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Hello just purchased an envoy and I'm looking for a replacement transmission, found a 4l60e transmission locally and have started to decode the transmission tag. So far from the information in the code and the seller it's from a 2008 GMC Sierra 5.3L 4wd with a transmission code 8LND. There seems to be a lot of variants of this transmission and I'd like to know what transmissions will fit and what would need to be swapped as in bellhousings or anything else. Was unable to verify what LND code is from other than listings for 1500 transmissions come up.
 

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2003 chevy trailblazer_ls
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The 08 has an input speed sensor the 03 does not have and the wiring will be different.
 

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Discussion Starter #3
Found a 2006 trailblazer transmission, not sure about fitment on the 03 envoy. Haven't found anything online.
 

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Still not sure if the Silverado 4l60e will work after changing the bellhousing. There's gotta be some info out there, a write up or something.
 

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Still not sure if the Silverado 4l60e will work after changing the bellhousing. There's gotta be some info out there, a write up or something.
The 2006 will not work as is, because it has an input speed sensor, thus internal wiring and plug pins are different. You can swap out your internal wiring harness from the trailblazer to the 06 transmission. Simply ignore the input speed sensor inside. You may also need to swap the pressure control solenoid as the plug connection may be different depending on production year of your 03. Then swap out the bell housings.

There is a special torx tool for these bolts that must be used. Don't use a regular torx or you can strip the head of the bolt then you will need to drill the head off the bolt.. Not fun..

Also, very important, if you have the 4.2L engine, there is a change to the torque converter. The mounting pads are thicker causing it to go into the pump further. This change was due to the converter hub pulling out of the pump rotor just enough and breaking the pump under hard acceleration. Look up a company called Whatever it Takes transmission, they have locations all over the country and have the converter. The 4.2L converter part number is DGM135 or BU51 depending on brand carried.

If it's a 5.3L, no worries..

The torx bit can be purchased on E-Bay for around $13.00 (Whatever it takes may also have the torx.)
Sonnax Torx Plus Bit For 4L60E 4L65E Bell Housing Bolts Heavy Duty (T-1550)

Hope this helps..
 

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2005 trailblazer_lt
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There is a special torx tool for these bolts that must be used. Don't use a regular torx or you can strip the head of the bolt then you will need to drill the head off the bolt.. Not fun..
Good advise here...... I've had 2 tranny pumps fail while driving on the highway due to a busted pump rotor.

:cool:
 
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