farm-kid/88camaro

Im having some problems with my tranny shifting way to late from 1st to 2nd
What i have is a supposivly "built" 700R4
i know there is a vette servo in it for the 1st to second shift.

Right now, under normal acceleration the tranny will only shift around 5000 rpm by letting off the gas abit, the shift is also not nearly as neck snapping as it used to be. If i hammer on it, it doesnt even shift at around 6000 rpm.
I have adjusted the tv both fully in and fully out to with no good results.
This happened when tuning the carb, and the TV cable was never touched and worked fine before.
The fluid level appears fine
If anyone can help me out i would much appreciate it

Thanks in advance
Jon

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88'Camaro
305 TBI

transfixleo

Tuning the carb? I thought it was TBI? If you do not have the correct induction system, and therefore correct linkage hookups then the geometry is likely off for the TV linkage.

JoelOl75

If you are using proper geometry (correct bracket, TBI...) possibly you broke the cable at the pan. This would cause full TV line if the checkball is there. Drop the pan and inspect the cable hookup.

If that appears OK after having someone press the gas while you look at it, drop the valvebody and dissasemble the works out of the TV hole. The valve all the way in the back has a habit of sticking. http://angelfire.lycos.com/pa4/camaro350/tvvalve Grind the small tit off the end and make sure to put the kicker spring back on it. http://angelfire.lycos.com/pa4/camaro350/tvgrind

Also be sure the valve drops freely in and falls freely out of the bore. You can chuck it in a drill or a dremel with the chuck and run it on scotchbrite pad until it does.

I'm not saying this is definatly what the problem is. It could be a number of things. But the tv valve sticking is common.

If this does nothing remove the governer and make sure the gear is ok and the weights move freely on the shaft. http://angelfire.lycos.com/pa4/camaro350/governor


[This message has been edited by JoelOl75 (edited June 26, 2001).]

bbtaz97

iTrader: (3)

my built trans shifts at 5500 rpm when im on it. but 6000 is awaful high i agree..

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91 camaro RS
- 305 TBI
Mods: Performer TBI intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter, b+m trans cooler, white guage faces, megashifter..
next month: spohn LCA's and panhard rod, BMR relocation brackets, 323 gear, lt1 cam , 350 heads

farm-kid/88camaro

Alright to set things strait, this is a carb set-up, i guess i should update my signature. I believe i have the tv cable hooked up correctly to the linkage on the carb, as before the trans was shifting perfect.

I pulled the pan to discover the tv cable is intack and working.

Now what i dont understand is how to get the tv valvebody dissasembled to inspect it. Must the entire piece on the bottom of the trans be removed to get at it? The piston that is visable by the tv linkage is moving fine.
Im sure I understand what your talking about with the governor so i'll check that, but need some help on the valve body side of things.


Im hopeing its just the sticking valve, as it just happened all of a sudden.

Thanks for the help Joel
Its much appreciated
Jon

JoelOl75

I'd check the governor first since it's alot easier. Usually the prob with these are no shifts out of 1st, but possibly somethings jammed up in there.

As for the TV valve, yes the whole valvebody must come down http://www.angelfire.com/pa4/camaro350/valvebody, wires must be disconnected, if your is an aux valvebody remove the x-over tube and loosen the bolts around the perimeter and work your way to the middle (tighten opposite) Once you have it dropped down there's a roll pin holding everything in there. You could use a pick to help them out (there's alot of valves in there, make sure to remember the sequence and direction as you take them out) The possible troublemaker is the one all the way in the back. It should fall right out.

Hopefully this doesn't turn into a waste of time as there are alot of things it could be like crossleaks or a burned band. My tranny started out with extremely high shift points it seemed, but only got worse becomeing a 1-2 flare over 6000 rpm and I had to let off the gas a little to catch 2nd. Here's a pic of what the band looked like after I took it out... Right into the rivets! http://www.angelfire.com/pa4/camaro350/burnedband

Hope everything works out for ya.

farm-kid/88camaro

Joel,

I pulled the cover for the governor, all appears fine with it.
So then i went and pulled the pan and the valve body. The TV valve appeared fine and moved freely within its bore. So from there i figured maybe it was stuck and after loosening the valve body bolts it may have come loose. Its all back together now. Test drove it, and the problem is still there.

Im begining to wonder if its not maybe the servo. The trans used to hit very hard into second and now you can hardly feel it. There is currently a corvette sevro in it, is this at all a possibility that it could be bad?

Im running out of ideas, any help is appreciated.

Thanks

farm-kid/88camaro

I think its a little worse than i thought

After driving abit, i've found that the reason its not going into second is because there is no second to go to.

The trans shifts from 1-3 and even when do manually skips 2nd.
When i pulled the pan there were no traces of metal or anything, and before this the trans had been shifting very well.


Now im not a happy camper.
hopefully this doesnt mean a rebuild.

Pro Built Automatics

Do you still have 4th gear?

farm-kid/88camaro

Yes I do still have 4th and i am positive of this.
Its weird, this trans only has around 1000 miles after being rebuilt, and was suppost to have been rebuilt to handle more than 700 hp. Something doesnt seem right when a 350 can break it.

Thanks for trying to help

JoelOl75

It sounds like the split teflon o-rings on the servo are torn/leaking since you still have 4th.


I would inspect all of them closely. There's also one that fits inside the housing (not pic'd) for a total of 3 teflon seals and 2 rubber o-rings (red/housing, blue/cover)

I'm hoping this is your problem as it's an easy fix.

farm-kid/88camaro

I removed the servo and all the seals appeard to be in great shape. Although you did say there was a teflon seal inside the housing? I could seem to find this one, what should i be looking for.

On the rod (not sure what its called) that holds everything together, the pointed end seemed to be a bit beat or ground up. So i thought maybe this was the problem and didnt worry about the seal i couldnt find. I took the rod out of my other trans which has no damage and put it in.
There was however a difference between them. The one in the trans thats in the car had the teflon seals like you pictured, although the one i took out of my old tranny had no seals and no place for them.

I put this all back together after changing the rods and now i cant seem to find 2nd or 4th, whereas i was sure i had fourth before.

Could the difference between the two rods make a difference?
Im thinking i might take the whole servo assembly out of the old tranny and put that in the new one.

It starting to sound more and more like its gonna need a rebuild but i really hope not.

I appreciate your help

transfixleo

Even though the band is common for 2nd and 4th gears, the servo's aren't. The piston that goes into the cover is for the 4th apply, while the one that goes into the sleeve is for 2nd. The 4th sevo can travel farther than the 2nd servo can if the band/drum are worn. This give you 4th but 2nd.