suspension
 

how do you tell if you have z51 suspension on my c4 1985 corvette?

This link has some data.
Looks like, springs and stuff.
Is the Code z51 on your body tag?

?
 

where is that located at?

oops sorry, forgot the links.


You car should have a RPO sticker that lists all options the car came with.
The sticker is under the console lid or in the storage box behind the passanger seat.

Here are a few vague links about z51

https://www.corvsport.com/1987-c4-corvette/

* Z51 ‑ Performance handling package

1984

C4 (1984-96) Suspension Packages


RPO Z51 Performance Handling Package (1984-90, 1996)

Original Option Price: $350-1,295 (The latter price represents 1988 models, which included 17 inch wheels)

Much more common on C5s and C6s than it was on C4s, the Z51 package had a few small changes over its few years available on a C4.

1984 models: Heavy duty springs, shocks, and bushings, larger sway bars, fast ratio steering, engine oil cooler, and auxiliary fan.

1985-90 models: Heavy duty springs and bushings, Bilstein shocks, larger sway bars, fast ratio steering, and heavy duty cooling.
Larger front brake rotors and calipers became standard in 1988, as well as 17 inch wheels.
Both Z51 and base suspension spring rates were decreased in 1985 due to harsh ride compaints from the 1984 model.
A power steering cooler was added to the package for 1987, the same year that structural enhancements that were previously only available on Convertibles were also added to Coupes.

1996 models: Heavy duty springs and bushings, Bilstein shocks, and larger sway bars.
Heavy duty cooling options and fast ratio steering had become standard on all models at this point.
Non-Grand Sport models also received 275/40/17 size tires on all four wheels instead of 285/40/17s in the rear, and 255,/45/17s in the front.

Option Restrictions: 1987-90 models required a manual transmission;
Not available on a Convertible until 1996; 1996 models also required power seats, and Performance Axle Ratio, if ordered on an automatic car.
Not available with FX3 or F45.