Will a 99 Flexplate work with a th400 swap?
03-15-2005, 02:17 AM
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I used my '99 flexplate on my th400 swap. I just had to use the second set of mounting holes.. if your flexplate has two sets of holes it should work.. see if the converter holes match up. I bought the GM 4L80E spacer and bolts so the th400 converter I had would seat correctly.
I didn't have to drill anything either. My converter did have two sets of holes drilled in the mounting tabs too.. I don't know if that helped at all.
Also the engine to trans bolts were too long or short or something so I had to buy a new set. I had a forward man. valvebody so I just re-used the stock shifter. I used a madman dipstick tube and a custom driveshaft and that's it.
I didn't have to drill anything either. My converter did have two sets of holes drilled in the mounting tabs too.. I don't know if that helped at all.
Also the engine to trans bolts were too long or short or something so I had to buy a new set. I had a forward man. valvebody so I just re-used the stock shifter. I used a madman dipstick tube and a custom driveshaft and that's it.
Last edited by aram; 03-15-2005 at 02:26 AM.
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10-09-2008, 07:38 AM
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From one of the stickies
Converter-
Can I use a standard th400 converter? Yes but certain conditions exist..The converters typically used are standard SBC converters that have two minor modifications. The first is that they use a LS1 Pilot diameter. The second is that they should have the pilot extended 3/8" to make up for the difference in length between the LS1 and a traditional SBC. If you want to run a "standard" TH400 converter, and the TCI flexplate, the TCI spacer can be replaced with one with a longer nose. This is because a standard converter doesn't have a pilot long enough to engage the back of the crank.
With the use of a stock flexplate and standard converter, you will need some special spacers.
I highly recommend to just buy a TC from a company such as Yank, Fuddle, Vig., etc.. and tell them you are putting a Th400 in your car. The TC will then come with the proper pilot and bolt pattern. The use of spacers is to much of a hassle in my eyes.
Converter-
Can I use a standard th400 converter? Yes but certain conditions exist..The converters typically used are standard SBC converters that have two minor modifications. The first is that they use a LS1 Pilot diameter. The second is that they should have the pilot extended 3/8" to make up for the difference in length between the LS1 and a traditional SBC. If you want to run a "standard" TH400 converter, and the TCI flexplate, the TCI spacer can be replaced with one with a longer nose. This is because a standard converter doesn't have a pilot long enough to engage the back of the crank.
With the use of a stock flexplate and standard converter, you will need some special spacers.
I highly recommend to just buy a TC from a company such as Yank, Fuddle, Vig., etc.. and tell them you are putting a Th400 in your car. The TC will then come with the proper pilot and bolt pattern. The use of spacers is to much of a hassle in my eyes.
10-09-2008, 10:01 AM
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Ok, I read the stickie - says they highly recommend getting a new converter specifically for a TH400 and an LS1 but that you can use spacers also. Are these spacers similar to big washers? Do transmission companies sell them? I have a 98 flexplate, a TH400, and a 3200 stall converter (sbc).
10-09-2008, 10:44 AM
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Ah found something: https://ls1tech.com/forums/showthrea...t=spacer+th400
I'm pretty sure that Hughes spacer will work with my 98 flexplate and sbc torque converter.
I'm pretty sure that Hughes spacer will work with my 98 flexplate and sbc torque converter.
