Converter snout too big?
03-19-2010, 12:45 AM
#1
On The Tree
Thread Starter
Converter snout too big? I have a TH-350 transmission that I bought a aftermarket stall converter. I can not get the aftermarket converter engage or even clear the front pump cover. Its almost like the snout on the converter is too thick. I already sent it back to have it fixed and it still wont clear. I can get the stock one and my friends aftermarket converter to engage with no problem.
Any ideas or tips?
Any ideas or tips?
03-19-2010, 06:18 AM
#2
Not entirely sure what you are asking. But here are some dimensions for a 350 converter.
Hub = 1.875 - the part that goes into the trans pump
Pilot = 1.702 - the part that goes into the engine crank
OAH = 6.125-6.175 - over all height - from hub to mounting pad
If you have a spare pump gear you could check the hub to make sure it is round.
Hope this helps.
Chris
Hub = 1.875 - the part that goes into the trans pump
Pilot = 1.702 - the part that goes into the engine crank
OAH = 6.125-6.175 - over all height - from hub to mounting pad
If you have a spare pump gear you could check the hub to make sure it is round.
Hope this helps.
Chris
03-19-2010, 01:59 PM
#3
On The Tree
Thread Starter
Actually that will help a bit.
Im asking why does the stock converter and my friends aftermarket converter go onto my transmission perfect but when I try my aftermarket converter does it does not fit. It just sits on the front pump cover bushing/seal.
Im asking why does the stock converter and my friends aftermarket converter go onto my transmission perfect but when I try my aftermarket converter does it does not fit. It just sits on the front pump cover bushing/seal.
03-19-2010, 09:19 PM
#4
On The Tree
Thread Starter
Is it really bigger than the seal, or thats just where it stops?
It might just need some force since the new one has new parts that fit tighter.
Was a new pump bushing installed, sometimes they are tight too.
Are you sure you don't have a th350c?
Any pics?
The th350/400 pump hub is the biggest one used on the popular GM transmissions.
Is your pump aluminum or iron?
It might just need some force since the new one has new parts that fit tighter.
Was a new pump bushing installed, sometimes they are tight too.
Are you sure you don't have a th350c?
Any pics?
The th350/400 pump hub is the biggest one used on the popular GM transmissions.
Is your pump aluminum or iron?
I would take some pictures but I already sent the converter back to the manufacturer. Its not a cheap TCI converter either...
Id imagine its an iron pump
03-19-2010, 10:23 PM
#5
On The Tree
Thread Starter
The bushing was driven in crooked. Half way into my 45 minute test drive to work the bushing walked out and opened up the seal causing fluid loss and a small fire on the header.
Even if it hasn't I'd maybe suggest the converter butcher give you a free $3 bushing and $5 seal for your trouble.
This thread has me curious, who can't build a th350 converter these days?
Even if it hasn't I'd maybe suggest the converter butcher give you a free $3 bushing and $5 seal for your trouble.
This thread has me curious, who can't build a th350 converter these days?
Ill request that along with some other things since this is the 2nd time I've had to send it back.
Its a precision industries converter. I don't think they make a bad product i think its just my luck
03-20-2010, 01:07 AM
#6
Is it a converter from Neal Chance by chance? we had this happen and had to send one back 3 times before they finally got one that fit. the Notches on the converter were too small and would not engage, something about shirking during some process. IDK.
03-20-2010, 01:38 AM
#7
On The Tree
Thread Starter
^^^
It doesnt even fit through the pump cover hole where the input shaft comes out so i have no idea if the notches are the right size
It doesnt even fit through the pump cover hole where the input shaft comes out so i have no idea if the notches are the right size
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03-20-2010, 03:22 AM
#9
On The Tree
Thread Starter
03-20-2010, 10:25 AM
#10
Have you tried to stand the trans on the output shaft and try to install the converter? This in some cases will help.
The issue you might be having might not be the converter hub. A couple of things to consider.
How was the bushing installed? I always use a press to install these. If the bushing was installed using a bushing driver and a hammer, it might be mushroomed a bit on the edge. This will make the inner diameter of the bushing smaller than it would normally be. With the hub being new the tolerance might be on the tight side.
Also does your unit have an after market input shaft in it? I have found with a new converter and it's components, sometimes the splines might be on the tight side.
In order to properly diagnose this the pump and the input drum will need to be removed to check the converter hub and it's other components.
Do you have any pictures of the converter and the trans?
The issue you might be having might not be the converter hub. A couple of things to consider.
How was the bushing installed? I always use a press to install these. If the bushing was installed using a bushing driver and a hammer, it might be mushroomed a bit on the edge. This will make the inner diameter of the bushing smaller than it would normally be. With the hub being new the tolerance might be on the tight side.
Also does your unit have an after market input shaft in it? I have found with a new converter and it's components, sometimes the splines might be on the tight side.
In order to properly diagnose this the pump and the input drum will need to be removed to check the converter hub and it's other components.
Do you have any pictures of the converter and the trans?
03-20-2010, 01:27 PM
#11
On The Tree
Thread Starter
Have you tried to stand the trans on the output shaft and try to install the converter? This in some cases will help.
How was the bushing installed? I always use a press to install these. If the bushing was installed using a bushing driver and a hammer, it might be mushroomed a bit on the edge. This will make the inner diameter of the bushing smaller than it would normally be. With the hub being new the tolerance might be on the tight side.
Also does your unit have an after market input shaft in it? I have found with a new converter and it's components, sometimes the splines might be on the tight side.
In order to properly diagnose this the pump and the input drum will need to be removed to check the converter hub and it's other components.
Do you have any pictures of the converter and the trans?
How was the bushing installed? I always use a press to install these. If the bushing was installed using a bushing driver and a hammer, it might be mushroomed a bit on the edge. This will make the inner diameter of the bushing smaller than it would normally be. With the hub being new the tolerance might be on the tight side.
Also does your unit have an after market input shaft in it? I have found with a new converter and it's components, sometimes the splines might be on the tight side.
In order to properly diagnose this the pump and the input drum will need to be removed to check the converter hub and it's other components.
Do you have any pictures of the converter and the trans?
It was put on with a bushing driver and hammer
It has the factory input shaft on it.
I do not have any pictures of the converter. I already shipped it back for them to fix it...hopefully. I have the transmission in garage though.
I have seen/put 3 other converters onto my transmission. 1 factory and 2 aftermarket converters went on with no trouble at all
Thanks for all the replies.
03-26-2010, 10:33 PM
#13
On The Tree
Thread Starter
To let everyone know I talked to precision on Wednesday and they just told me they were just going to give me a whole new converter. They over-nighted it to me and it showed up today. It was such a relief to hear clunk-clunk-clunk. It fit perfect. Now to put the drive train in.
