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#1 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Should I bother with another 700R ?
I am on my 2nd 700R and wondering if I should just get a 350 or 400 built rather than blowing up these 700Rs. I have all the correct line pressure settings and brakets.
My main concern would be the RPMs I am going to turn with a 350 or 400 3:73 gears and 275 60 15 rire. Would it be alot more ? Just looking for opnions.......
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#2 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: Should I bother with another 700R ?
Man I would think you should be able to get a 700 to live...They are not the strongest as you and everybody knows but it doesnt look like you are asking for too much with your setup? I would question your previous 700's
Dave If you are planning on driving this much I would stick with the OD...
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#3 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Should I bother with another 700R ?
You've blown up a second one??? I remember the pics from the first one... gruesome
![]() It would be 30% higher at highway speeds in 4th gear. The 700R4 has a 0.7:1 final drive ratio which equates to a 30% gear reduction. The 350 and 400 have a 1:1 final drive ratio. Basically if you're turing around 2300rpms @ 75mph (which is what my truck runs 350/700R4/3.73) then with a 350 or 400 you'd be turing about 3K rpms. I've killed a 700R4 as well. If the next one blows "untimely" I'm swapping for an NV4500 if I can even find one! To ensure long life of my next tranny I'm going with an external cooler, Bowtie overdrives TV made EZ kit and lock up kit.
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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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#4 |
Registered User
Join Date: Sep 2002
Location: DFW Texas
Posts: 2,270
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Re: Should I bother with another 700R ?
I went through 3 of 'em behind a 425 hp small block. I gave up.
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#5 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: Should I bother with another 700R ?
I am having doubts about mine as well. At 65mph I am at 2400 RPMS. I think I should be at a much lower RPM than that. I have a 396BB with a 3.07 rearend. Also the it seems to shift from 1st to 2nd really fast. The T.V. cable is set and I even took off the pan the make sure it's set a wide open throttle. Think it would be the governor? I have a lightweight governor in there right now. Do you guys think putting a heavier one in will help?
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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#6 | |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Should I bother with another 700R ?
Quote:
Something isn't quite right. Are you sure your tach or speedo is correct? I have a 3.73 rear and at 65 my truck is turning right about 2 grand. With the 3.07 your truck should be turning like 17 or 1800 rpm at that speed. The 3.07 also may be too high of a gear for a 700R4 (even new full size trucks with OD only come with a 3.42 as the highest gear) With gearing that high I'd definately leave your truck in 3rd when driving around town and leave it in 3rd until you at least hit 50 on the highway. How does it fell on the highway? Does it feel sluggish and underpowered?
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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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#7 |
FORD is a 4 letter word.
Join Date: Feb 2006
Location: Western NY
Posts: 99
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Re: Should I bother with another 700R ?
cwilkie-
Sounds like your converter might not be locking up. Be careful because a 700r4 doesn't route fluid to the cooler until the converter locks. Check this out for a good article on converter lockup logic: http://diy-efi.org/gmecm/papers/tcc.txt 72Mario- wanna see what R's you'd be turning- Put it in 3rd gear & drive around a while. 3rd is 1:1 in a 700R like 3rd in a TH400 or 350. The preferred trans is the 4L80E which is basically a TH400 with overdrive. However, in order to run it you need a computer & wiring harness or a very costly adapter harness. I've had a 700R behind my 406 for about 60k miles & don't have any complaints. 2nd gear is the weak link so I put in a corvette servo to boost the 2nd gear apply band holding pressure. Nice firm 1-2 shift for about $25. No shift kit in mine because they usually last about 20K in the 700r4's before stuff gets hammered and it shifts like crap. Granted, I know that a 700R isn't the strongest slosh-box around, so I keep that in mind while driving. However, the life of any tranny is a function of how you drive it. No transmission is going to like neutral drops, brake torques, and flooring it off the line at every light. I'm not saying that your driving habits puked the tranny, but if you want to kick the hell out of it, I'd put in the TH400 or 4l80e. If you want to cruise- 700R4.
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'71 406 GMC Short Box Fleetside - Daily Driver '79 350 Chevy K-5 Blazer - On-going Project (Mudder)www.wnyoffroad.com '58 LT1 Chevy Short Box Step Side - Next Project |
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#8 |
FORD is a 4 letter word.
Join Date: Feb 2006
Location: Western NY
Posts: 99
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Re: Should I bother with another 700R ?
My 88 chevy van had a 700R4 & 3.08's.
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'71 406 GMC Short Box Fleetside - Daily Driver '79 350 Chevy K-5 Blazer - On-going Project (Mudder)www.wnyoffroad.com '58 LT1 Chevy Short Box Step Side - Next Project |
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#9 | |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Should I bother with another 700R ?
Quote:
It's been hashed out on here several times that a 3.08 or 3.07, or whatever it is, is a tick on the high side for these trucks. Not to say it isn't done, nor is it wrong, but the "general consensus" that with a 350/700R4 the best gearing for these particular trucks is a 3.40's something or a 3.73 ![]()
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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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#10 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
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Re: Should I bother with another 700R ?
wheel diameter will also greatly impact the rpms an engine is running. I don't have the link with me right now, but there's a website that you can use that will calc rpm based on axle gear, transmission gear, and tire/wheel height. I think the math is pretty accurate. I used it to calc my current setup, and my future setup. It was pretty handy to figure out what pieces I could install now and keep with my future setup.
