85MikeTPI

iTrader: (9)

Glad you found it helpful. My SSR hybrid T56 is motoring along in my L99/LS3 '92 Vette swap.

PadreSmith

iTrader: (24)

I got a lead on a 2006 corvette trans for sale. If I understand correctly a z06 t56 has the triple/double synchro mm6 gears with the one piece countershaft that will fit into a ssr tailhousing. Without buying the trans and taking it apart How can I tell if it is the mm6 gear set with the one piece countershaft? My logic is to buy this trans for the gears/countershaft, put them on a ssr mainshaft, then use the ssr tailhousing on my gto case, and create the ultimate homebuilt t56. Sound about right?

85MikeTPI

iTrader: (9)

Externally, the C6-Z06 T56 will have a larger 30spline output shaft instead of the normal 27spline vette output. If you post the part numbers up in another post, there are others that can verify them also.

maroonls1z

I am working on doing my own hybrid for a ls7 f-body and i was wondering if the tr6060 syncros can be used in a t56.

85MikeTPI

iTrader: (9)

No. With the exception of a few small clips, spacers, and misc back half parts, nothing internal is compatible between the T56 and TR6060.

maroonls1z

ok, but i can use the syncos from the m12 correct?

c6silver

I have a 98C5 T56 that I want to use behind an LS1 making 425 flywheel HP in a 56 Chevy with C4 suspension and brakes etc...what parts do I need to convert from transaxle to transmission for this application ? Thanks in advance guys !

85MikeTPI

iTrader: (9)

Look through the PDF write up in this thread and search this forum for the dozens of other C5 T56 conversion threads for help. If you still have specific questions, it would be wise to open a new thread unless you're building a 32-spline hybrid with your C5 and have questions not covered here.

99WS6_

iTrader: (1)

So just to confirm I cannot use the t56 in my 99 Fbody I have to get a one of the other trans options that are on the PDF. How did the trans hold up?

85MikeTPI

iTrader: (9)

You can't put the fbody gears on the 32-spline mainshaft, if that's the question.

My 32-spline is still going strong in my LS3 C4 vette, I never give it a second thought.

99WS6_

iTrader: (1)

I understand know. I was asking more of if I can use the t56 housing off my Fbody, but I'm guessing we can but we use the donors gears? Correct

jmd

iTrader: (4)

Short: Yes. Long:
The bearing races, splines and other machined features of the mainshaft and countershaft extension require matching synchros and gears, yes.

Examples:
A GTO, Vette, CTS-V countershaft extension requires the 5th / 6th from one of those with double-cone synchronizers and matching gears.

A 06-07 Z06 1-piece countershaft requires the 5th / 6th from one of those because the i.d. of 5th / 6th are reversed.

An F-body, Cobra, Viper countershaft extension requires the 5th / 6th for one of those with single-cone synchronizers and matching gears.

Example: I have a finished GTO 32 spline build. It was a core I bought without the rear components. So I used a Vette core countershaft extension.

The mainshafts are similarly divided; a triple/double cone mainshaft (GTO, Vette, CTS-V, SSR) requires gears from the same. A double/single cone mainshaft (Viper, F-body, Cobra) requires gears from the same.

The only exception is the 5-6 cluster driven gear on the mainshaft.

With this info, now you can read the PDF and the mainshaft pictures show differences that are the reason why the above is true.

Mike454SS

iTrader: (4)

Correct, but if you want the same ratios that the F-Body had, you can use 2006/2007 ZO6 gears.

91bird_vortech

Thanks for the write up. I have an 2006 LS7 t56 on the way and will be using the SSR mainshaft/tailhousing option.

Being this will be my first transmission build. What assembly/specs/guide would you recommend to rebuild the transmission?

I see some places online offer hand fitting the sliders and hubs. Where can I find more detail on this operation? I assume this is supposed to make the transmission shift better. What other handfitting can be done to make the trans shift better?

I have no donor other than the LS7 T56 and will need to change the shifter linkage. Do you have more detail on what needs to be chagned over or is that apparent from the rebuild guide?

I've seen a couple pictures of viper T56 transmissions on google search that have a billet mid plate with machining where needed for hydraulics. Does anyone know about these plates?

jmd

iTrader: (4)

You need to download and follow the Tremec rebuild manual; readily downloadable online. It's geared towards the slip-yoke variants (Viper / Camaro) with double/single synchros so you'll need to pay attention to the disassembly of the triple/double cone components of the donor Vette T56.

Assuming the Hybrid PDF Mike wrote doesn't tell you enough about the reassembly of the unit as a slip-yoke variant, or this being your first build leaves you in the dark, walk through other how-to rebuilds; there are a few if you search.

McLeod has made a few front plates. What benefit you'd see with one versus a GTO one, I couldn't tell you.

Number1

iTrader: (1)

Anyone try something like this on the corvette tr6060 transmissions yet???? Also what's the difference between the mm6 & mm12 on a c5 or c6, besides the 1pc countershaft.

huff

iTrader: (1)

If I am using the SSR tail housing and want to use a 1 piece countershaft do I need to order TUEN4961 & TUEN4962 if I ordered GM 89060072 1pc Countershaft w/mm6 gear set? Parts numbers were taken from Mike's write up.

Thanks Mike for the great write up!

85MikeTPI

iTrader: (9)

Yes, you'll need new 5th and 6th drive gears because they have different ID dimensions to slide onto the 1pc countershaft in the opposite order as they would on a 2pc.

You need 1each of all the parts in that last section of the write up for a 1pc conversion, but you can reuse the 5/6 synchro from the 2pc donor if good.

Hardcoresoldier

iTrader: (2)

is there any need to look at upgrading the input shaft of a GTO? I haven't seen anything mentioned about upgrading any of the input shafts so I was curious....

85MikeTPI

iTrader: (9)

Anything can break, but the TQ multiplication happens at the output.