454cid
Sooper Pooper
Check the upfitter manual for truck dimensions.
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http://abell.as.arizona.edu/~hill/4x4/TrackTruckRRTI2.jpg
I think you might be getting in over your head but here's one.
According to the pic it doesn't look all that great with a three foot bed. I think your best option is to either continue with your RCLB or find a ECSB and build it up.
Took a second look at that picture, looks like it's the length of a Tahoe. Maybe took a Tahoe frame and put a EC on it and hacked up a bed? A suburban I believe is also the length of a ECSB, so if you bought a burban and hacked it that's no different than just starting out with a ECSB.
that looks like ****. Just get an old cheap ECSB. I wheel my truck and havnt ever had a wheelbase issue. I have had a width issue though.
IMO if your trying to build a off road rig that you are going to beat up you could try it, but if your actually trying to make a driver out of it and you want it to look good i think you're going to have some trouble unless your good at body work....
I've seen some people take a tahoe or a yukon and cut the back end off like a avalanche before, but you can find ECSB's at such as cheap price i'd go buy a ECSB and SAS it if your trying to build a off road rig.
I'm up for the challenge and I don't think it will look that bad if I have my measurements correct from my research than I will have about a foot between the wheel well and the cab should be about a 5 foot bed. Kinda look like an ECSB but with one foot instead of two between the cab and wheel well If I do it I will mounting a 20 gallon fuel cell in the front of the bed.