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"Green Monster" (Red Sox fan) 1970 GMC survivor, 350/200 4R, 3.42 rear gears, 2.5/4 drop, ECE disc brake conversion, powder coated suspension |
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#11 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Should I bother with another 700R ?
www.fbperformance.com go with thier 4STB prostreet tranny no tvcable no lockup bull full manual shift just about bullitproof to 900HP
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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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#12 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Should I bother with another 700R ?
Man oh man, you guys are scaring me, I looked at a New one for
around $1600 that was rated up to 650 hp, but now I'm un sure.
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#13 |
Registered User
Join Date: Nov 2005
Location: Jeffersonville, Indiana
Posts: 23
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Re: Should I bother with another 700R ?
I recently put in a 700r4 from Bowtie and it is turning aroung 1500 rpms at 65 mph. I have 3.08 rearend and 275/45 20's all around. Speedo gears were ordered and they appear to be working right.
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#14 |
Senior Member
Join Date: Jan 2005
Location: Loveland Co.
Posts: 3,098
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Re: Should I bother with another 700R ?
kafn8d, 1500rpm is too low for a 700R4 to be running in OD. They need to be at least around 2000rpm. I just don't want to see you kill yours.
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Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html Last edited by powell72; 07-27-2006 at 08:38 AM. |
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#15 |
Registered User
Join Date: Jul 2006
Location: Reno, NV
Posts: 14
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Re: Should I bother with another 700R ?
I made a similar mistake by putting a TH350 which is about the same strength as a 700R4 behind my Mildly built Big Block and it gave up so I found a 400TH, much better to hell with OD unless you use it to travel long distances on the Highway
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#16 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Should I bother with another 700R ?
My truck with a 350/TH350 and 3.73 combo turned exactly 3200 rpm at 70 mph. Ya'll are startin to worry me about going overdrive now. Check these guys out.
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#17 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Should I bother with another 700R ?
I have a 72 K10 with a 3.73 hooked to a TH400 through a G.V. OD tranny and I turn 2100rpms at 75 mph. I like the combination for strenght and lower rpms. When I'm in the woods I just turn the OD off.
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#18 | |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,118
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Re: Should I bother with another 700R ?
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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#19 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: Should I bother with another 700R ?
Gas is still 108 here. I drove the truck daily in the summer. I like to open up the truck after a hard day at work. So I kinda beat on it. Never off the line just a few WOT shifts. But I dont think I have ever got a really good 700R built for me yet.
I have a 350 here and money is way too tight to pay 1600-2000 for a well built one so it might make it's way in (getting married and home ownership)....... would'nt it be cool if my MPG gets better with a good working tranny ?
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#20 |
FORD is a 4 letter word.
Join Date: Feb 2006
Location: Western NY
Posts: 99
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Re: Should I bother with another 700R ?
3.42 rear gears + 255/70R15 tires + 700R4 + TBI 406 = 1650RPM @ 65MPH, 1200RPM @ 45MPH, 16MPG City/21MPG hwy.
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'71 406 GMC Short Box Fleetside - Daily Driver '79 350 Chevy K-5 Blazer - On-going Project (Mudder)www.wnyoffroad.com '58 LT1 Chevy Short Box Step Side - Next Project |
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#21 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: Should I bother with another 700R ?
After a little brainstorming I found out at an actual speed of 65mph the odometer in my truck was reading 53mph. So when I was going an actual speed of 65mph the RPMs were at 1800. Which is awesome. No I just need to correct my speedo gears.
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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#22 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,275
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Re: Should I bother with another 700R ?
There are a number of tire, gear, tranny calculators available to calc what you may need. www.richmondgear.com/streetcalculators is only one. Easy to see how much rpm changes with taller tires or lower gears or plain 3 speed trannys or OD trannys.
What you are going through is exactly why I will not be running any OD trans in my 69. I want a simple T350 for mine. Currently has a 4.11 but will eventually move to a 3.08 gear. Good all around gear. Gas pricing is a major deciding factor even for an occasionally driven truck.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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#23 |
Registered User
Join Date: Jan 2006
Location: Highlands, NC
Posts: 138
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Re: Should I bother with another 700R ?
I destroyed 5 700r's behind a mild daily driven 406. Two of them were built and three of them were stock but they all sucked equally. I will never buy another one. Just my two cents.
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'70 GMC SWB step-side- 454, 4 speed, air bags (in progress) '09 CTS-V M6 '03 Sierra SWB Z71 '82 Yamaha Seca XJ650R Turbo! '04 Yamaha FZ6 |
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#24 |
Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,891
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Re: Should I bother with another 700R ?
I love 700's but I have broken a few over the years(I broke most of them with the wrong convertors). 72MARIO I wish you weren't so far away I could get you a nice 700 built!
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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#25 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Re: Should I bother with another 700R ?
TH400 is the way to go!
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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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