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11-27-2019, 07:05 AM | #1 |
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TH 400 1st gear?
Been "advised" much concerning correct 1st gear needs for my 3500 lb car with 5.14 gears and 30" tire, behind a decent BB chev Stocker and TH 400 trans. Any "rule of thumb" I should be using?
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11-27-2019, 01:42 PM | #2 |
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Re: TH 400 1st gear?
You didn't say if it's a Stocker, S/S or bracket car but the stock 2.48 is a good starting point. Keep in mind that we're racing at least 1/8 or 1/4 mile and not just to the 60'. A close ratio trans may result in a slower 60' time but due to less RPM drop on gear changes, could result in a quicker E.T. On the other hand a trans with a wide ratio, say a 2.75 for example may provide a quicker 60' but may fall down too much on the gear change. Converter stall also comes into this discussion as well.
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Jim Kaekel 3836 STK |
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11-28-2019, 08:24 AM | #3 | |
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Re: TH 400 1st gear?
Quote:
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11-28-2019, 12:38 PM | #4 | |
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Re: TH 400 1st gear?
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11-28-2019, 12:44 PM | #5 |
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Re: TH 400 1st gear?
What class and combo BBC?
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11-28-2019, 12:51 PM | #6 |
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Re: TH 400 1st gear?
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11-28-2019, 02:41 PM | #7 |
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Re: TH 400 1st gear?
Turbo 200 with 2.75 low, swap converter for one for a 200. Put the 400 in a pick up truck where it belongs. The fast big blocks are successfully run in 200s.
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12-17-2019, 06:54 PM | #8 |
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Re: TH 400 1st gear?
Not for nothing with the combo you're running you better adjust your budget or change combos. The price of a TH-200 is going to be one of your lesser expenses.
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Lee Valentine 1661 STK |
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12-03-2019, 04:45 PM | #9 | |
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Re: TH 400 1st gear?
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1) In your first post, you mention 5:14 rear gear. That's a bunch of rear gear for a car that should hit 125 MPH. You are going to need a really good BBC. 2) You stated that you already have the converter. The converter should be the last thing you buy, built to the finished engine/transmission/rear gear/tire combination. 3) There is a lot more to converters than stall. "K" factor, lock up potential, plus fin and stator design are all factors in the converters performance. 4) If you already have a real Kilgore, you already have an "expensive" transmission. 5) If you are looking at Coan, you are looking at an "expensive" transmission. 6) If your transmission was just open and your transmission guy could not tell what ratio was in it...well to be blunt, you need a better transmission guy. 7) If you have a real Kilgore, he has multiple ratios available. Disclaimer: These are my opinions and not be confused with facts or snobbishness.
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Dean Feiock -- Stock 5002 |
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12-18-2019, 09:41 AM | #10 | |
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Re: TH 400 1st gear?
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1) car runs 122 mph with old converter 2) Converter matched to all you've mentioned 3) Above my pay grade right now 4) This I know 5) Coan is on the way (when referring to "expensive" I consider $ 6500.00 and up to be expensive) 6) You are correct 7) Again, you are correct Disclaimer: When advised to get rid of my Motorhome Transmission, yes I considered that "snobby". Most of the replies I got were considerate/helpful as yours was. |
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