Rebuilding my TH700R4. Newbie with some questions
#1
Senior Member
Thread Starter
Rebuilding my TH700R4. Newbie with some questions
First time I have every worked on this kind of transmission.
Saw a lot of youtube videos, got myself the ATRA Rebuild guide and also have the Factory service manual (to make up for minor differences from the 4L60E).
Transmission was working fine. Didn't use the car a lot before beginning the restoration so I cannot say 100% if it was working as it should or not.
I had some leaks from Input and Output shafts so I got a seal kit (Dacco K77900C).
Started today removing the servo, oil pan, wiring, valve body... First thing I don't agree with what I found. Some of the check ***** are either not present or not in the right place. I will check this with the service manual.
While removing the 1-2 accumulator I slowly removed the piston however to my surprise, there was no spring???
Removed the Auxiliary accumulator and separator plate.
Removed the 3-4 accumulator to find again that there was no spring also under this piston !!!
I have now continued with the rest of the disassembly and didn't find any more dodgy stuff till now. Endplay is well within tolerance. Have to check clutch plate thickness.
Question is, How come the transmission didn't feel bad without those two springs? What should I have felt? I still cant understand the usage of every component in an auto trans.
Saw a lot of youtube videos, got myself the ATRA Rebuild guide and also have the Factory service manual (to make up for minor differences from the 4L60E).
Transmission was working fine. Didn't use the car a lot before beginning the restoration so I cannot say 100% if it was working as it should or not.
I had some leaks from Input and Output shafts so I got a seal kit (Dacco K77900C).
Started today removing the servo, oil pan, wiring, valve body... First thing I don't agree with what I found. Some of the check ***** are either not present or not in the right place. I will check this with the service manual.
While removing the 1-2 accumulator I slowly removed the piston however to my surprise, there was no spring???
Removed the Auxiliary accumulator and separator plate.
Removed the 3-4 accumulator to find again that there was no spring also under this piston !!!
I have now continued with the rest of the disassembly and didn't find any more dodgy stuff till now. Endplay is well within tolerance. Have to check clutch plate thickness.
Question is, How come the transmission didn't feel bad without those two springs? What should I have felt? I still cant understand the usage of every component in an auto trans.
#2
Senior Member
Thread Starter
Re: Rebuilding my TH700R4. Newbie with some questions
Searching further on the internet I found that at times people rebuild these transmissions and remove the springs from the accumulators to put sleeves instead. Mine has sleeves also.
Apparently this will result in stiffer shifts at WOT.
Do you guys think I should put back the springs or leave the sleeves there?
Apparently this will result in stiffer shifts at WOT.
Do you guys think I should put back the springs or leave the sleeves there?
#3
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Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: Rebuilding my TH700R4. Newbie with some questions
recommend the transgo kit from dana at pro-built. need to make adjustments in there that work together, rather than trial and error it.
#4
Supreme Member
Re: Rebuilding my TH700R4. Newbie with some questions
Searching further on the internet I found that at times people rebuild these transmissions and remove the springs from the accumulators to put sleeves instead. Mine has sleeves also.
Apparently this will result in stiffer shifts at WOT.
Do you guys think I should put back the springs or leave the sleeves there?
Apparently this will result in stiffer shifts at WOT.
Do you guys think I should put back the springs or leave the sleeves there?
If your transmission is missing accumulator pistons, it has definitely been torn apart and modified in some fashion. Eliminating the accumulation is done to lessen the time it takes for the transmission to release a gear and apply the next (at all throttle openings, just not WOT)
It's pretty difficult to say one way or another if you should leave your transmission the way it is now (without accumulation) or to put the missing parts back in (I don't know if you can just put in the missing parts and not have to undo what other modifications might have been done related to the accumulation).
I tend to listen to the advice of an expert when it comes to something that I know only enough to be dangerous.
http://www.700r4l60e.com/forum/viewtopic.php?f=19&t=9
The few times when I've had to get into the internals of an automatic transmission, I only want to do it once; it's way to expensive to be buying hard parts and having to remove, correct a mistake and re-install it to make it common practice.
Why are you rebuilding the transmission if there's nothing wrong with it?
#5
Senior Member
Thread Starter
Re: Rebuilding my TH700R4. Newbie with some questions
To clarify its missing the springs not the pistons. It has sleeves instead of springs.
Why rebuild? good question : 3 reasons :
1. I am interested and want to learn on auto transmissions
2. I wanted to solve leaks from pump, sump, front and rear shafts
3. I don't know what the car went through so it gives me the opportunity to investigate the past.
Why rebuild? good question : 3 reasons :
1. I am interested and want to learn on auto transmissions
2. I wanted to solve leaks from pump, sump, front and rear shafts
3. I don't know what the car went through so it gives me the opportunity to investigate the past.
#7
Senior Member
Thread Starter
Re: Rebuilding my TH700R4. Newbie with some questions
I wish it was this easy for me. Don't think he will be interested in calling Malta...
And anyway I am not planning on anything special. Maybe replace clutch plates if they are worn out. Seals for sure.will probably leave the accumulators without springs.
Bushes don't seem to require any replacement but if I change the clutch plates I will get a kit including bushes and change them.
And anyway I am not planning on anything special. Maybe replace clutch plates if they are worn out. Seals for sure.will probably leave the accumulators without springs.
Bushes don't seem to require any replacement but if I change the clutch plates I will get a kit including bushes and change them.