1978 CC Dually I picked up the other day

[1985-GMC]

Thanks. One way or another its getting a cast iron gear driven T-case weather it be a married np205, divorced np205, np202, atlas, rockwell or other.

[USSkoval]

Originally Posted by 1985-GMC

Definitely 4" or under, I still want to be able to pull a gooseneck with it. I'll get the cummins as high and far back as possible even if I have to cut into the firewall and trans hump. I think im going to put 37" hummer tires on it too, and I might know a guy with some 16.5 dually wheels I can get. This also means taking out about a 1.5" wedges out of the front of the front fenders and 2"s out of the rear of the front fenders for extra tire clearance while keeping the stock "appearance".

You shouldn't have to trim very much, if at all. I run a 4 inch lift on mine with 36 inch tall tires and there is zero trimming done. I think the most you would need to do is trim the lower edge behind the tire, that little "corner" that tucks under.

Originally Posted by Lower

I have seen plenty of overly abused 241's in offroad rigs live a long time. If you can find a shop to do it you can flip the 241 over and run it upside down so its a right side out for the front. Just need to tig up a couple holes so it wont leak.
Looks like you found a nicely documented truck to start with. I look forward to seeing how it turns out.

Why can't the passenger drop 241 be used? Is it because a Dodge nv4500 is being used, rather than a GM?

[1985-GMC]

Originally Posted by USSkoval

You shouldn't have to trim very much, if at all. I run a 4 inch lift on mine with 36 inch tall tires and there is zero trimming done. I think the most you would need to do is trim the lower edge behind the tire, that little "corner" that tucks under.

I guess i'll see how much room I have when I get to that point then decide from there but I want plenty of tire clearance. Ive done some measuring on my gmc with the 4" lift and it looks like that's what im going to need to do to run 37"s.

Why can't the passenger drop 241 be used? Is it because a Dodge nv4500 is being used, rather than a GM?

Im not sure but it probably could be if you swapped in the 29 spline input instead of the 27 or 32.

[1985-GMC]

Ok I got the spacer done and on the truck, it keeps the carb MUCH cooler. I coated the spacer in Plasti-dip spray. It idles and runs much better, now ive just gotta replace the clutch...

[v30crewcab]

the cummins is a tight fit, but theres no need to cut up the firewall. I have a 4" lift, 35's, and tow with mine all the time. 37's should fit fine.

[Your41Plague12]

My dad had a 4" lift and 37x14.50 Armstrong Tru-Tracs on a 78 K10 back in the day. As already stated, he had to trim a tiny portion of the back corner of his front fender. It looked really mean with that little lift and that much tire.

[Mattman2010]

Looking good tony!
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