3.73 vs 4.11

by denard52 Tue May 11, 2010 9:36 am

Hello, I was wondering if I could get you guys opinion on which rear gears to go with. Currently I still have the stock gears in (i believe they are 2.73's) and I can't stand it. I would like to smoke the tires from time to time but these gears will not allow that to happen. I have a 350 in it with a TH350. I have a set of 22" x 11" rims on the back with a total height of 29" including the tire. Right now it's more geared for the highway but i would like to wake it up off the line with some smokey burnouts. Any thoughts?

by The Dude Tue May 11, 2010 10:14 am

350/350 combo, you could go with either. Be warned that your top speed will be limited with 4.10's. My brother has those in his truck & it's SCRRREEEAAMING at 85-90 mph. Really hard to say which gears to go with unless we know more about the car. Engine specs, car's primary purpose, & even driving conditions can change my mind on which gears to choose.

by denard52 Tue May 11, 2010 10:38 am

Rago wrote:350/350 combo, you could go with either. Be warned that your top speed will be limited with 4.10's. My brother has those in his truck & it's SCRRREEEAAMING at 85-90 mph. Really hard to say which gears to go with unless we know more about the car. Engine specs, car's primary purpose, & even driving conditions can change my mind on which gears to choose.

Thanks, unfortunately I don't have much on the engine it came with the car and the guy I bought it from only said it had a mild cam. Wasn't to concern with the engine when I bought it because I had plans to replace it with a 400. But the engine swap will get pushed to the winter but I would still like to wake the car up for now. It also has a 2500 RPM stahl in it.

Primary use is driving around town, I don't do too much highway driving, if so it's for short periods of time. I am more of a drag racer's so top speed I'm not really interested in.

by Limey SE Tue May 11, 2010 1:33 pm

with your tire being 29" right now your gears are actually around the 2.50 range and not the 2.73...............If you are gonna keep the 29" tire I would most definitely go with the 4.10 gears for the tire height you are running will drop it back down to a 3.70 gear anyways you will be very happy with it.

by denard52 Tue May 11, 2010 1:37 pm

Limey wrote:with your tire being 29" right now your gears are actually around the 2.50 range and not the 2.73...............If you are gonna keep the 29" tire I would most definitely go with the 4.10 gears for the tire height you are running will drop it back down to a 3.70 gear anyways you will be very happy with it.

Thanks for your help!!!

by Limey SE Tue May 11, 2010 1:40 pm

NO PROBLEM

by coreys73chevelle Tue May 11, 2010 2:02 pm

yea 3.70 or 3.90 would be good

by JB2wheeler Tue May 11, 2010 2:31 pm

Yeah, Limey is right. If all you wanna do is burn some rubber to make some noise, then go back to 14 inch tires with the stock diameter of 25 or 26 inches. If you want to be serious on the street with a 350, go with a 27 inch diameter tire. Personally I like the 273 gears from the factory with posi but dont like the 2.56 gears. JB

by denard52 Tue May 11, 2010 2:42 pm

JB2wheeler wrote:Yeah, Limey is right. If all you wanna do is burn some rubber to make some noise, then go back to 14 inch tires with the stock diameter of 25 or 26 inches. If you want to be serious on the street with a 350, go with a 27 inch diameter tire. Personally I like the 273 gears from the factory with posi but dont like the 2.56 gears. JB

I hear ya, but I'm partial to the larger wheels filling up the wheel wells. But as always thanks for your advice!!!

by chevy76monteman Tue May 11, 2010 10:42 pm

I am running a 350/350 combo with 3.73 gears and 15x7 wheels with 245/60-15 tires. I am turning about 4000rpm @ 60mph and am getting 10mpg. The engine has a Comp Cams XE268H Cam with .477/.480-inch lift and am running a 2500-stall converter.

by JB2wheeler Wed May 12, 2010 6:44 am

chevy76monteman wrote:I am running a 350/350 combo with 3.73 gears and 15x7 wheels with 245/60-15 tires. I am turning about 4000rpm @ 60mph and am getting 10mpg. The engine has a Comp Cams XE268H Cam with .477/.480-inch lift and am running a 2500-stall converter.

