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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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Old 10-02-2012, 01:33 AM
jl429 jl429 is offline
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460 gas mileage improvements

79 f-3504x4 460 nv4500 trans 4:10 gears 33-12.50-16.5 tires anybody getting anything above 9.1 mpg? changed holley 600cfm carb to holley 750 cfm carb. 8.6 mpg -600cfm to 9.1 mpg-750cfm with#72 jets stock cam performer 460 manifold dual exhaust. truck regularly pulls 16ft. horse trailer with horses. any tips besides 12 valve cummins engine swap?
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Old 10-02-2012, 01:49 AM
vic_v8 vic_v8 is offline
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maybe try a skinnier tire? electric fan?

side note, did you swap in that NV4500 yourself?
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Old 10-02-2012, 07:13 AM
77F150Jason 77F150Jason is offline
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A 460 is what it is. It's not really known for gas mileage. If you're going to pull alot, I would just buy a diesel truck if you want any better gas mileage. just my opinion.
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Old 10-02-2012, 07:16 AM
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garthneddy garthneddy is offline
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460s are just thirsty. I dont think you can do anything to get much better then 10 mpg
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Old 10-02-2012, 10:13 AM
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psquare7575 psquare7575 is offline
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I saw no mention of headers, any head work, aluminum items for weigh savings, electric fan, different pullies, a different cam, etc.
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Old 10-03-2012, 07:28 AM
77F150Jason 77F150Jason is offline
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psquare, you nailed that one. X2 on that!
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79 F-150 Lariat 4X4-400-Auto,CC,A/C,PS,PB
73 F-250 highboy-460-4X4
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Old 10-07-2012, 12:48 AM
jl429 jl429 is offline
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A machinist friend and I did the swap with a nv4500 swap manual. The tranny is out of an early 90's GM 1 ton with 6:34 granny gear.We made an adapter plate from a piece of 1" plate since there are no adapter plate for the early tranny. We used a GM 4wd mainshaft and installed a GM input gear in the NP 205 so no adapters on the mainshaft. We cut the input shaft on the NP 435 and the NV4500, cut an index pin on one shaft and bored a hole in the otherand made sure the overall length was correct. We used a welding procedure where we preheated the input shaft and welded the shaft with 100,000 psi tensil strength wire. No problems with the input shaft after 5 years of use. We used the original Ford cluch plate. We used a GM tranny mount and had to do some alterations to the crossmember. We lengthened the front driveshaft and shortened the rear. We had to relocate the transfer case lever and cut a hole in the tranny cover. I didn't notice any increase in mileage but it made the truck go faster. Total cost including the tranny approximately $1300.
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Old 10-07-2012, 09:59 AM
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grandmas77f150 grandmas77f150 is offline
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I wish I got 9 MPG. I get 7 with my 351M
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Old 10-07-2012, 04:45 PM
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Change it to a 445ci
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Old 10-07-2012, 05:58 PM
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f250custom78 f250custom78 is offline
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Hmmmm your best bet for better mileage with a 460 is to pull the truck with a horse
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Old 10-07-2012, 08:15 PM
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9 with a 460 is not bad at all.
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Old 10-07-2012, 11:32 PM
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Just curious. Do you have E10 fuel there? When we went to that locally, I noticed a 10-15% drop in fuel economy, in all my cars....
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Old 10-07-2012, 11:32 PM
 
 
 
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