What Transmission do i have

[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.