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AC deliberately made the reverse gear faster than the first gear. That has been one of the big bugaboos with IH for years they did not have a fast enought reverse. This would shorten the cycle time so that one could begin the process of pushing sooner. One thing a lot of guys liked about the HD5 is that they had a two speed reverse transmission. This was normally in the loader but you would at times find it in crawlers as a special order If you look at the lit for the HD9 AC on www.ibdozing.com in the resources section you will see that reverse first was faster than forward. This was because you want more power going forward since you are pushing. You are not pushing in reverse. I would agree that a tune up on the engine per the HD 5 Service Manual or the GM 271 manual will probably help out on that engine. The larger injectors will give more power and the new inectors will burn a cleaner than what were orginal injectors from GM to AC. They were always a bit conservitive on the injectors they used. The manual details the procecure to determine if you have a bad injector. On those the tips could crack or break or get plugged with carbon. They had a special wire kit that helped to clean this out. I think the AC manual says take the engine apart every 500 or 1000 hours to clean the air box vents ect. You should also get the timing gauge for that motor. That will help to make sure that the timing is correct on the rack. How much are you wetstacking on that motor. Do you have the air cleaner clean. Have you looked up into the cleaner. There is metal screen in there and over the years they will get full of leaves, grass, hay and what ever else a detroit will attempt to suck into to engine. Cleaning this out will help the engine breath better. How do the airbox vents look into the cylinder. Are they within spec. Also watch out for one thing. the blowers on the 2-17 are starting to get hard to find and very expensive. If in doubt, get the seals and bearing rebuilt before you lose the lobes because it will be very costly to fix. Luckily there are still a fair amount of 471 out there. Good Luck You have a great machine.
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