4.10 or 4.56 gears for a 8-3/4 rearend - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech 4.10 or 4.56 gears for a 8-3/4 rearend

Print Thread

4.10 or 4.56 gears for a 8-3/4 rearend #717942 06/06/10 09:52 PM 06/06/10 09:52 PM
Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard... mopar65 OP master
mopar65 OP master Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard...	well my push rods are so posed to be here tomorrow. so that means i have to get off my butt and start building my 73 dart again. I have to take the 4.10 gears out and set them up right. so i was wondering if i should leave the 4.10 in it or go to the 4.56 gears. I have both sets of gears already so i wont be out any money. here is a little run down on my car. 1973 dodge dart weighs around 3400 11.1.1 440 Indy EZ heads flow 310-315 @ 600 lift comp solid roller 264@ 0.50 and 634 lift mopar m1 tunnel ram 2 750 carter carbs 727 with 10 inch turbo action 3800-4200 stall M/T 275/60/15 drag radials. I was thinking about using the 4.56 because i don't have enough converter right now.would the 4.56 make up the difference for the mismatched converter? look forward to your answers.thanks Mopar65 3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717943 06/06/10 10:01 PM 06/06/10 10:01 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: well my push rods are so posed to be here tomorrow. so that means i have to get off my butt and start building my 73 dart again. I have to take the 4.10 gears out and set them up right. so i was wondering if i should leave the 4.10 in it or go to the 4.56 gears. I have both sets of gears already so i wont be out any money. here is a little run down on my car. 1973 dodge dart weighs around 3400 11.1.1 440 Indy EZ heads flow 310-315 @ 600 lift comp solid roller 264@ 0.50 and 634 lift mopar m1 tunnel ram 2 750 carter carbs 727 with 10 inch turbo action 3800-4200 stall M/T 275/60/15 drag radials. I was thinking about using the 4.56 because i don't have enough converter right now.would the 4.56 make up the difference for the mismatched converter? look forward to your answers.thanks Mopar65 If its a race car 4.56 at least but you already answered your question

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: MR_P_BODY] #717944 06/06/10 10:10 PM 06/06/10 10:10 PM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: dennismopar73] #717945 06/06/10 10:17 PM 06/06/10 10:17 PM
Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard... mopar65 OP master
mopar65 OP master Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard...	wow that was easy thanks for the help Mopar65 ok that did not take very long on to the next question.with the 275/60/15 tires what would my trap rpms be with the 4.10 and the 4.56 gears? 3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717946 06/06/10 10:19 PM 06/06/10 10:19 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	1/8th or 1/4 mile? I run the same size tire w/ 4.10s and a converter that has about 7-8% slippage... it's spinning 6800+ through the traps at 125+ MPH in the 1/4. Given the mid-range that a tunnel ram could have, you may not be as far off as you think w/ your current converter. EDIT: Assuming 4.56s don't cause the engine to over-rev and actually lose MPH on the big end, they'd add another 400+ RPM on top of what 4.10s would turn. Last edited by Captain Budget!; 06/06/10 10:29 PM.

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: BradH] #717947 06/06/10 10:34 PM 06/06/10 10:34 PM
Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard... mopar65 OP master
mopar65 OP master Joined: Jan 2004 Posts: 3,837 Central Missouri Fort Leonard...	sorry about that. my home track will probably only let me run 1/8 to 1000 foot. but when i go to monster mopar or nor walk which are 1/4. i was wondering if the 4.56 would be to much gear for me. the 10 inch was for the other 440 i had in the dart that i never got to use and is going to have to do for now. Dewayne said to get a 5200 stall converter. which i plan to do but just not right now.i might just stay with the 4.10 but i wanted to see what you guys would say that are a lot smarter than me.thanks mopar65 3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717948 06/06/10 10:38 PM 06/06/10 10:38 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Keep the 4.10s. I don't see your combination benefiting from any more gear given the short tires.

