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Thread: Which tranny?
          
   
   

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  1. 06-05-2009 10:28 AM #1
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    jyardgirl
    jyardgirl is offline CHR Member
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    I would go with the 700 or the 400. the th350 could easily be damaged by the 450 hp.
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  2. 06-05-2009 10:37 AM #2
    BigTruckDriver
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    Whats the weight of the rod? Weeked cruiser or daily driver?
    Friends dont let friends drive fords!
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  3. 06-05-2009 12:03 PM #3
    mitchell.adams
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    Around 2900lbs, it's going to be a weekender, I was wondering if the 4th gear on the 700 was overdrive or not because of the 411. Thanks
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  4. 06-05-2009 01:56 PM #4
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    techinspector1
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    Here's a chart showing the gear ratios of all popular transmissions. With a 4.11 ring and pinion, the first gear on the 700R4 will be pretty much unuseable at 12.57:1, unless you're trying to climb trees with the car. The drop from 1st gear to second gear is pretty severe also, going from 3.06:1 to 1.62:1 on the gear change. So the motor would be screaming in 1st gear with the 12.57:1 final drive, then drop the r's way down with a 2nd gear final drive of 6.65:1. 4th gear overdrive final would be 2.88:1, so that would be ok for cruising.

    TH400 might be my choice for a weekend driver if I were not concerned with fuel mileage. It's a pretty much bulletproof trans that will give you a 10.19:1 first gear and a 4.11 final drive.

    http://www.oldengine.org/unfaq/leadfoot/trans.htm
    Last edited by techinspector1; 06-05-2009 at 02:05 PM.
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  5. 06-06-2009 07:19 AM #5
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    bentwings
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    I'd go with a Turbo 400 if you have room. I have a t-350 and 405 hp with out problems so far.
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  6. 06-06-2009 05:06 PM #6
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    JeffB2
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    Quote Originally Posted by techinspector1 View Post
    Here's a chart showing the gear ratios of all popular transmissions. With a 4.11 ring and pinion, the first gear on the 700R4 will be pretty much unuseable at 12.57:1, unless you're trying to climb trees with the car. The drop from 1st gear to second gear is pretty severe also, going from 3.06:1 to 1.62:1 on the gear change. So the motor would be screaming in 1st gear with the 12.57:1 final drive, then drop the r's way down with a 2nd gear final drive of 6.65:1. 4th gear overdrive final would be 2.88:1, so that would be ok for cruising.

    TH400 might be my choice for a weekend driver if I were not concerned with fuel mileage. It's a pretty much bulletproof trans that will give you a 10.19:1 first gear and a 4.11 final drive.

    http://www.oldengine.org/unfaq/leadfoot/trans.htm
    If He wants overdrive the 200R4 is not a bad choice,check out Art Carr's site also gear ratios are better spread than the 700R4.
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