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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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20-12-22, 01:00 PM
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I have just noticed that you say the Cabmasters unit is 64RH. This requires more investigation before rushing to buy.. 46RH seems fine but I don't know about the 64RH.
Edit - I have double checked and can't find any reference to 64RH so assume this was a typo. Last edited by David C; 20-12-22 at 02:58 PM. 
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21-12-22, 06:05 PM
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Points noted about dimensions and trans tunnel. I too would be reluctant to bash or resize the trans tunnel in any way, and there's got to be enough room for the linkage and pipes. I found a site that gave specs for modifying the crossmember and shortening the prop if fitting a 518/46rh. But like you, a smaller trans appeals. Dont want to cause heart attacks anywhere but I know a GM TH200-4R has a good gear spread, is relatively small & light, has a mounting point close to the 727's and should be relatively findable and affordable vs Mopar stuff. Also are rebuildable to take big power. Not that I'll need that, but it'll need to handle big-block torque. At this stage I'm just not sure what to do.
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21-12-22, 06:18 PM
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One of the regular visitors to this site has a 46RH that was fitted to his 410 by a previous owner. I haven't inspected it but I don't think the tunnel modification was too severe and he seems very happy with it.
Given that there seems to be an opportunity to grab a 46RH in this country for very reasonable money I would suggest you give it some serious thought but don't take too long about it if there are only 2 units available.
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24-12-22, 11:04 AM
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Hi - it's me David is referring to - I thought it encroaches a bit as the 410 seemed not terribly roomy down in the footwell but now having driven another (with an original gearbox and not noticed that to be any roomier) I reckon any encroaching is relatively minimal.
My car is going away to have gearbox looked at in a few weeks. If it has to come out - which I'm hoping it doesn't - I'll be able to provide more info. Just out of interest am I right in believing the gearbox has to come out either out the front with the engine attached or it can come out through the car? Thanks Andrew
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24-12-22, 12:08 PM
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The gearbox comes out through the car.
It would be a good plan to get underneath as soon as you can and soak the screws that hold the tunnel in penetrating oil. Yours will probably not be too bad as the tunnel has been out within 20 years. A few of mine were a bit reluctant to be disturbed after 53 years. If the gearbox does have to come out please take lots of pictures of tunnel, chassis, transmission, pipes etc.
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25-12-22, 11:32 AM
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I'll do my best re the photos etc but it's all happening three hours away at these people Home
They had two Bristols in and a Gordon Keeble when I last spoke and came highly recommended - they also fit aftermarket overdrive conversions by the look of their website. Happy Christmas Andrew
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03-01-23, 08:02 PM
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