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Open Roads Forum  >  Tow Vehicles

 > What transmission does my 04 suburban 2500 have?

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Turnkey Brent

Nokomis, IL

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Posted: 05/31/12 06:18pm Link  |  Print  |  Notify Moderator

I just purchased a (new to me) 2004 Suburban 2500 with the 8.1 liter big block, 4wd, and 4.10 gears. The transmission is a 4 spd tranny. Which one did GM put in these trucks.

Greg Bunting

Port St. Lucie, FL

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Posted: 05/31/12 06:39pm Link  |  Print  |  Notify Moderator

I have the '05 2500HD truck, and the owners manual says it is an Allison.

MudChucker

Niverville Manitoba

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Posted: 05/31/12 07:07pm Link  |  Print  |  Notify Moderator

the diesels will have the alison... gas engine will not...up until 07 you will have the 4L80E transmission.


2005 PILGRIM 274RL 5SS
2007 GMC Sierra 2500HD SLT 6.0


CKNEK

White Rock, B.C.

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Posted: 05/31/12 07:30pm Link  |  Print  |  Notify Moderator

The 8.1L in the pickups came with the Allison. The Burbs got the 4L80E.


07 GMC CCSB LBZ Duramax with a few goodies.

KD4UPL

Swoope, VA

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Posted: 05/31/12 07:37pm Link  |  Print  |  Notify Moderator

CKNEK wrote:

The 8.1L in the pickups came with the Allison. The Burbs got the 4L80E.


Nailed it.

bartlettj

Forest Grove, OR

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Posted: 05/31/12 08:22pm Link  |  Print  |  Notify Moderator

If you still have the RPO code sticker (a sticker with lots of 3 character codes on it) in the glove box, you can look here to decode them:
http://lonestarthunder.com/m_rpo.php

This will tell you what drivetrain options, axle ratios, seat styles, radio type, pretty much everything.

BenK

SF BayArea

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Posted: 05/31/12 09:21pm Link  |  Print  |  Notify Moderator

clicky to Wikipedia GM 4L80E tranny info

Gear ratios



2.48 First
1.48 Second
1.00 Third
0.75 Fourth, OD
2.07 Reverse


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

Gale Hawkins

Murray, KY

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Posted: 05/31/12 09:31pm Link  |  Print  |  Notify Moderator

We have that one in our MH and they are good transmissions. I would recommend a bucket flush using 14 quarts of Dexron VI from WM or better. On some Escalade forum there is a good right up with pictures. Two summers ago we did both the Blazer and Escalade one Sunday afternoon. Pans were dropped the time before.

Turnkey Brent

Nokomis, IL

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Posted: 05/31/12 10:14pm Link  |  Print  |  Notify Moderator

Thanks ya'll, dont know much about the 4L80E, but everything else on this burb was exactly what we wanted and looking at it and driving it ya can't tell it's not a new vehicle. I am really looking forward to towing with it.

APT

SE Michigan

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Posted: 06/01/12 07:47am Link  |  Print  |  Notify Moderator

CKNEK wrote:

The 8.1L in the pickups came with the Allison. The Burbs got the 4L85E.


Yep.

Congratulations! I looked for about a year to find a 03-06 8.1L/4.10 low mileage Burb in good condition. Only found a handful across the country I would have purchased, but ended up getting a new one. It's a great TV! Not many problems to worry about. Replace the receiver it is is the OEM one.

I think the 4L85E came in 2003+, a bit stronger than the 4L80E.

* This post was edited 06/01/12 09:09am by APT *


A & A parents of DD 2005, DS1 2007, DS2 2009
2011 Suburban 2500 6.0L 3.73 pulling 2011 Heartland North Trail 28BRS
2012 VW Passat TDI

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