Replacement belts Chrysler 300 1970

Engine, Transmission & Driveline

  1. drrock

    drrock New Member

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    Hey friends!
    I have a 1970 Chrysler 300 w/ power steering and air condition. I´m looking to replace the 4 belts (engine).

    As far as I can see the belts that are mounted right now are:

    2 x NAPA Premium XL 25-7590
    1 X NAPA Premium XL 25-09283/7365
    1 X MOPAR 04027331 30114 420892

    What replacements do I need and what would you recommend?

    THX in advance, stay safe!!
     
  2. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

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    I would recommend running Goodyear Gatorback belts which are now renamed Continental Elite..
    They fit better in the grooves and no squeal.
    Make sure you do not overtighten them and allow some deflection (less than 1/4 inch IIRC) .
    Check with any local parts jobber that can supply Continental aka Goodyear belts.
    The part numbers you listed the jobber can use as cross reference. Makes their life easy as most counter guys were not even born when your car was built lol.
    Hope this helps.
     
  3. drrock

    drrock New Member

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    Hey!
    Thank you for this!
    Unfortunately I am in Germany and can´t just walk in the parts shop asking for US parts... :(
    They wouldn´t understand what I´m talking about at all!!
    So what I would need are parts numbers/manufacturers whith which I can order from Rockauto or Summit.
    THX again!!
     
  4. Trace 300 Hurst

    Trace 300 Hurst Professional Tinkerer FCBO Gold Member

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    I use these NAPA high quality belts. Cost is nearly $100USD, but as cbarge indicates above, cheap floppy belts are very bad for the long distances between the pulleys, especially from the Alt to the AC compressor. Cheap belts (for about $25USD) flap like crazy and will simply jump off the pulley at higher revs or when the AC clutch engages.

    These are for the 1970 440 TNT.
    NAPA Premium XL Belt
    #7590 AC belt (2);
    #7425 PS;
    #7360 Fan

    You should be able to cross-ref with these numbers.
     
  5. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    Rock Auto has the Continental belts that @cbarge has mentioned.
     
  6. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    Rock Auto will list the belts by application. If you want to double check, type in the numbers listed on Rock Auto into the NAPA website and that should bring up your belt numbers (although, I never tried that)
     
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  7. shooter65

    shooter65 Senior Member FCBO Gold Member

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  8. drrock

    drrock New Member

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    THX 2 all!
    If 440TNT and 440 use the same belts I'll order the NAPA stuff.
     
  9. CBODY67

    CBODY67 Senior Member

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    ONE side issue with v-belts, their WIDTH and how it relates to the LENGTH of the belt. IF what's on there works well, MATCH THAT LENGTH AND WIDTH specifically, rather than going into a parts catalog by application--period. USA or European belts should not matter, I suspect. Might need to convert the USA measurements into Metric dimensions, I suspect.

    Here's why it's important to do that. Many of the USA manufacturers would specify a .375" belt width "in production". That relates to how low the belt rides in the groove while maintaining the length needed for adjustments and such to ensure no slippage. In the case of GM belts back then, the replacements in the parts books generally were .440" wide belts, which made them ride higher in the groove, but at the same length as the .375" wide belts, they usually didn't work well. The general rule of thumb I developed when trying to make a .440" wide belt fit where a .375" wide belt originally came, was to take the length of the .375" wide belt and add 1" to the length. THEN it fit as desired! Because the higher in the groove the belt rides, the slightly longer it needs to be to have the adjustments happen in the same place on the bracket.

    The belt size specs should be marked on the belt itself, in ink or imprinted, usually. If not, just physically match it. Use the catalogs for a cross-ref, but DO stretch the old and new belts out to make sure they are the same WIDTH and LENGTH before installing.

    A quality belt is important. Many of the less expensive once (even from a name-brand company) can stretch and not last as well as their premium products. The Gates Green-Stripe belts rather than their less-expensive Charter line, for example. Strength of the innards plus the rubber compound itself are different. Yet they will work fine for a while. Key words, "a while".

    It sued to be that the a/c belts were "matched" and sold only in a "matched pair". There are some production codes on the belt which verify that. In later times, it seems that they are now sold in singles.

    Allegedly, the "matched pair" was necessary as they both ran together on the same pulleys, so they had to be from the same batch for a better match of characteristics. Their "flex" during certain engine rpm and a/c compressor operation are obvious, so it was felt they should come from the same production batch, rather than being from different batches for best results. That's how it was when the cars were new, for any Chrysler double-belt on the a/c compressor and alternator.

    From my experiences,
    CBODY67
     
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  10. volksworld

    volksworld New Member

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    just as another angle...a 7590 belt is a 3/8 wide x 59 inches...a 7365 is 3/8 x 36 1/2 inches...so if you wanted say a continental belt 59 inches is 1498.6 so i'd try a 10x 1500....36 1/2 is 927.1 so a 10x 930....i'm seeing some applications calling for a 36 instead of a 36 1/2 so maybe a 915 or 920...the ps should be a 42 1/2 or 1079.5 so 10x1080....10 mm is a little wider than 3/8 so go to the higher number in length...usually conti's come in 5mm increments so you may have to go a little longer
     
    Last edited: May 24, 2020 at 9:27 AM
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