birfield eliminator worth eliminating?

[Bucknasty88]

hey so i was checking out marlins and was wondering if the eliminator kit was worthwile? i have heard that birfields break oodles if you got lota power or whatever. so is it worthwile to grab it or should i just throw a few birfields in the tool box?

[RockCrushinToy]

if you really dont want to break anything get bobby longs 30 spline longfields, those are the toughest birfields on the market

[mallkrawler]

I wouldn't think that a Dana 44 U-joint would be much stronger than a Birfield. I've broke several. But have only broke 2 Birfields. I think you'd be way better off to buy some 30 spline Longs for a tad more money. And never worry about the front axle again... That is, untill you break R&P gears.

[BigDaddy]

I had the Warn kit, I got it when it first came out spent $1,000 on it. It was like taking $100 bills and putting them in the Fire. Bobbys upgraded longs are way better than that kit, and if you really want the wow factor go for the 30 spline. I also sent my R&P to him and had them treated.....so far so good.

[keyice]

word of caution on this topic, when you build stronger then your next weakest link is the thing that will break, dana 44 u-joints are weaker than birfeild, if you make the bir stronger next thing that seems to break is the long side inner, so you upgrade to cromoly, ring and pinion is next, my friend has the 27 spline cromoly kit, 42in tires, dual cases, 350 hopped up on propane with 410 gears, he hasn't broken a 27spline cromoly set yet, I would recommend it over the 30 spline for 2 reasons, one you can replace a blown birfeild with a stock one in a pinch, and to the 30 spline uses 4340 cromoly verse 300m. 4340 isn't as strong as 300m on a metalurgy scale in large cross sections such as axle shafts, also use a good ring and pinion set much harder to set up gears on the trail or swap front thirds than pulling one side apart to swap a birfeild

[BigDaddy]

he hasn't broken a 27spline cromoly set yet, I would recommend it over the 30 spline for 2 reasons, one you can replace a blown birfeild with a stock one in a pinch, and to the 30 spline uses 4340 cromoly verse 300m.

Wow thats cool your buddy has 300m shafts were in the hell did get a set of those? The set up Bobby sells are listed below with test results.

The Longfield itself is 4340 and that stub shaft failure is the same as the 30 spline 4340 shafts. I think the 27 spline is the same set up as the 30 spline. They both use 300m cages, and both have 4340 shafts. The only diffrence is the 30 spline has three more splines on it. I am not sure if the balls in the 30 spline are smaller, you cant go wrong with the 27 or 30. I carry spare longs and shaft just in case. .


Stock Birfield= 3,700 ft lbs
Birf Eliminator kit= 4,020 ft lbs
Stock inner shaft= 4,360 ft lbs
Longfield stock treated birf= 4,800 ft lbs
Superior 27 spline 4340 chromo inner axle= 5,200 ft. lbs
Longfield 27 spline 4340 chromo inner axle= 6,820 ft. lbs
Longfield 30 spline 4340 chromo inner axle= 8,200 ft. lbs
Longfield 4340 birfield stub failure= 8,200 ft. lbs
Stock Dana 60 35 spline= 8,300 ft. lbs

[Longfield]

word of caution on this topic, when you build stronger then your next weakest link is the thing that will break, dana 44 u-joints are weaker than birfeild, if you make the bir stronger next thing that seems to break is the long side inner, so you upgrade to cromoly, ring and pinion is next, my friend has the 27 spline cromoly kit, 42in tires, dual cases, 350 hopped up on propane with 410 gears, he hasn't broken a 27spline cromoly set yet, I would recommend it over the 30 spline for 2 reasons, one you can replace a blown birfeild with a stock one in a pinch, and to the 30 spline uses 4340 cromoly verse 300m. 4340 isn't as strong as 300m on a metalurgy scale in large cross sections such as axle shafts, also use a good ring and pinion set much harder to set up gears on the trail or swap front thirds than pulling one side apart to swap a birfeild

NO we don't have any 300m shafts. The 27 & 30 spline inner shafts are 4340 chromoly. The 27 & 30 spline birfs are the same they both have 300m inner race. If hes running 42s on the 27 spline inners he will most likely break an inner shaft. That why we make 30 spline for the larger tires.
We also treat ring & pinion it makes them much stronger.

OUR LATEST TESTING
Birfield Eliminator Broke at 5000 ft.lb.
27 spline 4340 chromoly inner shaft 6800 ft. lb.
30 spline 4340 chromolyinner shaft 8900 ft. lb.

[BigDaddy]

Birfield Eliminator Broke at 5000 ft.lb.
27 spline 4340 chromoly inner shaft 6800 ft. lb.
30 spline 4340 chromolyinner shaft 8900 ft. lb.

I guess I had old Data..... The 30 spline is Even stronger!!!! WOW

[keyice]

I stand corrected, longfield would know they are his parts, I do know that 300m is much stronger the 4340 cromoly, could have swore he told me the inners were 300m might have been the bells on the birfield. He still hasn't broke an any of the 27 spline kit since he installed it. only thing that Jay has broke lately was the 23 spline input shaft on the second t case and that guy is kind of a throttle junkie with three years of abuse before that broke

Also the other downside to the elimitantor kit is how do you grease the u joints.

[BigDaddy]

only thing that Jay has broke lately was the 23 spline input shaft on the second t case

Did he brake his first one in Colorado a few years ago, or was that his output shaft? Big Black Truck?

[keyice]

got a wife from colorado, had lots of different land cruisers, AF guy that is him, lives out here in vacaville, haven't talked to him in awhile depolyed last I heard.