XJS V12 Manual Conversion & ITB's & Maybe TWR Rep
Discussion
HeWhoDaresRoy said:
I've got the Getrag from a 3.6 in my v12, along with the 3.54 diff from a 3.6. The gearbox seems to handle the torque fine, but if I was doing it from fresh, I'd be tempted to find a 6-speed.
See this is funny, I've got the two Getrag units in two of my V12s (both similar but reverse in different places), and if I was building an XJ or another XJ-S I'd be tempted to try and four speed (if it was an early XJ-S or an S1/S2 XJ), just because I like that box in the e-type S3. It would be nice to find a nice, sharp four or five speed as both the standard ones can be a bit long. There is a very modified 4.2 XJ S3 using a Nissan gearbox that is apparently pretty good.A four speed appeals for that period correctness and being a B-road car, but as more of a tourer a five speed can be very welcome.
Just reading about what torque these gearbox’s can take. Getrag from the xj’s is apparently a stronger box than the t5 but the getrag is rated at the same max torque as a Land Rover LT77. I thought the t5 was the stronger gearbox for torque. Not sure about manual gearbox bell housing though to fit a jag v12.
I have a Jaguar version of the 5 speed LT77 on my 4.2 straight 6. Much lighter gear change than the t5 on my TVR which is fitted to basically a 300ft/lb engine. Would an LT77 simply bolt to a v12 manual bell housing without an adapter plate? Nice Jaguar gearchange then, 5th gear is the same ratio as if an overdrive is fitted to the Jaguar 4 speed
I have a Jaguar version of the 5 speed LT77 on my 4.2 straight 6. Much lighter gear change than the t5 on my TVR which is fitted to basically a 300ft/lb engine. Would an LT77 simply bolt to a v12 manual bell housing without an adapter plate? Nice Jaguar gearchange then, 5th gear is the same ratio as if an overdrive is fitted to the Jaguar 4 speed
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
I thought the number used in different getrag gearbox’s related to its max torque?RobXjcoupe said:
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
I thought the number used in different getrag gearbox’s related to its max torque?craigjm said:
RobXjcoupe said:
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
I thought the number used in different getrag gearbox’s related to its max torque?
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
Every day's a school day here on Pistonheads! Makes sense and all very Germanic, but why would the 265 be stronger than the 280? Now that doesn't feel quite so logical... DP33 said:
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
Every day's a school day here on Pistonheads! Makes sense and all very Germanic, but why would the 265 be stronger than the 280? Now that doesn't feel quite so logical... DP33 said:
Every day's a school day here on Pistonheads! Makes sense and all very Germanic, but why would the 265 be stronger than the 280? Now that doesn't feel quite so logical...
I'm going to guess that it was designed to be a stronger transmission but it did not work out that way. When I bought my E24 M635csi, 2nd gear was completely non functional. I replaced it with another 280 which has weak syncro's in 3rd. I asked around the M crowd (which I'm not part of as I'm more a Mercedes Benz guy) and was told time and again that the 280 has known issues, and what people do when theirs fail is retrofit a 265. 265's are becoming very hard to find these days in the US because these guys are now hoarding them.craigjm said:
DP33 said:
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
Every day's a school day here on Pistonheads! Makes sense and all very Germanic, but why would the 265 be stronger than the 280? Now that doesn't feel quite so logical... I owned a manual XJ-SC for a while. Bought as a non runner and got it running. It was a nice drive. Very different to the automatic. The shifter bushings were completely shot so shifting was super sloppy but as I was not interested in keeping it, I sold it on as a project. it left it's home in Texas in December and made its way to Amsterdam. Someone must really rust free XJ-SC's with manual gearbox there.
DP33 said:
craigjm said:
DP33 said:
alabbasi said:
The Getrag 265 is a pretty stout box. It's used in several BMW's and a retrofit to the E24 M6 and E28 M5 as the Getrag 280 that was standard in those cars is so weak by comparison. It was also used by AMG and put behind large v8's in the 80's, when they were an independent company.
Every day's a school day here on Pistonheads! Makes sense and all very Germanic, but why would the 265 be stronger than the 280? Now that doesn't feel quite so logical... About 15 years ago, I was a member of the Essex region jec. There was another member with a bright red v12 xjc with the later 6.0 engine fitted and a manual getrag gearbox conversion. I remember chatting thinking nice conversion but he admitted he was on the second gearbox and it was weak for the engine and should of gone with the tremec conversion instead. I can’t remember what specific getrag box he was using though.
Edited by RobXjcoupe on Thursday 4th June 23:02
I am just about to convert my V12 XJS from 3 speed auto to 5 speed Getrag 265. I was very fortunate to find a NOS box with a special DJB bellhousing and a new Rob Beere flywheel. This enables the conversion without using any conversion kit. I was ready to buy a conversion kit using an old recycled gearbox with who knows what mileage on it until I stumbled over this new one. I am using Tom Lenthall in Wokingham to do the work. It should be finished in a couple of weeks I will post a review once finished.
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