F350 with f250 blocks?? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 06-27-2011, 07:36 PM Thread Starter
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F350 with f250 blocks??

I am considering removing my leveling kit, changing my 350 4" blocks to f250 2" blocks. I currently get 15 mpg. I am looking for opinions on what mpg gains I can get and what the gain would be after that if I swap the 35's for 33's after I lower it?? Advise and who has done this...

2005 F350 ex-cab long bed, 4x4. SRW. Big tires, bolts here and there...deleted a few things, added a few others, a couple monitoring devices.
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post #2 of 12 (permalink) Old 06-27-2011, 10:17 PM
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Re: F350 with f250 blocks??

I've done the swap. My reason was to lower the rear end to make the truck more usable. I think it looks much better too. I run stock 265/75 tires mpg is 20 over long empty cruises, 15 in the city.

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

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26' 7500# Creekside RV Trailer
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post #3 of 12 (permalink) Old 06-27-2011, 10:54 PM Thread Starter
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Re: F350 with f250 blocks??

I figure the aerodynamics have got to improve getting lower, tire size may have to wait till I wear these out or find someone to swap with.

2005 F350 ex-cab long bed, 4x4. SRW. Big tires, bolts here and there...deleted a few things, added a few others, a couple monitoring devices.
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post #4 of 12 (permalink) Old 06-28-2011, 09:57 PM
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Re: F350 with f250 blocks??

How big of a deal is it to switch to f250 blocks? with my new pin on the 5er I dont have as much room between the bed and the trailer as I want and I would rather NOT lift my trailer.

01 F350 CCLB SRW
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post #5 of 12 (permalink) Old 06-28-2011, 11:36 PM Thread Starter
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Re: F350 with f250 blocks??

It's not a hard switch just pull the wheel, drop the shock, remove the u-bolts swap out the block, replace with new u-bolts reinstall everything. 40 min a side with air tools??

2005 F350 ex-cab long bed, 4x4. SRW. Big tires, bolts here and there...deleted a few things, added a few others, a couple monitoring devices.
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post #6 of 12 (permalink) Old 06-29-2011, 03:13 AM
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Re: F350 with f250 blocks??

can you use the same shocks? or do you need to replace them with shorter shocks?

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post #7 of 12 (permalink) Old 06-29-2011, 06:02 PM
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Re: F350 with f250 blocks??

I used the same OEM ford shocks that are now 154000 miles old. This is a tough part, some places sell F250/F350 shocks which makes you think they are the same. I don't know, but I do know that if I buy new shocks they will be for the F250.

Be sure to have a nice big jack since you'll need to be able to lift the rear end without jacking on the axle. I used the trailer hitch. I wanted to remove both blocks at teh same time so that I could be sure that everything went back together striaght and proper. If you only do one side at a time, you will have things twisted up when you torque them.

The OEM U-bolt nuts are a locknut thing that will suck to remove by hand. Air tools are your friend.

The other thing that you may consider is the carrier bearing drop bracket. The F250s have a shorter one to maintain driveline angles. I haven't noticed any shudder but you might.

I had a problem with the rear sway bar hitting the exhaust after lowering the truck. Easy fix... remove the rear swaybar. Remember that the drop links will be longer on the F350 so even if you leave the rear sway bar, your drop links will make it sit funny.

Ford had a TSB to lower the F350s using F250 components. The TSB included lots of weird items. The reason was that fifth wheel folks couldn't tow with the F350. Risk of contact between bed and trailer.

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

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post #8 of 12 (permalink) Old 06-29-2011, 06:06 PM
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Re: F350 with f250 blocks??

Thanks for your input on this!!

Sorry to the OP for derailing the thread...

Quote:
Originally Posted by Highbeam View Post
Ford had a TSB to lower the F350s using F250 components. The TSB included lots of weird items. The reason was that fifth wheel folks couldn't tow with the F350. Risk of contact between bed and trailer.
This is the reason why I want to do it! My cedar creek sits very low and has a very tall roof. I would rather lower the truck vs lifting the already tall trailer!

01 F350 CCLB SRW
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post #9 of 12 (permalink) Old 06-29-2011, 07:45 PM
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Re: F350 with f250 blocks??

I tow a bumper pull RV, leaving on a trip with it tomorrow in fact, and lowering the truck to F250 height meant my ball dropped just over 2 inches. It's really not a lot but it makes a huge difference in looks and when loading motorcycles and other items into the bed.

I was a chevy truck owner and those trucks have nice, low, bed heights that make it a pleasure to use. The F250 block swap got me much closer to a reasonable height.

Modern RVs are getting taller so your next RV might not be so bad.

2000 F350 SRW, 4wd, CCSB, PSD
Lowered rear end to F250 height, 4" exhaust w/ muff, foil delete, AIH delete, Ford AIS intake, tru-cool trans cooler, autometer under dash pod and gauges, Mile Marker hubs, 04 headlights, soft tonneau

18' 10k rated PJ car hauler
26' 7500# Creekside RV Trailer
Kioti CK30 tractor
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post #10 of 12 (permalink) Old 06-29-2011, 10:33 PM Thread Starter
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Re: F350 with f250 blocks??

No hijack at all...this is all good info :)

2005 F350 ex-cab long bed, 4x4. SRW. Big tires, bolts here and there...deleted a few things, added a few others, a couple monitoring devices.
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