View Full Version : No power!!!!
94blazer00
10-08-07, 08:41 PM
I finished my 350 swap but my blazer has no take off power. Just for reminders it has 70`s 350 w/700r. Could it be that the torque convertor didnt sit all the way back on the shaft.If so could it be fixed without removing the tranny.Just asking cause a guy told me you could....Thanks
Well... no power could mean many, many things. Could you be more descriptive with the symtoms? You would get more problems than lack of power if the convertor didn't seat properly. I suggest the timing is off, or start with something easy to fix than go straight to the hard stuff.
Mikz86TA
10-09-07, 12:55 AM
X2. But if you need to check your converter here is what you look for. http://www.rosslertrans.com/Converter-spacing.htm
94blazer00
10-09-07, 07:25 PM
Well since i havent got it inspected yet i just went around the block in it.It just seems like i have to give it alot of gas when i take off.I will take it for a longer trip tonight and post back.
Mikz86TA
10-10-07, 12:51 AM
Have you checked your linkage? With it OFF push the accelerator smoothly to WOT and have an assistant looking to see if it starts moving, and if it reaches WOT when you do inside. Just a start other than whats aalready been posted. Let us know
ArticWolf
10-10-07, 04:31 AM
Well with what was said by others I thing it might be due to timing and or carberator problems. If you put it in gear and or I think even in park the converter would make noise, the ones that I have had problems with were full size trucks should be same concept though. The torque converter would just stip the tangs off inside the front pump housing and the tranny just won't work at all. I have had that happen to me twice. In all aspects, I am leaning towords it being Timing and or carberator problems if it computer controlled it's a whole new ball game. There would be the throttle position sensor, map sensor, O2 sensor, pick up coil could also be weak but that is my two cents but I hope I helped a little
Mikz86TA
10-10-07, 01:29 PM
7 Vane pumps with the old spool valve design was the root of the noise in the 700R4s. They fixed it with an updated spool valve or you can modify the one in there. The upgrade to 10 vane pump made them a stronger and also less noisy. Newer kits to 13 vane pumps are now availible and the combination of the vane count and spool valve update make it quiet and reliable. If the converter wasnt properly installed per the link I provided earlier, damage would occur to the trans. I too think its not the converter.
94blazer00
10-10-07, 06:59 PM
I thinks its the 4l60 cause it has no cable just a wire harness where the cable should be. It should be ran by the comp then...right?I didnt remove none of the wiring.I just tied all the wires out of the way that was under the hood.It does have a carb and the engine runs good.I guess something isnt hooked up right for the tranny not to go into od either. I have done some research but all i can find is about the tv cable....
94blazer00
10-10-07, 07:01 PM
Mik i went to that site and the converter is in properly. So thanks for the link it was helpful...
That would be a 4L60E.... what has been called the electronic 700R4. It IS computer controlled shift points and the convertor lockup. Probably the convertor is in lockup even when you take off, causing what feels like power loss. Try hooking it up if you have the proper connector. Hmmm.... 1994? OBD1.... might not work, we shall see.
Mikz86TA
10-11-07, 12:18 AM
X2...4L60E You need a computer to control that one. What PCM are you using or how did you connect the Tranny plug to the vehicle?
94blazer00
10-11-07, 07:06 PM
I just plugged it back in to the tranny.I thought since i didnt remove any of the comp it would be fine.I dont know much when it comes to the comp and wiring. I have a 350 w/shift kit so i just might find a 9" tail and use it.
I don't know if you could just use a non-locking convertor on a 4L60E or not, but that might be an option.
Mikz86TA
10-11-07, 07:22 PM
Youll need the 9" tailhousing and output shaft. The plug on the 4L60E does more than just TCC lockup. Its inputs and outputs to the PCM on shifting it too. Its got shift solenoids
That being the case... it is shifting or he would've noted that, so it is talking to the PCM. I suspect that the wiring may have changed between the two years and it's not unlocking the convertor. Could get a GM wiring diagram and track that down. Probably much easier than sticking in another tranny. :)
ArticWolf
10-12-07, 06:56 AM
ok if I got this right. The motor runs fine but when you put it in gear you don't have take off power, the motor bogs down as if some thing is holding it back it don't take off like it should. Right? Well this is my theory it may be it but....
