Which gears to go with - Chevelle Tech
Performance Our High Performance area

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 #1 of 48 (permalink) Old Jan 27th, 14, 3:10 PM Thread Starter
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chris
 
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Which gears to go with

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. Most my cars have always been stick so not much experience with em. He said in his opinion it would be the best of both worlds since this is a daily driven car. Not to mention the price was amazing for a built converter for my app less than what I was about to spend at edge or for the used one so couldnt argue much so I ordered it.

Now onto the last step since I have made the decision to go built TH350 and what converter to use. I am ordering a posi unit with it but need to know what rear gears would be great for me.

Heres what the car will be used for daily driving with some freeway not a whole lot no big cross country trips planned. The car has 28 inch tall tires on it and tht wont change even the new ones coming for the ralley rims are 28 inches tall. Want something tht feels nice and solid and fun to drive as well tht can hold its own and surprise a few people lol

Its a 1970 chevy impala weighs round 3890 pounds with a built 355, afr heads, jones custom hyd roller 228/228 576 1.6 intake/ 512 1.5 exhaust 108 lobe sep, 105 in center 111 ex center. 680 quick fuel VS carb, 1 5/8s long tubes and 2.5 dual exhaust
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post #2 of 48 (permalink) Old Jan 27th, 14, 3:35 PM
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Jeff
 
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Re: Which gears to go with

I was debating same thing when I decided to switch from the 8.5 10 bolt to the 9in mine got solved for me as cost was a big factor I went from 3.42 to a 3.70 only cause that was what came with the rear. I had been looking at 3.50 for the 9 in and that is what I figured would be a good compromise till I get a 2004r myself. I have a th350 now.
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78 Malibu, 402, th350, holley sniper EFI, 9" 3:70, Hoosier 26X8.50-15 slicks.
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post #3 of 48 (permalink) Old Jan 27th, 14, 3:46 PM
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Re: Which gears to go with

Figure the highway RPM that is tolerable and install that gearset. With the 350, I was going with 3.08/3.07. With the 2004R on order, I'm going with 3.73. Should give me ~2000RPM @ 60 MPH.

RPM=MPHxDiff gearx336/tire diameter
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post #4 of 48 (permalink) Old Jan 27th, 14, 3:47 PM
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Re: Which gears to go with

So if you already ordered a converter, what gear did you tell them you were gonna use?

That's an important piece of information if you're having a converter built specifically for your application.
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post #5 of 48 (permalink) Old Jan 27th, 14, 3:49 PM
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Re: Which gears to go with

Quote:
Originally Posted by ElAviator View Post
Figure the highway RPM that is tolerable and install that gearset.

RPM=MPHxDiff gearx336/tire diameter
That is true.
I know mine was running 3000 rpm at 65mph with 2400 stall and basically stock th350 with the 3.42 gears.

78 Malibu, 402, th350, holley sniper EFI, 9" 3:70, Hoosier 26X8.50-15 slicks.
69 VW baja 1600cc.
96 chevy 1500, tow vehicle.
03 yz85 fun bike.
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post #6 of 48 (permalink) Old Jan 27th, 14, 4:22 PM Thread Starter
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chris
 
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Re: Which gears to go with

He said with the converter I am going with tht any gear between 323 and 3.55 would be negligiable in its effect on the converter I told him I hadnt bought the gears yet and didnt know which but id know within a couple days and he said to just call him and let him know they are round a week out from having it ready an cant start it for 3 days hence why im asking u guys now lol
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post #7 of 48 (permalink) Old Jan 27th, 14, 4:24 PM Thread Starter
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chris
 
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Re: Which gears to go with

Quote:
Originally Posted by ElAviator View Post

RPM=MPHxDiff gearx336/tire diameter
With 3.55 TH350 28 in tall tire comes too 2980 rpm tht doesnt seem to bad 3.73 may be a bit much though
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post #8 of 48 (permalink) Old Jan 27th, 14, 5:00 PM Thread Starter
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chris
 
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Re: Which gears to go with

I called and talked to Tim at PTC to get his views on gears an with my combo and useage. An he said quite frankly the performance differences from a 3.23 and a 3.55 are very slim and would be hardly noticable but the rpms on freeway would be more of a noticable thing and he said a nice 3.36 would be good as would a 3.42 and would probably go with whichever he found the best price on.

3.36 gears equal 2822 rpms

3.42 gears equal 2872 rpms
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post #9 of 48 (permalink) Old Jan 27th, 14, 6:36 PM
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Re: Which gears to go with

I voted 3:42 for compromise between daily driver/performance.
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post #10 of 48 (permalink) Old Jan 27th, 14, 9:40 PM
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Re: Which gears to go with

3.42 is my vote. The rpm from 4.11 to 3.73 is minimal. Make enough power and you'll be ok. I run 27" tire currently and the rpms are up there on the highway. But 0-130 is a hell of a lot of fun.
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post #11 of 48 (permalink) Old Jan 27th, 14, 9:48 PM
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Re: Which gears to go with

Chris..with the limited track time and over all cruising in mind I would opt for the 3.55 gear and I`m teetering on wether the 3.73 would actually be better.
That`s a portly little car you got there and every bit counts.

BigRed is a little on the hefty side too and I have 4.10`s
Tim at PTC, as does the rest there, knows what`s up...GOOD CHOICE

Steve
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post #12 of 48 (permalink) Old Jan 27th, 14, 10:23 PM Thread Starter
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chris
 
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Re: Which gears to go with

thanks steve i really enjoyed chatting with him and after we talked he said your converter would be great if i had a BBC but since I got a SBC that this other would be much better suited.
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post #13 of 48 (permalink) Old Jan 28th, 14, 4:10 AM
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Re: Which gears to go with

with 3.73:1 rear gear ratio and a 28" tall rear tire height, you'll be reving at about 3,150 RPM at 70 MPH which isn't too bad for a car that won't see any interstate travel, and that would be a good gear ratio for the camshaft you have. 3.55 gears wouldn't be a bad choice either, and you'll rev at about 3,000 RPM at 70MPH with them.

http://www.richmondgear.com/index.ph...on-calculators
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post #14 of 48 (permalink) Old Jan 28th, 14, 11:23 AM
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Re: Which gears to go with

If you plan to OD later....3.73 is the MINIMUM, you do not have a computer-controlled engine that would like lugging at 1500 rpms

some thoughts
I ran 3.42 in my 454 Elky for years w/3000 B&M converter, little different power to weight ratio here. Cruise was 2700 at 65ish. The 454 and 3000 stall was plenty to get my #3995 race weight car solidly into the 11s

am sure with you in you 70 IMP, you push 4000# too. Less engine, lots less torque....err to the side of MORE GEAR if perf is important to you more than cruising.

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o SOLD 8/2016 my beloved 1970 Elky 496.
o 68 Vette 427/M-20/3.36 23 year owner

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post #15 of 48 (permalink) Old Jan 28th, 14, 11:32 AM Thread Starter
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Re: Which gears to go with

An thts true and want the best of both worlds I weigh 236 in off season with a 8 to 10% bodyfat ( I bodybuild keeps me busy lol ) on season I get down to 4 to 5% bodyfat and trim down to 215. An I have done some weight removal on the car to the tune of 250 pounds and have about 250 more ill be removing all without changing the appearance and such. When i got it with AC and all it weighed in at 3942 pounds as it sat. Its now round 3890 with me in it.

I am thinking overdrive in the future but also a 12 bolt as well when I do so maybe just some cheap gears for now hummmmmmm decisions
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