I run a 65 gallon tank in my astro. I wouldn recommend more than a 95
Gallon tank. What year astro are u planning on running? Check your leaf springs.
1995 was the last year they used a composite/ fiberglass mono leaf spring.
If you have the mono spring, I recommend swapping to the 96 and newer steel springs.
You will need the front hangers as well. Very easy swap. Make sure you have decent tires to
hold up to the weight. Check your bump stops and get air shocks or helper air bags.
If you have the fiberglass springs and don`t plan on swapping them, I wouldn`t run more than a 65 gallon tank. The composite springs are prone to cracking if overloaded. Try to keep the tank centered over the axle. Not behind it. I`m on my 2nd astro, so I know my way around them fairly well. Check out
Chevy Astro Vans - GMC Safari Vans. I have the same screen name over there. Good forum for the vans. Very informative.
Sorry if the post looks odd, as I am posting from a phone.
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