466 in an International 766: Will the Rear End Survive? November 27, 2015 09:13AM
I'm thinking of building a 766 puller on 20.8x38 tires for the 10k+ lb farmstock classes. I'm looking at dropping a 466ci diesel in a 766 gas tractor.
Will the rear handle the power of a hopped up 466? (300+ horsepower)
How much power will the rear handle?
Should I be looking for a 966 or bigger instead?
Is the rear the same between any models? (766, 966, 1066, 1466)

Any info is greatly appreciated. Thanks!
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 09:25AM
There is 4.1s pulling with 706 reareds running over 2000 hp so I would say yes
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 09:50AM
That sounds promising, although I'm going to be using a stock rear. I'm guessing the 4.1 tractor has some upgraded parts in it?
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 09:53AM
It will for a while then you will seize your spider gears in the differential. It won't matter if it's a 7, 9, 10, or 14, they aren't built to last with that much hp. You will have to needle the cross in the diffential and it will last a long time. As 4.1 and beyond says, most of the big tractors are running 706 rears but they have been modified to take the power.
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 10:26AM
Might want to consider changing ring and pinion. 766 gas r+p plus 300 hp 466 plus 20.8x38 tires means pulling in

low side of transmission.
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 01:05PM
I completely disagree with you on that he will need to be in low range. I used to pull a 1066 with a stock 414, 11mm pump, and a 3lm out of box charger and pulled in high 2 and never had to pull the TA back. That was on both 18.4 and 20.8 tires. Was turning around 325 horse at rated RPM. I pulled in 10700 and 11700 farm stock class at 2849 RPM
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 01:30PM
1066 ring and pinion 13/51. 766 gas 13/49......jus' sayin'.
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 10:21AM
We can help you out with any modifications you would like to do.
Andrew 269-207-4184
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Re: 466 in an International 766: Will the Rear End Survive? December 07, 2015 02:16AM
We can do all types of mods or repairs. We don't have a website, but we do have a Facebook page, T High performance. With what you are doing you might want to look into having your differential needle bearinged. It will help keep you going in a straight line. We are located in South Haven, Michigan. Give me a call anytime if you need any pulling issues resolved. Thanks!
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Re: 466 in an International 766: Will the Rear End Survive? November 27, 2015 11:43PM
You won't have any trouble with the stock rear end until you start running high 3rd and road gear ! But I think u will be making more than 300 hp. most stock 466's are between 210 hp to 250hp from the factor so 300 should be easily accomplished! With a good fuel system and a decent turbo you should be able to make upward of 400hp! The stock 766 gas transmission and rearend will handle it just fine the stock clutch will not ! My advice is to go on and spend the money on a good sfi 3disc which I know is over kill right know but will save u lots of money in the long run, and will allow you to run a higher gear than the other tractor because u will be able to slip the clutch a lot more out of the hole and not hurt it . Do not change the ring and pinion the 13/49 will be the one u want and you will still be able to run in the high side with it ! High 3rd is the weakest spot in the Ih transmission so be careful when u start making Enough power to run that gear but until then have fun !!!!!
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Re: 466 in an International 766: Will the Rear End Survive? November 28, 2015 02:53AM
Thanks for all of the info and responses. I'm going to go ahead and see if I can get ahold of this 766 and put it together. (Already have the engine). I'll look into a larger clutch as well. Anymore info or responses, please send them my way!
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Re: 466 in an International 766: Will the Rear End Survive? November 28, 2015 01:32PM
I have a needled diff if you are interested. Seven 40-285-649 five
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Re: 466 in an International 766: Will the Rear End Survive? December 01, 2015 11:42AM
Track dirt type varies so much around the country,no one equation fits all,have pulled all over in many venues with half dozen different tractors,clay is rare,silty clay is not.
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Re: 466 in an International 766: Will the Rear End Survive? December 06, 2015 04:02AM
I have a 766 that had a gas and I put a d414 out of a 966 in it with a good fuel system and turbo and knock on wood no issues yet, still has as far as I know a stock TA! I don't plan on going higher in rpms so I just got a super heavy duty 14" pressure plate, 6 button clutch and stock flywheel and 20.8x38 and no problems yet pulling 250HP in 10500, 11000,12000 and 13000 5mph and 8mph. Also I still farm with this tractor and always plan to.

Disturbed mx Andrew what kind of mods do you have? Do you have a website? Location?
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Re: 466 in an International 766: Will the Rear End Survive? December 07, 2015 02:17AM
See above post.
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Re: 466 in an International 766: Will the Rear End Survive? December 07, 2015 11:59PM
Great info, thank you! This is pretty much exactly the setup/goals I'm looking at.
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