What Transmission do i have

[JustPlaneMike]

I have a 2008 GMC Yukon Denali with a 5.3. The shifter is
P R N D 3 2 1. How can I tell if I have a 4L60E or a 4L70E. Thanks

 

[Joseph Garcia]

@NickTransmissions

 

[Marky Dissod]

Inside your glovebox you should find a sticker with many 3 character codes on it.
Look for either M30 (4L60E) or MYC (6L80E).

MD8 = 700R4 / 4L60 (no 'E')
M30 = 4L60E
M32 = 4L65E (4L60E Heavy Duty)
MD6 = 4L65E (what is 'PTU'?)
M70 = 4L70E (Super Duty) (somebody with a TrailBlazer SS, please check their RPOs?)

MT1 = 4L80E
MN8 = 4L85E (Heavy Duty, think 6.6L DuraMax)

MYC = 6L80E
MYD = 6L90E (Heavy Duty, think 6.6L DuraMax)

M5U = 8L90E
MQE = 8L90E with 'improvements'

MF6 = 10L80E
MX0 = 10L90E

 

[Doubeleive]

I have a 2008 GMC Yukon Denali with a 5.3. The shifter is
P R N D 3 2 1. How can I tell if I have a 4L60E or a 4L70E. Thanks

I think you typed the year wrong, a 2008 denali would not be a 4sp, it would be a 6l80 6-speed and it would say PRNDL
nbs 2000-2006 they had the 4l60, unless someone changed it.

 

[mikeyss]

I don't think Denali's ever had a 5.3 option in 08 or at any other time?

 

[Doubeleive]

I don't think Denali's ever had a 5.3 option in 08 or at any other time?

ya that too, missed that one

 

[NickTransmissions]

I have a 2008 GMC Yukon Denali with a 5.3. The shifter is
P R N D 3 2 1. How can I tell if I have a 4L60E or a 4L70E. Thanks

You should have a 4L70E if your shift indicator has that pattern. Look for M70 RPO code in your glove box though as @Doubeleive said, you should have a 6L80 (RPO=MYC) for that year.

 

[Fless]

@JustPlaneMike this is posted in the 2000-2006 section. Check your year and put your year, make, model, and trim in your signature so it's always in your posts.

Then we can move this thread if needed. You'll get more accurate answers posting with good info in the correct section.

 

[JustPlaneMike]

@JustPlaneMike this is posted in the 2000-2006 section. Check your year and put your year, make, model, and trim in your signature so it's always in your posts.

Then we can move this thread if needed. You'll get more accurate answers posting with good info in the correct section.

Is there a way to add signature and save it or do i have to enter it every time? Ps I searched for an answer before posting and could not find one, thanks

 

[JustPlaneMike]

You should have a 4L70E if your shift indicator has that pattern. Look for M70 RPO code in your glove box though as @Doubeleive said, you should have a 6L80 (RPO=MYC) for that year.

Thanks but I don't see it, here is a pic

 

[JustPlaneMike]

I think you typed the year wrong, a 2008 denali would not be a 4sp, it would be a 6l80 6-speed and it would say PRNDL
nbs 2000-2006 they had the 4l60, unless someone changed it.

Thanks, Thought it was a denali but double checking since your reply i just have a Yukon XL 1500. It is a 2008 with the D321,

 

[JustPlaneMike]

Thanks but I don't see it, here is a picView attachment 447984

PS, just verified it's not a Denali, just a 2008 Yukon XL 1500 with D321 shifter.

 

[JustPlaneMike]

Inside your glovebox you should find a sticker with many 3 character codes on it.
Look for either M30 (4L60E) or MYC (6L80E).

MD8 = 700R4 / 4L60 (no 'E')
M30 = 4L60E
M32 = 4L65E (4L60E Heavy Duty)
MD6 = 4L65E (what is 'PTU'?)
M70 = 4L70E (Super Duty) (somebody with a TrailBlazer SS, please check their RPOs?)

MT1 = 4L80E
MN8 = 4L85E (Heavy Duty, think 6.6L DuraMax)

MYC = 6L80E
MYD = 6L90E (Heavy Duty, think 6.6L DuraMax)

M5U = 8L90E
MQE = 8L90E with 'improvements'

MF6 = 10L80E
MX0 = 10L90E

Fantastic excellent reply , THANKS found the M30 code in the glove box.

 

[JustPlaneMike]

PS, just verified it's not a Denali, just a 2008 Yukon XL 1500 with D321 shifter.

Got it thanks M30

 

[NickTransmissions]

Thanks but I don't see it, here is a picView attachment 447984

You dont see it because that vehicle has a 4L60E. See "M30" - 4th row down, 2nd from right.

 

[JustPlaneMike]

Thanks

 

[swathdiver]

PS, just verified it's not a Denali, just a 2008 Yukon XL 1500 with D321 shifter.

SLT trim level with LC9 all aluminum 5.3 engine.

 

[Fless]

Is there a way to add signature and save it or do i have to enter it every time? Ps I searched for an answer before posting and could not find one, thanks

Click on your username in the upper right-hand corner of the screen and select "Signature." You can edit it there, and it will show up on every post you make.