[78w72]

quick question regarding different metal types for trans or rear yokes. im slowly shopping around for a new 1350 driveshaft & have seen different materials for yokes & curious what the difference is as far as strength. ive pretty much decided on a strange cromo shaft & will probably buy their forged cromo yoke to go with it....

but my question is i see different material names like forged, cromo, "billet" & the OEM type cast or nodular iron. i know the nodular iron is stronger than standard cast but what are the differences or advantages between cromo & "billet"? speedmaster has a billet 1350 yoke for a very good black friday price of $57 & off black friday its $95, vs the strange cromo for closer to $200. my local driveline shop also sells a billet 1350 yoke from naepco(sp) for a little cheaper than the strange yoke. i asked them what billet actually meant & didnt really get a definite answer but he said he doesnt think its cromo.

so what material is better & is the strange cromo needed for my application & worth almost double the billet yoke? this is for a 500+hp low 11 second street strip car that runs drag radials & may dip into the high 10's. been using a stock th400 yoke from a 74 firebird on a new 3" DOM steel shaft but its time for an upgrade.

https://www.speedmaster79.com/GM-TUR...0-U-Joint-V2.0

[grivera]

I bought the Strange CM 3” driveshaft ($279) and 1350 forged slip yoke for $179. Keep in mind if you intend to ship a slip yoke to Strange for install on their shaft it’s an additional $40 plus the cost to ship.

[78w72]

thanks for the info on shipping a yoke to strange, in my emails with them regarding options to build a shaft they didnt mention a $40 fee to use another yoke, just that it needed to be shipped to them. wonder why they charge $40 to use another yoke?

any input on CM & forged vs billet? which one is stronger?

[steve25]

Forged is stronger then a billet.

[78w72]

ok, so forged is stronger *than billet... but what exactly is billet? & is cromo forged or a different metal than billet?

just confused & curious what billet means & what the differences are in the metals used.

heres the definition of billet as far as metalworking goes, notice how it says "forged".

Metalworking. a comparatively narrow, generally square, bar of steel, especially one rolled or forged from an ingot; a narrow bloom.

[grivera]

Originally Posted by 78w72

thanks for the info on shipping a yoke to strange, in my emails with them regarding options to build a shaft they didnt mention a $40 fee to use another yoke, just that it needed to be shipped to them. wonder why they charge $40 to use another yoke?

any input on CM & forged vs billet? which one is stronger?

I assume they charge $40 as an incentive for you to buy their part. Here is an email they sent me - reiterated by phone:

“You could send your yoke in, there is a $40.00 charge to use your yoke. We will need you to fill out the driveshaft order form to place an order. Once you have that info you can call into sales 800-646-7618 and someone can help you with an order and issue an RMA reference number to send the yoke in”
.

["QUICK-SILVER"]

Originally Posted by steve25

Forged is stronger then a billet.

What about 4340 cranks?

China forged vs. American carved

Just asking
Clay

[steve25]

A forging Is compressed by a huge amount of force to the basic shape it needs to and will have the grain flow of the steel the way it needs to run through the item for added strength.

Something made from a billet is machined from a block of steel and may or may not have the added strength of grain flow.

[78w72]

thanks. seems like most people prefer forged cromo for the yokes & shafts on higher HP cars.

aside from wondering what the differences in terms were, i mainly am trying to decide if a cromo yoke is worth 2x the price vs billet. & on the shafts for DOM steel vs cromo.

[hurryinhoosier62]

Originally Posted by steve25

Forged is stronger then a billet.

Not necessarily. Billets are
produced from a forging billet.

[67Fbird]

Chromoly is simply the "make-up" of the steel used to machine the finish part. There are MANY different "recipes" for steel parts all coming down to a few basic things. How HARD is it (Rc), STRENGTH (ultimate tensile strength) and TOUGHNESS (Charpy v-notch test)
Hard doesn't mean tough or strong. Strong doesn't mean hard or tough....lol it's like cooking REALLY. It's a blend of the three components to achieve the result that is NEEDED per the application. A drive YOKE is going to need to be a bit more on the TOUGH than on the hard and strong as it is absorbing a tremendous amount of SHOCK. Now with the internal splines, it will need to have some hardness to it so it maintains its shape and dimensional fitment.

Chromoly recipe has a high amount of .... molybdenum VS carbon.

[AG]

Use the forged chromoly trans input for your driveshaft, I did when I bought my Strange chromoly driveshaft and used a chromoly pinion yoke, all 1350.