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#1 |
Registered User
Join Date: Jan 2002
Location: Henderson, NV
Posts: 358
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Re: 700R4. Love it or hate it?
Love it. It's been in my truck almost 7 years.
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1980 Chevy Shortbed Pickup 1969 Z28 engine Turbo 350 |
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#2 |
Registered User
![]() Join Date: May 2005
Location: Colorado
Posts: 138
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Re: 700R4. Love it or hate it?
I may be reading it wrong, but I think that there is some confusion on what the lock up does. The electric lock up locks up the converter electronically once the tranny is in OD, or in 3rd if you just have it in D. The locking mechanism is designed to reduce slippage of the tranny for lower RPMs which will in turn give you better MPG. with the lock up set up on a switch, then you can lock it up when you are in 3rd for when you are towing. You're obviously not going to tow in OD. You can still go into OD without the lockup, but you will have slippage and eventual failure. I'm not trying to steal the thread, I just thought that this was pertinent information.
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#3 | |
Registered User
Join Date: Sep 2006
Location: Shelley Idaho
Posts: 876
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Re: 700R4. Love it or hate it?
Quote:
Locking the torque converter does get you little better milage it is not the reason for it. A slipping converter can spin anywhere from 200 rpm to 700 rpm slower than the engine, by locking them together they spin at the same rate causing the effecientcy (milage) to go up slightly. I personaly love the 700r4, I am going to put one in my 71 K20 this summer. I had one in my 70 Nova for a while and hated it. My Nova has 3.08 rear and I was using more gas with the 700 than I was with the th350 that was in it before. I am switching to a 3.73 rear when I put a T5 in it. I wouldn't go any higher than a 3.73 unless the engine is fuel injected. Some cars run 3.08 or 3.42(from the factory) with 700r4 but they are usually fuel injected.
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1970 Nova 327/T5 (my 1st car) 1971 K-20 350/350/205 (winter DD) 1953 GMC Suburban 1968 Chevy Bel Air 1976 Chev C-10 1972 Skylark (suncoupe) 1 of 3943 made Last edited by sweet70beast; 02-19-2009 at 12:25 PM. |
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#4 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: 700R4. Love it or hate it?
I may be wrong, but I believe in "stock" form the 700R only locks in 3rd and OD.
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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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#5 | |
Looks good at 20-ft .....
Join Date: Apr 2005
Location: Mtn Home, AR
Posts: 707
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![]() Quote:
I had a nasty-colored (yellow/tan/yellow/tan) '85 Silverado when it was brand new, that I absolutely-hated, because it was always see-sawing in & out of gears between overdrive & third, going up long gentle-slope hills. Got lotsa those in this part of Arkansas. Then somebody told me: Hey dumb*ss, just set the transmission gear selector pointer on the "D" marker, & not the D with the "O" around it, unless you're out on flat highway/freeway....... you'll burn the trans up with all that pointless shifting, & it won't go into the overdrive at all unless you use the "O" marked drive pointer. All was better then. I guess that would be the purpose of a manual lockout / engage switch after a trans swap. Sure made a big difference to me in how much I liked the truck. Maybe I should have read the owners manual, or something, too ?????? We later had a '92 Buick Roadmonster (that's the color I used for my pickup) with the same 350 engine & 700 OD trans in it, that my wife drove most of the time, and we hardly ever used the overdrive, unless out on the road on long trips. Same "see-sawing" in & out of overdrive, otherwise. Last edited by 68shortstep; 02-18-2009 at 05:49 PM. |
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#6 |
Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: 700R4. Love it or hate it?
A little off subject, but I remember something about the 200r not being able to mate with a transfercase, aka, a 4x4 application. Am I making this up or IS it possible using GM parts?
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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#7 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: 700R4. Love it or hate it?
^700R's are NOTORIOUS for wanting to shift in OD early. With light acceleration mine will shift into OD at about 40-45mph. Way too slow of a speed. That's one of the reason's I love my Lokar floor shift. I drop it into 3rd and leave it there until the truck hits about 50mph or so, then I bump it up into 4th. If I do city driving where I almost never hit much over 40-45mph I just leave it in 3rd.
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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! Last edited by 67ChevyRedneck; 02-18-2009 at 06:06 PM. |
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#8 |
Gearhead
Join Date: Jan 2008
Location: Colorado
Posts: 1,193
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Re: 700R4. Love it or hate it?
I have my trans set up with the Jet Performance vacuum switch kit and have no problems what-so-ever with the locking/unlocking of the torque convertor, seems to operate as it should to me, basically seemless til you hear the RPM's drop.
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2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644 Last edited by 6772owner; 02-18-2009 at 10:33 PM. Reason: text |
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#9 |
Registered User
Join Date: Nov 2008
Location: San Jose Ca
Posts: 265
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Re: 700R4. Love it or hate it?
I searched but didnt fond anything meanful
you have a link for the Jet Performance vacuum switch kit |
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