03 Duramax swap - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

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post #1 of 5 (permalink) Old 10-07-2019, 12:10 PM Thread Starter
 
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03 Duramax swap

Will a transmission from a 2002 Duramax fit in a 2003 duramax. Both Trannys are the LB7 but before I buy one I’d like to confirm its a straight swap.
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post #2 of 5 (permalink) Old 10-07-2019, 12:28 PM
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I think they should if both are 5 spd, 06 was the change to 6 spd.

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post #3 of 5 (permalink) Old 10-07-2019, 12:36 PM Thread Starter
 
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Yeah both are 5 speeds. I read somewhere that there is differences but I also had people say there isn’t.
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post #4 of 5 (permalink) Old 10-07-2019, 02:13 PM
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The difference might be the something to do with programming . Id make sure they both plug in the same because I think 2003 was a different animal electronics wise . Also make sure the NSBU is the same .

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post #5 of 5 (permalink) Old 10-07-2019, 08:40 PM
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Same trans except cooler fittings might be different. There was a fitting change mid year. There are adapters to fit either way. Programming difference is total bullshit. Guess people want to post hearsay to sound smart.
If you can't prove your answer, stay the hell out guys.
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