Outer Limits 4x4 Board

My leaf springs are concave up, (which is how they were when I got it), and I've decided to finally do something about it. I've heard that this is a problem in some old Zooks. Should I just replace them or should I get them repaired? What sort of cost am I looking at?

I'm having similar trouble. Although I thought there was only one line. That could be my problem. I don't know the answer but I'd like to know.

What sort of Sierra is it? I've got a 1L 83. The speedo on it always reads 10km slower. I've got a GPS and whether you're going 50kmh or 80kmh, the speedo still reads 10km slower. No idea how to fix it though.

Well...........That might have fixed it! Thats been frustrating me for weeks. Thankyou!!!
We'll see how it goes over the next few days.

I haven't tested the compression yet. The tester I have is too short to get down into the hole. I'll have a go at giving it a good blast.
The problem isn't really noticeable at high speeds. Does that still sound like a valve problem?

I tried a different lead but still had the same problem. Would it be worth trying any of the oil additives to clean the valves or seal leaks, etc?

I've narrowed a running rough problem down to the 3rd cylinder. When I pull the lead off the spark plug while its running, there is not much noticeable difference. If I pull the lead off any of the other plugs, you can hear a definate difference. I've tested the spark plug and the lead and replaced ...

Thanks nelligen, I'll have a look there.

It doesn't get off road too much but I'll check the filter. Is there anything else I should check while I'm at it?
One more question, are oil leaks commmon? I had all my seals replaced about 6 months ago but I've noticed a few leaks recently.

A week ago my 83 Sierra started running rough. I thought it was the timing because the same thing happened a few months ago and I put new plugs, points and cap in and fixed the timing it it was great. I've adjusted the timing again but its still running a bit rough. What should I look at next?

Does anyone have any reccommendations for security on a soft top?

I've searched all over the place but can't find very much information about the 410 specs. I'm looking for a page from the manual with all the specs such as plug gap, points, timing, etc. All of that stuff. Does anyone know where I can find that sort of info or does anyone have an electronic version ...

Whenever I take the top off I just fold it up and put it behind the back seat. That way if it starts raining I just stop and put it on in 30 seconds.

Thanks Stressed, it sounds too easy.

Thanks Stressed, it sounds too easy.

OK, I haven't done the timing before. I'm borrowing a timing light this afternoon. How do I hook it up, etc? I'm also borrowing a compression tester. Does anyone know how to use these?

On the weekend I had to replace the plugs, distributer and the points. 've got it running a heap better than it was but the timing isn't perfect. What do I have to do to get the timing spot on? Its an 83 1L Sierra. Thanks!

Thanks for the quick replies. Thats exactly what I wanted to hear.

My 83 Sierra is just about to pass 200,000km. How long should you expect an engine to last? At the moment it doesn't really use much oil or blow much smoke. When they go, can you feel they're on their way out for a while or can it be really sudden?