Manual Transmission Conversion

Drivetrain discussion including Transmission, Differential, Driveshaft, and related items.
kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Manual Transmission Conversion

Post by kras007 » Thu Mar 02, 2017 4:15 am

Just finished a manual transmission conversion on a 2012 9C1. Photos to follow
Here are some details on the build

Parts:
2009 GXP- Transmission mount, crossmember, shifter assembly, engine/transmission harness, clutch position sensor jumper harness, clutch slave cylinder
2012 Camaro- clutch pedal assembly and transmission
LS7- Clutch, flywheel, and pressure plate
WAM Custom BCM Program
Custom ECM tune

Procedure:
Separate and lift body from powertrain. Send out ECM and BCM for custom tuning. Remove factory engine/trans harness. Remove automatic trans and remove engine from front cradle. Remove cylinder heads and perform DOD delete on engine and install camshaft, valve springs, and headers.
Bolt on LS7 Clutch and Tremec 6spd transmission from 2012 Camaro.
While body is lifted off of powertrain brake booster was removed and drilled hole in firewall for clutch slave cylinder. This required removing parking brake foot pedal assembly and bracket that was welded to I/P and firewall. Camaro clutch pedal assembly could then be bolted in place.
Lower body back onto powertrain. Transmission shifter lined up and bolted in place where factory automatic shifter was installed. Modified automatic transmission cooler lines to adapt to manual transmission so factory transmission cooler could still be used.
Spent hours reviewing GXP and Caprice wiring schematics to determine modifications that were necessary to factory Caprice body side harness. Most modifications were adding in circuits that were missing from factory harness. These were done using factory terminals and installed into factor connectors. Also the Caprice PPV has a heavy duty engine cooling fan system completely different from a GXP and requires circuits removed from undressed fuse panel and adapted to PPV cooling fan system. After all wiring modifications were made I was able to perform clutch pedal position learn, brake pedal position learn, etc. Vehicle started up and I was able to resolve all warning lights. Currently it has no warning lights illuminated. Vehicle has been test driven and it is awesome! All work was done meticulously and when looking over the vehicle it would appear it rolled off the assembly line with a manual transmission. Only thing left to do is dyno tune the the ECM program and install a G8 console to finish it off so it has a hand applied parking brake.
It has been a great project and I can't wait to build another one. Who wants one!

jackleg
Posts: 99
Joined: Thu May 05, 2016 2:25 am
Location: SW MI

Re: Manual Transmission Conversion

Post by jackleg » Thu Mar 02, 2017 2:04 pm

That's awesome! I want one.
2011 9C1 6.0
RCR "Little Lunati" 219/223 .625/.625 112+0
Kooks headers, hi flow cats, Dynomax Super Turbos
Flex fuel tune

kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Re: Manual Transmission Conversion

Post by kras007 » Thu Mar 02, 2017 6:54 pm

Pics
Attachments
IMG_1885.JPG
IMG_1885.JPG (1.78 MiB) Viewed 9367 times
IMG_1885.JPG
IMG_1885.JPG (1.78 MiB) Viewed 9367 times

kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Re: Manual Transmission Conversion

Post by kras007 » Thu Mar 02, 2017 6:57 pm

Pic
Attachments
IMG_1924.JPG
IMG_1924.JPG (1.94 MiB) Viewed 9366 times

kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Re: Manual Transmission Conversion

Post by kras007 » Thu Mar 02, 2017 7:03 pm

Pic
Attachments
IMG_2008.JPG
IMG_2008.JPG (869.33 KiB) Viewed 9364 times

kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Re: Manual Transmission Conversion

Post by kras007 » Thu Mar 02, 2017 7:05 pm

Pic
Attachments
IMG_2118.JPG
IMG_2118.JPG (1.5 MiB) Viewed 9364 times

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elc32955
System Manager
Posts: 1788
Joined: Thu Nov 29, 2012 4:32 pm
Location: East Central Florida
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Re: Manual Transmission Conversion

Post by elc32955 » Thu Mar 02, 2017 7:19 pm

Here's some more pics, posted on behalf of the OP.
mt1.jpg
mt1.jpg (28.74 KiB) Viewed 9361 times
mt2.jpg
mt2.jpg (30.99 KiB) Viewed 9361 times
mt3.jpg
mt3.jpg (31.47 KiB) Viewed 9361 times
mt4.jpg
mt4.jpg (21.77 KiB) Viewed 9361 times
mt5.jpg
mt5.jpg (29.64 KiB) Viewed 9361 times
Eric
System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.

Gerome
Posts: 322
Joined: Mon Jan 20, 2014 1:07 am

Re: Manual Transmission Conversion

Post by Gerome » Sat Mar 04, 2017 8:13 pm

This is too cool ! I can see a lot of 9c1's becoming manuals . Great info also . Did you get the harness used or from the dealer ?

kras007
Posts: 27
Joined: Sun Feb 26, 2017 6:54 am

Re: Manual Transmission Conversion

Post by kras007 » Sun Mar 05, 2017 12:48 pm

Engine/Transmission harness was purchased New through GM. The G8 harness connects to same body side connector that the original engine/auto trans harness used.

Navy Lifer
Administration Staff
Posts: 1488
Joined: Tue Mar 19, 2013 11:30 pm
Location: Canton GA

Re: Manual Transmission Conversion

Post by Navy Lifer » Sun Mar 05, 2017 4:03 pm

What about the rear axle ratio--any plan to change it?

6-speed manual in GXP & SS sedan uses 3.70 ratio, and the stock PPV 2.92 is leaving lots of performance potential on the table...or, maybe you've already changed the rear axle?

Very cool thing to do--can't imagine the cost!

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