Which gears to go with - Page 3 - Chevelle Tech
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View Poll Results: which gear set
3.23 5 5.10%
3.36 5 5.10%
3.42 25 25.51%
3.55 23 23.47%
3.73 40 40.82%
Voters: 98. You may not vote on this poll

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post #31 of 48 (permalink) Old Feb 13th, 14, 4:00 PM Thread Starter
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chris
 
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Re: Which gears to go with

well the converter is an 11 inch custom and is a 2800 stall and its already in the car and like yours feels stock under normal driving. I already have new 215/75/15 tires for winter new and i already bought the 275/60/15 for the car for summer fall and spring and they too are 28 inches tall. So i will not be changing tires even my slicks are 28 inches tall so no worries with tht either. Only thing to determine now is rear gears which im really on the edge of 3.36 or 3.55 with my limited freeway usage Im really thinking the 3.55 would be the best way to go and give me great round town and track useage and if 3k is bout where id be with them i could totally live with tht. My old LSX camaro with a built 560 rwhp LS7 and six speed inc 6 speed had 4.56s and i drove tht daily and would drive it too wendover to race 2 hours away and in 6th it was going 3k rpms at 80-85 and never bothered me and that car was a loud beast dual 3 inch exhaust out magnaflow mufflers 2in primary headers 254/268 at 630/640 0n a 111 .050 speced custom cam. Man I miss tht car shoulda never sold it
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post #32 of 48 (permalink) Old Feb 13th, 14, 7:55 PM
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Re: Which gears to go with

Quote:
Originally Posted by 70imp355 View Post
well the converter is an 11 inch custom and is a 2800 stall and its already in the car and like yours feels stock under normal driving. I already have new 215/75/15 tires for winter new and i already bought the 275/60/15 for the car for summer fall and spring and they too are 28 inches tall. So i will not be changing tires even my slicks are 28 inches tall so no worries with tht either. Only thing to determine now is rear gears which im really on the edge of 3.36 or 3.55 with my limited freeway usage Im really thinking the 3.55 would be the best way to go and give me great round town and track useage and if 3k is bout where id be with them i could totally live with tht. My old LSX camaro with a built 560 rwhp LS7 and six speed inc 6 speed had 4.56s and i drove tht daily and would drive it too wendover to race 2 hours away and in 6th it was going 3k rpms at 80-85 and never bothered me and that car was a loud beast dual 3 inch exhaust out magnaflow mufflers 2in primary headers 254/268 at 630/640 0n a 111 .050 speced custom cam. Man I miss tht car shoulda never sold it
==========

Well its a lot diff story dealing with 3k rpm at 80-85mph cruise speed in your old camaro then with your current car thats got a looser perf converter with non od auto trans & 3:55's with & 28" tires would be a considerably slower cruise speed at the same 3k rpm being roughly 65mph (+ - few mph) with the looser then stock perf converter your running adding 200rpm + - to cruise rpm.

3:36's are still my choice for best comprimise between reasonable cruise rpm and decent track perf too since your car will be seeing primarily street use and with little non competitive strip use.

Too bad 3:42's arent avail for your 10 bolt because they would be a very good choice for perf vs reasonable cruise rpm.

There isnt that much diff between 3.36's and 3.42s being kind of a wash cruise rpm wise,but there will be a more noticeable diff between 3.36's & 3.55's when talking cruise rpm.

The question you need to ask yourself is do you think you will benefit more from (or enjoy driving car more) having less cruise rpm every minute/all the time your driving your car locally at 55-60mph (not to mention if you hit interstate once in a while) with 3:36's or if you will enjoy driving the car more with higher/more cruise rpm all the time your driving the car with 3:55's just to have bearly noticeable inc in perf a couple times yrly you take the car to the strip.

Good luck either way you choose to go.

