advantage of frame construction in automobile
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Body on frames are incredibly tough. In offroad conditions the body of a vehicle is forced into different orientations, often at the same time, as the vehicle navigates the uneven terrain. The frame (which the body is bolted to) has a far high torsional strength than unibody vehicles. The frame takes most of the punishment. A unibody will require a fair bit of engineering to deal with the stresses the body will be subjected to. Interestingly, the Grand Cherokee is a very capable unibody but has a front and rear frame.
A single frame can support a lot of different body types, allowing more variations with reduced costs.
It is easier to repair the body-on-frame vehicle as parts are replaced as needed. A unibody is typically safer because the whole body is designed to absorb the forces of impact, but that means more extensive damage and in some cases the integrity is compromised.
While some unibody SUV are decent tow vehicles, they are usually of the premium variety. And they have relatively lower towing limits. Anything upwards of 10k kilograms, and you will need a proper body on frame truck.
Some body-on-frame vehicles intended to take a beating as a matter of course include:
Land cruiser (and the Lexus variant)
Patrol
Hilux
Expedition
Yukon
Escalade
Wrangler
Any pickup truck
Some unibody SUVs/Crossovers
Range rover
Grand Cherokee
CRV
RAV 4
Highlander
Murano
Pilot
Santa Fe
As one can probably tell from the list, the unibodies are not principally work horses.That said, a lot of the advantages of body on frames are being eroded away through advances in manufacturing, engineering, materials, design, and the fact that SUVs these days are mostly city vehicles.
Body on Frame

This feels as if its in its natural habitat
Unibody

Its normal to wince seeing this Range being "abused".
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Stan Hanks
minor nit: the Range Rover was body-on-frame until 2002. ...
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Steve Blumenkranz, Mechanical Engineer
Answered Oct 7, 2014
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Many SUV's have gone over to unibody. Body on frame is a hold over from the truck chassis based origins of SUV's. This goes all the way back to PowerWagon battlefield ambulances and the WC53 Carryall followed by the IH Travelall and the Chevy Suburban as the class evolved along with American lifestyles over the decades since WWII.
.

WC53 Carryall.

PowerWagon ambulance.
But, despite its hardy origins, the truck chassis has the same disadvantages in a SUV as it does in a car in terms of manufacture, chassis flex, handling, etc. so it is on the way out. In the Carryall, you can see what led to the panel truck and later to the Econoline van and others like it in a different branch of the model tree.
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Stan Hanks, cars: catch and release: 232 and counting
Answered Oct 7, 2014
Continue Reading
Off-road performance types -ranging from dudes with six-packs and shotguns that read too much "Off Road Magazine" to guys that really run Moab and The Rubicon - have a preference for body-on-frame. Several reasons
1) "body lift kits" - you can essentially put spacers between the body and the frame to inexpensively get more clearance for larger tires, and in theory put your body further away from potentially damaging rocks.
2) ease of making significant suspension changes. Welding to thick-wall steel frame members is a whole different thing, easily done by most fabricators, relative to relocating suspension pick-up points on unibodies. Not that it can't be done, but it's a completely different skill set and price point....
PLEASE :-MARK AS BRAINLIST
Body on frames are incredibly tough. In offroad conditions the body of a vehicle is forced into different orientations, often at the same time, as the vehicle navigates the uneven terrain. The frame (which the body is bolted to) has a far high torsional strength than unibody vehicles. The frame takes most of the punishment. A unibody will require a fair bit of engineering to deal with the stresses the body will be subjected to. Interestingly, the Grand Cherokee is a very capable unibody but has a front and rear frame.
A single frame can support a lot of different body types, allowing more variations with reduced costs.
It is easier to repair the body-on-frame vehicle as parts are replaced as needed. A unibody is typically safer because the whole body is designed to absorb the forces of impact, but that means more extensive damage and in some cases the integrity is compromised.
While some unibody SUV are decent tow vehicles, they are usually of the premium variety. And they have relatively lower towing limits. Anything upwards of 10k kilograms, and you will need a proper body on frame truck.
Some body-on-frame vehicles intended to take a beating as a matter of course include:
Land cruiser (and the Lexus variant)
Patrol
Hilux
Expedition
Yukon
Escalade
Wrangler
Any pickup truck
Some unibody SUVs/Crossovers
Range rover
Grand Cherokee
CRV
RAV 4
Highlander
Murano
Pilot
Santa Fe
As one can probably tell from the list, the unibodies are not principally work horses.That said, a lot of the advantages of body on frames are being eroded away through advances in manufacturing, engineering, materials, design, and the fact that SUVs these days are mostly city vehicles.
Body on Frame

This feels as if its in its natural habitat
Unibody

Its normal to wince seeing this Range being "abused".
46.4k Views · View Upvoters
Your response is private.
Is this answer still relevant and up to date?
Upvote · 21

Stan Hanks
minor nit: the Range Rover was body-on-frame until 2002. ...
Promoted by UpGrad.com
Post graduate diploma in Machine Learning and AI with IIITB.
Learn classification algorithms, deep learning, NLP, reinforcement learning and graph models with UpGrad!
Learn More

Steve Blumenkranz, Mechanical Engineer
Answered Oct 7, 2014
Continue Reading
Many SUV's have gone over to unibody. Body on frame is a hold over from the truck chassis based origins of SUV's. This goes all the way back to PowerWagon battlefield ambulances and the WC53 Carryall followed by the IH Travelall and the Chevy Suburban as the class evolved along with American lifestyles over the decades since WWII.
.

WC53 Carryall.

PowerWagon ambulance.
But, despite its hardy origins, the truck chassis has the same disadvantages in a SUV as it does in a car in terms of manufacture, chassis flex, handling, etc. so it is on the way out. In the Carryall, you can see what led to the panel truck and later to the Econoline van and others like it in a different branch of the model tree.
18.8k Views · View Upvoters
Your response is private.
Is this answer still relevant and up to date?
Upvote · 5
Comment...

Stan Hanks, cars: catch and release: 232 and counting
Answered Oct 7, 2014
Continue Reading
Off-road performance types -ranging from dudes with six-packs and shotguns that read too much "Off Road Magazine" to guys that really run Moab and The Rubicon - have a preference for body-on-frame. Several reasons
1) "body lift kits" - you can essentially put spacers between the body and the frame to inexpensively get more clearance for larger tires, and in theory put your body further away from potentially damaging rocks.
2) ease of making significant suspension changes. Welding to thick-wall steel frame members is a whole different thing, easily done by most fabricators, relative to relocating suspension pick-up points on unibodies. Not that it can't be done, but it's a completely different skill set and price point....
PLEASE :-MARK AS BRAINLIST
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