4:10's and a 26" tire?

[cochino12]

So I have decided to swap out my 3:73 with 4:10's that I have had laying around before I go to the track next weekend. Do you think that is too much gear for a 26" tire and a 700r? I am not concerned about rpm on highway, I just want this truck to scream light to light. I would like to dip into the 14's and ran a 15:4 with the 3:73s. I hope the new shift kit and gears will allow me to drop a few tenths. So am I going to get 0% traction at the light? or not much different than now?

[ocbaud]

you only ran a 15.4 with a zz4 engine????

[cochino12]

Originally Posted by ocbaud

you only ran a 15.4 with a zz4 engine????

yeah and here are my excuses


1. Power robbing mile high air
2. Hot 96 degrees
3. I need some more carb

[ocbaud]

hmm.... well that makes it a little better

i was gonna say because i ran a 15.7 with 2.73's AND my timing advanced about 45 degrees

[low 84]

if you haven't done anything to increase traction from the last iem you went then you will probly go slower with the 4:10's. torque multiplication dosen't do much for you if its just going up in tire smoke. some drag radials or et streets and some traction bars would help alot

[DCRANER]

Originally Posted by cochino12

So I have decided to swap out my 3:73 with 4:10's that I have had laying around before I go to the track next weekend. Do you think that is too much gear for a 26" tire and a 700r? I am not concerned about rpm on highway, I just want this truck to scream light to light. I would like to dip into the 14's and ran a 15:4 with the 3:73s. I hope the new shift kit and gears will allow me to drop a few tenths. So am I going to get 0% traction at the light? or not much different than now?

I have a ZZ430 with a Turbo 400, 3.73 gears and 28" tires. I ran a 14.2 @ 100 MPH but just got out of 2 nd. gear to 3 rd. as I hit the speed traps.

So, I am going to 4.10's soon, would like 4.33's but cannot get that in a 10 bolt setup.

I think you are about right with 4.10 and 26" tires, but you can go to Prestage.com and plug in tire size, etc. and see your RPM at certain speeds. You will want to be a few hundred RPM's short of redline for the best run IMHO, being in third gear @ a 1 to 1 ratio.

[cochino12]

Originally Posted by low 84

if you haven't done anything to increase traction from the last iem you went then you will probly go slower with the 4:10's. torque multiplication dosen't do much for you if its just going up in tire smoke. some drag radials or et streets and some traction bars would help alot

Traction really wasnt bad with the 3:73's I just dont want to do more harm then good

Originally Posted by DCRANER

I have a ZZ430 with a Turbo 400, 3.73 gears and 28" tires. I ran a 14.2 @ 100 MPH but just got out of 2 nd. gear to 3 rd. as I hit the speed traps.

So, I am going to 4.10's soon, would like 4.33's but cannot get that in a 10 bolt setup.

I think you are about right with 4.10 and 26" tires, but you can go to Prestage.com and plug in tire size, etc. and see your RPM at certain speeds. You will want to be a few hundred RPM's short of redline for the best run IMHO, being in third gear @ a 1 to 1 ratio.

Thanks thats some good info.

[Tom]

4.10's and a 700r4's 3. somthing first equal no traction without some slicks. But if you keep the wheelspin down then they could help make up for it threw the rest of the 1/4.

[TIMSPEED]

Honestly, 3.73's/26" Tire/700R4 sould be the PERFECT combo. Traction is 100% necessary to run good times. If you can get a 2.0 60' (or even better than that) you'll get some good times, trust me. Just remember, every .1 off your 60', is worth .2 at the big end.

[DCRANER]

Originally Posted by TIMSPEED

Honestly, 3.73's/26" Tire/700R4 sould be the PERFECT combo. Traction is 100% necessary to run good times. If you can get a 2.0 60' (or even better than that) you'll get some good times, trust me. Just remember, every .1 off your 60', is worth .2 at the big end.

Very good point, I did not think of that right away. I have a Turbo 400 and first gear kills me without at least a 4.10 rear, but the 700R4 has a terrific first gear, so with traction his 3.73 & 26" tire may really work, although I still think he will be no where near a good top end RPM in third gear when he hits the speed traps without more rear gear. But, traction will help his times significantly.

[cochino12]

Originally Posted by DCRANER

although I still think he will be no where near a good top end RPM in third gear when he hits the speed traps without more rear gear. But, traction will help his times significantly.

That is exactly why I wanted to switch them, the truck is great off the light but just doesnt have enough through the traps. My mechanic is only charging me $50 to swap so if they dont work I can always switch them back and not be out a lot of money.

[DCRANER]

Originally Posted by cochino12

That is exactly why I wanted to switch them, the truck is great off the light but just doesnt have enough through the traps. My mechanic is only charging me $50 to swap so if they dont work I can always switch them back and not be out a lot of money.

