Like the topic says,It wont shift, period!. Will a transgo shift kit correct this? I hear they incorperate a self cleaning throttle valve. I also hear that i would have to putt the trans to check if a hole needs to be plugged. MAybe its more effort then its worth for an old tranny

 

welcome to the club! nope, a transgo shift kit will not solve the problem...as ive tried that approach. im all out of ideas. rebuild is the only option i have left

 

don't worry Curt. We can go to a junk yard, get some corvette servos and rebuild both our trannys

~Matt

 

Had the same problem.

Converted to a th350.... No more problem.

 

nice. Did you do the swap yourself? If so, how long?

~Matt

 

When I had my 700 rebuilt it would not shift under power, and I bitched on this post about junk Trans-go stuff, bitched at the builder, my buddies, the wife and dog too. Finally did some searches and other here suggested dirty valve body, listened to freinds and against my better judgement bought a can of Sea-Foam tranny additive. Whatever it did it cured my problem (flamers read: MY PROBLEM!) and worked great ever since, WTF $6, then I too, swapped in a TH350-me and the motor are much happier with new times at track. Used the Hurst change over kit, took 45 minutes to swap trannies, I had a long tail 350 so all stock components bolted back together. Very good kit.

 

yeah, i would consider it, but i like the streetability of the 700r4. plus with taller gears you save a lot of gas milage

ps. tried the valve body thing(actually got a new one)...didnt work..

 

The "streetability" of a th700 is nice (odrive) But only if the thing works right.
After trying this that and the other and reading about all the other peoples atemps to cure this common problem.
Even reading about others that totally rebuild their trans
fro big bucks, just to have exactly the same pesky 23 no shift
@wot. I did the math and went with the trusty th350.
My gas mileage is not as good as before but hasn't gone in the toilet either. I also installed a B&M 3600 stall converter.
My valve springs are getting a lot better mileage these days.
Was busting one a week from overreving the motor from the no shift. I had the th350 rebuilt for the price of the Tax I would have paid to *attempt* to fix the th700 for.
I can buy a lot of gas for the money I saved and will save.
I had to buy a drive shaft $50 and a change over kit $120(CAN)
I think I made the best choice overall.
I plan to remove the shift kit and corvette converter and servo
fron the old th700
and sell them off (their still good used parts, making this a practically no-cost fix.

 

no no no no no the 700r4 is the only way to go for the daily driver/weekend warrior type car. In my 85 i went throught hell getting the darn thing to do anything...i've rebuilt it, let's see....,4 times and replaced it twice. finally blowing it for the 7 time i went the only way that i'd recommend to anyone..replacement with an later model 700r4. Get a 700r4 out of an 88 or later and have it rebuilt. if ya got some extra $$ then throw a shift kit in . i can't believe it took me so long to realize the problem...and the shifts are mad tight..my body dood twisted his wifes neck with mine when he got on it pullin out of a driveway she couldn't turn her head for 2 days
...not ...that that's a good thing....but...lol


think it over

 

oh... ive been planning on tossing the 700R4 since day one. What a pile. Im thinking of going weith a t-56 if i can get the mony. My friend suggested the t-5 but ive heard everything from "it survives my big block" to "my 2.8 just blew the wc t-5 i have"so im skepticval of using it . The only thinbg the t-5 has is its a direct swap. I only with there was an affordable way to get a good strong manual that wasnt a pain to install.

 

In most cases the Trans-Go Peformance Shift kit along with the Corvette servo, and larger boost valves will solve the 2-3 WOT "no shift". I have no problems with the 2-3 WOT shift in any of the 700R4's I build.

 

I agree with Probuilt, i have my trans set up as if it came from probuilt and i have NO problems with it not shifting from2nd to 3rd under full throttle on my TA. Now my Camaro is another story, i have yet to build it like probuilt.

