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GMC Vandura 3500 Questions

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The vehicle is a 1977 GMC MIDAS RV (not in the vehicle list for selection) with the stock autotrans. It suddenly would not go into park when I stopped to get the mail and I later discovered it would not go into reverse as well. The fluid is fine, clean, right level. 57.8K original miles....it is not worn out. It drives fine and all other gears shift smoothly and there is no sign of slippage. I am thinking maybe linkage. I am just learning to walk again, by GOD's grace, and am thinking of getting my hands dirty. This is my only transportation and will soon be my only home the way things are looking. GOD's will be done. Need some insightful advice, if no one minds too much. : ) THANKS in advance. Scott in Bloomington, IN ...genesis_ark@yahoo.com
The one on driver seat is badly faded
84 gmc vandura 3500 6.2 eng. automatic trnsition
Some of the Fuses are showing burnt; the 20 amp slot is damaged.
This is a new thing. My truck stalls when coming to a stop. It seems the faster/harder the braking = stall but other times if I brake lightly and allow for a long distance to slow to a stop (eg coming to a light) it will not stall.

Any ideas?

Thanks!
When we purchased the van, the serpentine belt began coming off after hitting a large patch of water. Father-in-law, who was very mechanically savvy, said van had larger than normal alternator and needed a 955 belt instead of the recommended 945. Put on 955, ran great until a week ago, belt came off, was shredded and bits wrapped around fan post. New belt (955) flies off immediately, and fan area where belt sits (only non-grooved portion of belt system) is completely smooth. Friend suggesting removal of fan cover to see where issue may be - not sure how to do that, nor why belt may be flying off. Any help would be fantastic.
Thank You in advance
OK, I think I put engine oil in the hole that may be the vacuum reservoir. Now my 1996 box truck engine now screams/screeches and the rpg's seem to be going very fast. Why I think it is the vacuum reservoir is there is a black ball attached to hood that seems to line up perfectly to the hole/drain that I put oil in. How do I fix this? Where did that damn oil go? The box truck is so loud screaming. Help! Thanks, (Not blond but should be) Paula
Just started making a very loud screeching sound when I push to accelerate. But stops when I let up. I looked in the engine and it seemed hot. Transmission stick was very hot to the touch and I noticed small amount of smoke coming from the whole where that big black ball that is hooked to the hood lines up with. (Btw it that where the engine oil goes?) the only new thing is that I loaned the box truck and he said he put a quart of 10w30 in it because it was low.it was to have 15w40. Would that cause the screaming sound??
work lights on dash light up
The speedometer sensor on my 1995 G3500 gmc was changed and the speedometer and brake lights worked fine for 2 days. Neither the speedometer nor the brake lights are working now. Is there a reason for these to break down at the same time? The bulbs look fine. They light up when I turn on the headlights.

The fuel gauge is not working properly. The fuel pump pressure is at 17pounds, it is supposed to be 18 pounds. Do you recommend to change the fuel pump?
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