Thats a lot of cam for a 350. I have a little bigger Comp roller cam than that, but the big blocks can take a lot more cam than a 350 without affecting daily operation. I have a 2300 stall converter with 3.42 rear gears and I turn 3,000 RPMs at 60 with 27 inch tall tires. JB

by BlackChevelleSS Wed May 12, 2010 12:35 pm

The 383 we stuffed in a daily driven iroc had a .600 lift cam

by JB2wheeler Wed May 12, 2010 1:01 pm

BlackChevelleSS wrote:The 383 we stuffed in a daily driven iroc had a .600 lift cam

Wow! What do you have to keep the idle at to keep it running? JB

by The Dude Wed May 12, 2010 1:07 pm

Once helped build a 355 that had a cam with 244 deg @.050 on a 104 deg LCA & it would idle down to 1000 RPM. Sounded wicked.... Smoking

by Jim_Rockford Wed May 12, 2010 6:16 pm

Loose the clown car 22's and get some reg rims and 3.73's 4.11 are too low unless you are racing 1/8th mile.

by Limey SE Wed May 12, 2010 6:32 pm

but if he stays with a 28 or 29" tall tire with the 3.73 Jim he will be lower yet ............thats why I said the 4.11 or 4.10 what ever it is

by BlackChevelleSS Wed May 12, 2010 9:13 pm

Jim_Rockford wrote:Loose the clown car 22's and get some reg rims and 3.73's 4.11 are too low unless you are racing 1/8th mile.

I agree, I had 4.11s once it sucked th400 3000 stall and a 25.5" tire. oh man did it scream with that 396. I like my 3.31s with 28" tire. does great on the highway, driving around town, and I can still bust off 11s with slicks at the track.

by denard52 Thu May 13, 2010 7:37 am

BlackChevelleSS wrote:
Jim_Rockford wrote:Loose the clown car 22's and get some reg rims and 3.73's 4.11 are too low unless you are racing 1/8th mile.

I agree, I had 4.11s once it sucked th400 3000 stall and a 25.5" tire. oh man did it scream with that 396. I like my 3.31s with 28" tire. does great on the highway, driving around town, and I can still bust off 11s with slicks at the track.

Thank you all for your input!!!

Hey Jim Rockford, you got your taste and I got mine. But thanks for your input. Beer

by 1973chevelle Thu May 13, 2010 4:48 pm

I would go with the 3:73, there still a good low gear for taking off good and smoking the tires, my 73 still has the 2:73's in it and i can smoke the tire but if i had bigger wheels i probably wouldnt be able to, i think the 4:11's or 4:10's will be wayyy too low, those are mostly for drag racing, but for a good all around gear will be some 3:42's, thats what i wish i had but there expensive with me not having much of a job

by 74Malibu383 Mon May 17, 2010 4:44 pm

I'm for the 3.73's. I have 4.10's in mine and I can't get traction to save my life. I'm thinking of swaping them out shortly. And by shortly, I mean some day. Smile

by The Dude Mon May 17, 2010 4:55 pm

Wonder why you can't get traction? LMAO

by 74Malibu383 Mon May 17, 2010 4:58 pm

I'm not sure. I think that extra wide belt hanging off the front of the motor might have something to do with it.

by The Dude Mon May 17, 2010 4:59 pm

Ever get the nitrous hooked back up?

by 74Malibu383 Mon May 17, 2010 5:07 pm

Oh... It's BEEN hooked up!!!!! I just don't dare hit the button with the current piston set up. I've got a full bottle, remote bottle opener, MSD Retard Control, and an itchy trigger finger. I just know that at full boost and a 150 shot flowing through the motor, I'm going to leave a good portion of it on the street if I hit it.

Plan - It's running great now, and I'll drive it this summer. When it cools down here I am going to pull the motor and go forged everything. I'll then up the boost to about 12PSI, and be able to hit the "go fast" button again. I talked to ProCharger and they're telling me just the piston swap will give me 725HP conservatively without the nitrous.

However, I’m planning on a port and polish job and maybe even a few extra cubic inches by boring it out. So… There’s no telling what the number is going to be. I can tell you I’ll be at the 2011 Power Tour though! That’s the only deadline I have.

by The Dude Mon May 17, 2010 5:11 pm

You're NUTS! I'd do it too if I had the money though.

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