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Old 10-16-2007, 04:38 PM
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700R4 Shift Problem

Hi, guys, I have a problem with my 700r4, it's installed in a Monte Carlo ss With a 355 Chevy with approx. 400hp. Here's my problem, the previous owner rebuilt the transmission and installed a B&M Transpak in it. The car has a quick 1-2 shift, but the 2-3 and 3-4 shift are weird, during the shift, the engines revs climb almost 600rpm before engaging the next gear. Besides that, the transmission seems good, the fluid doesn't smell burnt at all, the color is nice. I've set up the tv cable the right way and using the right brackets for the carb I use.

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Old 10-16-2007, 05:14 PM
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there are numerous things that can cause this however since it flares in 3rd and 4th I may have to say to start looking in the servo area seals or the 4th accumulator piston maybe even the #7 checkball leaking which i personally get rid of . make sure the TV cable as always is adjusted properly may want to tighten it a little and see if this helps
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Old 10-16-2007, 05:17 PM
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Thanks i'll give it a try
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Old 10-22-2007, 04:11 PM
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Anyone else have an idea??
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Old 10-22-2007, 07:33 PM
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Quote:
Originally Posted by chevy_power427
Anyone else have an idea??
the 3-4 clutch pack.

Too loose setup.

burned clutches

cut lip seals or sealing rings

How did the parts performabuilt2 suggested a look see?

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Old 10-22-2007, 08:08 PM
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Are you SURE the TV cable is adjusted right?

You say this trans has a "quick 1-2 shift", do you mean snappy quick or quick as in, shifts at an early speed?

I would do as performabuilt2 suggest, and tighten the cable up a bit, just to make sure.

Of course, there is no shortage of 700's with 3-4 clutch problems either.
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Old 10-22-2007, 08:26 PM
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It shifts snappy quick, I adjusted the TV Cable at WOT.
I doubt the clutch has a problem, maybe I could be wrong, but this problem is there ever since the trans was rebuilt ( that's what the previous owner said).
I didn't really had the time to check out what performabuilt2 suggested, but I will. I never really worked on a transmission, I prefer to gather some information before. I was wondering, if I took out the valve body, and reinstalled a new shift kit in it, along with a brand new separator plate since the old was was drilled for the previous shift kit, sometime I think that maybe the previous owner installed the shift kit incorrectly. Anyways, my car is going into storage this week, then I'll really start tearing stuff apart.
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Old 10-22-2007, 08:42 PM
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well, with a few decades of trans experience under my belt..... I think you have a 3-4 clutch problem.

There may be other problems related to this 3-4 shift problem as I posted ; lip seals cut , sealing rings, improper setup of the clutch pack, servo seal problems, accumulator problems / leakage.

I would guess the previous owner was not a trans professional since the trans had this 3-4 shift problem from day 1.

post back when you can , let us know what you find.

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Old 10-22-2007, 08:59 PM
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Thanks, I'll check the Servo seal and the accumulator. From what I heard, all the transmission was asembled by a transmission guy from a dealership, except for the shift kit that was installed by the previous owner himself. From all I've seen hes done up to now, I had to redo everything myself, that's why I think there's something wrong with his shift kit.....He had to change a part in the accumulator.....there might be my problem. But I'll never know until I check everything, anyways my car will be stored until late may, so I'll have more than enought time to check everything. Thanks for replying!
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Old 10-23-2007, 04:59 PM
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If a servo seal goes bad, would it cause ATF leaks?? Because I have one, I didn't check the servo area, never doubted it before, I always thinked it's the front torque converter seal. This winter I'll be pulling that motor out, and I'll change that seal.
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Old 10-23-2007, 08:37 PM
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I spoke with the guy that sold me the trans today ( happens to be my boss )
He told me the trans came from a V6 powered Astro van, he also said he didn't change the servo, I was hoping he installed the corvette servo in it during rebuild, but he didn't. Could having a V6 Servo in a 400hp V8 700r4 cause that flaring?? I'm just hoping it's not the clutch packs. What do you think guys.
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Old 10-23-2007, 09:35 PM
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Quote:
Originally Posted by chevy_power427
I spoke with the guy that sold me the trans today ( happens to be my boss )
He told me the trans came from a V6 powered Astro van, he also said he didn't change the servo, I was hoping he installed the corvette servo in it during rebuild, but he didn't. Could having a V6 Servo in a 400hp V8 700r4 cause that flaring?? I'm just hoping it's not the clutch packs. What do you think guys.
the servo for a 4.3 v-6 was the same as a v-8..... commonly known as a #553 Servo.

Pull the trans apart to see what parts and how it is setup , report those findings here if you would like. we will offer advice on changes and to repair it....

you can guess at the cause of the problem till the cows come home

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Old 10-24-2007, 07:57 AM
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Old 10-24-2007, 04:34 PM
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I never opened a trans before, I'm intimidated by it. I have a Gm shop manual, a haynes trans manual, and I could get and atsm manual, I got the time too, but i'm just scared to make things worse. I would love to change the clutches and bands for something of better quality, but I could still live with what's in it. Anyways, went to pick up a vette servo and seal kit today, might try it on this week end. Thanks for the help, I appreciate it!
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Old 10-25-2007, 08:47 PM
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changed to vette servo, had a #554 servo in it, also used a superior servo apply springs K004. No more flares, fixed it,i'm so happy it was that simple and cheap. Never doing it in the car again, no space to work. Thanks guys, case closed!
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