Rear Gear Question

gsa612 · 09-16-2013, 05:26 PM

I run the same 402/315 but in a Camaro, it all depends on the cam, lobe sep.etc. I run a 4.56 with a tight cam,2.75 low, 4800 flash.I think you would lose 60' and ET with a heavy car like yours by changing the SLR.You can get away with a little more rpm on that motor because of more exhaust lift (.430). If you run the big hoosiers 94" as opposed to the 92.5" it will give you around 200 rpm. gsa612

ss3011 · 09-16-2013, 07:25 PM

I am surprised your only running a 4:56 and not a 4:88 . Even though it's a different combo, I have a 71 Lemans wagon I run in J/SA. To get it moving I have a 2.75 low gear and a 4:56 . Trap rpm is about 6500, I would think your 402 would turn at least that high. What rpm do you run through the lights ?

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

09-16-2013, 05:26 PM	#1
gsa612 Senior Member Join Date: Jan 2008 Location: 100th Meridian Posts: 569 Likes: 116 Liked 280 Times in 139 Posts	Re: Rear Gear Question I run the same 402/315 but in a Camaro, it all depends on the cam, lobe sep.etc. I run a 4.56 with a tight cam,2.75 low, 4800 flash.I think you would lose 60' and ET with a heavy car like yours by changing the SLR.You can get away with a little more rpm on that motor because of more exhaust lift (.430). If you run the big hoosiers 94" as opposed to the 92.5" it will give you around 200 rpm. gsa612 Last edited by gsa612; 09-16-2013 at 05:32 PM.

09-16-2013, 07:25 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 910 Likes: 70 Liked 239 Times in 114 Posts	Re: Rear Gear Question I am surprised your only running a 4:56 and not a 4:88 . Even though it's a different combo, I have a 71 Lemans wagon I run in J/SA. To get it moving I have a 2.75 low gear and a 4:56 . Trap rpm is about 6500, I would think your 402 would turn at least that high. What rpm do you run through the lights ?

09-16-2013, 09:45 PM	#4
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,822 Likes: 2,916 Liked 5,133 Times in 1,957 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	#5
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,178 Likes: 880 Liked 574 Times in 212 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	#6
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

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