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I have a GTO T56 that I just took apart after it was grinding 3rd and difficult in 4th. I have a brand new 3-4 synchro, a new 3rd gear, and new 3-4 blockers for it, as well as a complete set of bronze fork pads and billet 3-4 synchro keys. Remaining blockers were tested ok on it.
I haven't reassembled the unit yet, so if anyone's interested in it as it sits apart, or adding additional parts to it (billet 5-6 ?), let me know.
The GTO T56 is externally identical to the LS1 T56 and can be used in any application the LS1 unit can. The GTO has a MN12 gear set which is lower and suited for heavier vehicles. The 2005 GTO T56 has more modern internal components than the LS1 version, allowing faster/smoother shifts and comes stock with solid 1-2 synchro keys and a steel 3-4 shift fork. The double/triple cone synchros provide upto an additional 50% more friction area for the shifting synchronization.
Adding an adaptor plate will allow it to mount to and existing muncie/T5/saginaw bellhousing/clutch setup. Or it can be used directly behind an LSx swap.
$1600 as it sits with new and performance parts.. $1800 if I reassemble it with performance shimming. Shipping is about $130, or can meet up with anyone within 50mi of 19711 zip..
I am interested but I need to make it work with an 87 formula with T5.
Whart parts and mods are needed or do you know a link with this info.
Thanks,
Lou
I am interested but I need to make it work with an 87 formula with T5.
Whart parts and mods are needed or do you know a link with this info.
Thanks,
Lou
The two differences in doing this with a LS1/GTO trans, is that
the shifter will sit back 2" from the T5 and will need to be adapted
with a plate to relocate the handle back forward, and no mechanical
speedo hook is available unless you have someone like "alloy" here
on thirdgen.org machine the tailhousing for you.
The one major advantage of the LS1/GTO trans over the Aftermarket
unit, is the power rating of the LS1/GTO units are 450+ lb-ft (and
upgradeable to 700+) , over the 400 of the Aftermarket units.
Thanks for the info. The LS1 conversion looks like it would require quite a bit more than buying the Tremec or Richmond T56 units specifically built for T5 replacement.
Thanks for the info. The LS1 conversion looks like it would require quite a bit more than buying the Tremec or Richmond T56 units specifically built for T5 replacement.
Because of the speedo or the shifter? I don't understand what "quite a bit more" means since the article describes what you need to do for the Aftermarket Tremec T56. You need to do those changes no matter what T56 (or in general any aftermarket trans) you convert to. The LS1/GTO units are just cheaper/stronger and more available.
Thanks for the info. The LS1 conversion looks like it would require quite a bit more than buying the Tremec or Richmond T56 units specifically built for T5 replacement.
Because of the speedo or the shifter? I don't understand what "quite a bit more" means since the article describes what you need to do for the Aftermarket Tremec T56. You need to do those changes no matter what T56 (or in general any aftermarket trans) you convert to. The LS1/GTO units are just cheaper/stronger and more available.
