The 'E' Type Forum

can anyone help with the conversion on to a 4.2 is the getrag a bmw box or a jag box are they the same just trying to sorce the bits

Hi French. ....have you tried using the search function on the forum. ..I just put in getrag conversion and got this...but there's more viewtopic.php?t=3045&highlight=gearbox+conversion Steve

frenchi wrote:can anyone help with the conversion on to a 4.2 is the getrag a bmw box or a jag box are they the same just trying to sorce the bits

I can provide an adapter plate to connect a Getrag to a Jag bell. You need to give waaay more detail about the spec of the car you hope to convert. A name and a sprinkling of punctuation wouldn't go amiss either, but I may be a dinosaur on that stuff.

Pete

its hard to writs .dislexier . i have a 2x2 67 4.2 baire shell at the mo i am a fabricator welder by trade can make most stuff,does any manual bellhousing fit .ie 3.2 or does it have to be 4.2

frenchi wrote:its hard to writs .dislexier . i have a 2x2 67 4.2 baire shell at the mo i am a fabricator welder by trade can make most stuff,does any manual bellhousing fit .ie 3.2 or does it have to be 4.2

I envy your skill - you may need it. At least you have a long wheelbase tub so you have a bit more room. Is it from an auto or manual car? Have you got a V5 hor it because DVLA are getting picky.

Any bell will do for a Getrag so long as the flywheel is the same and preferably the starter although you can get modern replacements. You dhould be able to make up a top remote linkage from photos then and the gearbox mount and crossmrmber mods should be OK for you.

Pete

Peter : have you seen the other thread in which Frenchii asked if a 3.2 litre bellhousing ( he doesn't say whether AJ engine or V8 ) will fit a 4.2 litre XK , and I said no ? Was I wrong ??

i have a 4.2 2x2 engine is from an xj6 1978,i was told a 3.8 bellhousing would not fit,i let one go this morning for 50 quid,,so is it any any classic box will fit a 4.2 as long as you have flywheel to go with it,,if that is the case does any one have a bellhousing for sale please

christopher storey wrote:Peter : have you seen the other thread in which Frenchii asked if a 3.2 litre bellhousing ( he doesn't say whether AJ engine or V8 ) will fit a 4.2 litre XK , and I said no ? Was I wrong ??

Sort of, but mostly no :-)

You can fit an entire 3.2/3.6/4.0L I6 Getrag setup (no such thing as a manual AJV8) including bell, by using a large ring adapter at the block face. This is a common part for V12s. Technically you can do it for the XK too but there are much better options.

What I really meant was any XK bell, as he had cited 3.8/4.2 IIRC. As you know, a 3.8 would have been OK, since the normal requirement to open out the bearing recess for a 4.2 box doesn't apply when using a Getrag box set back from the bell rear face by a 3/8" or 1/2" thick adapter plate.

thanks for your advice, should have spoke to you in the beginingi know what options i have plus thickness of marry plate ,

frenchi wrote:thanks for your advice, should have spoke to you in the beginingi know what options i have plus thickness of marry plate ,

You can do 3/8" in steel but I've seen 1/2" alloy with studs rather than bolts. I have one of each spare. I've never fitted a 1/2" and wonder about pilot bearing engagement. Could fabricate a special top hat protruding bush I guess.

What you must remember is that if you pick a Jag bell you have to have a matching flywheel and starter for the same model if you want to avoid mesh hassles. The 3.8 meshes back to front (Bendix) where the 4.2 meshes front to back (pre-engaged). The flywheel teeth wear to suit, although usually you can grt a gear reduction starter to work with both types.

But really, if you don't have a short box I'd be careful, even in a 2+2, especially if it has no speedo drive. Just too many fabrication and driveshaft and cutting hassles to get a fifth gear, when an overdrive box is all Jag parts and no modifications needed.