Rear Gear Question - Page 2

442OLDS · 09-16-2013, 08:48 PM

Quote:

Originally Posted by ss3011

I am surprised your only running a 4:56 and not a 4:88 .

I agree with a 4,260 pound car.

Mark Yacavone · 09-16-2013, 09:45 PM

I hadn't read your description yet when posting earlier.
I agree with most..4.30 is not gonna work.

SStockDart · 09-16-2013, 10:18 PM

My advise it: "Listen to Mark" and save some money down the road....For that matter, if anyone can make a 2 ton car run.......442Olds..knows

njk53 · 09-17-2013, 11:04 AM

Transmission is a TH 350 with a 4800 stall converter. Engine RPM through the lights is 6200

gsa612 · 09-16-2013, 07:54 PM

On mine at 3635 (G weight) in good air with the 94' tires I go through at 6700 with .56's.I can get away with .88's at altitude. You would have to check your dyno sheets and see where the motor falls off (cam type). At that weight you might be able to use 4.88's, if you have ceramic lifters make sure you have plenty of spring press, if not they might rattle at the top end with the extra rpm.

gsa612 · 09-17-2013, 11:28 AM

Is it 2.75 low, how fast have you gone 60', ET, mph?, shift points?. I would try 4.88, your 600 lbs. heavier than me.The difference between .56's and .88's is about 300 rpm on top end.You have to move that weight off the line in order for it to ET well.

njk53 · 09-17-2013, 01:29 PM

First gear is 2.75. Fastest the car has ever gone was at Martin last August. 60' was 1.62 ET was 12.25 @ 108 MPH. We have played around with shift points from 6150 to 6250. Didn't really make a difference. We were at the track last Friday and the best I went was 12.39 @ 107. The air was good and it was a nice cool day, should have gone better than what we did.

I have to admit, most of the time when I go through the lights, the shift light does not come on in 3rd gear, so I am not reaching the set engine RPM.

My brother and I feel the car has more in it but are struggling to find the extra ET and speed.

09-16-2013, 09:45 PM	#2
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,840 Likes: 2,932 Liked 5,150 Times in 1,966 Posts	Re: Rear Gear Question I hadn't read your description yet when posting earlier. I agree with most..4.30 is not gonna work. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

09-16-2013, 10:18 PM	#3
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,179 Likes: 881 Liked 606 Times in 213 Posts	Re: Rear Gear Question My advise it: "Listen to Mark" and save some money down the road....For that matter, if anyone can make a 2 ton car run.......442Olds..knows __________________ Gary Hansen - SS/FA 4911, B/SA 4911

09-17-2013, 11:04 AM	#4
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Re: Rear Gear Question Transmission is a TH 350 with a 4800 stall converter. Engine RPM through the lights is 6200 __________________ Nelson Kowal Stock 345

09-16-2013, 07:54 PM	#5
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Rear Gear Question On mine at 3635 (G weight) in good air with the 94' tires I go through at 6700 with .56's.I can get away with .88's at altitude. You would have to check your dyno sheets and see where the motor falls off (cam type). At that weight you might be able to use 4.88's, if you have ceramic lifters make sure you have plenty of spring press, if not they might rattle at the top end with the extra rpm. Last edited by gsa612; 09-16-2013 at 07:57 PM.

09-17-2013, 11:28 AM	#6
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Rear Gear Question Is it 2.75 low, how fast have you gone 60', ET, mph?, shift points?. I would try 4.88, your 600 lbs. heavier than me.The difference between .56's and .88's is about 300 rpm on top end.You have to move that weight off the line in order for it to ET well.

09-17-2013, 01:29 PM	#7
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Re: Rear Gear Question First gear is 2.75. Fastest the car has ever gone was at Martin last August. 60' was 1.62 ET was 12.25 @ 108 MPH. We have played around with shift points from 6150 to 6250. Didn't really make a difference. We were at the track last Friday and the best I went was 12.39 @ 107. The air was good and it was a nice cool day, should have gone better than what we did. I have to admit, most of the time when I go through the lights, the shift light does not come on in 3rd gear, so I am not reaching the set engine RPM. My brother and I feel the car has more in it but are struggling to find the extra ET and speed. __________________ Nelson Kowal Stock 345

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