Which tranny to use?

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Figure8racer5
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Which tranny to use?

Postby Figure8racer5 » Wed Jul 20, 2011 8:21 pm

I race a 93 beretta on the figure 8 and oval. It has a built 3.1 with 10.5/1 compression. I am needing to know what is a good automatic tranny to run in it on a 1/4 mile oval track in 2nd gear. I need to get off the corners hard and pull all the way down the straightaway



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Re: Which tranny to use?

Postby Money pit Beretta » Wed Jul 20, 2011 9:10 pm

3T40. The 4T60's 2nd gear sucks unless you want to come out of the corner slow and build up to a high top end. Do to how short that track is I don't think it's a good idea. What can you use for a FDR? Is there a limit?


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Re: Which tranny to use?

Postby 3X00-Modified » Wed Jul 20, 2011 9:45 pm

4t60e is 1.56
3t40 is 1.60

The biggest problem he would have is he can't control the 4t60 unless he got a pre 94 non E version, but even then its extra weight for nothing since he'll never use 4th gear.

And his biggest gain would be to get the 33/37 chain setup that I'm running so he has a better final drive. That takes a typical beretta from 2.96 or so all the way to 3.73 final... bumping your effective 2nd gear from 4.73 to 5.96



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Re: Which tranny to use?

Postby Asylum » Thu Jul 21, 2011 12:44 am

I have a 32/37 gear set for a 3t40 (th125) if you need one.

Make it a 3.73 and there would be no looking back.


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Re: Which tranny to use?

Postby Figure8racer5 » Thu Jul 21, 2011 8:33 am

What would the tag read on the tranny to find one with the 33/37 setup or what car would that come factory in and if it helps any... The thundercars run a 4.56 in 2nd out there but it may be different for the FWD idk. Im new to the beretta. I would usually run hondas. Lol. But sounds like you guys know your stuff so im goin with you info!!!



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Re: Which tranny to use?

Postby Figure8racer5 » Thu Jul 21, 2011 10:04 am

I am interested in the 33/37 setup. How much u want for it. And where are u located



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Re: Which tranny to use?

Postby 3X00-Modified » Thu Jul 21, 2011 1:44 pm

Asylum is: Hamilton, Ontario, Canada

I'm not sure which 3t40's came with that setup.



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Re: Which tranny to use?

Postby Asylum » Thu Jul 21, 2011 3:06 pm

I think I paid $125 for it.

I'll have to look.


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Re: Which tranny to use?

Postby Figure8racer5 » Thu Jul 21, 2011 4:33 pm

I talked to a guy that runs out there and he said that the 373 setup would cause the car to over rev. He said the car already has a 33/37 sprocket in it and the one that use to be in it was a 35/35. Is there anything inbetween or should i just give it a shot the car just seems a little sluggish right now



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Re: Which tranny to use?

Postby 3X00-Modified » Thu Jul 21, 2011 7:25 pm

What ratio diff is in it right now and what mph do you hit on the straight as well as what torque converter are you running?



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Re: Which tranny to use?

Postby Figure8racer5 » Thu Jul 21, 2011 7:34 pm

Its the stock converter out of a 87 cav. Theres no dash in the car to know the speed. He said it was turnin about 7800 when he ran it there last but it just doesnt seem as snappy as the stock tranny that was in the car when i first sold it to him... They rebuilt the motor and swapped the tranny for the figure 8 but i want something for the oval as well



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Re: Which tranny to use?

Postby 3X00-Modified » Thu Jul 21, 2011 8:06 pm

7800 wtf does your cam even make power up there? Most 3.1's choke after 6 even built due to shitty flowing intakes



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Re: Which tranny to use?

Postby Figure8racer5 » Fri Jul 22, 2011 11:11 pm

He said its a 2350? Converter. Does that sound rite. Like a 2800 stall.... Have u herd of using A chrysler tranny from a 2.5? Thats what im tryin to do tho cuz its recing toooo much and im runnin out of cam and gear



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Re: Which tranny to use?

Postby KFLO 93 GT » Sun Jul 24, 2011 2:05 pm

7800 would be a ridiculous rpm to turn on a 3.1 engine, even with a cam, compression and porting the powerband is going to fall on it's face after 5500 rpm.

What are the class limitations? If a 5 speed is an option, that gets my vote. Swapping them isn't hard if you have a donor car.


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Re: Which tranny to use?

Postby beretta » Sun Jul 24, 2011 11:39 pm

33/37 setup

What exactly is this ?? lol

Im interested in making my 3t40 in my Z less sluggish off the line




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