 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
MH2
MH4
MH6 6T75 (AWD)
MH7
MH8
MY9 6T75 (AWD)

5 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
Aisin-AW 55-51LE
M09 Aisin-AW AF33-5
M43 Aisin-AW AF23-5
M45 Aisin-AW AF33-5
M98 AF33-5
MJ7 Honda 5AT
MJ8 Honda 5AT w/PTU*
MLS Aisin 50-40E
MU3 Saab 76.5mm

4 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
MLQ Aisin 81-40LE
Aisin ZF 4HP 16
HM 325-4L
Jatco JF405-E
M10 Jatco JF403-E
M13 4T60-E HD
M13 4T60-E
M15 4T65E
M45 Aisin-AW AF33
M57 A245-E
M76 4T65E with PTU*
MD7 4T65E
ME7 4T45-E BAS Hybrid
ME8
ME9
MH1 4T80-E
MN3 4T65E
MN4 4T40/45-E
MN5 4T45-E
MN7 4T65E HD
MS7 A240-E
MU4 A246-E
MU5 U341-F

3 Speed Automatic Transaxles

RPO Trans Name 1st 2nd 3rd
M60 GEO Metro
MB3 A131L
MD9
MX1 A131L
GEO Storm
HM-425

GM Manual Transmissions

6 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M10 Tremec 85mm
M12 Tremec T56
ML6 ZF S6-650
ML9 ZF S6-40
MM6 Tremec T56
MV1 Aisin 85mm
MV5 Aisin D173 AY6
MV6 Aisin 85mm
MZ6 Tremec 85mm

5 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M35 Getrag 260
M35 Getrag 260 (2003-2004 Cadillac CTS)
M49 BW 5spd
M50
M59 GEO Tracker
M86 Getrag F23 75mm
M94 Getrag F23
M96 Tremec 109mm
MA5 Aisin AR5 82mm
MG3 Getrag F23
MG5
M50
M51
MH3 Tremec T-5
MK5 C59
ML2 Tremec T-5
ML3 Tremec T-5
MT8
MU3 Saab F25
MW2
MW3 NV4500 109mm
TR-3450
TR-4050
TR-4050
2007 Chevrolet Optra and Spark (Trans code Y4A)
2007 Chevrolet Optra and Spark (Trans code Y4M)

4 Speed Manual Transmissions

RPO Trans Name 1st 2nd 3rd
M20 HM-117
M73 Isuzu
MC0 Getrag
MC9
MY6 NP260

More GM Manual Transmissions

6 Speed Manual Transaxles

RPO Trans Name 1st 2nd 3rd
MT2 Opel F40 83mm
MU9 Opel F40 83mm
MTN Toyota C60

5 Speed Manual Transaxles

RPO Trans Name 1st 2nd 3rd
D-16 (2005-2008 Chevrolet Aveo 1.4 DOHC / 1.5L)
D-16 (2005-2008 Chevrolet Aveo 1.4 SOHC)
Y4A (2007 Pontiac Matiz)
YM4 (2005-2007 Chevrolet Aveo)
D-20 (2005-2007 Chevrolet Epica)
L73 Pontiac LeMans F16
M42 Geo Metro
M43 AF23
M49 BW 5spd
M58 Geo Metro
M79 LeMans F13
M86 Getrag F23 (5T45MI)
M94 Getrag F23
M98 Aisin 55-51E
MB4 Geo Prizm 1.8L
MB5 Geo Prizm
MFB 2008 Chevrolet Epica 5-Speed S/R (D24)
MFN 2008 Chevrolet Epica 5-Speed S/R (D33)
MG1 HM-282
MG2 HM-282
MG3 Getrag F23
MJ1 Isuzu
MK7 Isuzu
MLM Y4M (2008 Chevrolet Aveo 1.6 DOHC)
MR3 Isuzu
MU3 Saab F25
MV2 Chevrolet Sprint
MY7 Early J-car

GM Continuously Variable Transaxles

RPO Trans Name Lowest Highest
M83 V20-E
M75 V25-E
M16 V25-E AWD

on Apr 15, 2015 | GMC Cars & Trucks

1 Answer

Can an overdrive be fitted to an Automatic four speed transmision in a Mitsubishi Fk617 2002 model truck


The transmission in that should be a M060S6 and it has 6 forward gears. 6th gear is overdrive with a ratio of .786

Jun 02, 2014 | 2002 Mitsubishi L

1 Answer

How to stop the transmission noise in 5th gear on a 2007 HD Ultra Classic?


The 5th gear noise with the 6 speed is legendary!

1st and 5th are straight cut gears. 2nd,3rd,4th, and 6th are helical cut gears. Straight cut are stronger so Harley put them in the most popular gears.

Some people swear that either Mobil Syn 75/90 or Redline Shockproof 85/140 helps.

Baker transmissions make a F6F kit that has a helical cut gear, and a thicker trapdoor to handle the increased side loading because of it, but it ain't cheap!

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2 Answers

I have 2003 yz 125 it runs teriffic and shift's grate 1-5 but it wont go in to 6st gear . any ideas


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1 Answer

Can i put a 6th gear in my vstar transmission?


Hi, Monte335 for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.ymhmotoboard.com/topic/6-speed-transmission
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6 speed transmission
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2003/LIT-11626-16-05_22.pdf

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