Join Date: Sep 1999
Location: San Diego County, CA
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Re: 98 Z71
On my '98 Z-71 the shimmy only occurs on the freeway (if this is what you're talking about), and with that damned grooved and sections highway. If feels like the middle is going to buck up every second.
About the BFG's. The only tires that really "set" with a flat spot on BFG's are the Baja Terrains. It's the type of rubber that makes them flatten out overnight. Once you get the tire heated up though it should be fine.
As for other things to look out for on the '98:
Check the battery and cables regularly. For some reason, and so far this has happened twice in as many '98 Chevy's, the battery cables end up corroding and this last time the terminal came out of the battery!
Fuel pump. Might go out on you -- might not! If you get a warranty option then take it.
Intake manifold gasket. Check to make sure that the dealer already replaced it with the newer type. Otherwise take it in the first moment you smell anti-freeze during driving.
EVO Steering sensor. These have a tendancy to go out. Doesn't really "hurt" anything, but you'll notice that it's not easy to turn at low speeds (5-10 mph) and not more difficult to turn at higher speeds.
"Other than that", '98 seems to be a good year for the truck! I'm actually quite happy with mine, aside from the fact that it's black and it only stays beautifully clean for abut 15 minutes...