I’m certain a standard rear Escort axle won’t be much stronger than say a Sprint axle.
I know I’ve broke/snapped quite a few.
Even with a mildly tweaked pinto.
Use to change gear when the valves bounced.
Those where the days before Gatso’s and camera vans.
From some online research, a stock English definitely would not stand up to a Sprint axles I think I’ve asked on here before and the rating I’ve been told for a sprint axle is around 240hp with some gentle driving. As far as I can tell, a stock English would break at around 150hp with some heavy driving, new shafts get to around 250hp. but a built English would go pretty far.
RetroFord do a build kit, which is a limited slip diff and larger half shafts which apparently push the rating to over 300hp. Considering that the jag engine makes less power than this stock, but will produce considerably more torque than a high power 4pot, I think even with this it’ll be a matter of time before something breaks.
Which makes the other point easier to make, the cost to repair and replace. I can find and source old English axles with relative ease quite cheaply. I’m going tomorrow to get two English axle casings for the grand sum of £40!! A LSD is anywhere from £300 used to £600 new, there’s dozens of companies making them, same goes for half shafts
A sprint axle?? There currently isn’t one for sale on any market place online, unless there’s one or two available on here, so I can’t get an accurate price, and a LSD from quaife/rimmerbros?? £1000!, and there’s pretty much no aftermarket support.
Yes, I know a sprint axle would just drop in and work, but I’d pay for it in the long run. I’d rather pay the £2k to build up an English with minimal fabrication knowing I could easily replace it