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TH 350 install- When to attach converter?

9.3K views 9 replies 6 participants last post by  streetrodderbn  
#1 ·
This is a total newbie question, but I have always done manual trannys.

I an getting ready to put the engine and trans into my 35 Chevy Master. I have the complete engine and trans ready to mate together.
My question is:
Should I bolt the torque converter to the flexplate and then put the tranny on, or should I slide the torque converter into the tranny and then bolt it to the flexplate?
Does it really matter?
Thanks

Mark

Also, are there any good references as to how to intall a shifter, kick down, etc? I could probably figure it out, I just like to be informed.
 
#3 ·
The converter MUST be inserted into the tranny first. It should go it like 3 notches. Spin and apply light presure until it is seated. It is very easy but can be catastrophic if done improperly. There should be 1/4 to 3/8 between the converter and the flex plate after the transmission is installed and the converter should spin freely. You also may want ot pour a qt of fluid in the converter before you install it onto the transmission. Also do yourself a favor and change the front seal on the tranny while it is out and put a little lube on it and be carefull not to damage it while inserting the converter.
 
#4 ·
marks914 said:
Also, are there any good references as to how to intall a shifter, kick down, etc? I could probably figure it out, I just like to be informed.
What model transmission is it. On some it is crucial that the cable be adjusted properly or you will burn the transmission out in short order. There are threads on this site and many others relating to this. If it is a th350 them it is not critical, I believe the th400 and any of the 4 speeds need to be properly set or you will have big problems
 
#5 · (Edited)
Thanks for the input,
I really appreciate it. I will definately take the advice on the trans seal as well, might as well while Im in there...

Just be sure, slide the converter on the trans 3 clicks, spin it (any direction? what does this do?)
Install trans then when I install the bolts they will pull the converter up to the flex plate right?

Mark
 
#6 ·
marks914 said:
Thanks for the input,
I really appreciate it. I will definately take the advice on the trans seal as well, might as well while Im in there...

Just be sure, slide the converter on the trans 3 clicks, spin it (any direction? what does this do?)
Install trans then when I install the bolts they will pull the converter up to the flex plate right?

Mark
Not sure how many clicks. I think it is 3 but you cant go by that. If it happend to be lined up with the first engagment right away it will only be 2. Just install it, spin it slowly with one hand while applying very light presure on the front until it is seated. It is real important it is on all the way.
Yes the converter bolts should be long enough to catch and pull it in but if everthing is ok you should just be able to slide it right up to the flexplate by hand after the tranny is installed and bolted up
 
#7 ·
If your skronny like me and you don't pinch your fingers you have a problem. Thats pretty much all there is to it. Set the converter in, add slight pressure and spin a half turn back and forth. Before you do this you will notice the little notch on the shaft of the convertor. Thats the last part to actually engage. It's what you will feel slip past when everything is seated properly.

All in all the last check should be done when ready to attach motor to tranny. There should be a slight gap between the flexplate and transmission. The gab will vary by convertor simply from the rebuild process. The gap on mine was just over a half an inch.

The reason for the gabs being different is because when a converter is rebuilt they have to cut it in half. This cutting takes away a thin layer of metal and increases the gap.
 
#8 ·
Be sure to pour at least one quart of ATF into the converter before sliding onto the input shaft of the tranny. This will lubricate the inner workings of the converter on first start until the tranny pump primes and fills the converter. Also pre-lube all of the mating surfaces by dipping your finger in some ATF and running it around the seals and input shaft.
 
#10 ·
Good advice guys! as for the kickdown cable adjustment, the thm350 has a simple adjustment procedure, with the cable attached to the right bracket for your application(lokar makes a great stainless bracket that uses the drivers rear intake bolts) and the cable attached to the correct type of carb stud(edelbrock makes a few good versions) take a flat bladed screwdriver and pull out on the adjustment clip, it's just behind the spring on the cable-towards the tranny. then have a helper step the accelerator pedal to the floor(engine off!!) and look at the carb.to make sure that it fully opens, if it fully opens when the throttle is pressed to the floor,simply push the adjustment clip down! you're done!! If the carb butterflies do not fully open when the throttle is depressed adjust the throttle cable first then the kickdown cable. make sure that all linkages and cables cannot bind the functioning of the carb too!! :pimp: