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71-73 front Bumper Schooling
#1
I know someone will chime in and set me strait!

I thought 73 was the first year for the 5 mph bumper and hence it is rubber in the front OK no prob.

I see 71 and 72 Mustangs with a rubber front bumper?

Can anyone sort this out?

Thanks
Paul

73 Grandé
351C 2v
Now 4v Carb/Cam/headers/T5


Gasoline is for washing parts.
Alcohol is for drinking.
Nitomethane is for racing!



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Last Update: 4/23/16

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#2
Well, yes and no. The '71s & '72s had body colored "urethane" (more like vulcanized rubber) bumpers on the Mach 1s, Springs, Sprints, and for special order as part of the Deluxe Exterior Group (I believe that's what it was called).

The '73s were the first year for the 5-mph bumper... which was "urethane" as well.

So you were right on both accounts. Wink Big Grin

Hope this sorts it out.

Eric

[Image: mach1sig2.gif]
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#3
Mister 4x4;191439 Wrote:The '73s were the first year for the 5-mph bumper... which was "urethane" as well.

Yep - and for the uninitiated: The '73 bumpers are noticeably bigger than the '71-72 bumpers, and they cover the lower valance entirely.

The '71-72 bumpers are almost flat, but the '73 bumpers stick out in the center and taper at the headlight/corners. The shape pattern is eerily similar to a 2005-2009 Mustang.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#4
It's not the rubber that makes it a 5 mph bumper. As all three years have some sort of rubber as you know. The 73 bumper is extra heavy and reinforced. Its backed up by a impact absorption assembly. The 71-72 uses the same stiff brackets as the chrome bumper.
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#5
All Mustangs in 71 & 72 came with chrome front bumpers as standard equipment, while Mach 1s came with the eurathane front bumper. As mentioned above, there were a couple of optional trim packages in 71/72 that included the Mach 1 style eurathane bumper also.

For 73, all cars sold in the US had to have 5mph front bumpers and 2.5mph rear bumpers, so the Mustang's bumpers for 73 reflected this change.
The new 73 eurathane front bumper was then included on all models...no chrome front bumpers on any 73 Mustangs.
The rear bumpers on 73s are the same as 71/72, yet are mounted an inch or so farther away from the body with some rubber spacers to hide the gaps.
Many people are mistaken about what a "5 mph bumper" is supposed to be designed to do...they think it should withstand an impact up to 5mph with no damage: not true.
The regulation was that a direct frontal impact of up to 5 mph could not damage any critical or functional part of the car...cooling, steering, engine, etc...
There is no regulation as to cosmetic damage.

I remember when the 73s were new, the new HUGE front bumpers combined with the 14" wheels/tires on the Mach 1 made the car look badly proportioned to me, I hated them.
But they grew on me and now they look just fine to me.
I had the same reaction to the new 79 Trans Am front end when it was new...I thought it was horrible.
But it grew on me...I love them now.
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#6
Kit Sullivan;191462 Wrote:All Mustangs in 71 & 72 came with chrome front bumpers as standard equipment, while Mach 1s came with the eurathane front bumper. As mentioned above, there were a couple of optional trim packages in 71/72 that included the Mach 1 style eurathane bumper also.

For 73, all cars sold in the US had to have 5mph front bumpers and 2.5mph rear bumpers, so the Mustang's bumpers for 73 reflected this change.
The new 73 eurathane front bumper was then included on all models...no chrome front bumpers on any 73 Mustangs.
The rear bumpers on 73s are the same as 71/72, yet are mounted an inch or so farther away from the body with some rubber spacers to hide the gaps.
Many people are mistaken about what a "5 mph bumper" is supposed to be designed to do...they think it should withstand an impact up to 5mph with no damage: not true.
The regulation was that a direct frontal impact of up to 5 mph could not damage any critical or functional part of the car...cooling, steering, engine, etc...
There is no regulation as to cosmetic damage.

I remember when the 73s were new, the new HUGE front bumpers combined with the 14" wheels/tires on the Mach 1 made the car look badly proportioned to me, I hated them.
But they grew on me and now they look just fine to me.
I had the same reaction to the new 79 Trans Am front end when it was new...I thought it was horrible.
But it grew on me...I love them now.
IT's funny how that works there were many cars in the 70s I thought were ugly and now I love them.

Going fast is fun but life is short so slow down and enjoy the ride Big Grin Frank
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#7
Do you know how many times I've seen a 71-3 bumper for sale that is actually a 73 only? I try telling the seller but they never listen.


Sent from my iPhone using Tapatalk
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#8
I know your right. It's not just bumpers, a lot of people think 71-72 and the same as 73s but there were a lot of subtle design changes in for 73 some are interchangeable and some are not so much.

Going fast is fun but life is short so slow down and enjoy the ride Big Grin Frank
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#9
Mister 4x4;191439 Wrote:Well, yes and no. The '71s & '72s had body colored "urethane" (more like vulcanized rubber) bumpers on the Mach 1s, Springs, Sprints, and for special order as part of the Deluxe Exterior Group (I believe that's what it was called).

The '73s were the first year for the 5-mph bumper... which was "urethane" as well.

So you were right on both accounts. Wink Big Grin

Hope this sorts it out.


It is called the 'Décor Group'. Big Grin

http://www.7173mustangs.com/thread-decor-group-71-72-73

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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#10
It is funny when we go to the Good-Guys shows. The cars are 1972 and older but some people bring their 73's (including us when we bring out our Cougar). All of the 73's stand out like sore thumbs with the front bumpers sticking out but no one gives us any grief about it



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