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09-11-2013, 04:14 PM
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#1 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Best rear gears for 700r4
What is the best rear end to run behind a stock 350 with a 700r4 auto? Most of my driving will be at hwy speeds. Will a 3.08 be ok?
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09-11-2013, 04:26 PM
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#2 |
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Senior Member
 
Join Date: Apr 2008
Location: Franklinton NC
Posts: 1,309
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Re: Best rear gears for 700r4
Should be fine. The 700r4 has a real low first gear so take off shouldn't be too bad. Depending upon your tire size you may actually end up with a lower rpm at highway speeds than you would like. I say try it then adjust if you aren't happy.
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09-11-2013, 04:28 PM
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#3 |
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Registered User
Join Date: Jul 2007
Location: Silverdale, WA
Posts: 263
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Re: Best rear gears for 700r4
From what i've seen people on the site using, a lot of them do not like the 3.08 because of to sluggish on the highway. Most seem to use 3.73's
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09-11-2013, 04:30 PM
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#4 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Best rear gears for 700r4
most guys over the years have had very bad results and an actual decrease in fuel milage when useing a 700r4 and 308 rear gears// where the guys with the 700r4 and the 373 get best results and fuel milage increases
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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09-11-2013, 04:43 PM
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#5 |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,167
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Re: Best rear gears for 700r4
3.42 is the best ratio with tall tires for a mixed use. If you are pulling more, then maybe 3.73.
__________________
'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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09-11-2013, 05:14 PM
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#6 |
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Registered User
Join Date: May 2013
Location: Central NC
Posts: 830
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Re: Best rear gears for 700r4
I have 3.08 gears, 700r4 trans, 255/70/15 tires, perfect from 60 mph up.
Around 55mph it feels like it is lugging a bit but my "RV" cam doesn't care. I like it, I can't say they are the "best" gears as I haven't run it with any others to compare. My mileage went from 11 mpg with the saginaw 3 speed to around 18 mpg overall (that was with 235/70/15 tires, haven't checked it since I upgraded). Can't speak for others though.
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1972 Cheyene C-10 "Ole Green" My Grandfathers truck (early 70's to 1983) My first vehicle (1983) Original 350 (3 rebuilds) 700R4 from Bowtie Overdrives 
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09-11-2013, 05:30 PM
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#7 | |
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,144
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Re: Best rear gears for 700r4
Quote:
__________________
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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09-11-2013, 06:03 PM
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#8 |
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Senior Member
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: Best rear gears for 700r4
3.73
Posted via Mobile Device |
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09-11-2013, 06:41 PM
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#9 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Best rear gears for 700r4
I run the 700 r4 with 4:10's and get 16-18 MPG depending on how fast I'm running. At Highway speed (70MPH) I'm turning around 2300RPM's.
I like the way it runs and it performs well for a 305!  
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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09-11-2013, 07:11 PM
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#10 |
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Watch out for your cornhole !
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Best rear gears for 700r4
Literally over 75 percent of the 2wd 88-98 trucks that were V8 and 700r4/4L60/e overdrive equipped came stock with 3.42 gears. Perfect ratio. GM got it right on that one.
Posted via Mobile Device |
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09-11-2013, 07:44 PM
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#11 |
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Registered User
Join Date: Oct 2009
Location: Lufkin Texas
Posts: 171
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Re: Best rear gears for 700r4
I am currently running 3.08's and my truck don't like it at anything below 60 mph, I am in the process of switching to 3.73 .
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1965 Chevy Suburban 2003 Chevrolet S10 2011 Harley Streetglide |
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09-11-2013, 07:53 PM
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#12 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Re: Best rear gears for 700r4
Is there a stock 3:42 6 lug rearend option for a 70 model? Thought only 3.08, 3.73 or 4.10 were available
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09-11-2013, 08:21 PM
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#13 |
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Registered User
 
Join Date: Apr 2013
Location: Gainesville, TEXAS
Posts: 658
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Re: Best rear gears for 700r4
350 FI / 4L60E / 3.08's / 30x9.5 tires great setup; take off is not a problem and at speed it works perfectly even with 6000 to 7000 lbs in tow in OD in the hills.
