manual conversion

[BuildItYourSelf]

car: 2008 g8 gt

parts list: will update with changes.

- list and prices are from greg contact him for price changes -

The harness is not necessary, but if you don't buy it you will need to buy the connectors for the transmission and run them to the ECM, fuse box and also tie into the cabin harness.
Name, # Needed, Price
GXP Transmission 1 $2,679.87
Clutch jumper harness 1 $37.64
Clutch pedal assembly 1 $127.51
master cylinder res. & bracket 1 $7.77
master to slave pipe 1 $22.21
Clutch pedal cover 1 $16.77
M10 drive shaft 1 $358.60
M10 trans mount 1 $46.53
M10 trans support 1 $297.10
trans mount nut 1 $2.88
trans mount bolt 2 $5.89
trans mount adapter bolt 2 $3.06
trans cooler pipe 1 $78.97
M10 shifter control 1 $131.76
M10 shifter boot & knob 1 $51.23
shifter control mount pin 2 $8.10
shifter control lever pin 1 $2.39
lever pin retainer 1 $2.39
shifter boot bolt 2 $5.47
M10 brake pedal asm. 1 $53.64
brake pedal mounting bolt 2 $5.87
09.5 GXP engine trans harness 1 $342.16

you will also need:
A tune with a manual trans segment. (I used pat g via efi live autocal)
A modified bcm that will not look for the tcm (chris white has you covered there)
rear end with higher gears. the gxp has 3.70 im running 3.45
- I don't think you want to go lower the that unless you have the power to pull it and traction is an issue.
--I don't know the calculations right now but when I looked it up the 2.92 rear from a gt using a manual trans will run 90mph at 1200rpm or something like that. (may sound good but keep in mind at 1200rpm our engine probably only makes 60-100hp and is 4000lbs. you would down shift at every hill witch is pointless for a guy who is speeding) and first gear will redline at 60+mph or something crazy like that. it would run like a dog unless you have some crazy power to get it going. but you would get good gas mileage im sure.

(if someone finds the gear calculations please pm them to me and I will add it)

tips
first flash in you tune with holden trans segment
-if you don't you will be unable to flash because the ecm will not see the tcm and will not take the tune.
--to solve that problem hook up the auto harness to the ecm and body harness (plug behind the fuse box to include the big gray power plug) auto trans, and make a jump wire to all grounds on the harness, engine, body at battery ground and also the auto trans.

remove the brake booster completely along with the sound mats to cut the clutch master cylinder hole when your in there changing the auto brake pedal and adding the clutch pedal.

shifter bolts right in place of the auto shifter. place the shifter from underneath in the hole. put a bolt or 2 in to hold it in place then after you bolt the trans to the engine you can take them out drop the shifter assembly down and put the pins in the linkage. do all of this with loose engine mounts so you can lower the rear of the trans down to get your arms in there. then guide it in place when you lift the rear of the trans up and install the cross member.

----


to start i figured its best to remove the front end because i planned to pull the engine and trans out together.
from start to engine out time. 4hrs

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next i got the engine on the engine stand and took it apart to do the cam, springs and pushrods. time 1.5 hours
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after that i installed the m6 wiring harness then clutch then matted the trans. time 1.5 hours

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after that i wrapped the headers and dried them out and the paint and all that. put boots on the plug wires and went over the assembly checking stuff. time 3 hours. (wrapping headers takes a bit of time to do it right. mostly time during the water out for paint)

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next i installed the shifter. time 30mins
when you do this jump the old shift connector with a wirer. top middle to bottom left when looking at it with the clip down.

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then i would have did the clutch pedal but there was a problem.
the camaro is the only one that comes in an assembly. it works great tho. and a f-ton cheaper. and the plug is in the body harness ready to go. just plug it in.
sorry no pics.

next i installed the engine/trans in the car and hooked it all back in. time 4hours.

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then installed the drive shaft and started the exhaust work.


swaping it all over was very easy i did most the work alone.

big thanks to:
greg at pace for the parts and all the help
pat g for the help on the tune and tring to figure out the issues and sending new tunes in short notice.
chris white for fixing the bcm issue.
GRRRR8.net for meeting all you nice people who helped out in the project!!!

[Seattle09GT]

I have a chubby after reading this thread.

[rocket69GTP]

If u have the full M6 harness, do u have to cut and splice wires to make it work?

[BuildItYourSelf]

If u have the full M6 harness, do u have to cut and splice wires to make it work?

all plug and play. tho only thing that needs cut is the starter relay and crimp the circle eye connecter on.
that and get the ls3 oil sensor

[427g8gt]

How much for the swap

[BuildItYourSelf]

How much for the swap

around $5000 +clutch and flywheel just to get the trans in.
thats all new parts tho.

[Seattle09GT]

around $5000 +clutch and flywheel just to get the trans in.
thats all new parts tho.

So probably a lot less if you can find a donor Camaro SS that got wrapped around a phone pole.

[Posidon42]

No because that's what I tried to do. The trans is different enough to be a pita. Just get the new parts and be done with it. He and I are basically stick at the same point - trying to get the electronics working.

[travis gore]

thanks for sharing.

[G8GT721]

Which clutch did you go with?