Hi, I've just bought a Ferrari 456 GT Maual car which has an issue with the gear box (Issue was know when I bought the car). I've had the gear box stripped and a list of parts I need (£1500). My question to you guys is I've been offered a 2000 yr 456 Manual "M" gearbox. , could people let me know if I can put into a non "M" car (1995) a "M" (2000) gearbox? Is it compatible? Thanks in advance Nick
But waht seems to be the issue with the gearbox anyway? Second question: the M, aside from the looks, where different people have different opinions, is an improved version of the GT, why would you want to "fix" the GT instead of using the M?
1500 pounds is not a lot for the parts. That way you have replaced everything that wears, and in fact the syncros and bearings do wear. I would go with the rebuild rather than swap. Used boxes sell for about $3500.
There were three different versions of the 456 GT transaxle and two different versions of the 456M transaxle, with upgrades incorporated into all of those versions. All have the same front covers and use the same axles and early versions of the 456M used the same torque tube, so the transaxles should be interchangeable. The 456M transaxle changed very early in 456M production at transaxle number 100, so the used one is likely the latest version. Without going through every part in detail, it looks like the 456M tranaxle may offer some useful upgrades over the original 456 GT unit if the price is reasonable. You can go through the parts catalog to see what was upgraded, but it looks like bushings and other wear parts. http://www.ricambiamerica.com/parts_catalogs.php?M=FE&P=&V=diag&I=797
Thank you guys for the quick response. It sounds to me like it will be much cheaper to upgrade to a 456 gt M gearbox. Still nervousness it had different mounts or connections or something which will cost more to adapt??? My car was used by some kids at a car wash before I bought it. I bought it with a noisy gearbox. Had the gearbox stripped and it needs bearing and read gear and idle gear. Expensive little parts! It might be cheaper to buy a 456 gt M box instead of the new parts and cost of the rebuild and by the sounds will just slot back in. Is there anyway I will know without just buying and trying? I do respect your advice so will probably go with the upgrade. Hopefully then able to sell my gearbox for spares to get some money back. Thanks again Nick
Ok Ive done some more research on parts now in common with the 456 GT and 456 GTM gear box to connect to the rest of the car ..see below. Diagram reference Part number GT Gearbox and Insulation: Page 037 2 456 GT - PROPELLER SHAFT 154501 Gearbox and Insulation: Page 037 5 ENGINE GEARBOX CONNECTING PIPE 154397 Diagram reference Part number GT M Gearbox and Insulation: Page 040 2 456 GT - PROPELLER SHAFT 154501 Gearbox and Insulation: Page 040 5 ENGINE GEARBOX CONNECTING PIPE 175106 The input shaft (Propeller shaft) into the torque tube (ENGINE GEARBOX CONNECTING PIPE) has the same part number for the 456 GT, 456 GTA, 456 GT M and 456 GTA M. (tick) The other part number I looked at was the torque tube (ENGINE GEARBOX CONNECTING PIPE) but this appears to be a different part number for the 456 GT and the 456 GT M. Does anyone know what the difference is? My logical head says in the input shaft (Propeller shaft) is the same then this should be able to link into a GT torque tube (ENGINE GEARBOX CONNECTING PIPE) or a GT M torque tube (ENGINE GEARBOX CONNECTING PIPE). Any views? Thanks Nick
Nick- Early 456Ms used the same torque tube as the 456 GT and then it was updated at transmission 101. The torque tube propeller shaft and matching driving gear for the transaxle changed, so it would be a good idea to make sure the old propeller shaft matches the new transaxle driving gear. The new propeller shaft fits into the old torque tube, but that part is very expensive. Might be worthwhile asking if they would throw in the new torque tube with the 456M transaxle. Not much call for a torque tube as a used part.
Just done some reviewing of the gearbox propeller shaft. On the M this is at an angle hence why there is a different torque tube on an M car. This means you can't use an M gearbox on an old non M torque tube. Thanks for all the advice. I've now got hold of all the part and the gearbox re-build is going on as we speak. Thanks Nick
