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08-01-2004, 10:42 PM
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#1 |
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Registered User
Join Date: Dec 1999
Location: Pittsburgh PA
Posts: 291
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700r4 question
does anyone know why my 700r4 is going into overdrive as early as 25 mph ? is there any way I can correct that problem easily ? thanks
Cliff
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1972 Custom deluxe 305/350 C/10 8-foot bed with 1/4 inch diamond plate steel bed floor. |
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08-01-2004, 10:52 PM
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#2 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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I don't know if 700r's have lockup torque converters like TH350's, but if it does the torque converter is locking up too quick. My Granddad's 83 Silverado had the same problem. You'd be cruising at 25-30MPH and the engine would start getting lugged down and he'd just shift to low gear when it did that, then shift back to drive and it stopped.
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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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08-01-2004, 11:27 PM
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#3 |
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Registered User
Join Date: Aug 2002
Location: Des Moines, IA
Posts: 154
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I would guess that your cable needs adjusted or replaced. Check this link.
http://purplesagetradingpost.com/sum...o/700R4p1.html Also good links and discussion under the Board FAQ section.
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72 Cheyenne 2wd LWB 402/350 CC/PS/PB/AC Tilt/Tach (upgrading to 4X4 402/700R4 CC/PS/PB/AC Tilt/Tach PW/PL) 71 Custom Deluxe 350/350 Tilt/PS/PB 00 Blazer |
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08-01-2004, 11:28 PM
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#4 |
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Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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My truck also goes into top gear at 25mph, but I'm still running a Th350. Do you know your rear end ratio? Some of these trucks are just geared to pull & scream on the highway.
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85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days!  05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal! 
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08-02-2004, 01:29 AM
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#5 |
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Registered User
Join Date: Feb 2002
Location: Moore OK 73160
Posts: 974
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it won't shift into 4th gear until it reaches certain speeds. what is is doing is locking up the troque converter to save on gas mileage in town. it should theoretically lock up at 30-35, but could lock up sooner. adjust your tv cable to get it back on track.
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04 GMC Sierra RCSS 70 CST LWB 04 HD Sportster 1200 Custom |
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