T-56 Technical Data

[maxharvard]

I went to my old work (a Chevy dealership) and asked the guys to print me out some data on the T56. I thought i'd pass on the information, since a lot of guys seem to have the same question i did!

I have not yet put the T-56 in, but i figured if i had the same questions, i could certainly save a bunch of people the hassle of finding this out on their own.

[Ralph LoGrasso]

Good stuff, thanks. Thread stuck.

[RatMalibu]

just FYI the speedo connector part number has changed, its #88987993 now

and when you get the new connectors from GM the wires are not color coded, all wire is white

but here are the pin outs
Speedo connector #88987993
pin A = Ground
pin B = Signal

Reverse Lock Out #12101857
pin A = 12v Trigger
pin B = Ground

Backup Lamps #12085485
pin A = 12v Trigger
pin B = Ground

[Chad-1stGen]

How do you wire up the reverse lock out in an aftermarket situation? For example a 68 Camaro.

[RatMalibu]

I plan to wire mine in with the brake light switch i.e. foot on brake equals reverse lock out disenguaged

[Motown 454]

is there a way t owire it to the nutral saftey switch? not too good with wiring

[MarkM66]

just FYI the speedo connector part number has changed, its #88987993 now

and when you get the new connectors from GM the wires are not color coded, all wire is white

but here are the pin outs
Speedo connector #88987993
pin A = Ground
pin B = Signal

Reverse Lock Out #12101857
pin A = 12v Trigger
pin B = Ground

Backup Lamps #12085485
pin A = 12v Trigger
pin B = Ground

GM Parts Directs shows this for the Speedo Connector:

GM PART # 88987993
CATEGORY: Brake Master Cylinder Reservior Hardware

[jbirdcamaro]

Can Anybody Tell Me If You Can Take A 6 Speed Out From A Lt1 And Change The Bell Housing And The In Put Shaft And Put It Behind Als1

[chicane67]

It would be cheaper to purchase an LS1 trans... than to try and install the LT1 behind and LS.

[Mkelcy]

Can Anybody Tell Me If You Can Take A 6 Speed Out From A Lt1 And Change The Bell Housing And The In Put Shaft And Put It Behind Als1

If it's a 2.66 first gear LT1 T56, yes you can swap input shafts; and all of the LT1, LS1 and Viper T56s have the same transmission to bellhousing bolt patterns, so the bellhousings can be swapped too.

[elwaupo]

I know I need to change the flywheel to install into my 69 Camaro, but which one will work? The stock flywheel is an 11", but does it require a different flywheel? Thanks for the wiring information.

[80Camaro]

Elwaupo... I'll be using a factory 10.5" which is also pretty light at around 17 lbs.

[Mkelcy]

Here's a thread i started on Camaros.net that's got some useful information: http://www.camaros.net/forums/showthread.php?t=98387

[edl406]

The T-56
T-56_Service_Manual.pdf

If there is a better way to get this up for everyone to access, let me know how and Ill do it.

[John Wright]

The T-56
T-56_Service_Manual.pdf

If there is a better way to get this up for everyone to access, let me know how and Ill do it.

Thank you for the service manual;)

[TD509EFI]

If it's a 2.66 first gear LT1 T56, yes you can swap input shafts; and all of the LT1, LS1 and Viper T56s have the same transmission to bellhousing bolt patterns, so the bellhousings can be swapped too.

You will also have to swap out the trans to bellhousing adapter, along with the hydraulic master / slave assembly.

John

[Mark -G-]

Thanks, Mine is not shifting into gear well and when hot in competition mode (read lauching it) the clutch pedal sucks down to the floor w more rpms.

[Roberts68]

Original data links appear to be dead. Any chance that they could be revived?

[maxharvard]

I have them at my house robert ;) :D

[calimanv]

I have a t-56 out of my cts-v that needs a rebuild. how easy would it be to mount it up in a 68 firebird. it will be mated to a lq9. with I have to modify the tunnel to get it to fit? I can have it rebuilt and change the output housing to put the shifter where I want it. thanks in advance for any info..

Pete