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1971 rear strut v 1975


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#1 zzzzed

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Posted 09 August 2015 - 05:21 PM

Is it the length of the strut or the hight of the spring on the rear that is different from 240z to 260z

#2 gilltech

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Posted 09 August 2015 - 07:00 PM

Not a simple answer.
The spring rates are different from one year to the next, as the cars progressively got heavier.
And the strut design was changed several times.
In a given year there were different spring rates installed depending on market, model & specification such as 'sports' or not, A/C or not, etc.

#3 zzzzed

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Posted 09 August 2015 - 07:42 PM

I remember putting the whole strut from my 73 240z in a 74 2+2  It lowered the rear of the 2+2 quite a bit.
What I wanted to try is putting the rear springs from a 72 240z that I have here in my 1975 2 seater.
Then use some rear strut tops in the front to try level it out.
Would this work to lower my 2 seater and keep the ride reasonably comfortable?

#4 gilltech

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Posted 09 August 2015 - 08:10 PM

Yes the 2+2 rear struts are much taller than the 2-seater 260 (or 240) struts.
Your 240 spring rate would be less than the 2-seat 260 - the latter being a slightly heavier car - but after 40+ years some of it comes down to the relative condition of the springs, sag etc. Give it a try, but might be a touch soft perhaps.

Personally I prefer to have the front slightly downward raked, rather than have the car sit level at rest, to offset the frontal lift the Zed is prevalent to at speed.
I have fitted the front struts & springs out of a later 260 (my 260 2-seat is very early, like a 240), which are shorter than the originals, so the front's dropped about 15mm IIRC - it's been many years so don't quote me, got it written down somewhere.
Spring-wise I had the front springs re-set to 20mm shorter, & trimmed the rears a 1/2 coil which both shortened them & stiffened them slightly (it was all calculated). That worked fine for me, end result was just the right sensible amount IMO & in any case my driveway at the time had a tricky transition where it met the road & at worst case I had just 10mm clearance to the exhaust.
I haven't ever played mix-n-match with the different strut cap heights. Others on this forum have & could help.

#5 zzzzed

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Posted 09 August 2015 - 10:27 PM

The rear strut tower is shorter in the 72 240z doner than my 75 2 seater.

#6 gilltech

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Posted 10 August 2015 - 04:13 PM

The 260's rear strut tower design changed at least twice after the early ones in '74 so maybe 3 x different heights. 2+2 different again of course.




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