cruising speed of 70 MPH, rpm's are only 1650-1700 and fuel mileage is well above 17 MPG (unloaded)
__________________
1972 Chevrolet Cheyenne LB 1/2 ton finished restoration/rebuild 1995 350 throttle body FI, 4L6E (running on modified GM wiring harness) 3.08 posi rearend, factory A/C on 134A, p/s, p/b, late 70's power windows and locks and cruise, speakers in the dash + 6x9's behind the seat, factory tilt, 40 gallon fuel tank in the bed with integrated tool box, air assist bags on the rearend, sway bar up front and much more. 1972 chevrolet SNB finished 2002, 350 TB FI, TH400, factory A/C, p/b, p/s, (FOR SALE) 1969 Chevrolet 1 ton in work, home made PTO dump bed extended frame, 350 CI , 1972 Chevrolet 3/4 ton suburban future project 1972 Chevrolet 3/4 ton p/u maybe a project one day 1966 Toyota Landcruiser my playtoy |
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09-11-2013, 08:27 PM
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#14 | |
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Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: Best rear gears for 700r4
Quote:
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09-11-2013, 10:08 PM
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#15 |
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Registered User
Join Date: Mar 2001
Location: Paradise TX USA
Posts: 1,200
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Re: Best rear gears for 700r4
My son's 71 GMC with a 350, 700R4, and 3.08 gears is a bit sluggish for my liking. We will probably change to 3.73 sometime in the future.
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"Negative people always seem to have a problem for every solution" |
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09-11-2013, 10:30 PM
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#16 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: Best rear gears for 700r4
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I changed the 3.08 to a 3.73 in the '69 Suburban. Made all the difference in the world.... it has a 2004r OD trans in it. Averaged 16 mpg on a 550 mi round trip to Kansas City, MO last weekend. I'm lovin' it...  LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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09-11-2013, 10:34 PM
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#17 |
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Registered User
Join Date: Apr 2010
Location: Everett, WA
Posts: 504
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Re: Best rear gears for 700r4
My '89 C1500 has a 350 FI, 700R4 and 3.08s in the rear with 31in tires on it.
Thinking of going to a 3.73 since its got a bigger tire on it. |
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09-11-2013, 10:35 PM
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#18 |
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Registered User
Join Date: Apr 2012
Location: san diego ca
Posts: 618
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Re: Best rear gears for 700r4
Great information here my 700r should be installed by the time i get back from vacation.
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09-11-2013, 10:45 PM
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#19 |
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Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,453
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Re: Best rear gears for 700r4
3;73 gears ,28" tall tires nasty 327 / 4L60 street or highway I freeking love it
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60 |
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09-11-2013, 11:55 PM
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#20 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: Best rear gears for 700r4
Quote:
My Burb has 31's on it too. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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09-12-2013, 06:26 AM
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#21 |
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Registered User
Join Date: May 2009
Location: Monroe, LA
Posts: 2,104
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Re: Best rear gears for 700r4
I have a 700r4 and 3.73s in my '63. It is a good combo with my 275/60/15s, but I think that 3.42 would be a good combo too. I went from 4.11 to 3.73, so the difference was significant. I like the gearing currently for quick take offs, and crusing rpm (~2300 @ 70).
I am considering a Monster 700r4/3.42s in my '68 w/ my 427 BBC. It should have plenty of torque to feel strong on take off.
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Keith SOLD - 1963 C10 Short Fleet 350/700R4 4/6 drop 1967 GMC Super Custom - Short Fleet COPO concept w/427 BBC T-400 w/Doug Nash overdrive 4/6 Drop, Buddy Buckets, etc... Frame Off (In Progress) I call it "Vulgar Display of Power" 1980 Silverado Original paint 49k Original miles 4/6 drop Check out my build thread here: http://67-72chevytrucks.com/vboard/s...=1#post6209941 |
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09-12-2013, 07:00 AM
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#22 | |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Best rear gears for 700r4
Quote:
That's the sweet spot. 3.42s weren't offered in these trucks back when needs (for the most part) were different from now. 3.08-3.73 leaves a wide gap and 3.42s fill it perfectly. It's a great ratio for hiway with or without O/D,yet spill has grunt. I'm building my '67 with an M22 and 3.42s and it's a hiway machine who's bed will get used. When I can afford it,a Gear Vendors will go in. This ratio will work either way. I know this is manual/no overdrive talk,but this give perspective on the the range of ratios we're talking. The truck I helped my neighbor with ('68 SWB) has a 4spd and he didn't want it to suck the gas too hard. He went with 3.08s...hated it. Changed to 3.42s and it's good. Now he's got a ZZ3 in there and realizes he just wants a hot rod and,no matter what,it's going to like gas and he's not going to commute or travel in it. So,he's wanting 3.73s now for bit more grunt. If it was me,now,I'd be swappin' 4.11s!!
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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09-12-2013, 10:31 AM
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#23 |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: Best rear gears for 700r4
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So basically the only way to get 3.42's is to use the later, wider rear end and weld on new mounting pads? LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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09-12-2013, 10:36 AM
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#24 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,230
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Re: Best rear gears for 700r4
3.73's are perfect.
The overdrive in the trans brings it back as though they are 3.42's. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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09-12-2013, 10:36 AM
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#25 |
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Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: Best rear gears for 700r4
Does it hurt a 700r4 to drive it in third gear and only manually shift to OD when necessary?
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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