Hi,
You asked: If I change the rear springs, do I have to change the fronts?
In short. No.
However you did not tell us how you intend to use the car. I will say that
the stiffer rear with the stock fronts does lead to some interesting
handling issues, but when I did this with my '74 TR6 (CF14111U), the car
got to be very neutral when I put the blue springs on the front. And the
urethane bushings too. Prior to adding the fronts, when I was just running
the rears, the car was a little tail happy, but more so when driving in the
wet.
I have driven 10's of thousands of miles with this setup (the blues all
around and poly bushings everywhere). It is not that much of a harsher ride
than stock. And the car handles way better when I auotcross it (as opposed
to the stock setup.)
I'll add that the car won't tend to get too tail happy until you put in a
big swaybar in the back. You can counteract that by putting in a limited
slip. ;-) Oh, and you want a bigger bar on the front too.
As you may have guessed - you're heading down a path that has a lot of
opportunites. I hope your bank account and/or credit rating are in good order.
Good luck,
rml
TR6's
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