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#1 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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700R4 hunting for gear over 50 mph
I have had this problem since I had the transmission rebuilt 6k miles ago but thought it was because I was running 2.8? rear end gears. I took the burb to a different shop and they confirmed I had 3.73 rear gears. I was thinking that once the gears were swapped to 3.73 the gearing would be right and solve the problem but apparently I had 3.73's the whole time. It does have a lock up kit installed. I am going to try to take it to the tranny shop next week but was wonding what you guys think.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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#2 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: 700R4 hunting for gear over 50 mph
I would disconnect the lockup first. If that stops the "hunting" you may have adjustments you can make. It should just be one or two wires on the left side of the transmission.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#3 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,130
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Re: 700R4 hunting for gear over 50 mph
I hope it's not bad, have you called the tranny shop to see if they think it's an adjustment issue?
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#4 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: 700R4 hunting for gear over 50 mph
I am going to take in in next week. The fluid is still pink as can be.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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#5 |
Registered User
Join Date: Oct 2008
Location: Sparta, MI
Posts: 446
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Re: 700R4 hunting for gear over 50 mph
what do you mean hunting for gears? my lockup senses vacuum and will sometimes switch in and out of lockup as engine rps decrease, then increase again.
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1972 longbed- 454 1967 shortbed- 355 |
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#6 |
Registered User
Join Date: Jul 2013
Location: Campton Kentucky
Posts: 11
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Re: 700R4 hunting for gear over 50 mph
idk about your transmission troubles but if it was hunting for another gear with the 2.8 rear gears.... switching to a 3.73 would be worse..... the numerically lower gears (2.8) are for a higher top speed, slower acceration............... while numerically higher gears (3.73) are for lower top speed, fast acceleration vehicles
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#7 |
Registered User
Join Date: Jul 2013
Location: Campton Kentucky
Posts: 11
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Re: 700R4 hunting for gear over 50 mph
do you mean hunting for gears as in trying to shift up or down shifting????
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#8 |
Registered User
Join Date: May 2013
Location: fredericksburg
Posts: 26
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Re: 700R4 hunting for gear over 50 mph
what lockup system are you using ? TV cable setup ?
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#9 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,130
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Re: 700R4 hunting for gear over 50 mph
By hunting he means the trans can't make up it's mind 3rd 4th 3rd 4th etc......
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#10 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: 700R4 hunting for gear over 50 mph
Is it hunting 3/4 or is it hunting lock/unlock?
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#11 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,130
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Re: 700R4 hunting for gear over 50 mph
HMMMMM.......that's a good question Longhorn. I didn't think of that, I guess that's why there's tranny guys..
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#12 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: 700R4 hunting for gear over 50 mph
Yeah...Good transmission guys are a big asset.
If he disconnects the lockup wire on the transmission, he'll soon find out if it is 3/4 search or lock search for free.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#13 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: 700R4 hunting for gear over 50 mph
I am running a Lokar kickdown and using Painless wiring for the lockup. It can decide if it wants to be in 3rd or 4th at times when over 50 mph. I am going to take it back to the shop.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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#14 |
Registered User
Join Date: May 2013
Location: fredericksburg
Posts: 26
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Re: 700R4 hunting for gear over 50 mph
thats either TV cable adjustment or issue inside trans...now you can have cable adjusted right at closed throttle and the ratio be off and cause issues...it is critical...
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#15 |
Registered User
Join Date: Mar 2013
Location: In the rain
Posts: 17
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Re: 700R4 hunting for gear over 50 mph
More then likely its locking and unlocking. It was one of the main complaints for most people with these transmissions. The problem? Most people cant keep their foot steady when they drive, they drive on and off the pedal, constantly moving their foot. Not saying that is your issue, but a lot of people have that problem.
To check if its locking/unlocking or actually shifting is easy. When driving and you think it has unlocked(or downshifted) drop the shifter down to third gear. If it shift down, it was just unlocked. If it does nothing, it is shifting gears. Probably just a tv cable adjustment is all that is needed. If you are using a factory style cable with the adjustment up by the carb. There is a "D" shaped looking button. Push it in and slide the cable so it is all the way tight, then move the throttle to wot and it should ratchet to where it needs to be. This isnt always perfect, but it usually makes a good starting point. |
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#16 |
Registered User
![]() Join Date: Dec 2012
Location: Chandler AZ
Posts: 1,149
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Re: 700R4 hunting for gear over 50 mph
Well??? Did the shop get that bad boy going?
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
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#17 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: 700R4 hunting for gear over 50 mph
Ok, finally got it into the shop. He fixed a small leak and the lock up. He said it was not drawing enough vacuum at idle and was turning itself off electically if I unerstood him correctly. He also fixed a leak.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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#18 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: 700R4 hunting for gear over 50 mph
So have you driven it yet?
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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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#19 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: 700R4 hunting for gear over 50 mph
I have not picked it up yet. I will let you know once I have driven it.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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