TurboGibbs

iTrader: (6)

My stock 2wd 5 speed crossmember worked with no modifications.

JakeBrakeIH

iTrader: (22)

hmm thats good to know...ill just call the dealership and see if they have different part numbers...thanks!

Rafedial

iTrader: (7)

For anyone using a GTO M12 T56 in their NBS Silverado 1500 you will need to us the F-body shifter to make it come through the center console correctly. To use the F-body shifter you will need to replace the GTO "shifter cup" with an F-body one..

Here is some info...
"All you've got to do is knock that little roll pin out of the shifter cup where its meets the shift rail and replace it with one from an fbody. The fbody one puts the shifter back up where you want it. If you don't have a spare shifter cup I think you can get a new one for $25-35."

Parts needed to put an F-body shifter on a GTO trans:
The Tremec number is:
Shifter offset lever 1386-098-016

I had to grab a spare from thegearbox.org for about $27

You'll probably need the bushing also, 1352-127-009

OR CALL.....
The only place I know of to get one, right off the top of my head, is six speeds inc but they're hard to get ahold of at the moment due to the hurricane. If you look through these threads you can find the owner's cell phone number and contact them.

Here's a thread that shows the differences between the fbody and gto shifter cup.

https://ls1tech.com/forums/showth...ht=cup+shifter

Rafedial

iTrader: (7)

I know it has been posted before but,
here are ALL the part numbers I used to complete my swap in my '04 Silverado Z71 including PRICE LIST. I just copied my build sheet if your wondering...

2002 Chevrolet Silverado 5 Speed Manual Transmission Cross member, GM Parts Direct #15748078 Price: $95.97
2005 GTO Transmission: $????
2004 Chevrolet Silverado 2WD Front Wheel Bearing Hubs (Compatible with spindles) (X2): Price: $220.00
2004 Silverado Clutch Pedal Assembly (bolt-in, narrow brake) (+2 pedal pads), GM clutch pedal part #15027983, pads #15706041 Price: $50.00
2004 Silverado Clutch Pedal Bracket, GM Part #15713209 Price: $5.00
2004 Silverado Clutch Master Cylinder Gm Part #24235619 Price: $100.00
Pilot Bearing (roller version), GM Parts Direct Part #14061685 Price: $11.00
2004 Silverado ECSB 2wd 2 piece driveshaft (Ebay): $240.00
LS7 Clutch #24238412 GM Parts Direct Price: $240.00
Pressure Plate Bolts GM #11516862: $2.11 (X8)
Carrier Bearing Driveshaft Mount, ME Price: FREE
2 3/8” Hole Saw (for clutch master install): $25.00
Mobil 1 ATF Dextron III: $30.00 (X5 qts.)
2002 Camaro LS1 Clutch Slave Cylinder+Throwout Bearing/Spring GM Part #15046288 Price: $115.00
Hurst F-body Shifter=**** Price: $110.00
T56 Tuning Me Price: FREE (just turn off all Auto Trans DTCs and copy F-body/GTO Speedo calibration settings)
2005 GTO Starter GM Part #92169668 Price: $250.00 no core
LS2 Flywheel GM Part#12571611 Price: $200.00
You will need clutch master line from a ’04 Silverado 5-speed: Part # I forget

I am 100% positive this is everything I needed. If you start with a 4L60E 2wd, then you can use your driveshaft (4L60E and T56 yokes are identical)

Some parts are I bought specifically because I used a GTO trans, they should all be italicized.

Hopefully this consolidates all the info in the previous pages....PM me if you have any Questions.

Cody

Rafedial

iTrader: (7)

Forgot to mention....I have not done the wiring yet but you can get away with leaving the "black box" on the side of your 4L60E plugged in and plug your VSS (two wire plug) from the 60E into the tail housing of the T56 to have your speedo work... Here is a link to the wiring diagram if you want to have reverse lights and do the rest of the wiring...Hope all this info helps because it took me a LONG TIME to find it all...

4L60E to T56 wiring diagram link....
https://www.performancetrucks.net/fo...wiring+diagram

Note: I am not sure if it is right, or right for all NBS trucks because I personally haven't tried it...yet

7845

iTrader: (1)

word to wise. the stock pedal assembly is a bad design. if you put any type of stiff clutch in your truck. you will push your master thru the firewall. this is my 2nd pedal that just broke. i had to be towed home cause the square hole busted out. bfore you do this swap reinforce the opening or else stock up in these pedal assmeblys

04GIBBS

iTrader: (11)

I only had that issue at the race track and it sucked, but I have not seen it since not trying to **** the hell of it.

shakinlm7

iTrader: (5)

^^ +1 ^^

Here are some pics of what did so solve the problem

cccharged

Why did you go with a GtO starter? im putting a t56 out of a gto in my truck that was factory five speed...was the starter teeth different or what?

Rafedial

iTrader: (7)

I went with the GTO starter because the GTO bellhousing has a smaller diameter opening for the starter. The GTO starter is is smaller to accomodate the smaller opening. You have to use a GTO starter if using a GTO M12 Trans.

There is no difference in tooth count for any LS1/LS2/LS7 flywheel and all the starters also have the same tooth count.