I got round to changing the shocks yesterday. Not to hard a job really. I jacked up the rear end, chocked all the wheels (both sides) and put a jack under the diff.
With the wheel off it's easy to see what needs to be done.
Both top and bottom nuts need a 19mm spanner and the obligatory WD40 to free up the rusty components.
First I removed the damaged nearside unit which was easy enough. The poly bushes were well seized into the top of the shock and the sleeve on the top mount needed to be cut off. Lots of swearing and cursing and flailing of hammers ....
With the bush cut off I saw that the rear domed washer was on backwards (flat side to the bushes), it was also seized on, however a tap with a hammer freed it up easily enough. A bit of emery and a handful of grease later she was all back together and the new shock installed. The bottom was easy, the supplied bushes and washers on the shock was compressed and the bottom shaft fits in the mount easily. Holding the shock body with a pipe wrench wrench was enough to allow us to wind on the bottom nut although I held the bottom of the shaft steady with a pair of mole grips to give it that final tighten.
The other side wasn't so badly seized although the previous owner had possibly lost the inner domed washer as when we took off the shock we say this was just a plain one.
I did notice that when the axle was lowered to allow us to insert the shock into lower mount, the spring came away from it's upper 'cups'. The last picture shows it half off however when the jack under the diff was lowered and the shock fully extended the springs were out of the cups by around 4"...
Need to do something about that I think ...
Have ordered new top washers from Rimmer ...
The Terrafirma shocks give a much smoother ride than the old ones, much less teeth jarring over the pot holes but slightly more 'roll' on corners etc. The old shock was really stiff to compress, the Terra's are much easier.
Overall an improvement.