Anonymous-0

Well-known Member
Would a U with a 403 hang with a 560 with a 301? How heavy can the rear ends take? We pull 6500 to 9500 here. How would one do in these weight classes ?
 
at the same rpms the moline will out pull the 301 560. we got a 403 moline and in 2rd gear it will pull up to 7000 easy, it will spin out a set of 18.4x38 full cuts in 3nd at 2100 rpms
 
YES!!!!! Now that I have made the IH owners mad; there are a lot of variables to consider. If a 301 will spin out in those classes; a 403 should, too. There is a lot of difference in sleds; tracks etc... in various parts of the country. If you plan to pull that heavy; why not consider a G or GB. They have a 403 and you will not have to throw as much weight. My Us generally go 5-5500#. Do you really want to throw 2 TON of weights??
 
i had a 460 with a 301 at 2500 rpms and in 2nd gear it wouldnt move the sled. i was told it had to be around 3500 rpms to pull in 2nd gear.needless to say i went back to the molines quick.
 
What weight class and what kind of track was it that the 301 IH wouldn"t move the sled. I am a little skeptical of that, but yes the Moline should be way better with 100 more cubic inch that's a no brainer.
Thanks,
Jim
 
Put a RD450 in that IH against that 403 Moline then we're talkin apples to apples an red aint a bad color.
Jim Henke
 
Is a gb a better puller though? I've heard people say taking a propane gb and converting it to gas will get you a hundred horsepower. That true?
 
What rpm's? Stock, 10%, unlimited? Down low go yellow. Up high probably go red, I've never seen a U at 4-5,000 rpms. T/A gives you more gearing options unless you remove it. Have never seen a Moline rear break.
 
YES!!!! Take a GB lp with 4210 heads (very common) and put it on gasoline and it will dyno 85-100 plus hp (depending on how many rpm you turn). I have had several do 90-95@ 1700-1800 rpm. Most pullers use a U chassis since it is lighter. If you are planning on pulling the heavy classes; don"t see a need to have a lighter tractor and have to weight it down. Had a U w/stock 403 and 4210 heads a while back; took out the gov. stop and it did 106 hp@2600rpm. (did NOT run it there; just curious)
 
it wouldnt move it on any track at any time in 2nd gear. i had it for a few pulls and in first gear it would pull ok but i was told it would pull 2nd gear . mine was 4100 lbs empty. i finally got it to pull in 2nd at 4500 lbs but that was it at 2500 rpms. if i was going to spend the money i would go with the u moline. i have had a 403 and i am putting a 403 in a ub right now. it will pull second gear at any rpms. you can run it at 2500 if you got aluminum pistons in the 403 but it will do just as good at 2000 to 2200 rpms.
 
i pull a G moline with ta 403 with a overbore in it and it weighs 5100 and would pull 5.5 mph in second gear on a heavy sled. i run 16.9x38 on it now but going with 18.4x38 later. im going to lighten it up to 4500 lbs hopefully here soon.
 
Thanks for the info. Sounds kind of strange to me though. Even at 2200 RPM it should make enough power to pull second gear. Have fun with you Moline whichever one you end up with. They are good pullers.
Jim
 
I pull a 403 UB in 5500# and 6000#. It makes 98hp on the dyno with much room for improvement. It used to handle 3rd gear with 15.5 on longer chains. It has 16.9 now, and competes in 4&5mph classes along with the hotter stuff like Baker 436 engines, although not near the power. Here's the setup (413 cubes):

.060 over aluminum pistons
10A4210 heads
G carb with M670 1.06" venturi
M670 Y intake and M670 exhaust
Berry's 403 pulling cam
I run up to 1800rpm but holds 98hp much lower.
Using M&W or 4.81 pistons would help. The carb is a little small and heads should be 104231.

The next one has a little manifold/carb mod & 10A4231 heads with a 4.75 bore and pierce governor. It's not installed yet, but 115 hp would be nice.
 
i bought that 460 for 600 and it was running. tore it apart and put the 301 gas in it and lightened it up and ruined a good tractor. then when i sold it lost money on it from all the modifications and money i put in it to lighten up. wont make that mistake again.
it was a good running diesel.
 
Mopower how high can you rev a 403 without them blowing up? Do the aluminum pistons really help wake them up? I kinda like the idea of a stout gb beating up on 4020's, lol
 
301 came from factory at about 90HP. With a some head work and carb work 110Hp is easy to get. If you couldn't pull 5500 in second something was wrong with your motor. I pull against one with no stroke and probably a lot of head manifold and cab work and he pulls 3rd on some good clay tracks.
 
I'm not the one to talk to about rpm. I'm guessing it would handle up to 2500. Feeding it enough air is the issue. There is really no noticeable difference between a U & G rear end. They are fairly interchangeable. There are different gears and such, but dimensionally, they are the same. A G looks tougher, but a U is lighter. Early U tranny housings are the lightest.
 
How about that JD A "Barn Burner" seen him go 7500# and can't remember him ever runnin out of power. Trapper
 
You can rev them all you want. I don't know why you would want to tho. The springs are worn out in all these pos stock tractors and half the pullers.
 
how many rpms was he turning, i was trying at 2500 to be legal in our rules. all the other guys i talked with said they were turning 3500 to 5000 rpms.
 
no more red ones at my place only prairie gold coming this way. lots of differnet parts to interchange to make big cubes with
 
Sorry I didn't really answer your question. We are allowed 20 percent over around here and I know he is not running much more then 2500 3000 max and I think he is under 3000.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top