Scott

SCOTT
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post #33 of 48 (permalink) Old Feb 13th, 14, 9:01 PM Thread Starter
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Re: Which gears to go with

After thinking about it and weighing the pros and cons I think the posi with the 3.36s will be the way to go ill have a nice cruise on the interstate with the 28 in tall tires and converter and i bet if you were able to try the 3.36 and the 3.55 one right after the other at the track I bet the difference wouldnt even be a 10th of a sec
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post #34 of 48 (permalink) Old Feb 13th, 14, 10:57 PM
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Re: Which gears to go with

3.36s and 3.42s are really the same gear for all practical purposes. If you have an 8.2 rear, they don't make a 3.42. If you have a 12-bolt, they don't make a 3.36.

I have 3.36s with 215/70R14 tires. It revs a bit, but is still a comfortable ride at 70 mph. It doesn't loaf along like a 2009 Impala or something, but you can live with it. I agree that there would be virtually no performance difference between 3.55s and 3.36s. When I went from 3.08s to 3.42s in a '70 Nova I used to own, there was no difference in ET (all runs were within 0.1 sec). I'd go for the 3.36.
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post #35 of 48 (permalink) Old Dec 23rd, 14, 1:12 AM
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Re: Which gears to go with

I went with 3.31's and switch between 27" street tires and 28" dr's. I run down the freeway at 2800-3000rpms most of the time. Also have a 10" PTC converter that flashes to 3800. The street tires are worthless for traction below 30mph .

I still would not build a 10 bolt so good luck with yours. Any of those gears will be fine and a big step up from the 2.56's.

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post #36 of 48 (permalink) Old Dec 23rd, 14, 9:47 PM
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Re: Which gears to go with

Quote:
Originally Posted by imp-oster View Post
Well I posted up bout trans a while back and after alot of trying to come up with the funds for a 200r4 or a 700r4 its just not in the cards at the moment. Maybe down the line it will be something for me to consider but its just not feasible right now. Besides even if I could get together the money for a built 700 or 200 id still need my gears and stall which would definitely not happen. Id have to use some POS crap stall to get me by til I could afford a good one to match my combo. Then add in the extra parts needed new speedo connector thinga ma bob, new 200 or 700 dipstick tube, lock up wiring kit, T V cable, shorten the driveshaft (if I went the 700 way) and relocating the rear trans mount and shipping just kept adding up. I found a few great companies like extremetrans tht I could get it all for round 2100 plus 150 shipping, or jakesperformance which was round 2250.00 for just trans plus shipping, and then davids was round 2345.00 and then shipping plus all the lil add ons as well. These all didnt include a torque converter tht was trans alone. Then add on gears all the nick knacks and such and i was closing in on over 4000.00 for everything good stall, trans, all the trans goodies, cooler, rear end bearing kit, posi unit, and good gear set.

So since I have a brand new built turbo 350 tht cuts tht cost right there, I was gunna get a very nice PTC converter from a nice guy on here but after calling Tim and chatting he said it wouldnt be the best for my application. But he said he would build me a great 9.5/11 inch dont know how to explain it he said its the best of both worlds looks like a 9.5 inch but its an 11 or something he said something about the vanes being set up for heavy cars and it flash stalls to 2800 rpms but driving around town i wouldnt even know it was in there and its double balloon this and that I dont speak converter.
Did you get converter for 700R4 yet if not i got one that out performs the PTC and Yank i had.

PM if interested.

1Super69
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post #37 of 48 (permalink) Old Dec 25th, 14, 10:42 PM
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Re: Which gears to go with

Look at the calculators on wallaceracing.com and do the math. You don't want your converter slipping at cruise speed and building up heat. Also a good trans cooler is a must. Your 10 bolt will survive as long as you can spin your tires, shouldn't be a problem since this is a street car. Good luck with your build.
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post #38 of 48 (permalink) Old Jun 19th, 19, 3:19 AM
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Re: Which gears to go with

Wow, an old poll vote, 2014, someone's been digging....

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post #39 of 48 (permalink) Old Jun 19th, 19, 7:23 AM
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Re: Which gears to go with

I said 3.42 but missed it being an Impala, so I;d bump that to 3.55. If little freeway, then 3.73, but they'd get tiring at 70 mph.

