Motor Swap weight difference
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Mountain Pass
Joined: Sep 2008
Posts: 191
Likes: 1
Motor Swap weight difference
We pulled out out the factory 400 cid and C-6 and are going back together with a '92 5.9 cummins and a 47RH trans. Has anyone that has done this know how much weight I am adding?
Thanks
Thanks
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
when you set what engine in 4wydnr?
75F350 is right on the weights. If I remember right a 5.9l cummins is 1200 lbs before you put 3 GALLONS of oil in it!
My cummins squatted the front a little bit more than the 360 that came out - but it didn't seem like too much. It's been so long since I've had it together to look though that I can't remember how much
75F350 is right on the weights. If I remember right a 5.9l cummins is 1200 lbs before you put 3 GALLONS of oil in it!
My cummins squatted the front a little bit more than the 360 that came out - but it didn't seem like too much. It's been so long since I've had it together to look though that I can't remember how much
Elder User
Joined: Feb 2008
Posts: 550
Likes: 0
From: N. IL
The height difference was from no engine or trans to installing the cummins and nv4500. I bought the truck with no engine in it, but the last motor in there was a 460 I think. According to the VIN decoder in the lmc crapalog it came from the factory with a 400 and C6 combo.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
IIRC the spring rate on a F250 is close to 600lbs/in (I would have to look it up and you could easily enough to get exact figures) then your putting in a 1200lb engine so if you put it all on 1 spring it would drop it 2" BUT remember it actually is spread between the springs so 1" per side not taking into account what weight will be transfered to the rear springs.
the difference between a 400 and a cummins is a little over 600lbs, divided in half is 300lbs per spring increase which adds up to about an extra 1/2" of drop.
Not enough drop to worry about IMO.
the difference between a 400 and a cummins is a little over 600lbs, divided in half is 300lbs per spring increase which adds up to about an extra 1/2" of drop.
Not enough drop to worry about IMO.
Lead Driver
Joined: May 2007
Posts: 6,993
Likes: 15
From: Costa Mesa, CA
good to know. I figured the extra weight would "soften" up my ride a bit. Now I just gotta finish the dang thing so I can drive it and test my theory
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Posting Guru
Joined: Jun 2002
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From: where the deer and antelo
I got about 1/2" drop from a 460/4speed to a 5.9 Cummins/5 speed NV4500. I had my springs re-arched and added a leaf and have close to a 2" lift now.
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