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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> My 700R4 won't hold first (low) gear!
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Topic Review (Newest First)
05-30-2006 12:22 PM
Bayley
Quote:
Originally Posted by Jmark
Are you sure that your "barn builder" trans shop used YOUR old trans and not a different one that he had laying around?
I think both you and Crosley are looing in the right areas. I'm starting to think my barn builder grabbed an early model valve body since it "looks" like a pre-87 trans... even though it is an 87.5 trans.

What type of kits come with an etirely new valve body? Like I mentioned in my original post, I tried to use a TCI manual valve body, but that has been an utter failure; 100% TCI's fault.
05-29-2006 12:13 AM
Jmark Are you sure that your "barn builder" trans shop used YOUR old trans and not a different one that he had laying around?

Also, i'll just toss this in, may or may not apply. If you USED to have a shift kit in it and he used stock gaskets on a different shift kit seperator plate, it could mess things up. Reason I say this is because when I did a Transgo 1-2 kit on my TH400, it said I HAD to use the Transgo VB gasket from the plate to the case for it to work correctly. I take that to mean that if I used a stock VB gasket with that seperator plate, it would NOT work the way Transgo designed it.

Mark
05-28-2006 11:35 PM
Bayley
Quote:
Originally Posted by Crosley
Early design 700 tranny will upshift to 2nd gear while the shifter is in 1st.
Yes, but that is supposed to be at WOT. My situation has it where the transmisison will automatically shift into 2nd gear even if I'm idling down the driveway with the gear selector in 1st. This is not the normal operation of any 700R4 I've ever seen before... early or late model.

I must have checked the cable assembly a zillion times to make sure the shifter is indeed pulling the cable far enough to engage 1st gear.

I t just puzzles me that I NEVER had this problem with this same transmission until I recently had the transmission gone through. Did he forget something when he reinstalled the valve assembly?


Quote:
Originally Posted by Crosley
You can do 1 of 2 things;

Install a larger low/reverse boost valve (.296 diameter)... or install a TransGo shift kit...
It might come down to that. I tried installing a TCI manual valve body, but the "fabulous" TCI kit wouldn't engage 2nd or 4th gear (the servo otherwise works just fine). Never mind the fact that it burnt up about $400 in brand spanking new clutchs and bands buring my three mile test drive.

TCI = dog poop


Quote:
Originally Posted by Crosley
Could be mismatched parts
I hope you are wrong... but fear that you are right.
05-27-2006 07:28 PM
Crosley Early design 700 tranny will upshift to 2nd gear while the shifter is in 1st.

You can do 1 of 2 things;

Install a larger low/reverse boost valve (.296 diameter)... or install a TransGo shift kit...

700- 2 & 3 kit , will over ride the command to upshift from 1st to 2nd gear while the shifter is in 1st gear.

IF you have a late 1987 & newer 700 tranny, perhaps the shifter adjustment is out or your tranny builder did something I am not thinking of at the moment. Could be mismatched parts
05-27-2006 06:18 PM
circletrack62 I'm sorry to tell you this, but your trans is doing what it is suposed to do. MOst likely what has happened is your new trans guy just did a simple rebuilt without any kind of shift kit which is how you could shift at any rpm you wanted.
05-26-2006 07:57 PM
Bayley
My 700R4 won't hold first (low) gear!

Many years ago, I had a perfectly fine working 700R4 that performed exactly how I wanted it to. The B&M shift improvement kit gave me nice control over all my shifts at any RPM.

A few years back, I decided to have my trans "freshened up" by a local guy that does trans work out of his barn. Ever since I got the trans back him, I've never been able to "hold" the transmission in first gear. Even with the shifter in "1", the transmission will still shift into 2nd as if it was in "D" (or OD For that matter).

The shift point will change as I give more throttle (e.g. pull on the trottle valve) but still automatically shifts into second. The 1st to 2nd shift is nice and firm... I just wish I could control it manually like I once used to before this last rebuild.

Anybody have any ideas? I am totally stumped. The orignal trans guy is totally stumped (that doesn't say much). The "new" trans guy is also totally stumped (that says even less than the first guy).

The trans is out of 1987.5 Limited edition Z28 with a 350V8. It's right on the transition line of when they swapped everything over. I'm being told I have a late model valve body with an early model case. Maybe it's the other way around, but nobody is sure what I've got. Hopefully this problem is simple to fix.

HELP!!!

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