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post #40 of 48 (permalink) Old Jun 19th, 19, 10:30 AM
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Re: Which gears to go with

Quote:
Originally Posted by 427L88 View Post
I said 3.42 but missed it being an Impala, so I;d bump that to 3.55. If little freeway, then 3.73, but they'd get tiring at 70 mph.



3.73 is a joy at 70 after removing 4.56 gears
I was cruising 70 with 4.56 and 27" tall tires. sometimes i stuck my 29" tall tires on.
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post #41 of 48 (permalink) Old Jun 19th, 19, 12:47 PM
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Re: Which gears to go with

Jeff, I have issue cruising with my 3.31s and 27.75" rear meats at 75 mph. It because OD trans have "jaded us".

Its goofy how much more "pull" the car has with the short 25.5" slicks on. ( which numerically is near 3.7:1 ). Plus, they dont spin, they just "giddy up". More fun!

MIKE, GOOD CATCH! I guess as I teach finance part time, being "academic" is par for the course.

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post #42 of 48 (permalink) Old Jun 19th, 19, 2:04 PM
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Re: Which gears to go with

in the early 80's I had a 71 Chevelle with a 355 that made 450 HP Muncie 4spd and 3:73 Geared 12 Bolt with the old Ladder bar set up. 29" tall L60's . (damn that car sat way high... it was the look back then) That was a very good gearing for that car.. had pretty much an all around ability, could cruise at 60-65... and yet scoot light to light.

a 3.42- 3.55 with a 28" tall tire is a nice gear ratio for all around performance with a TH350..... Keep in mind the TH350 has a lower 1st gear than a TH400, so you dont have to go as tall on the rear gear to get the same off the line performance, which could give you a little bit more breathing room for cruising. FOr this reason, I vote the 3.42 for your combo, but a 3.55 would work nicely as well.
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post #43 of 48 (permalink) Old Jun 19th, 19, 7:45 PM
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Re: Which gears to go with

[QUOTE=427L88;11097178]Jeff, I have issue cruising with my 3.31s and 27.75" rear meats at 75 mph. It because OD trans have "jaded us".

I have only owned 2 V8 vehicles with OD transmissions.
A Ford E150 at 6000 lbs and 302" 2 barrel engine I built, 3.50 gear 29.5" tire..I could not use the OD too steep and vehicle slowed down. 2700-3100rpm and 17+ MPG


Another was a 1994 dodge 3/4 ton truck with 360" and fuel injection.
10 MPG no matter what and it was only 4200lbs. POS if you ask me.


OD does not thrill me at all and I only liked the 2004R as I seen many last behind fast cars and that did not hold true for the 700R4 or 4L60 stuff.
But this 4L80 intrigues me.


So with all that said I have not been spoiled by the OD transmission and most of my MPG cars are 4 cylinders and they stay up in the RPM So I am used to seeing 3000 or more.
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post #44 of 48 (permalink) Old Jun 19th, 19, 8:23 PM
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Re: Which gears to go with

Quote:
Originally Posted by Ialone View Post
Keep in mind the TH350 has a lower 1st gear than a TH400, so you dont have to go as tall on the rear gear to get the same off the line performance, which could give you a little bit more breathing room for cruising. FOr this reason, I vote the 3.42 for your combo, but a 3.55 would work nicely as well.
Iím sorry to be the bearer of bad news. The difference in first gears between a turbo 400 and 350 is precisely 0.806451612903% or imperceptible. A 700R4 is significantly more and would give you the advantage you are thinking of. However the gear drop from first to second is awkward and can leave you out of your power band.
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post #45 of 48 (permalink) Old Jun 20th, 19, 10:17 PM
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Re: Which gears to go with

Having had 331s in the Chevelle with the TH350, a 410 in my no od hot rod, and a 273 in my Capri, C4, loose 10 in 2300 stall, i am spoiled for od.

With the tko and 373 gears the Chevelle is ok at 80 ish cruising. This will keep up with most traffic in the southeast, except the Tampa area.

If no od, I would go 273 or similar.

Over the weekend we did 600 or so miles of FL interstate in Bullitt, 373 and T3650. I would turn around at the five mile mark without my od.

On a fun note, one Prius passed us and got pulled over..

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