23 spline behind a 440 stroker? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer 23 spline behind a 440 stroker?

Print Thread

23 spline behind a 440 stroker? #143436 10/30/08 08:11 AM 10/30/08 08:11 AM
Joined: Aug 2005 Posts: 65 Adelaide, SOUTH Australia R REDNICK OP member
REDNICK OP member R Joined: Aug 2005 Posts: 65 Adelaide, SOUTH Australia	Hi all, I am building a new engine for my 68 Coronet R/T to replace the current 440 which is fuming a bit more under load than it should. I was going to re ring the fumey engine and use it in another B Body project I have on the go (That car is an auto ) The Coronet had the 4 speed installed in about 1970, and also has a 3.9:1 8 3/4 rear end. For the replacement,I am using a 68 block with a 512 Stroker kit and a set of Stealth heads. Its going to run a shortish duration but high lift cam with 1.6 ratio rockers, headers,Street Dominator and 870 Holley. People are telling me it will SHRED the 23 spline box and alumimium bellhousing, which so far has given no trouble. What do you reckon? Go to the expense of an 18 spline or Tremec? Or just be a bit careful with dropping the clutch? Someone must have beat on a 23 spline before?? Nick. 4781958-Mopars115.JPG (66 downloads)

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143437 10/30/08 08:33 AM 10/30/08 08:33 AM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	The 23 spline can take abuse , even the 18 spline hemi trans can be broken , usually it's 3rd gear . the bellhousing is more in mind of a clutch explosion , use SFI pieces and a blowshield , but for now you can run the stuff you have .

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143438 10/30/08 09:13 AM 10/30/08 09:13 AM
Joined: Dec 2005 Posts: 1,233 Eastern North Carolina cyphre666
cyphre666 Joined: Dec 2005 Posts: 1,233 Eastern North Carolina	I would go with a blow proof bellhousing. Saftey issue. you may never blow a clutch, but if it does happen you will regret not having one. The 23 spline is a weak point, the 8 and 3/4 rear is also a weak point. If it is for playing on the street you should be fine. If you are hard hitting it with slicks that's another story.

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143439 10/30/08 09:25 AM 10/30/08 09:25 AM
Joined: Feb 2007 Posts: 898 iowa copchaser super stock
copchaser super stock Joined: Feb 2007 Posts: 898 iowa	The 23spline will be fine, I would use a scatter shield for safety. If you run a tremec you will be asking for problems. The stock bellhousing will take it but if something comes unglued, say good buy to your foot.

Re: 23 spline behind a 440 stroker? [Re: copchaser] #143440 10/30/08 09:39 AM 10/30/08 09:39 AM
Joined: Aug 2004 Posts: 3,333 MARYLAND 69Cuda340S master
69Cuda340S master Joined: Aug 2004 Posts: 3,333 MARYLAND	The stickier the tires the stronger the drive train needs to be.

Re: 23 spline behind a 440 stroker? [Re: 69Cuda340S] #143441 10/30/08 10:31 AM 10/30/08 10:31 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Don't have any first hand experience on your question, Just want to say thats a cool pic

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143442 10/30/08 11:20 AM 10/30/08 11:20 AM
Joined: Oct 2003 Posts: 4,013 South Park, Pa. 68LAR master
68LAR master Joined: Oct 2003 Posts: 4,013 South Park, Pa.	Based on first hand experience here is my You will be okay with what you have, however, Get rid of the aluminum belhousing as soon as you can and get either a scattershield or an oe steel unit. You will break the 8 3/4 before you break the transmission. A 23 spline has been in my car since I bought it new in '68. Never have I broken a transmission. I run slicks when I race and actually pull the wheels every once and a while. The 23 spline is a stout piece. Do what you want, these are just my suggestions based on personal experiences. 4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143443 10/30/08 12:33 PM 10/30/08 12:33 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: Hi all, I am building a new engine for my 68 Coronet R/T to replace the current 440 which is fuming a bit more under load than it should. I was going to re ring the fumey engine and use it in another B Body project I have on the go (That car is an auto ) The Coronet had the 4 speed installed in about 1970, and also has a 3.9:1 8 3/4 rear end. For the replacement,I am using a 68 block with a 512 Stroker kit and a set of Stealth heads. Its going to run a shortish duration but high lift cam with 1.6 ratio rockers, headers,Street Dominator and 870 Holley. People are telling me it will SHRED the 23 spline box and alumimium bellhousing, which so far has given no trouble. What do you reckon? Go to the expense of an 18 spline or Tremec? Or just be a bit careful with dropping the clutch? Someone must have beat on a 23 spline before?? Nick. I'm running a 23 spline behind a 472 hemi and a stock Road Runner. The car is street driven. So far I've had no issues other than the no name blocker rings that I put in that causes it to grind every once and while. I plan on rebuilding it as 3rd gear has always been a bit noisy. Since I have it apart I'll probably upgrade it to 18 spline guts and late model syncro assemblies.

Re: 23 spline behind a 440 stroker? [Re: REDNICK] #143444 10/31/08 07:42 AM 10/31/08 07:42 AM
Joined: Apr 2006 Posts: 894 uk TiMopar super stock
TiMopar super stock Joined: Apr 2006 Posts: 894 uk	The 23-spline can take lots of abuse; thats based on experience of mine and people I've known. However, definately invest in a scattershield!!! ( The factory cast iron Bells weigh a ton and the alloy ones crack ) 4783996-catspnning_001.gif (52 downloads)

Re: 23 spline behind a 440 stroker? [Re: TiMopar] #143445 10/31/08 08:41 AM 10/31/08 08:41 AM
Joined: Nov 2007 Posts: 317 Indiana 7 79_W200 enthusiast
79_W200 enthusiast 7 Joined: Nov 2007 Posts: 317 Indiana	I run a 23 spline in my truck behind a 470 and pull a sled i don't launch like a strip car but its held up 4784051-rockville.jpg (34 downloads) 1979 W200 470

Re: 23 spline behind a 440 stroker? [Re: 79_W200] #143446 11/01/08 04:59 AM 11/01/08 04:59 AM
Joined: Jan 2007 Posts: 82 Spring Hill, Fl. T tecmopar member
tecmopar member T Joined: Jan 2007 Posts: 82 Spring Hill, Fl.	A fresh 23 spline is stronger then a Tremec. These were actually labeled heavy duty 4-speeds and the 18 spline is the Severe duty unit. As someone already said you'll break other parts first.

Re: 23 spline behind a 440 stroker? [Re: tecmopar] #143447 11/03/08 10:29 PM 11/03/08 10:29 PM
Joined: May 2004 Posts: 5,123 Warrenton, VA RoadRunnerJD master
RoadRunnerJD master Joined: May 2004 Posts: 5,123 Warrenton, VA	IMO 6500 RPM launches with a 3.09 or 2.66:1 23 spline and slicks in a B-body are fine. If something breaks, it's probably not because the trans isn't strong enough. They used to run them in the pro stock cars in the 60's and early 70's. Keep in mind that whether it's 18 or 23 spline, 8 3/4 or Dana 60, you do get fatigue in parts.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1