| Re: [GMCnet] 403 vs 455 [message #302037] |
Sun, 12 June 2016 01:59  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member |
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Haven't been on since you asked the question. So I'm not up on what's been covered. I'm sure you've heard both are fine. They are. The HP, and torque ratings are very close. I prefer the 403. Had both. On our last 3800 mile trip. And pulling Linda's 5,000 LBS Chevy Uplander. We averaged 10.2 MPG. My 78 Royale has the 3:70 from Applied GMC. I pull trailers a lot. With a GVW of 17, to 21,000 LBS. most of the time.
So I don't know if this was mentioned. One thing to think about is that the 77, and 78 have all the final up dates. Were painted with Dupont Imron. It's extremely durable. And these years have better front A/C units. Our first 78 burned last Aug due to a frig that had a fire recall on it that we didn't know about. Building another 78 Royale now under the Restoration subject heading. It's going to the GMCMI Rally in Branson in 11 days. If you have any questions. Feel free to call anytime. CDT. Bob Dunahugh Cell. 319-521-4891
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