Rear gear choice for P51 combo

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Rear gear choice for P51 combo

Post  nuclearcobra on January 21st 2015, 7:38 pm

This is for a 1/4 mile drag only 92 mustang hatch with ladder bar setup on a 28x10.5 slick , weighing 2700 , running a C6 ,8.8, the converters going to UCC this week for a restall , the motor combo is a 552 , 14to1 , P51 heads, mafia intake, 1250 quick fuel, custom solid flat tappit, 276-286 @.050 689-668 lift , it has 3.90's in it now, what would be the right gear for this combo for all motor ? I was thinking 3.73 but want to know whats worked best for you guys plus Lennys going to need to know.Thanks,Bryan.
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Re: Rear gear choice for P51 combo

Post  cool40 on January 21st 2015, 9:38 pm

For best results N/A I gear for the max rpm I want it turning when I cross the finish line.
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Re: Rear gear choice for P51 combo

Post  FalconEh on January 21st 2015, 9:48 pm

cool40 wrote:For best results N/A I gear for the max rpm I want it turning when I cross the finish line.

X2 what is your finishline RPM, and is NOS in the mix.
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Re: Rear gear choice for P51 combo

Post  Larry T on January 21st 2015, 10:01 pm

back several years ago my 552 n/a motor was similar with a PG and 411 rear gear in the 1/4 the rpm was around 7400 on 28's.if I remember the time was 9.40@141 @ 3200lbs
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Re: Rear gear choice for P51 combo

Post  nuclearcobra on January 21st 2015, 10:29 pm

I think Lem said about 6700- 6800 for that motor combo would do it.
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Re: Rear gear choice for P51 combo

Post  dfree383 on January 21st 2015, 11:06 pm

Should peak around 6700ish. Probably shift at about 7100-7200 IMO
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Re: Rear gear choice for P51 combo

Post  FalconEh on January 21st 2015, 11:15 pm

Do you have room to grow the tire...if you do you could keep the 3.90 and increase the tire size if it is not optimum , if not you could go to the 3.73 and if it is too much you could shrink the tire. What MPH are you looking for 160ish
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Re: Rear gear choice for P51 combo

Post  cool40 on January 21st 2015, 11:57 pm

Whats it crossing at now? If you aint run this setup yet i wouldnt change it before i did. Cool
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Re: Rear gear choice for P51 combo

Post  bbf-falcon on January 22nd 2015, 6:00 am

cool40 wrote:Whats it crossing at now? If you aint run this setup yet i wouldnt change it before i did. Cool
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Re: Rear gear choice for P51 combo

Post  nuclearcobra on January 22nd 2015, 7:22 pm

This is a new setup and it will be a new converter, so we'll try it with the 3.90's first then.
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Re: Rear gear choice for P51 combo

Post  cool40 on January 22nd 2015, 10:16 pm

nuclearcobra wrote:This is a new setup and it will be a new converter, so we'll try it with the 3.90's first then.
good plan, that'll give you somewhere to start. Cool
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Re: Rear gear choice for P51 combo

Post  richter69 on January 24th 2015, 8:12 pm

I bet the 3.90 is gonna be damn close
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Re: Rear gear choice for P51 combo

Post  nuclearcobra on January 25th 2015, 5:38 pm

Well that's good to hear then, makes it a little easier Smile
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Re: Rear gear choice for P51 combo

Post  IDT-572 on January 29th 2015, 12:41 pm

I ran my 557 with a 28 x 10.5 with a 4.10 gear for 1/8th mile. It turned 7750 through the 1/4, ran 9.0s 150 mph. I would say the 3.90 will be close.
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Re: Rear gear choice for P51 combo

Post  hienergy557 on January 29th 2015, 9:18 pm

Mine will go through the finish line @ just under 7100.
572"/P51's, 33" tire, 4.11 & the car weighs 2500#
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