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  #1  
Old June 13th, 2014, 08:55 PM
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Default Autolite 2407 have we been running the wrong plugs all along?

Well the M715 seams to have fouled a plug as it has been a little sluggish since the memorial day parade so I figured I would change them to see if that picks it back up. Well I pulled the Autolite 2344's out and went to in stall the spare set I thought I had only find out they are spares for the Dodge M37 I have. So I went to order a new set from Napa online and just wanted to check things out real quick and everything here on the Zone says to use the 2344 but I found a chart on the M38 site that list the proper plug as being the 2407.

And it shows that the heat range is much higher in the 2407 than the 2344 but that they are the same 14mm 1/2" reach.

So I looked and Napa does carry them at the same price as the 2344 but in the pictures the 2407 look like they have a slightly shorter body than the 2344. So I ordered them and we'll see when they get here how they compare. And if I get a chance, I will pull one from the M725 which still has the same plugs in it since it was in service with the Army. (My M725 was a rare Army keep, as it was in use all the way up to 1994 when it was surplused) I found a few references here on the Zone about the 2407 but no one ever answered about them, so we'll see if we have been running and recommending the wrong plugs all these years.
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Old June 14th, 2014, 01:10 AM
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I looked this up not long ago just for the heck of it.

See this thread
Hot plugs - cold plugs?

There are a few cross references there listed, but the 2344 and 2407 are lsted there in some of the charts.

http://www.autolitecatalog.com/PartD...px?b=A&pn=2344

The jegs chart listed seems to have disappeared from the previous thread... it was the specs for the 2407 and the cross references...
I'm sure its still on JEGS somewhere... but the link is boken now for some reason.

The AER72S is a Motocraft plug, and cross refereneces to an Autolite 2407: Rboltz recommended the motocraft plug with this number ( still a 2407 when crossed )
http://www.autolitecatalog.com/PartD...px?b=A&pn=2407

16 bucks a plug? ouch.
http://www.jegs.com/i/Autolite/417/2407/10002/-1
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Old June 14th, 2014, 05:38 AM
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Yes I had seen the other threads but in none of them has anyone actually run the Autolite 2407 plugs. I was looking for someone who had actually used them to see if they are infact shorter which will help with installing the plug wires on them. Plus the hotter plug should help with the fouling from low speed driving.

And Napa has them for only $7.99, I don't know why Jegs would list them for double that at $16.99. It makes it a real easy choice for someone, for where not to get them from. Once these come in and if they spec out correctly I will more than likely have my local Napa order me another set as I have a dealer account with them and should get dealer pricing.
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Old June 14th, 2014, 09:43 AM
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Mine is probably due let us know how it turns out
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Old June 21st, 2014, 07:16 AM
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Well I finally got conformation from NapaOnline that my plugs have finally shipped so sometime early next week I should have them and be able to compare the 2407 to the 2344. I was a little disappointed in napaonline as they showed the plugs were in stock, but infact they had to special order them from Autolite. So word of caution it will take a little longer to get the 2407s.
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Old June 22nd, 2014, 06:59 AM
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Default plugs

And the 2407 is about 7/16" shorter than the 2344, makes install much easer.
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Old June 23rd, 2014, 08:41 AM
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Quote:
Originally Posted by skyj View Post
And the 2407 is about 7/16" shorter than the 2344, makes install much easer.
That 7/16" would do it! I had problems recently, installing the 2344, due to the length.
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Old June 23rd, 2014, 11:26 AM
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Quote:
Originally Posted by rboltz View Post
That 7/16" would do it! I had problems recently, installing the 2344, due to the length.
Tomorrow when my plugs finally arrive, I'll take comparison pictures between the new2407 vs. the 2344 I took out.
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Old June 23rd, 2014, 02:43 PM
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Default Spark plug ID

Can anyone tell me what a auto lite ARL8S MS35908-3 fits. Thanks in advance.
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Old June 23rd, 2014, 08:05 PM
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Quote:
Originally Posted by cappy42 View Post
Can anyone tell me what a auto lite ARL8S MS35908-3 fits. Thanks in advance.
Sold for the 151 MUTT: Now Obsolete:
https://groups.yahoo.com/neo/groups/.../messages/3341

"" be careful as there are some people listing
the Autolite military plug ARL8S on e-bay as fitting the m-151
series ..while the thread is the same at 14mm, the ARL8S' reach is
7/16" instead of the 3/8" for the m-151 ""

http://www.jegs.com/i/Autolite/417/2...ductId=2861305

https://groups.yahoo.com/neo/groups/...ns/topics/2972

Here is a complete list of sparkplug #'s by mfr. goes from hottest
plug to coldest.. AUTOLITE: 2247,2246,2245,2244,2243,2242 CHAMPION:
XMJ20,XEJ12,XMJ17,XEJ8,XMJ14,XEJ7
AC:WR47,SR47E,WR46,SR46E,WR44/WR43,SR44E here are the original
military spec. no's also from hottest to coldest MS35909-3,MS35908-
1,MS35909-2,MS25909-1,MS35908-2 be careful as sometimes people have
been selling autolite plugs on ebay as m-151 plugs ARL8S.. thread
size is the same:14mm but reach is 7/16"..m-151 reach is 3/8" plugs
with the old autolite "AR" number are the obsolete #'s . Autolite had
most #'s on nationwide back order..a fresh batch has been released.
I've ordered and recieved 2245's from my local Carquest autoparts
house..Napa can get them also;but usually $2-3 more per plug than
carquest..hope this helps everyone...ED
MUTT KAHUNA
Message 2 of 2 , Apr 21, 2003
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Here is an addition to the sparkplug list..these are the obsolete #'s
for Autolite..in case you find or have older plugs..once again these
are from hottest to coldest: AR9S,AR8S,AR7S,AR6S,AR5S,AR4S
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