 

Pro built I know you remember me complaining about my 2-3 shift with the Trans-go reprogrammer, .500 booster valve, the servo above the corvette servo, but not the HD servo, and 3-4 upshift sleeve. It was something in the valve body sticking, I'm convinced of that cause after I put the bottle of sea foam in my 2-3 shift problem was cured, so all that other stuff will help, but, might not be the answer. I know YOU did'nt build mine so it might not have been "perfect" but I'm still on the side of trashing the 700 inplace of a 350, 400, or 4L80E if you want a "good" tranny. There is just waay to big a jump in 1-2 gear ratio in the 700, and alot of horry stories not only from the few people on this site, but everybody else in the world that has owned one. That's why your in business. I imagine you also see your fair share of other trannies also, but I'm always hearing and reading about people with 700 probs. Most don't have the money to have a probuiltautomatic rebuild done and that's just another check mark against the 700.

 

Just a little food for thought. The reason that you hear about problems with 700's is that is what is in the 3rd Gen cars! Also, before we were "getting rich" off of 700's <VBG> we were sopping up the gravy on 350's and 400's. In most cases I would say that they did not last as long as the typical later 700 does before it's first O/H. Also the 4L80E is MUCH more expensive in every way, not to mention heavier than the others. Another things is, I don't know about where you are but 350's have been obsolete for years. Once in a while we will see one come in but as far as parts they stopped making them in @1981 (350C) and parts are getting scarce. Also you have to remember the real cost is (Rebuild #1 + Rebuild #2 + Rebuild +3, ...)/ number of Years it lasts Total + Agravation Factor. I have seen people go through several of any type Transmission, until they get one that has been done right. Often a more expensive job initially turns out to be the lowest cost one in the long run. Conversly the most expensive ones are always the ones that started out the cheapest. Never fails! Have a nice day now!

 

The reason we hear soo much about the 700 is because they came out in 3rd gens,, yes, plus pick-up's, vans, and passenger cars. GM addressed some issues in the later models, but anytime you start talking 700r4, people always get a puzzled look on their face, cause at one time or another they've had or known somebody who's had problems with it.
4L80E being more expensive, yes because is is a better tranny and much stronger than the 700, I'd try to say it's like comparing a th400 to a th350, but the 700 is such a lower grade and has a poor gear ratio spread I can't even do that. And since you are the one always telling people to spend their money once and be, don't start contridicting and by saying they're expensive to rebuilt, if you want overdrive, "spend the money for 1 good rebuilt."
Leo, Leo, Leo, you need to get out of the shop more or stay away from the parts washer, 350 and 400 parts getting scarce? Have you ever looked online, in magazies, speed catalogs for 350-400 parts, hell even power glides have a wide assortment and they quit making them a real long time ago. I guess it's gonna be a hard adjustment in the racing community & people who want bullet proof trannies to make since 350/400 parts are scarce and 4L80E are too expensive, the Transfix leo 700r4 tranny will be the only one left on the market, do I have to place the order now?, or should I just wait when parts become obsolete for the 350/400 in the next 50 yrs or so? But maybe by then I'll have takion your advise and spend the money once and have the 4L80E redone.
It's almost Friday, so yes I'll have a super day.

 

So we never got a definate answer about this problem? My old Camaro 85, had this problem I never got it figured out now its my brothers problem. But it's odd my early 83 "caprice 700r4" transmission thats in the firebird never had this problem, it shifts out of second @5200, 63 MPH every time (with the 305) and this transmission has never been touched except for the transgo kit. It shifted fine before the kit BTW.
Im thinking its probably debree causing this problem. Theres only soo many things that can cause this and if increasing the pressure with a vett servo can fix this then we have a blockage issue some were. Isnt it possible a misaligned/incoorect valve body gasket could cause a restriction and do this or a weak spring?

 

