View Full Version : what will gears do?


L$X$10
10-21-2010, 06:59 PM
I ran a 12.9 with 3.42s and shorties since then I have added longtubes and an underdrive pulley and wonder what I would run with my current setup and some 3.73s

01SS99red
10-21-2010, 07:13 PM
with what you added and 3.73 I could see 12.7-12.6 easy.

FASTEDDIE Z
10-21-2010, 09:16 PM
I ran a 12.9 with 3.42s and shorties since then I have added longtubes and an underdrive pulley and wonder what I would run with my current setup and some 3.73s

Maybe a tenth , tenth and a half .. not worth it . I went from 273 to 373 and had a tune .Dropped @ 3 tenths . I assuming your a 6 speed ? than 410 would be a better choice .If your an auto and dont have a stall converter ,than look into getting 1 . My stall dropped over 6 tenths .Would of been more if it was as cool as it was w.o. the new stall .

L$X$10
10-22-2010, 11:26 AM
Its a built 4l60e from FLT and I have a 3600 Yank converter ..I'm not looking to go 4.10s bc I drive from mid GA to north FL every other weekend and traction is still an issue even with the caltracs and sticky tires

got-a-ls1
10-22-2010, 08:14 PM
if you havnt bought the gears i wouldnt waste the time going 3.42 to 3.73.... if you had 2.73's yes but 3.42 to 3.73 is not worth the gear oil. Someone at my local 1/8th track had a 98 t/a with 2.73's and installed some 3.73's. Went from running 9.0's to 8.6's-8.7's.

L$X$10
10-23-2010, 05:37 PM
not the answers i expected but at least now i know to spend the money else where

blwn_00gt
10-23-2010, 08:54 PM
if you havnt bought the gears i wouldnt waste the time going 3.42 to 3.73.. Someone at my local 1/8th track had a 98 t/a with 2.73's and installed some 3.73's. Went from running 9.0's to 8.6's-8.7's.

i think that gain is worth changing gears imo....

got-a-ls1
10-28-2010, 08:16 AM
i think that gain is worth changing gears imo....
i agree it was definitely worth it... but OP has 3.42 gears already. The car i was talking about went from 2.73's to 3.73's Big difference between having 3.42's or 2.73's and going to 3.73's.

3.42 to 3.73 wouldnt be worth too much i dont think.

MikeG
10-28-2010, 08:49 AM
Agreed. Not worth it. Buy some suspension shit.

Bill00Formula
10-28-2010, 07:15 PM
I assume this is a 6 spd. I've seen people pick up quite a bit. 2-3 tenths and 1-2 mph with bolt on cars. One guy I know gained alot going from 3.42s to 3.73s then went from 3.73 to 4.10s and picked up nothing.

Hardtop
10-29-2010, 07:46 AM
Not worth it.

L$X$10
01-24-2011, 01:07 PM
im currently running 12.33@109.74 and the N/A 5.3 truck record is 12.08...im now debating on picking up a set of 799 heads for $350 shipped or get the gears and spend around the same after all is said and done..what ya think? heads?

FiredUpZ28
01-24-2011, 01:38 PM
Why so tall? Its a 6 speed, go 4.10 at least. Theres 2 overdrive gears so cruising isn't bad at all. If I had a 6 speed car I wouldn't put in anything less (numerically) than a 4.30 gear.

Fast T
01-24-2011, 10:34 PM
I would go with a 410. A 373 from a 342 its a waste of your money :D.

L$X$10
01-25-2011, 04:38 PM
Why so tall? Its a 6 speed, go 4.10 at least. Theres 2 overdrive gears so cruising isn't bad at all. If I had a 6 speed car I wouldn't put in anything less (numerically) than a 4.30 gear.

:read: its a 4l60e;)

FiredUpZ28
01-25-2011, 04:44 PM
Ha, good point. He said he had 3.42s in the first post so I assumed M6 :doh:

green28
01-28-2011, 10:45 AM
the N/A 5.3 truck record is 12.08

What is that record? N/A 5.3 for any truck or just (swapped like yours) or just for production trucks?

Anyway I didn't gain much switching from 2.73 to 3.73, other than it was more fun to drive on the street, so I would not hassle with going from 3.42 to 3.73.

Is there any other bolt-ons or weight reduction left to do before you switch heads? Do you know what kind of power you are putting down? I would think there is more room left to lower your 60 ft. with your mods and that stall, but then again not sure how your suspension is setup.

lemons12
01-28-2011, 11:20 AM
You will be vehicles upset with the slim to no gain you get with that swap and how much it will effect your highway mpg. Do not waste money on that.

Look into heads if you are looking to drop .3.. or look at getting your converter restalled to a 4000. Either one of those will let you drop a couple tenths and not sacrifice anymore driveability.


