A833 4-Speed on a 4-500hp 440: 18 or 23 Spline Necessary?

Which Case do I need?

  • Cast Iron 23 Spline

    Votes: 12 80.0%

  • Aluminum 23 Spline

    Votes: 0 0.0%

  • Cast Iron 18 Spline

    Votes: 2 13.3%

  • Aluminum (was there any?) 18 Spline

    Votes: 1 6.7%
  • Total voters
    15
-
ToMang07

ToMang07

Well-Known Member
Joined
Feb 3, 2017
Messages
396
Reaction score
199
Location
Maine
Just need to be clear, I need to know what will work.

Will be going in a street car, nothing crazy but I eventually would like to get the motor into the 4-500hp range.

I know there are 2 different types of cases, aluminum and cast.

I know 23 Spline came on most everything except 440/Hemis, which had the 18 Spline.

Will a 23 Spline hold up to the abuse? And is there really that much of a difference between cast and aluminum cases?
 
I'm putting a 23 spline iron case behind my 383, maybe 450 hp, my buddy had one in a 4100lb c body with a 440, ran 13.0 with 3.73 gears...he beat the crap out of that thing and the trans never let go.

but if you have 18 spline trans money it certainly wouldn't hurt to have it
 
twayne24365 said:
I'm putting a 23 spline iron case behind my 383, maybe 450 hp, my buddy had one in a 4100lb c body with a 440, ran 13.0 with 3.73 gears...he beat the crap out of that thing and the trans never let go.

but if you have 18 spline trans money it certainly wouldn't hurt to have it
Click to expand...
That's just it, I don't, but I'll wait until I do if that's what needs to be done. But if a 23 spline will work, why spend 4x more?
 
I did alot of research on them before I got one, most said the 23 spline will be fine...

23 splines did come behind 383 and 440 cars also
 
twayne24365 said:
I did alot of research on them before I got one, most said the 23 spline will be fine...

23 splines did come behind 383 and 440 cars also
Click to expand...
They did not come behind a factory 440 or 426 Hemi car for that matter.
Hemi 4 speeds (18 spline) came behind 440, 440 six pack, and all Hemi cars in conjunction with a Dana 60 rear........

My advice is that if you plan to beat it to hell with sticky tires, you'll be sorry if you stay with the 23 spline transmission.
Think about it, the factory wouldn't have stuck a much more expensive transmission and rear ends in the 440 and better 4 speed cars along with the Dana 60.
It wasn't about hype and promotions, it was to cover their *** on warranties.
The 440 cars were an honest 350 + H.P. and the Hemi cars were about 450 to 475 real H.P. but, the torque is what the extra strength was needed for.

Back in the day, i ran a 440 powered '69 Super Bee with a 23 spline tranny (the original one) and a 3:54 Dana 60 with a good clutch and pretty good traction, (and i ran the hell out of it) and the transmission never gave me a problem. I estimate that it had a bit more than 375 H.P. by the mph it ran in the 1/4 but that was about it.

So really, it's up to you with the abuse you are really going to do to it, and if you are an animal with the way you treat your car!

JMHO as always,
Tom.
 
Last edited:
large input shaft bearing 23 spine , should be fine . but if you want a 18 spline it would be best . it has been years since i bought mine . but i bought one from a guy with a hemi cuda that was all alloy case 18 spline input and red strip gears . i have got a bud that has a 18 spline iron case it got the nascar input and red strip gear package . but its setup with a yoke output for the bearing over bushing . and yes the red paint can be removed , lol .
DSC03802.JPG
 
j par said:
My bad, I was judging from my prospective witch is tubs are not "street car".
Click to expand...
Well, to be fair, I wouldn't have tubbed it out myself. I would have put some wider wheels with appropriate backspacing on for some "wider" tires. But these suckers look good....and I don't think traction will be a problem...turning maybe, but not traction! lol
 
j par said:
Was that a serious question ?
Click to expand...

Yup. This is all new to me. I know the difference between LS/Open/Posi differentials. "Spool" is new to me, unless you're talking about turbos, lol
 
ToMang07 said:
Yup. This is all new to me. I know the difference between LS/Open/Posi differentials. "Spool" is new to me, unless you're talking about turbos, lol
Click to expand...
spool = no open, no sure grip just two gears and two axels. Direct drive to both axels at all times.
 
My experience - I have a 23 spline 4-500hp drag car and have never had a problem. An 18 spline is no guarantee--
Screenshot_2017-02-23-11-18-26.png
 
those rear tire cry 18 spline input , well a 23 spline won't hold you to those and hp to boot ! my buds 18 spline with red stripe gear package would fit your build .
 
pomonamissel said:
those rear tire cry 18 spline input , well a 23 spline won't hold you to those and hp to boot ! my buds 18 spline with red stripe gear package would fit your build .
Click to expand...
Well if he's giving the "buddy" discount send me his number! lol
 
You must log in or register to reply here.
-

Back
Top