Tallyho Posted July 21, 2018 Share Posted July 21, 2018 My f250 was originally equipped with a 351 but before I got it, it was swapped with a 460. Is there items that a stock 460 truck would have that mine doesnt? Like the radiator, trans, gearing ect. Should i stick to the tow ratings of the 351? Thanks Link to comment Share on other sites More sharing options...
85lebaront2 Posted July 21, 2018 Share Posted July 21, 2018 Radiator is the same, trans, unless it's a manual that would have been changed too, gearing use your axle ratio and look at the tow ratings in the owner's manual (if you have it). Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 22, 2018 Share Posted July 22, 2018 Radiator is the same, trans, unless it's a manual that would have been changed too, gearing use your axle ratio and look at the tow ratings in the owner's manual (if you have it). Tow ratings are at Specifications/Towing. And the typical gearing of 3.50 or 3.55 gives 7800 lbs for the 351 and 11,500 for the 460. But remember that we are talking Gross Combined Weight Rating, and you have to subtract the weight of the truck and its contents from that to get the trailer & its max load. Link to comment Share on other sites More sharing options...
Tallyho Posted July 22, 2018 Author Share Posted July 22, 2018 Tow ratings are at Specifications/Towing. And the typical gearing of 3.50 or 3.55 gives 7800 lbs for the 351 and 11,500 for the 460. But remember that we are talking Gross Combined Weight Rating, and you have to subtract the weight of the truck and its contents from that to get the trailer & its max load. Thanks guys, it is a manual trans and probably has the trans from the 351. Is that going to a problem under hard use? So Gary if I understand you correctly a rough estimate of my actual tow capacity is 11500lbs subtract 5500lbs for the truck leaves 6000lbs? Then figure 80% of that for safety margin? For a grand total of 4800lbs. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 22, 2018 Share Posted July 22, 2018 Thanks guys, it is a manual trans and probably has the trans from the 351. Is that going to a problem under hard use? So Gary if I understand you correctly a rough estimate of my actual tow capacity is 11500lbs subtract 5500lbs for the truck leaves 6000lbs? Then figure 80% of that for safety margin? For a grand total of 4800lbs. Yes on the towing capacity. But, that is just a guess because I don't know your axle ratio. However, you can figure that out by decoding the certification label. But no on the transmission. A 351W has a different bolt pattern for the bell housing than does a 460, so they had to have changed out the transmission with the engine. Link to comment Share on other sites More sharing options...
85lebaront2 Posted July 22, 2018 Share Posted July 22, 2018 Yes on the towing capacity. But, that is just a guess because I don't know your axle ratio. However, you can figure that out by decoding the certification label. But no on the transmission. A 351W has a different bolt pattern for the bell housing than does a 460, so they had to have changed out the transmission with the engine. Gary, if it is the T18 or any other manual that has a separate clutch housing it could be the same transmission. Bigger concern would be is his the light duty F250 or the heavy duty F250? Rear axle style and wheel bolt pattern will tell on that. If it has the semi-floating axle then it will be the light duty, full floating is the heavy duty (one of Ford's idiosyncrasies of the era) which continued into the late 90s with the new body and mod motored F250 in 98 followed by the Super Duty body so the Power Stroke would fit under the hood. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 22, 2018 Share Posted July 22, 2018 Gary, if it is the T18 or any other manual that has a separate clutch housing it could be the same transmission. Bigger concern would be is his the light duty F250 or the heavy duty F250? Rear axle style and wheel bolt pattern will tell on that. If it has the semi-floating axle then it will be the light duty, full floating is the heavy duty (one of Ford's idiosyncrasies of the era) which continued into the late 90s with the new body and mod motored F250 in 98 followed by the Super Duty body so the Power Stroke would fit under the hood. Bill - I forgot that some of those have an interchangeable bell housing. So he could have the 351W transmission but a 460 bell. However, looking at the towing spec's in the owner's manual Ford didn't seem to think that the specifics of the transmission, meaning 351W T18 or 460 T18, or the model of the truck, meaning F150, 250, or 350, made any difference. It appears the towing limit was determined by the engine and axle ratio. Apparently it was just a matter of torque rather than axle, frame, or spring capacity. Link to comment Share on other sites More sharing options...
85lebaront2 Posted July 22, 2018 Share Posted July 22, 2018 Bill - I forgot that some of those have an interchangeable bell housing. So he could have the 351W transmission but a 460 bell. However, looking at the towing spec's in the owner's manual Ford didn't seem to think that the specifics of the transmission, meaning 351W T18 or 460 T18, or the model of the truck, meaning F150, 250, or 350, made any difference. It appears the towing limit was determined by the engine and axle ratio. Apparently it was just a matter of torque rather than axle, frame, or spring capacity. Yes, you were thinking ZF5 trannys. The SROD, T18, the old RUG 3 speed, all have a separate clutch housing. Link to comment Share on other sites More sharing options...
Gary Lewis Posted July 22, 2018 Share Posted July 22, 2018 Yes, you were thinking ZF5 trannys. The SROD, T18, the old RUG 3 speed, all have a separate clutch housing. As does the NP435. Link to comment Share on other sites More sharing options...
Tallyho Posted July 22, 2018 Author Share Posted July 22, 2018 As does the NP435. All good info guys! I did a little digging and came up with the info that the 351 had the t18 and the 460 would have had a t19. T18 had a non synchro 1st granny 6.32:1 ratio to compensate for the lack of power for the 351. While the t18 had a synchronized 1st gear of 4:1 which really isn't a granny low. I'm thinking my truck has a t19 because 1st is all but useless for normal driving. While researching this I could out my reverse ratio is 7.44:1 which makes it incredible slow in reverse while plowing lol. Link to comment Share on other sites More sharing options...
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