Just saw your sixty foot.. if you are hooking, that should be way! Lower.. A ptc4000 would get you in the 1.5 range.. which should get you in the 11s. If not throw a skinny ire on the front.. If you are at 12.3 now, those two things will get you there.
I would concentrate on your sixty foot, not top end/power mods.. suspension converter etc....1 in the sixty is .2 off et, .2 in sixty is .4 off et.

L$X$10
01-28-2011, 11:31 PM
this is the truck that claimed to hold the N/A 5.3 record:
http://www.performancetrucks.net/forums/showthread.php?t=476382

i think i may go 4.10s now after calling a speaking with someone at calvertracing...he said since i wasnt spinning at all that i really just needed to throw more gear and power to it to get the 60ft down(i thought i could do it with just a better suspension?)

and i would like to stall it higher but its a daily driver and the 3600 is already turning the hell out of some rpms..so i might just look into mild heads and or a FAST intake

lemons12
01-29-2011, 12:04 AM
Lmao.. you are considering 410s but don't want to move to a 4000 cause of driveability.410s are going to absolutely slaughter your mpg at anything over 60. Ask me how i know, i did it for two years.
Not to mention you might go from a 1.75 to 1.70 short time, autos dont respond to gears like manuals do.

I can almost promise you will regret going to 410s. If you have to gear down for piece of mind, go 373@.. I am cutting 1.4s with 380rwhp 3450# rw ptc 4000.. there are guys cutting 1.4s with 323s.

The different between a 3600 and a 4000 converter under normal pickup is around 75 rpms, once you hit lockup it is like stock of course with either.

If it were me... switch to a ptc 4000.. if you have to keep your converter, restall to 4000.. then start with suspension. I would look into skinnies as well, that's a proven tenth.

lemons12
01-29-2011, 12:08 AM
What is your race weight?
What bolt ons do you now have?


You have he top end he has.. he is pulling a better sixty foot, where the et comes from.. what is the differences in your setups?

07 z71 silverado
01-30-2011, 05:37 PM
On my old truck I went from a 3.42 to a 4.10 and the difference was definately felt and the time's showed it as well. I ran mid 13's on motor in a cam only 5.3 3200 stalled bolton 2007 ecsb 4x4 silverado and 12's on a 100 shot with a race weight around 5300lbs.

L$X$10
01-31-2011, 04:47 PM
most of my driving is through stop lights and stop signs...so i would think the 410s would help me out at speed lower than 45(lock up)
but race weight is around 3400lbs with me in it and bolt-ons include CAI, ls6 intake manifold, ported 78mm tb, longtubes, x-pipe, electric cutouts, underdrive pulley...thats all i can think of(may be missing one or two minor things)
here is a full mod list in this vid, its the exact 11 sec pass
http://www.youtube.com/watch?v=ldavAL6q9LU

s346k
01-31-2011, 08:22 PM
a hooking 1.79 60' is pretty sad for a car (or truck haha) trapping 109. you need a real converter with a stall speed at or above 4000 rpm. a hard hitting converter would do you a world of good. the gears don't have anything to do with the slow 60'. i had a 2000 a4 slowmaro that went high 1.6x with just a lid and 4k stall...and DRs of course. stock everything else, including 3700lb raceweight and 273 gears. stock tune, stock susp, intake, etc etc.

get a good converter, forget the gears, you don't need them. also, going to 410s with a 4l60 will really limit you when you start making power. you'll be juggling tires and shift points to avoid shifting to OD.

green28
02-01-2011, 06:33 AM
Well do you want to go for the record or do you want to save 1 MPG? I lost maybe 1-2 MPG going from 2.73 to 3.73 and lost about the same going from a stock stall to a 4K stall. I think your money is best spent on a bigger stall and suspension work if needed to lower that 60 ft. After daily driving my 4k stall I'm glad I didn't get anything smaller, it really woke my car up.

L$X$10
02-07-2011, 12:43 PM
thanks for the input fellas...i will give Dave a call soon to see about bumping that conveter up to a 4000 and might put a shorter slick on to get a little more gear

senicalj4579
02-07-2011, 12:47 PM
most of my driving is through stop lights and stop signs...so i would think the 410s would help me out at speed lower than 45(lock up)
but race weight is around 3400lbs with me in it and bolt-ons include CAI, ls6 intake manifold, ported 78mm tb, longtubes, x-pipe, electric cutouts, underdrive pulley...thats all i can think of(may be missing one or two minor things)
here is a full mod list in this vid, its the exact 11 sec pass
http://www.youtube.com/watch?v=ldavAL6q9LU

thats a pretty sick truck:nod: