1990 b2600I timing chain or belt

I just bought a 1990-1991 b2600I and I was wondering if it had a timing chain or timing belt? Also, the truck only has like 79l miles, how long till I need to replace?
thanks
Eric

My son has a '91 b2600i. It's a chain. I would think they can go 125,000 miles or so. I imagine that a repair manual would give the recommended replacement interval.

mikecee is right. It is a timing chain, and the shop manual has no requirement for replacing it. (The B2200 has a belt with a replacement interval of 60K).

I bought my '90 B2600i new seventeen years ago this week. It's got 191K on her, and is still using the original timing chain, O2 sensor, muffler, water pump, alternator, and driver!

Andrew
San Diego

that's great news to hear, Have you had really good luck as far as maintenance on everything else? Also, what kind of mpg do you get?
thanks