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4l80 transmission

Fon johnson

04 2500 hd
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Gallipolis ohio
Does any body know what it will take to put a 4l80 transmission and tcase out of a 98 gmc in to a 2005 chevy 2500hd im a little concerned with the tow houl button the 98 dosint have 1 and the 05 does any suggestions b4 i jump into this
 

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FRANKENBURBAN
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The trans will bolt in with the exception of the 12 o clock mounting bolt. Tow/haul mode is just a separate shift table that is switchable. As to the transfer case, that is probably a different story.
 

Fon johnson

04 2500 hd
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So will the transfercase out of the 05 work with the transmission out of the 98 i have both and both are push button i bought the 98 it has 15000 original miles but no title the guy passed away and its ashame bc this truck dont have a bubbel in the paint no where i was going to swap moter in all it's the 454 but im more of a 6.0 guy myself so im just going use the transmission i just need to figer out what all is going to couse me problems b4 i start im trying to keep this a 1 day job
 

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FRANKENBURBAN
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The 05 transfer case will bolt right up. The 4l80e will also bolt up, but you'll only have 5 bolts instead of 6. You'll have to de-burr the shift shaft's and swap the NSBU's, check the trans cooler fittings, but I believe both have the same threads into the case. Just keep in mind if you need parts you have a 98 as the harness and EPC solenoid changed in 04. The big hurdle will be the torque converter. The 454 converter is WAY to low a stall for the 6.0l, and if your other trans has many miles you do not want to re-use that converter. Also keep in mind to NOT use dex 6 fluid as the seals in the 98 are incompatible with it. If it was mine I would stick with your 05's trans and have it rebuilt. A trans that has sat for a long time most likely has hardened seals in it. Not to mention the 98 will not have the better high energy clutches in it.
 
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