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04-27-2005, 03:16 PM
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72GMC51
Join Date: Jul 2004
Location: Minnesota
Posts: 233
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3:73 or 4:11
Well time to do the rear end, I am going with a Eaton posi new bearings etc, the question I have is do I keep the 4:11s or do I go to 3:73? I have a 350 bored 30 over, with a mild cam (RV2) headers etc, and a 700r4 trany.
Whats your experiance/opinion Thanks JC
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72 GMC 2wd 1/2 long 350 700r4 A/C PS PB 4:10. Are they ever really finished 
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04-27-2005, 03:31 PM
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Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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I have 3:73's cruise rpm is good in OD, tends to shift too soon round town so stay in 3rd. Maybe this rpm calculator can help you make a decision. http://www.700r4.com/speedoCalc/rpmcalc.shtml
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The truck... you hear that? No really, you did hear that?!!! |
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04-27-2005, 05:15 PM
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Hittin E-Z Street on Mud Tires
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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If you want driveability, decent gas mileage, and lower highway rpms I'd go with the 3.73. My truck does just fine with it (stock 350/700R4/3.73). You can even tow heavy loads with it. I've always considered a 4.11 to be a super heavy hauling gear or a gear you would use for acceleration at a track. My truck does the same as 'wings, I have to leave it in 3rd around town, tries to shift into OD at about 35-40mph. It's up to you but if you have the 3.73 I'd go with it.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride  American Born, Country by the Grace of God  1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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04-27-2005, 05:59 PM
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Resident Young Old Dude !
Join Date: Jul 2001
Location: Nevada
Posts: 1,948
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I've had 4:10s for about 11 years..
It depends on how much highway driving you're going to doing. If you live in town and that's your cruise/play area, then keep the 4:11s, They're fun. if you're going to be on the highway at any kind of a regular timing, then go the higher gears, They really chew the fuel up and the Motor's taching pretty high even at 55.... I'm contemplating on switching over to 3:5s I have 35 miles of 65 MPH highway just to get to town... |
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04-28-2005, 08:35 PM
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72GMC51
Join Date: Jul 2004
Location: Minnesota
Posts: 233
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Well the 4.10s it is, thanks chickenwing for the rpm calculator link, it really help. Most of my driving will 40 - 60 and I like the rpm range.
JC
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72 GMC 2wd 1/2 long 350 700r4 A/C PS PB 4:10. Are they ever really finished
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04-29-2005, 03:16 AM
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Registered User
Join Date: Apr 2005
Location: Chula Vista, California
Posts: 495
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A lot will depend on what size rear tires you are running. 50-series or 38" gumbo
mudders??? rwgregory
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rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed |
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04-29-2005, 05:38 PM
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#7 | |
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72GMC51
Join Date: Jul 2004
Location: Minnesota
Posts: 233
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255-70-15 BF Goodrich Radial TA
JC Quote:
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72 GMC 2wd 1/2 long 350 700r4 A/C PS PB 4:10. Are they ever really finished
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04-29-2005, 06:16 PM
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,143
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3:42
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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04-29-2005, 06:57 PM
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Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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I run 4.10 gears and the 700R4 with 26.5in tires, I have no issues cruising the highways with the gears, I have also run the 3.73 gears with these same profile tires but going into OD with the lockup really took a lot of of the engine, the 4.10's kept a lot of that Tourqe still there. If you just using the truck for tooling around and arent looking for an advantage point at the lights or arent really going to be pulling any heavy loads or heavy trailers go with the 3.73. If on the other hand you like the acceraltion factor or doing some heavy hauling the 4.11 gears arent all that bad with the OD trans, cruise at 70 with 28in tires is going to be around 2400rpm
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" Last edited by Bowtie67; 04-29-2005 at 06:58 PM. |
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04-29-2005, 08:07 PM
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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My truck has a stock 350/TH400/4.11's, running on four 31/10.5/15's, and it does great around town. I don't like driving it on the highway, it's running at least 3200rpms at 65. And that rear end whines like he!! after 60 anyway. When I finally wear down those 31's, I'm going with 235/85/16 BFG's out front, and 33/12.5/16 BFG All-Terrain T/A's out back.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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