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#1 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Gear options and how the do
I have a 3.73 in the 66 with a crate vortec head motor with a small cam and a 700R4. Its just a cruiser and would like to pull some gear out. I have a 3.42 and a 3.08. The 3.42 would pull 10% off the cruise rpm and the 3.08 20%. Would like some feed back from you guys running theses two gears and what you think of your setup and how it does. I am thinking 3.42 but the 3.08 would make it really highway trip friendly.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,904
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Re: Gear options and how the do
the 3.42 is the best choice in my opinion. I have a 3:08 in my 94 with the overdrive and anytime I get some hill action it wants to kick out of OD. My other truck is a 3:42 and it just cruises. In fact I think the MPG is just a hair better normally.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Gear options and how the do
Any idea on the weight difference on your two trucks? I would think the 94 may be 500 pounds heavier.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#4 |
Registered User
Join Date: Feb 2015
Location: San Diego, CA
Posts: 409
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Re: Gear options and how the do
I wouldn't go any less than a 3.42. Just my opinion.
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#5 |
Post Whore
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: Gear options and how the do
3.42 is as tall as you need to go with an OD trans. Unless you add another 100 cubic inches to that motor.
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1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#6 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,200
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Re: Gear options and how the do
I think 3.73 is the right choice.
I always default to 3.42 for non-overdrive applications and 3.73 with overdrive. K
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#7 |
1965 Chevy C10, 2005 4.8L/4l60
![]() Join Date: Aug 2004
Location: DFW Texas
Posts: 8,543
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Re: Gear options and how the do
I agree with Keith, I have the 3.73's in my truck with the electronic version of the 700 ( 4L60e) it really helps with my small v8 and also allows for quick acceleration when needed as well as highway cruising at 75 with good mileage.
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#8 |
Registered User
Join Date: Apr 2014
Location: Union City, CA
Posts: 384
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Re: Gear options and how the do
I have 3.42's with my current build. In the past I have used 3.23's, 3.42's, 3.73's and 4.10's.
The 3.23's came stock in my 2000 Automatic Camaro. 3.42's came stock in my other 6 speed manual Camaro. They both did very well behind the LS1. 3.73's also did ok both at the track and on the freeway, but as a cruiser I like the 3.42's. |
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#9 |
Registered User
Join Date: Jan 2011
Location: CA
Posts: 772
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Re: Gear options and how the do
Not sure if this helps, but, I ran a 2.43 (yup 2.43) in my 51 chevy car with a non OD trans. I would cruise at 80+ and while it didn't have a lot off the line, it was plenty with a slightly build 350.
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#10 |
Registered User
Join Date: Feb 2013
Location: Columbus, MS
Posts: 444
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Re: Gear options and how the do
I have 3.08's behind a really stout 383/700R4 set up. It cruises great and though it'll still burn the tires, I'd go with the 3.42's. I plan on switching from the 3.08's to 3.42's this spring. 3.42's seem to be the best of both worlds IMO.
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#11 |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: Gear options and how the do
PGSigns-
I'm really interested in hearing about your combo, as I am building something very similar to yours. I also have a 350 with vortec heads, and I'm running a decent hydraulic roller (222/230 @ .050, .509/.528 lift on a 112 lobe center), a 2200 stall converter, along with 3.73 gears (31" tall rear tire). What is your cruise rpm at freeway speeds? Are you getting decent mileage? I really gave a lot of thought between the 3.42 and the 3.73 gears, and wound up going with the 3.73 because I already had it available. I plan to upgrade to a posi later, and if I choose to go with a higher gear ratio, I'll swap out the 3.73.
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#12 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Gear options and how the do
I'll look at the cam card tonight and see what is was. Mine is the 95 to 2000 vortec crate engine with the hydraulic roller, aluminum duel plane intake. Edelbrock thunder avs 650 and a MSD ecurve. My tire is not near ad big as yours. I think mine are 28.2" tall. Driving it back and forth to work I get about 14 mpg. 20 miles from house to work and 24 stop lights. Sucks some days. Runs 2000 rpm at 65 mph. Trans is a 700 with a Ron Francis lock up controller set about 46 to 48 mph.
Jimmy Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#13 |
Registered User
Join Date: Jan 2013
Location: Las Vegas, NV
Posts: 1,853
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Re: Gear options and how the do
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