Well I can tell you that a 4.10 rear with a 700R4 first gear is like having a Turbo 400 (first gear) with about a 5.13 rear. If you can hook you will have an amazing 60' time. I have 325 / 50 / 15 Drag Radials, aired down to about 22 pounds and I have to get them hot to stick.

My moto is ............ If it blows up, just go with more HP & Gear !!

[cochino12]

So what psi should I have my tires?

[low 84]

what kind of tires are they?

[AirMale]

I was at the track last night and I'm running a 28X12 slicks with a 3.42 gear. It's all about traction PERIOD! These trucks do not need more than a 3.73 unless you have a 31-33" slick. The problem unfortunatley is no weight transfer to the rear leafs. If you put such a low gear in your truck you will hate driving on the street. I would put your money into the motor or four link the rear. I have many friends that have gone overboard modifying their rides to get good track times, but now they don't drive them on the street. I would rather have a high horsepower motor and feather it outta the hole than have a low gear and a high reving engine when cruising. It just depends how much time you spend at the track. I have gone with a 650hp motor and have the stock 10 bolt. I run consistent 12.50's and think there's another second to lose with a four link. I will never give up the 3.42's.
Please post times whenever you get back from the track. Oh by the way, I used to have a 383/450hp sbc and same rear and ran 14.2's, so bring on the power.

[cochino12]

Originally Posted by low 84

what kind of tires are they?

Bfg comp ta 295-35-18

[DCRANER]

Originally Posted by AirMale

I was at the track last night and I'm running a 28X12 slicks with a 3.42 gear. It's all about traction PERIOD! These trucks do not need more than a 3.73 unless you have a 31-33" slick. The problem unfortunatley is no weight transfer to the rear leafs. If you put such a low gear in your truck you will hate driving on the street. I would put your money into the motor or four link the rear. I have many friends that have gone overboard modifying their rides to get good track times, but now they don't drive them on the street. I would rather have a high horsepower motor and feather it outta the hole than have a low gear and a high reving engine when cruising. It just depends how much time you spend at the track. I have gone with a 650hp motor and have the stock 10 bolt. I run consistent 12.50's and think there's another second to lose with a four link. I will never give up the 3.42's.
Please post times whenever you get back from the track. Oh by the way, I used to have a 383/450hp sbc and same rear and ran 14.2's, so bring on the power.

Well, with all due respect you have these results because of 650 HP and probably massive torque to move the weight of the truck in spite of a mild rear gear ratio.

Short of a mountain motor like yours, and that must be a very cool site, most of us will need more rear gear & a higher stall converter to get the weight of the truck moving. So, we need a torque multiplier to get close to your torque effect with your mild rear gears.

[TIMSPEED]

My goal is to run a low/mid 14 with my current setup. I'm pretty sure I can do it. But Cochino, don't forget NHRA Correction Factor. Where you're at, if you can run a 14, that's nearly like running a 12 at sea level. So, if you brought your truck HERE and raced it, you'd be impressed.
Here's the site for the correction ~> NHRA Correction Page

[SanitysBane]

all righty heres a table i formed with a 700R4 in OD and a 26 inch tall tire going 70 mph

3.42-2167.6197942185204 rpm
3.88-2459.1709946104847 rpm
4.11-2604.9465948064676 rpm
4.56-2890.1597256246937 rpm

now at 80

3.42-2477.279764821166 rpm
3.88-2810.481136697697 rpm
4.11-2977.0818226359624 rpm
4.56-3303.039686428221 rpm

now at 90

3.42-2786.9397354238117 rpm
3.88-3161.791278784909 rpm
4.11-3349.217050465458 rpm
4.56-3715.9196472317485 rpm

if you ask me, i wouldn't mind running a 4.56 on the street as the fastest i would ever be going would be 80 at 3303 rpm, now this is with the 700R4s .7:1 over drive and not with a turbo 350 or 400 1:1 3rd gear.
i used the calculator here http://www.race-cars.net/calculators...alculator.html if y'all have any questions.

[cochino12]

Originally Posted by TIMSPEED

My goal is to run a low/mid 14 with my current setup. I'm pretty sure I can do it. But Cochino, don't forget NHRA Correction Factor. Where you're at, if you can run a 14, that's nearly like running a 12 at sea level. So, if you brought your truck HERE and raced it, you'd be impressed.
Here's the site for the correction ~> NHRA Correction Page

That is a pretty cool site, but seems a little generous to me though. We'll see what happens it probably wont be as hot as last year so maybe I'll dip into the 14's. 14.99999 would make me happy.

[TIMSPEED]

Originally Posted by cochino12

We'll see what happens it probably wont be as hot as last year so maybe I'll dip into the 14's. 14.99999 would make me happy.

Just remember, Bandimere is at 5960' elevation. If you run anywhere in the 14's up there, it's like running a 12 down here. Maybe you should just move down here and have a fast truck