5.4 cummins conversion
Thread Starter
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Junior User
Joined: Dec 2011
Posts: 64
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It has 36's MT mtz's right now, id like to get some 35" or 33" nitrro terra grapplers. I'm really not sure if its been regeared or still has 3.73s. I've been meaning to check but haven't gotten around to doing it.
Lead Driver
Joined: Nov 2008
Posts: 8,449
Likes: 70
From: South Jersey
trying to figure out why the 5.4 isnt enough in a reg cab truck? If your going to keep 36's or down to 35's i would do gears first especially with the puny 3.73 sissy gears ford put in these trucks. I have 4.30's with 285 75R16 tires and it perfect, 35's might still be good but i would prefer 4.56 for light towing and 4.88 for near max towing on the 5.4
Elder User
Joined: May 2011
Posts: 527
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Problem is the 5.4 itself, its just not going to be in the same universe as a diesel so why not? Especially if you have a tired engine and its almost a 100% bolt in with the kits. More reliable, more powerful, MUCH better mileage and just plain cooler.
Lead Driver
Joined: Nov 2008
Posts: 8,449
Likes: 70
From: South Jersey
but the OP didnt say his engine was tired did he? He simply asked about it thats all. If his problem is a little underpowered i would say gears first especially with 36's and stock 3.73 gears.
Cargo Master
Joined: Jan 2009
Posts: 2,769
Likes: 8
From: Lubbock
The 2v 5.4 is crap compared to the 3v and 4v motors that are avalible. My 03 mustang vs my 06 mustang is no comparison and the 06 gets easily 5mpg better with more power in a heavier car. Imagine what is capable with a supercharger and a 4v motor. Likely the mpgs won't improve drastically but power should. With a diesel and the right set up 18-20mpg is possible and gt mustang acceleration. Also better towing performance.
Last edited by Lubbockguy1979; Dec 27, 2011 at 02:55 PM. Reason: ................
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MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,602
Likes: 148
From: SE Georgia
just regear the truck
no wonder you hate the performance. You are running 36" rubber. put some 4.56 gears in there. That will get your final drive ratio back to the factory ratio.
before you throw money at a motor, do the gears. about $1,500 for both axles. You'll think you bolted on +30 hp
no wonder you hate the performance. You are running 36" rubber. put some 4.56 gears in there. That will get your final drive ratio back to the factory ratio.
before you throw money at a motor, do the gears. about $1,500 for both axles. You'll think you bolted on +30 hp
Lead Driver
Joined: Nov 2008
Posts: 8,449
Likes: 70
From: South Jersey
just regear the truck
no wonder you hate the performance. You are running 36" rubber. put some 4.56 gears in there. That will get your final drive ratio back to the factory ratio.
before you throw money at a motor, do the gears. about $1,500 for both axles. You'll think you bolted on +30 hp
no wonder you hate the performance. You are running 36" rubber. put some 4.56 gears in there. That will get your final drive ratio back to the factory ratio.
before you throw money at a motor, do the gears. about $1,500 for both axles. You'll think you bolted on +30 hp
Thanks tylus at least someone agrees with me! Besides why would someone spend 10k plus on a cummings conversion when you can install a V10 for $1500? And the proper gears for another $1500
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,602
Likes: 148
From: SE Georgia
I've had 2 of the 5.4 motors (both 3v), and 2 of the 4.6 motors (2v and 3v). I love the modular motors. Reliable as hell, decent gas mileage, and who can argue with 80% of torque available at 1,000 RPM?
the 5.4 2v is a bit overwhelmed by the 99-04 SD...true. But you can easily fix that with gearing and custom tuning. It won't be a rocket ship, but it'll get the job done every day, all day long.
A bone stock 5.4 2v is more than adequate as well. But we always want more
Thread Starter
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Junior User
Joined: Dec 2011
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Currently leaning towards 4.56s right now, mainly because of cost. The torque of the diesel would be nice, but it is what it is. I do like the idea of putting on a supercharger from a lightning or HD. Could always put 4v heads on it too if I felt like it, would be a nice combo with a supercharger.
Logistics Pro
Joined: Nov 2010
Posts: 4,654
Likes: 20
From: Tewksbury, MA
Which would be more cost effective though, deisels last forever nd have good power/ torque and if you beef up the 5.4 how long would it potentialy last after the rebuild? (Im still learning all this stuff so im making a complete guess lol)