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01-10-2021, 07:03 PM | #1 |
Registered User
Join Date: Jul 2016
Location: Las Vegas, NV
Posts: 116
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700R4 Slipping in 4th Gear - why?
Hey everyone,
Got a rebuilt standard 700R4 w/OD from Monster Transmission 2 years ago for my '70 C10 2WD with a '69 396. Open differential. Been a great tranny up to a few months ago. At low speed in 3rd or 4th, occasionally I felt a shudder and lack of acceleration once warm, then it would grab and go. Fluid level always good, shifts fine, everything else good. But yesterday, about 5 mins into the drive, in 4th about 40 mph, when I tried to accelerate with just normal effort it won't accelerate and the rpm rapidly climbs. Doesn't seem to do that in first 3 gears. I took it straight home. It's still under extended warranty, Monster asked I take it to a local tranny shop here in Las Vegas. Anyone have an idea what this could be? I really appreciate the help. It's been a great 700R4 til now. |
01-10-2021, 08:38 PM | #2 |
Senior Member
Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: 700R4 Slipping in 4th Gear - why?
It is headed south. Time to pull it and do a rebuild.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
01-10-2021, 10:07 PM | #3 |
Senior Member
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,217
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Re: 700R4 Slipping in 4th Gear - why?
Time for a rebuild my friend i try not to talk about about company's but the fact u got 2 years out of a monster transmission is amazing local shop get them in all the time after the fail and monster declines warranty repairing. If u google there reviews they have alot of issuses find you a good local shop to build it and tune it for ur truck.
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
01-10-2021, 10:55 PM | #4 |
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Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,153
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Re: 700R4 Slipping in 4th Gear - why?
3/4 clutch is dying...behind a 396 you were lucky to get 2 years...
Be careful with Monster... What stage trans did you buy? Might be a good time to upgrade to an 4L80e and have it professionally built.... Good luck...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
01-11-2021, 12:00 AM | #5 |
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Join Date: Jul 2016
Location: Las Vegas, NV
Posts: 116
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Re: 700R4 Slipping in 4th Gear - why?
I appreciate all the replies. Oh boy, just looked at BBB complaints, never seen so many in my life. It is a Level 1 firmness, mild factory shift, 1800-2000 torque converter. I'm the only driver and I drive it easy, not hard.
Monster sent me an ATRA.com link to find an authorized shop. I think I'll use Transmission Service Center, them seemed good when I took my old TH400 by when I first got the truck. Motor has a mild cam from PO, prob has about 360 hp is my guess. Only have about 8,000 miles on the 700R4. |
01-11-2021, 03:41 AM | #6 |
Registered User
Join Date: Aug 2015
Location: Las Vegas NV
Posts: 354
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Re: 700R4 Slipping in 4th Gear - why?
If you decide to ditch the 700 for modern, you’ll need a trans controller. I have a 4l80 behind my 67 with a US Shift controller.
Side note, I could have swore I saw your truck driving down Lamb by Pic-A-Part the other day. Nice truck.
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Customization is what you want it to look like -- not what other people think it should look like |
01-11-2021, 04:18 PM | #7 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,690
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Re: 700R4 Slipping in 4th Gear - why?
Gm never put a 700R4 behind a big block for a reason.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
01-11-2021, 05:12 PM | #8 |
Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,153
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Re: 700R4 Slipping in 4th Gear - why?
Tom...never has a truer word been spoken....
Chew em up and spit em out...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
01-12-2021, 10:11 AM | #9 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: 700R4 Slipping in 4th Gear - why?
It's not the HP that hurts them. It's the BB torque
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
01-12-2021, 08:40 PM | #10 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,690
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Re: 700R4 Slipping in 4th Gear - why?
Yup. 600lbs/ft at 1000rpm isn't even 150hp, but it will tear the crap out of your driveline when starting off from a stop.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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