Auto to manual trans swap

redneck tom · 05-19-2007, 08:57 PM

i would like a 6 speed manual in my 03 GMC and my question is how hard would it be to swap out the allison for the 6 speed? does the ECU need to be changed and what modifications would need to be done to make it work?
Tom

**Diesel Nut** · 05-19-2007, 10:35 PM

Let me look into this for you a bit. I think the ECM should be the same, maybe a reflash to program it as a stick. You have a transmission yet?

redneck tom · 05-19-2007, 10:38 PM

not yet im looking for a wrecked one or might look into see how much one new is.
Tom

**05_LLY** · 05-19-2007, 10:40 PM

Quote:

Originally Posted by redneck tom

not yet im looking for a wrecked one or might look into see how much one new is.
Tom

There is a new one on ebay for sale!!!

**05_LLY** · 05-19-2007, 10:43 PM

EFi live should take care of everything as long as you could hook up the reverse switch and thetransfer case stuff using the same wiring harness, if not you would have to change the harness, other than that jus the clutch peddle assambley and a simple ecm reflash!!!

redneck tom · 05-19-2007, 11:28 PM

thanks how do i get a hold of efi live

**05_LLY** · 05-19-2007, 11:38 PM

its tuning software that anyone can buy, PM diesel nut to see if he carrys it. If not i can hook ya up with a efi seller!!

MAXitOUT · 05-20-2007, 02:04 PM

Hey i was just wondering why you would want to get rid of the best Auto Trans made and go with a manual?? not being rude or anything, i would just like to know your reason..

redneck tom · 05-21-2007, 07:08 AM

im just not a fan of auto's because i will kill them and dont get me wrong i love allison but its an auto and i will kill it so i found an article on the manual it said that this is the same 6 speed that is run in the powerstroke is that accurate?

myojunk · 05-21-2007, 04:57 PM

Quote:

Originally Posted by redneck tom

im just not a fan of auto's because i will kill them and dont get me wrong i love allison but its an auto and i will kill it so i found an article on the manual it said that this is the same 6 speed that is run in the powerstroke is that accurate?

they have the same shift pattern. im not sure about ratios as such. the shift towers are different along the shifter itself. im pretty sure the bellhousing is different between the two as well. in other words, dont look for a powerstoke zf to swap into the dmax...