Being that the computer wasn't connected to the tranny it shifted fine but had no take off power or over drive. kinda sounds like what my tranny is doing, thats if the tranny has been doing this before the swap. The tranny is bad, fluid dark brown and smells burnt thats not good. Now if the tranny worked perfect before the swap then you need a controller for the tranny to work right. There are sensors on the motor IE: map sensor and throttle position sensor (if I'm right) that tells the computer how the motor is running, in turn tells the tranny how and when to shift also called "Shift Timing" and how the tranny should act. "Example" If the motor was running bad the tranny would act accordingly.
Not your case here though, You might need a controller for that tranny to work right. I think Summit carries them but there not cheap. It would be probably be cheaper to get a hold of a 2 wheel drive Th-350 buy an adapter to make it mount in the same place the original tranny did the adapter includes a new output shaft and a spacer to mount the tranny to the transfer case. But I may be saying it's worse than it really is but its just what I think could be the problem but if I am wrong let me know so I don't make the same mistake twice I could be wrong LOL
94blazer00
10-12-07, 08:10 PM
Your right about it bogging and feeling like there is something holding it back.It shifted perfect before the swap.I do have a 350 tranny.It has the 6" tail but i need to get a 9". My blazer is a 2 wheel drive. I think it would be easier to put the 350 tranny in that way i won`t need a comp at all.I have been looking for a 9" tail and output shaft but not having any luck. Thanks for all the info you guys are giving.
94blazer00
10-13-07, 08:38 PM
Just to let you guys know i bought a 350 tranny w/ 9" tail. The guy had reciept showing recent rebuild on it and he said he has only put 4k on it. He let me have it for 100 bucks. So im putting it in tonight and will let you know how it runs.
Mikz86TA
10-14-07, 12:30 AM
sweet.
Um... torque convertor??? You can't used the lock-up convertor on that TH350....
ArticWolf
10-14-07, 04:09 AM
I hope that works out for you. I will always trust a good old th-350 any day they don't rely on line pressure to make them work. You'll loss the overdrive and some gas milage but in my sence, You put a 350 in it you're not worried about gas milage that much. Thats the whole point right, More Power and Quicker :D.
Thats what I want to do with my S-10 Blazer when the 4.3 w die's. Old school 383 stroker, racing th-350, 4x4, Posi Ford 9", "I know "Ford" but I trust these rearends." 4.11 gears, tubed, 4x4 Drag Blazer. :eek: But that is a different storie, that I can never afford, And will always dream about. lol :D
BUMP!
Anything new to report??
94blazer00
10-17-07, 10:25 PM
It took longer than i thought cause i pulled the motor back out. I had a bad oil leak at the very back of the oil pan.I also needed to fix the cut out on the heater box and i cleaned up some of the wires. Still need to get rid of more wires but im unsure what i need to keep. The tranny fit perfect and so did the driveshaft. I need to put the rad support, fender and hood back on then i will test drive it. I`m sure it will run great since it doesnt depend on the comp anymore....
94jimmyman07
10-17-07, 10:49 PM
omg did you really just slap it in thare no wires hooked up and expect it to work lol!!! your going to need an older tranny buddy a real 700r4 with a tv cable (throttle valve) cable
94blazer00
10-18-07, 08:37 PM
I left the tranny hooked to the comp when i installed it. I didnt realize it still needed the sensors from the 4.3 for it to work right. Since i don`t know alot about comp and sensors i dumped it and got a th350 in it now.We all have to start somewhere and learn from our mistakes. I guess there will always be a prick on every board.........
Hammer Head
10-18-07, 08:48 PM
Yea, there is.. usually I'm the dick. You're right, we all need to start somewhere. Hope you at least learned the lesson.. you did learn the lesson, right? heh
bespurcell
10-18-07, 08:49 PM
I left the tranny hooked to the comp when i installed it. I didnt realize it still needed the sensors from the 4.3 for it to work right. Since i don`t know alot about comp and sensors i dumped it and got a th350 in it now.We all have to start somewhere and learn from our mistakes. I guess there will always be a prick on every board.........
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ditto
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