Another decision I have already made is that I will be using an LS3 but as an engine and gearbox combination from new will set me back around £12k I've been exploring the possibility of a second hand unit.
LS3s are used in a myriad of American Muscle cars and a fairly readily available in the US, but after paying a minimum of $9k + shipping + import duty + VAT it's not that viable so I've ruled that out. As far as I know the only UK sold car to come with an LS3 is the Vauxhall VXR8 which aren't exactly ten a penny, so finding a pullout is tricky, but I think I've succeeded.
There's a guy called Gary who runs a site called www.LSXV8.co.uk and is about the only UK breaker of Monaro's and VXR8s. I got in touch and was surprised to hear that he had a low mileage (28k) 2009 LS3 with 6 speed manual available which has everything except ECU and loom, lovely.
Whilst I wait for him to put it back in a car so I can see/hear it run my thoughts turn to the gearbox and it's many guises. He tells me it's a T56, however there seems to be about a million different variants with a million more gear ratio combinations and shifter locations, so I delve deeper....
After many hours/days of trawling Google and various forums, I 'think' it is either a TUET-2066 (T56), TEUT-2100 (T56) or TUET-10310 (TR6060) but am still waiting back from Gary to confirm the correct part number. In the meantime I have created a spreadsheet to compare the above three options and the T56 Magnum which GD use.
|Tremec Transmission Comparison - Speed|
The TUET10310 is said to be much more reliable a less agricultural than the standard T56 so this would be my preference if it turns out that is what is currently attached to the engine, however both the T56 and TR6060 in a VXR8 would have a remote shifter so this would need to be repositioned. Worst case I may end up having to get just the engine and sourcing a new T56 Magnum.
The spreadsheet automatically calculates everything by changing the ratios, RPMs or wheel and tyre sizes. If anybody out there wants a copy let me know.