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torque converter ?

73redblaze

73redblaze

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i have a torque converter on the back of my 454 but i also have one attached to my trany. does it matter what one i use? they were both th400 but one is for a np203 and one is for a np208. does it matter?
 
More than likely internally different (stall speed), but as long as the flex plate pattern is the same, they are going to fit. Stall rating for stock converters are usually very close, except probably the diesel ones.

Are either of these used/unknown condition? It's really not recommended to re-use a torque converter if there is the possibility that anything got into it, whether it be dirt, water, or parts from the last transmission. Particles can take out the "new" transmission in short order.
 
there both in used condition. il just use the one thats already on there because im going to have to pull the trany off while its still under the truck so it would just be another pain to swap converters.
 
73redblaze said:
there both in used condition. il just use the one thats already on there because im going to have to pull the trany off while its still under the truck so it would just be another pain to swap converters.
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You arent leaving the converter on the flywheel and shoving it in that way are you??? If you are thinking about that STOP!! you have to put the converter on the input shaft of the tranny and spin it 5 or 6 revolutions to get it all the way slid in..............................
 
You arent leaving the converter on the flywheel and shoving it in that way are you???
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um.... um.... yea i was. but then how do you bolt the torque converter to the flywheel? becuase the motor is in the truck so i have to go under there and pull off the trany (which is going to be a pain in the a$$ anyway)? do i have to take the motor out?
 
even if i did take the motor out how do you bolt the torque converter on to the flywheel
 
You take the flywheel cover ( it's on the tranny ) off to get at the torque converter bolts. It could be sheetmetal or it could be aluminum. Turn the motor around with a flywheel tool or by hand with the harmonic balancer after you take the spark plugs out.
Tarey
 
You take the flywheel cover off to get at the torque converter bolts. It could be sheetmetal or it could be aluminum. Turn the motor around with a flywheel tool or by hand with the harmonic balancer after you take the spark plugs out.
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what? i have no idea what your saying.. and why do i have to take the sparkplugs out?
 
There is an aluminum (if it's a true 4WD trans) inspection cover that is held on with six bolts and allows access to the torque convertor bolts. If the trans is a 2WD case then the cover will be stamped sheet metal and held on with four screws. If you were to try and leave the convertor attached to the engine and then install the engine you WILL ruin the trans pump.
 
i understand everything but this part
Turn the motor around with a flywheel tool or by hand with the harmonic balancer after you take the spark plugs out.
Tarey
Click to expand...
 
73redblaze said:
i understand everything but this part
Click to expand...

This is the tool for turning the engine over so you can access each of the three bolt holes to bolt the convertor to the flexplate.


55580530.jpg


Assuming you don't have this tool you can turn the engine over with a 5/8" socket on the front crank pulley bolt.
 
oh ok i completly understand. is there any tricks to getting the trany bolts off that connects it to the back of the engine of just squeeze a wrench in there? so this is how i understand it, push the torque converter thats already attached to the trany into position, then put the 4 (or so) torque converter bolts on by turning the front crank bolt. then im good to go? thanks guys
 
You should be able to use a socket on those bolts. You just rotate the flexplate to get one bolt at the bottom and remove them one at a time.

If the torque converter has been on the transmission all the time, then it is probably fine to use. If it has been sitting around by itself you should at least get it flushed out at a transmission shop before putting it on.

What these guys are saying is that the converter should be installed on the transmission first. Then the transmission should be installed into the vehicle. Once the tranny is bolted to the engine you bolt the torque converter to the flexplate. Of course removing the transmission is just the opposite. The tranny + torque converter comes out as one unit.
 
ok sweet. i didnt know the torque converter was threaded onto the trany becuase i have always just pulled the trany off and the shaft slides right out of the converter and the converter stays on the motor. i had no idea it was threaded. thanks
 
its not threaded, they slide on and to line up the slots, it usually takes a couple rotations of the convertor while pushing in to get it to fully seat on the front pump. You should have about 1.25 inches of space between end of the convertor and the end of the bell housing. If not, its not on all the way and when you go to install the tranny, youll notice that the bellhousing wont line up flush to the engine because the Torque convertor is in the way and needs to be pushed on even more, doing this can cause damage to the front pump on the tranny so make sure its seated properly first.
 
ok sweet. the torque converter came off with the trany so it should be right. im gonna try to get it done today. thanks
 
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