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717949 06/06/10 10:53 PM 06/06/10 10:53 PM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	456 is the gear only one better would be 430 s j m o

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717950 06/06/10 11:05 PM 06/06/10 11:05 PM
Joined: Oct 2005 Posts: 2,611 Elbridge, NY D Dart1031 master
Dart1031 master D Joined: Oct 2005 Posts: 2,611 Elbridge, NY	Quote: wow that was easy thanks for the help Mopar65 ok that did not take very long on to the next question.with the 275/60/15 tires what would my trap rpms be with the 4.10 and the 4.56 gears? My Valiant with a 440, 4.10's and a 275 radial traps at 6,100. I only shift it at 5,500 though. It doesn't go any quicker shifting higher, lol.

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717951 06/07/10 12:13 AM 06/07/10 12:13 AM
Joined: Apr 2004 Posts: 12,339 somwhere S smokinwoody I Live Here
smokinwoody I Live Here S Joined: Apr 2004 Posts: 12,339 somwhere	the way I see it Bobby its only a 28" tire..if you were going to 31" or taller then I'd say go with the 4.56...forgot to say thats for 1/4 mile.. Last edited by smokinwoody; 06/07/10 12:14 AM.

383man [Re: Dart1031] #717952 06/07/10 12:15 AM 06/07/10 12:15 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	What I wonder is if it is tubbed or wheel wells stretched ?? If not you really cant fit a very tall tire under it. If so I would stick with the 4.10's. 4.10's with a 28" tire work good. You may not be able to fit any taller then a 28" tire under it. Ron

Re: 383man [Re: 383man] #717953 06/07/10 12:24 AM 06/07/10 12:24 AM
Joined: Oct 2004 Posts: 6,293 Northeast, Alpine, NY 9 9 Sec Phill On a road near you
9 Sec Phill On a road near you 9 Joined: Oct 2004 Posts: 6,293 Northeast, Alpine, NY	Sell them both and run 3.91 gear. The 440 has more then enough low end grunt (even with the tunnel ram) to move you down the track. If you go to low on the gear selection you will over power the tire. I have run 4.30 , 4.10 and then 3.91 and it went faster with lower ET with each change. This is with 28" tire A body. Why spin a motor higher then you have to to get the same results. ....Phill

Re: 383man [Re: 9 Sec Phill] #717954 06/07/10 01:15 AM 06/07/10 01:15 AM
Joined: Aug 2003 Posts: 43,172 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,172 Bend,OR USA	4:10 Like Phil said them 440 don't need no stinking low gears, them be BB Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717955 06/08/10 01:27 PM 06/08/10 01:27 PM
Joined: May 2003 Posts: 1,118 Central Missouri - USA Ramcharger super gas
Ramcharger super gas Joined: May 2003 Posts: 1,118 Central Missouri - USA	Another vote for 4.10. Using Randy's Ring & Pinion RPM calculator (I'd say the slippage % is pretty low): 4.10 - 28" tire - 125mph = 6315 rpm 4.56 - 28" tire - 125mph = 7023 rpm 4.10 - 28" tire - 130mph = 6567 rpm 4.56 - 28" tire - 130mph = 7304 rpm Your new engine probably has more RPM potential than I would feel confortable with using a semi-stock (internal pickup) oiling system. It will live a bunch longer if you keep the RPMs under 7000. Just my '64 Dodge 440 2 dr. sedan - 440/pushbutton 727 (in the body shop) '99 Dodge 2500 Quad Cab Long bed 4WD - CTD 5 spd. 3.54 '89 Dodge 150 4x4 - 5.9 TBI/727 35x12.50's and 8" lift '14 Dodge Dart Limited 2.4/6-speed A/T

Re: 4.10 or 4.56 gears for a 8-3/4 rearend [Re: mopar65] #717956 06/08/10 02:39 PM 06/08/10 02:39 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	I run 4.11`s in my dart w/a Hoosier QTP 29x13.5 steeet tire and love the way it runs at the track and more importantly how it drives on the street.....1.36 60`s at the track and I can drive it on the fwy for miles on end. Best of both worlds. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

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

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1