[Blade]

I am running 4:86 pro gear in a strange alum center section with 35 spline axles. Trap RPM is maxing out at 6300.

I was thinking about droppin it down to a 4:30 gear.

What you guys think?

 

[Blade]

Bump

 

[PONYEATER]

give us more info on the car... weight, hp, max rpm, what coverter and stall and 1/8 or 1/4 mile racing...

we will start there...

 

[Blade]

give us more info on the car... weight, hp, max rpm, what coverter and stall and 1/8 or 1/4 mile racing...

we will start there...

ok.

Weight is around 2700

HP- is around 750

RPM is only going to 6200-6300

Convertor is an 8inch 4500 ATI

1/4

thanks

 

[PONYEATER]

tire size?

 

[Blade]

14*32*15

 

[PONYEATER]

how much are you trying to drop down? depending on the converter you may not see much improvement. I would give 4.30's a try but something with your numbers doesn't add up... what times are you turning in this car?

 

[Blade]

how much are you trying to drop down? depending on the converter you may not see much improvement. I would give 4.30's a try but something with your numbers doesn't add up... what times are you turning in this car?

I want enough where can I stay into the gear longer. The RPMs shot up way too fast and I cant stay in the gear long. I was thinking 4:30s as well.

What doesnt add up?

Right now 11.20s AT 119MPH

 

[PONYEATER]

this is why I think it does not add up.

my car
2680lbs with me in it
approximately 750-800hp
32x14.5w tire
4.30gear
crosses at 7000rpm

I think you have a converter issue... who's is it and how old is it?

 

[Blade]

ATI only has about 3 passes on it.

 

[PONYEATER]

Like I said before I would try the 4.30's but given your MPH with your ET I do not see you gaining much if at all..

 

[Blade]

Like I said before I would try the 4.30's but given your MPH with your ET I do not see you gaining much if at all..

R u thinking 4:11s?

Or a smaller convertor?

 

[PONYEATER]

I would try the 4.30's I think your going to go slower with them.. or the same. Post up what happens

 

[Blade]

I should be able to stay in the gears longer right?

 

[PONYEATER]

yes

 

[Blade]

That should pick up the et and mph then?

 

[Duffster]

http://vexer.com/automotive-tools/speed-rpm-calculator For ideas...

 

[JShelton]

Not sure if its a converter issue but I agree the rpm with 4.30 gear doesn't add up. I'm running a 4.30 with a th400,14.5x32,700ish hp, trapping at 6800 I would think with a 4.86 rear gear you would be well into the 7500 rpm range.

 

[Blade]

I am losing somewhere because my 1/8th mile time is a 7.10 and my 1/4th mile is 11.20s. That is why I wanna switch out the ring and pinion. Thinking the 4.86 gears are too big. I was about to order the 4.30s.

 

[Blade]

What one would you guys go with? Jegs kit or Richmond

http://www.jegs.com/i/JEGS-Performance-Products/555/60045K/10002/-1?parentProductId=750807

http://www.jegs.com/i/Richmond-Gear/836/69-0161-1/10002/-1?parentProductId=744484