First let me say that i've already searched here, and i actually asked this question once before as well, but there weren't as many experts running around then. What i'm getting at is, if all you can suggest is i'm getting close to rebuild time, keep it to yourself, i know there are other causes for this and that is what i'm investigating. The tranny has 30-40k (forget exactly) on a rebuild from a dealer. May have even been a replacement, not sure (bought from first owner w/ documenattion but i didn't memorize it, lol.) and other than this *intermittent* no 2-3 @ WOT it's the most perfect tranny i have ever driven. I wil not believe that it is going to die anytime soon.

Anyhow, on to other causes. I remember reading in some petersen rag a few years ago that 700r4s are notorious for having some valve in the VB stick causing a no 2-3 shift at WOT. This sees much more likely, as i said, it's an intermittent problem and the tranny is otherwise *perfect*. Now, what valve(s) is it and how do i fix it? I have an SLP shift kit that i'm almost ready to put in, but i'm not touching my tranny till i am ready to fix this problem as well, i'm only dropping the VB once.
If anyone could recomend a good reference on 700s i'd appreciate that too.
...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

Thank you, i posted the same thing a few comments down Im having the same exact problem........... Can someone [please help us

Cody


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Wieand blown 87 camaro

 

I'm in the smae boat as you guys, but somebody told me its not that simple, that this is casued by a blown clutch-pack and that requires a rebuilt.

I fanybody knows of a deiffernt way to fix it I would loe to hear it because I have no $$$ for a rebuild right now.

-Max

 

The 3rd gear feed hole from the factory is on the small side .076-.096 with some minor variations. The other problem is that there is a checkball capsule in the input drum that does not seat itself (due to centrifugal force) when the rpm's get up around 5,000-5,500 rpm. (1) By using the .500 main boost valve you are adding more flow and this will help seat the valve. (2) Use the Trans-Go Performance Shift kit, it enlarges the feed hole too .155-.187 (2.5-3.5 times more oil to the 3rd gear clutches). (3) If you are going to go into the 6,000 rpm+ range then I would plug the checkball assembly thereby eliminating this problem all together. There still is a small hole to bleed off any excess oil that accumulates in the 3rd piston apply. If you install the Trans-Go Performance Shift kit it will give you all new heavy duty springs for the forward and 3rd gear clutch packs, these springs prevent accidental 3rd gear clutch from trying to come on in 1st or 2nd gear (due to centrifuge) up 7,800 rpm. I use these springs, Trans-Go Shift kits and boost valves in all my transmissions and have no problems with 3rd gear apply. If you have any additional questions, please ask.
Glad Too Help!!!

 

Hey pro built..... I have a B&m shift kit in my trainny now and its oin the same thing i usually try to shift at 6400 -6600 what should i do??

Cody

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Wieand blown 87 camaro

 

thanks...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

The input drum must be removed to add springs or plug checkball capsule. Standing the drum with shaft up you will see a checkball capsule about 3/8" away from the reverse input clutch teeth on the inside. The drum should be completely disassmbled to do this. If you want you can purchase the HD Trans-Go springs from most trans parts houses, you will need to get the part# 7-CS. Put all the springs in do not leave any out. As to the enlarging of the 3rd gear feed hole, you can do this but you will need to block another hole, enlarge another hole and remove a spring. I could send you this info by mail if you decide to do this. The other option is just install the Trans-Go Performance Shift kit, the HD springs come with it. While it is apart you can put in the 8-pack Borg Warner Hi-Energy clutches and Kolene steels if you have not already updated the 3-4 clutch pack. Just a thought. I carry these parts if you cannot locate them, 800 7763288 Mon-Sat 10-6 PST.
Hope This Helps!!!

 

Are there any other causes of this behavior? I've heard broken springs can cause problems?

Mine is similar but not exactly the same. My 700-r4 has 156000 miles on it and it shifts fine 1-2 both at part and full throttle. However the 2-3 shift often slips a lot at part throttle and seems like it won't shift at all at WOT. I haven't noticed any problems with the 3-4 shift (although I have 2.73's in the back so I can't test 3-4 at WOT, that would be 120 mph or so).

I changed the fluid/filter about 15000 miles ago, there were a lot of very very small metal particles in it plus it was burned. The new fluid has not become burned, and there seem to be fewer metal particles now.