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Thread: 3;73 or 4;10

  1. #1
    im gay as hell Guest

    Default 3;73 or 4;10

    which one is more popular and waht are there ups and downs for a 1987 5.0 t bird

  2. #2
    81T-bird Guest

    Default Re: 3;73 or 4;10

    Gonna depend on how much highway driving you do. If you had a 4.6 car I would say 4.10 no questions but for a daily driver w/ a 5.0 and auto my vote is for 3.73s.

  3. #3
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    Default Re: 3;73 or 4;10

    okay dude.
    a few things to think about. 373s are way more popular as specially on the street. on the dragstrip however 410s are going to be a better choice. more so for an AOD car than a t5 car.

    worthy of note is the 5.0 SO is all done at basically 4500 rpm. while you will feel alot more acceleration you will actually run out of motor. the HO is "good" for 6250rpm (rev limiter/redline)

    if you are thinking of gears id go with 373s. in fact the turbo coupe rear end im rebuilding is an 8.8 with 373s. im actually a little comcerned that they might be too steep for the street, highway and T5.

    again, i wouldnt realy bother with having someone install gears in a 7.5" rear diff. i would be more concerned with getting a 8.8 in there reguardless of the gearing.

    an 8.8 rear from an 86 older turbo coupe will be easier to install because it still has drum brakes. if you go with an 87-88 turbo coupe 8.8 you will have to convert to rear disks as well. this is alot more involved as specially if you want to keep the use of your e brake.

    if you can find a tbird sport in the junk yard (make sure its actually a sport) they at least have a traction loc rear diff even though its a 7.5" rear. the gearing in most of them is tall, 273 but apparently some of them had 308. the trac loc is a big improvement over the open diff version and should last awhile with an aod and mild engine.

    chances are though the junk yard is going to charge the same for a 7.5" as an 8.8"
    1988 Thunderbird Sport, Former 4.6 DOHC T56 conversion project.

    Rest of the country, Welcome to Massachusettes. Enjoy your stay.

    Halfbreed... Mango Orange Y2K Mustang GT
    FRPP complete 2000 Cobra engine swap, T56 n' junk...
    ~John~

  4. #4
    im gay as hell Guest

    Default Re: 3;73 or 4;10

    but if i install the 373 i should be faster than another tbird with out 373 or would i be able to peel out alot more than what i could know

  5. #5
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    Default Re: 3;73 or 4;10

    well, say if both cars are exactly the same other than the gears (373 vs stock say, 273) then the car with 373s will take off and speed up quicker then the car with stock gears. the car with the stock 273 gears will have a higher top speed.

    as far as peeling out, you probably have an open rear end now. if you keep it an open rear end then yes, it will peel easier. if you upgrade to trac loc even with the 373s you will have more traction. tires will be harder to spin.


    Edit:
    another classic thread
    Last edited by shame302; 04-10-2005 at 10:16 PM.
    1988 Thunderbird Sport, Former 4.6 DOHC T56 conversion project.

    Rest of the country, Welcome to Massachusettes. Enjoy your stay.

    Halfbreed... Mango Orange Y2K Mustang GT
    FRPP complete 2000 Cobra engine swap, T56 n' junk...
    ~John~

  6. #6
    Bird351 Guest

    Exclamation Re: 3;73 or 4;10

    Quote Originally Posted by shame302
    Edit:
    another classic thread

    Yer not kiddin'.

  7. #7
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    Default Re: 3;73 or 4;10

    I switched from 373s/t-5 to 355s/t-5 and when I had my aod I liked the 373s...

  8. #8
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    Default Re: 3;73 or 4;10

    I switched from 373s/t-5 to 355s/t-5
    yeah, ive been thinking the 373/8.8 i have to go in my birds gonna be a little steep. i dont use it as a daily driver at all but id like to be able to cruis at 65-70 easilly on the highway.

    were the 355s much different compared to the 373s, thay are so close...
    Last edited by shame302; 04-10-2005 at 11:59 PM.
    1988 Thunderbird Sport, Former 4.6 DOHC T56 conversion project.

    Rest of the country, Welcome to Massachusettes. Enjoy your stay.

    Halfbreed... Mango Orange Y2K Mustang GT
    FRPP complete 2000 Cobra engine swap, T56 n' junk...
    ~John~

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    Default Re: 3;73 or 4;10

    Quote Originally Posted by shame302
    yeah, ive been thinking the 373/8.8 i have to go in my birds gonna be a little steep. i dont use it as a daily driver at all but id like to be able to cruis at 65-70 easilly on the highway.
    Even 4.10s ain't nuthin crusing in OD/5th.... With the 5 speed, its 1st gear that is almost useless with about anything more than 3.55s, because of the deep 3.35 ratio of 1st.

    The Ford Racing T5 with 2.95 1st is a lot friendlier.






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  10. #10
    81T-bird Guest

    Default Re: 3;73 or 4;10

    With a 5 speed I'd probably go with 3.55's if I drive it alot. It'll get you a couple hundred RPM back.

    My buds who have road race/street cars, like 3.55 in the rear better than 3.73 because they aren't shifting in the middle of turns.

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