700r4 valve body problems?

On Wednesday, May 15, 2002 9:04:35 PM UTC-4, Loren Knighton wrote:
> >The thing the I most appreciate is that everyone has their own
> >opinion. When I ask for help, I do so because I need ideas to spark my
> >own thought process. I never blindly do things that people advise.
> >Rather I run the opinions through my internal logic filter. The
> >consensus has been that the problem is most likely in the valve body
> >or the governor since the problem is intermittent. I thank everyone
> >for their help. Now I will focus my troubleshooting attention in those
> >areas.
> >
> >Rocky
>
>
> Say Rocky:
>
> When you git this beast sorted out-kindly let us know what worked for you..
> Thanks.
>
>
> Respectifully submitted,
>
> Loren Knighton
> Woodland, CA.
> IATN, TRNI
> Under the hood since 1964

My '84 Suburban 6.2 diesel 700R4 4 speed OD was shifting fine, tho never had lockup, then on a trip back from Michigan to Adirondacks (2000 miles total), it quit shifting a couple hundred miles from home. It would only shift at way too hi an engine speed, and I tried rocking shifter, stabbing gas pedal, lengetnthing TV cable etc... After 100 terrible miles, finally in 3rd at 40mph, I took an exit to visit some friends that build '32 Fords, and all of sudden it's back to normal!

All was fine for 2 weeks until I jabbed the throttle to junp accorss and intersection, and it's back to thinking I'm flooring it! I dropped the valve body, and removed a few valves, but they're a real bear to remove, and I thot I would do more harm, so I stopped. TV valve seems to move fine. I cleaned everything thoroughtly, and re-assembled, also checked governor, and it's the same. I replaced gov with another one, same, lengethend the TV cable, and same, but now it's hanging in 2nd unless I floor it, then the shift is way late. The pan had zero paper or brass, so I know the tranny is fine. It prolly has 80k.

I need the truck for work, but I basically drive around town in 1st gear, with the occasional shift to 2nd. At 40 it will hit 3rd, but drop back to 2nd at 35. I double checked the TV cable, and changed back to my old gov, and jacked up rear wheels to make sure it's spinning, all is normal. Any thoughts?

wrote:
> My '84 Suburban 6.2 diesel 700R4 4 speed OD was shifting fine, tho
never had lockup, then on a trip back from Michigan to Adirondacks (2000
miles total), it quit shifting a couple hundred miles from home. It
would only shift at way too hi an engine speed, and I tried rocking
shifter, stabbing gas pedal, lengetnthing TV cable etc... After 100
terrible miles, finally in 3rd at 40mph, I took an exit to visit some
friends that build '32 Fords, and all of sudden it's back to normal!
>
> All was fine for 2 weeks until I jabbed the throttle to junp accorss
> and intersection, and it's back to thinking I'm flooring it! I
> dropped the valve body, and removed a few valves, but they're a real
> bear to remove, and I thot I would do more harm, so I stopped. TV
> valve seems to move fine. I cleaned everything thoroughtly, and
> re-assembled, also checked governor, and it's the same. I replaced
> gov with another one, same, lengethend the TV cable, and same, but
> now it's hanging in 2nd unless I floor it, then the shift is way
> late. The pan had zero paper or brass, so I know the tranny is fine.
> It prolly has 80k.
>
> I need the truck for work, but I basically drive around town in 1st
> gear, with the occasional shift to 2nd. At 40 it will hit 3rd, but
> drop back to 2nd at 35. I double checked the TV cable, and changed
> back to my old gov, and jacked up rear wheels to make sure it's
> spinning, all is normal. Any thoughts?


Sounds like a classic bad governor. They get sticky and start hanging up
at various spots. Causes different shift points depending on where they
stick. The sudden changes in shift points and the sudden change when you
stabbed the throttle all point that way. Be sure to use a diesel
governor as they are set up different due to the lower rpm band.

Reset the TV cable as well as those being out of adjustment do bad
things to the 700R4s.

The lack of lock-up could also be causing problems. Being an 84 that
trans is likely one of the 27 spline units, they have a few odd issues
if the lock-up isn't working. Lots of info on that online.


--
Steve W.