Oh yeah - I have a 2010 Silverado extended cab LT 5.3 Z71

Thanks in advance

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Find the 7th letter in the vin number. Then look in your manual & it should tell for the vin number what it is

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I have the same question, only engine codes are in the manual (unless I missed it).
I have a 2011 2500 6.0………. sorry for the hijack OP

 

I'd get in touch with the dealership or if u get in touch with GM Customer Service on this forum. GM Customer Service was able to PM my built list from my vin number. It showed EVERYTHING installed on my truck from the factory. Start with them, they should be able to lead u in the right way.

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I would be more than happy to look up and find that information for you. Could you please private message me your vehicle identification number so I can do the proper research.

Thank you,

Jessica L.
GM Customer Care

 

FYI, you most likely have the 6L80. The 6L90 was introduced into only HD trucks in 2008. I found this out at the dealer.

 

6L80E is in series 1500 trucks

6L90E is in series 2500 trucks, no 1500 (1/2 ton) gets a 6L90.

 

Trans is NOT designated in a light truck VIN....
Digits:
1 - 3 World Make Identifier
4 - GVWR/Brake System/Body Style
5 - 6 Line/Chassis/Series
7 - Restraint System
8 - Engine Type
9 - Check digit
10 - Model year
11 - Plant
12 - 17 - Production serial number

 

GM if your monitoring this site

Trying to decide what to buy -- Truck will be optioned for trailer towing, if 1/2 ton it will have the 9 3/4 in ring gear & 7.3 something rear axle ratio -- Not sure about 3/4 ton specifications

What transmission comes in a 2014 1/2 ton gas Silverado with the trailer towing option -- 5.3 & 6.2 Ecotec3 engine

Would the transmission be different if the trailer towing option was not chosen

I am interested in the same information if it were a 2014 3/4 ton gas Silverado 2500HD

Will the transmissions offered in the GMC trucks be the same as the Chevrolet

I guess easier said, what are all the possible transmission available for the 1/2 & 3/4 ton Chevy & GMC trucks.

Thanks in advance

 

I am not GM but I can answer the questions. Only 3 transmission used in 2014 trucks as described below.

Trying to decide what to buy -- Truck will be optioned for trailer towing, if 1/2 ton it will have the 9 3/4 in ring gear & 7.3 something rear axle ratio -- Not sure about 3/4 ton specifications

Yes
Max Trailering Package, includes 9.76" rear axle, (GT4) 3.73 rear axle ratio, (JL1) trailer brake controller, enhanced cooling radiator, revised shock tuning for increased control, heavier duty rear springs and increased RGAWR
1 - Includes (G80) heavy-duty automatic locking rear differential and Z82 Trailering Package. Requires (L83) 5.3L EcoTec3 V8 engine. Includes (PZX) 18" x 8.5" bright-machined aluminum wheels with (RBX/RBW) 18" tires or may upgrade to (RD4) 20" aluminum wheels with either (RC7) or (QSS) 20" tires.
2 - With (L83) 5.3L EcoTec3 V8 engine, requires (PZX) 18" x 8.5" aluminum wheels and (RBX/RBW) 18" tires or may upgrade to (RD2) 20" chrome wheels with either (RC7) or (QSS) 20" tires. With (L86) 6.2L EcoTec3 V8 engine, requires (RD2) 20" chrome wheels with (QSS) 20" tires. Not available with (Z71) Off-Road Suspension Package.


What transmission comes in a 2014 1/2 ton gas Silverado with the trailer towing option -- 5.3 & 6.2 Ecotec3 engine

RPO MYC 6L80 HD 6-sp

Would the transmission be different if the trailer towing option was not chosen

No

I am interested in the same information if it were a 2014 3/4 ton gas Silverado 2500HD

RPO MYD 6L90

Will the transmissions offered in the GMC trucks be the same as the Chevrolet

Yes, identical in all respects mechanically, appearance and creature comforts are only difference between the brands

I guess easier said, what are all the possible transmission available for the 1/2 & 3/4 ton Chevy & GMC trucks.

Only 3 transmission in use...
6L80 1500
6L90 2500, 2500 gas engines
Allison 1000 2500, 2500 Diesel engines only

MYC - (1500) Transmission, 6-speed automatic, electronically controlled with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking

MYD - (2500,3500) Transmission, 6-speed automatic, heavy-duty, electronically controlled with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking
1 - Requires (L96) Vortec 6.0L V8 SFI engine or (LC8) 6.0L V8 SFI Gaseous engine

MW7 - (2500,3500) Transmission, Allison 1000 6-speed automatic, electronically controlled with overdrive, electronic engine grade braking and tow/haul mode
1 - Requires (LML) Duramax 6.6L Turbo Diesel V8 engine.

These options require an LT or LTZ trim level, double or crew cabs only

 

Thanks Z15

I appreciate your timely response and all the good information.

 

easy answer rpo code myc is 6l80e and rpo code myd is 6l90e in the glovebox

 

1/2 ton trucks come with a 6L80E transmission. IMHAO, the 1500 with a towing package will tow a decent amount and should be sufficient for most people but, experience with lighter transmissions show they aren't meant to tow heavy loads for long periods. 3/4 & 1 ton trucks come with a 6L90E transmission. Both the 3/4 & 1 ton come with either a 3.73 or a 4.11 gear altho the 1 tons usually have just the 4.11 gears as they are rated to tow more. (10K for 3/4 ton and up to 30K for diesels) The heavier trucks have a 14 bolt floating axle ratcheting type of differential called a "Gov-lock" positraction.

Again, IMHAO, if you are planning on towing a lot, get the heavier trucks. If you tow a boat of small trailers now and then, the 1/2 ton would work as long as you don't try and tow more than you really should. (Be honest here)

 

Will the 6l80 work in a 3/4 ton that has a bad 6l90 in it ?

 

No