All of which leads back to my original suggestion of adding some Sea-Foam to the tranny, $6 WTF, I had the exact problem you stated and like I said in the above post, I'm convinced it was a sticky valve in the valve body, cause after dumped it in and took the car out and drove it per instructions on the bottle-I don't know if it was an act of *** or if the stuff really did clean out a varnished/clogged port/piston but it miracuously shifted 2-3 at any rpm that I chose. For christ sake man, quit being like I used to be (I hate remedy in a can cause I don't believe in them-until now) questioning, bitching and moaning, getting pissed cause it won't shift right, just buy the stuff and dump it in and see what happens-what are you out, $6 and the time it takes to go to the parts store, it sure won't hurt the tranny none. If it does'nt work post back here and I'll send you a check if you prove the reciept, that way your really not out anything. Everytime someone posts this question transfixleo and probuilt automatic are sure there is always a greater cause than what it "might" actually be, hence their rebuild it, rebuild it, rebuild it,...I've never had that problem with the ones I've built, and that stuff in a can is a horse remedy it doesn't actually fix the problem.
Like most people on the site we have'nt been blessed with a pro built or transfix leo tranny, and don't get me wrong those guys know their ****, so don't think I don't respect your knowledge, but sometimes when you know too much the obvious becomes obscure. I gave the example of my car is running rough, blah, blah,blah and i put injector cleaner in it and it cured the problem, now if someone has the same exact problem as i had, would you at least try a bottle of crap and see if it helps or "tear it apart cause somthing is'nt right" Try the easy cheap method before you start forking big dollars over for extensive trouble shooting.

 

ok tranny experts, quick question: At what speed should a stock auto LG4 700R4 shift at(4500rpms)? With my cam, i shift at 5250rpms and i get out of first at 50mph. And i shift out of second at 5000rpms which is 85 mph then. After that my speedo ends. Thanks.

~Matt

 

ill try the bottle, what the hell, worth a shot. Dont know if itll remove all the sludge. I changed out the fluid over the weekend and now the fluids all cruddy again so this things on its way out. Lol, it took three months to discover this because the car sees nothing but easy commutes to school and back. On the same token, im probably gonna get a t-5 for the car, no sense in geting a t-56 when i have an aneamic 350 in a daily driver. Dont have the money, anyhow.

Edit: lol, its me, dimented24x7. This is my frinds comp.

 

IHI,

Not trying to get in a pissing contest, only to give some perspective here. I don't know how long you've been in this but I remember doing P/G's and 300's on a weekly basis. The 350 and 400 were our moneymakers back then and it was typically at a much lower mileage than you see 700's failing. I like them but ALL Trannies have their problems. If it wasn't for that I wouldn't have a job. Yes the 400 parts are still readily available but 350? I am not talking kits, etc. I mean hard parts. With the exception of some high end parts everything else is used and getting older by the day. As for 4L80E's I am on my way in early (it's 4:30 AM) to go work on one of these dream units. Just gotta wait for the 30 pounds of replacement hard parts to show up to finish it. The other is a 2002 4L80E that is virtually melted front to rear. Yes, melted. Don't forget the upwards of a grand you will pay just for the computer to operate it. If you can afford it, go for it but trust me, they are not as good as people think, at least not until some major changes have been made. By the way, do you hear me selling anybody any Trannies? No. If someone wants one fine but it seems most are from somewhere else and I don't ship units. Dana can have all that, thank you. So don't insinuate that I am here telling you all this to get a sale. If you don't believe what I say, fine. I have been posting less and less if you haven't noticed because I am tired of taking crap on occassion for trying to help and share 25 years of experience, free of charge so order up that 4L80E and computer and get on with it. Let me know what you think when parts start literally BREAKING as happens in @90% of the 4L80E's I do (quite a few, by the way).

As for additives, fine, go right ahead. If I recall I responded in earnest to know how long it would stay "fixed". I have seen BIG problems with additives. I have a theory that if something is sticking there is a reason. Now in the 700 there is a Valve that is prone to sticking and there is a FIX, but alas, it cost some money and time. A fraction of an O/H by the way and that is why I chose to share the info. I guess I should just have waited for the Trannies to drop and get the whole job rather than give out the info. As for other Valves sticking it is usually because something is coming apart and if you don't fix why that is it will only be a temporary fix. Again, it's only $6, go for it. Most people use additives so that they get something working long enough to sell it, by the way.

 

can anyone answer my question?

~Matt

 

It just depends on gear ratio. My car shifts at a lower speed then yours at the same RPM because I have 3.42's. Some transmissions shift early/late due to improper Tv adjustment or improper governer setup but if you shift where you do thats were your supposed to. I dident look at your sig but if you are supposed to have a stock transmission the MTV upshift valve wont allow you to shift that high from 1st. The MTV makes the transmission shift from 1st to second even if the car is locked in 1st @ 4500-5000 RPM.