05:00:03am, Thursday, May 09, 2024
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2 1/2 gear for IH 1256
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smokin joe
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Can someone explain what I need to get to split 2nd and 3rd in my 1256.
I have the stock 1256 rear and trans in my tractor. 407 450 roosa 3lm 466 farm stock. too much power for H2 - not quite enough for H3, Other thought would be.... what can i do to increase cubic inches in my 407. have to have original block. Thanks!! |
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Re: 2 1/2 gear for IH 1256
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Registered: 09/22/2010 Posts: 33 |
May be a foolish thought, but will it lug it in H3 with your T/A back for the whole pass? Are there any problems with doing that??
It seems like the stock T/As cost you a lot of momentum in those higher gears. We have a similar setup with a lot of tire tread and have a tough time spinning out in H3. As for your engine, Blackstack would be a good guy to ask here. |
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Re: 2 1/2 gear for IH 1256
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Registered: 09/14/2009 Posts: 109 |
Pull the sleeves out,bore it a little and find some 429 pistons.we ran a set up like that for years.you can get any gear combination you want from atlas,allied,or other parts builders. |
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Re: 2 1/2 gear for IH 1256
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really
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I'm really confused how can you have too much power for 2nd but not enough for 3rd I've watched several guys pull in a 10 mph class then at other pulls they pull in 15 to 18 mph class then maybe even a open class and run road gear. The first time I went to a badgerland pull I kinda thought it was a joke 8 mph but I've seen several of those guys run 18 mph in open |
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Re: 2 1/2 gear for IH 1256
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Posts: 756 |
Depending on how setup is it can take LOTS of extra HP to run 2mph faster. |
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Re: 2 1/2 gear for IH 1256
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smokin joe
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i guess its not fair to say i have too much power for H2 but i can launch with the torque ahead, go down and spin it out with out pulling the t/a and never really pulling it down.
H3 i can get out there 280-290 but dont have enough juice to spin it out at the end. Blackstack - I can have up to 466 cubes and can run up to 3000 rpm. 2.6 in turbo. Want to keep the 407 as i feel like everyone has a 400 series. Fun to be different. |
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Re: 2 1/2 gear for IH 1256
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Posts: 590 |
The DT429 piston & stock stroke will get you 440 cubes, or you can go stock bore & have the crank stroked an extra 1/2" & be at 450 cubes. |
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Re: 2 1/2 gear for IH 1256
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Posts: 590 |
You have to have the original block, what about your cubic inches & your engine RPM? |
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Re: 2 1/2 gear for IH 1256
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Registered: 09/22/2010 Posts: 33 |
Would a 5.3 inch stroke add up to 466 at a stock bore? How much grinding needs to be done to make that go? |
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Re: 2 1/2 gear for IH 1256
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Registered: 04/03/2008 Posts: 134 |
I had a 407 with a 5.35 stroke in it. it takes some grinding but definitely the way to go |
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Re: 2 1/2 gear for IH 1256
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smokin joe
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Hey Kevin,
What crank did you have in that 407 to get to 5.35" stroke? They surely can't stroke it 3/4" can they??? Sounds like a great set up but my machine guy had kittens when I wanted a 1/2" of stroke. |
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Re: 2 1/2 gear for IH 1256
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We got one stroked .800" |
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Re: 2 1/2 gear for IH 1256
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smokin joe
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mind tellin where you had it done MG?
What other modifications do you have to make to make everything clear? |
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Re: 2 1/2 gear for IH 1256
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send me a private message and i will get a hold of you if you would like |
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