Go down south hwy 225 and see Stan Fleming he's a go too guy on chevy engines, he is on the left before Cananland Christian School in a block building 770 709 8517
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Has the trans been changed? Sounds like incorrect gearing......
If for sure its a SM465? Or are you reading the RPO list? Just curious.....
Has the rear axle been changed? SM465's came with 3:42 or lower for towing.
NP833 style transmission also had 3:73 or lower from factory.
Being a 1984 model with a 4 speed, can you tell me what kind of transmission it has, and what the rear gear ratio is.
Some of these trucks came with NP833 style transmissions( yes a known dodge tranny installed from factory). if you have a high gear in the rear end such as a 3:08, It'll drive but no power due to indifference in final drive ratio. 1st gear will pull fine, second and third with wind out a long ways, then 4th is actually overdrive. .
P.S. this era of engine also had a retarded cam gear marking for fuel efficiency, and had almost no advance in timing. same gear set can be used from a 76 model engine with better results. Also you can buy a adjustable vacuum advance for you HEI setup. May help with your tweaking for more power.
Just my 2 cents. worth looking at the trans and gear ratios first.
Post a picture of the build codes from the glove box. It is the sticker with a ton of 3 and 4 letter groups.
I have a Brother in Chatsworth who would be happy to help if you're up to it?Not one in the glove box. Only sticker remaining is the camper loading information.
I have a Brother in Chatsworth who would be happy to help if you're up to it?