So in the rear the truck has OME medium springs. The BP51’s back there are set at 6 compression and 5 rebound. A touch stiff say if you bomb over a speed bump, that’s one of my tests. But they keep the back solid on road. Off road, real nice at 5 and 4. The FR drawers are an easy 100-150lbs with not much gear in them. Roof rack as well, heavy 255 MT spare, so light yes but not super light for a 70.
That’s the thing man, BP51 is only shock you can adjust compression and rebound, ten settings each so that is many combinations. I wouldn’t worry one bit about it being to heavy duty for a SWB 70.
In the front I am running them a notch higher, 7 & 6. 79-series sway bar up front which is substantially larger than an 80 diameter wise. Any lower in the front on road and it has to much body roll for my tastes, off-road can go much lower and it is money. I actually couldn’t believe how well a SEB can handle rough stuff at speed, coils and these shocks does it well. I don’t think there is a BP51 available for the front on a leaf spring 70 though. Which means customizing if you wanted them in front too.
I don’t have part numbers, these came off a 1999+ and bolt right up, suited for 2.5” lift I believe. They are second hand.
Cheers