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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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22-09-21, 09:56 AM
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The four-speed A518/46RH is essentially a three-speed 727 Torqueflite with an overdrive fourth gear in a slightly longer housing, the bellhousing pattern etc is the same so will bolt to what a small block727 did (a big block will need an adapter or the bellhousing cut off and replaced). With a “three-wire” lock-up A518, the operation of fourth gear and the lock-up can be controlled via oil pressure and vacuum switches.
Last edited by Philip; 22-09-21 at 10:15 AM. 
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25-09-21, 03:41 AM
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Back on the 21/05/2014 Member GOFFJASON started a thread about fitting a 4 speed box to a 412. Jason, last I contacted him, was well on the way to doing the conversion. I have not been able to contact him for some time but you will find some good infomation in these posts. From what I learnt from Geoff it isnt a five minute job.
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