LT1-LT4 Modifications 1993-97 Gen II Small Block V8

TH-350 or 400 conversion

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Old Dec 21, 2006 | 09:39 PM
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Default TH-350 or 400 conversion

Just wondering what it takes to do either of these I can get th-350's farly cheap from friends and with my new build be done and my a4 already slipping on the
3-2 down shift at WOT i don't think it will last to long after my build.
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Old Dec 21, 2006 | 11:08 PM
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th400 will take more abuse but is also less efficient. if you arent making tons of power i would run the th350.
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Old Dec 21, 2006 | 11:32 PM
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thats what i was thinking of going with but dont really know what I would need how to set-up the shift linkage and speedo also the TC and flywheel and would i still be able to run a locking converter. lol i tried a search but didn't really find anything usefull
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Old Dec 22, 2006 | 12:15 AM
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you will need a new crossmember, driveshaft, and all the little things to make the speedo work. i dont think you could get a lock-up comverter and as far as flywheel you could use the same a standard flywheel like what you have buut preferably something that is sfi approved of course.
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Old Dec 22, 2006 | 12:19 AM
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hmm well i guess i will just have to build my 4l60e I really want a lock-up do to it will be a weekend car but still driven. I am not the type to just take it to the track or just take it out on the street for an hour oh well thx for the help tho.
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Old Dec 23, 2006 | 11:26 AM
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I believe you can use your stock driveshaft if you get a turbo 350 with the longer tailshaft, i cant remember the exact length but it is identical to the 4l60e.
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Old Dec 23, 2006 | 12:52 PM
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The 4L60E is VERY capable IF and only IF built by a select few shops around the country. It gets a bad reputation because most shops can't do it but claim they can and when it fails they blame the tranny.

ProBuilt Automatics, FLT, Rossler are the first three that come to mind but are by no means a complete list and a few of those guys have customers with 9 second cars running 4L60Es one of those is a 4400lbs Impala running 9.6 at 146mph. Point being don't listen to anyone who says this tranny can't take it, they just used the wrong shop.
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Old Dec 23, 2006 | 01:22 PM
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ya i figured it would be able to be built i just thought if i could get a th-350 for basicly free then i would swap but that was only if the TC was locking. I have some places in mind. right now the only problem I have with it is on the 3-2 downship at high speed like say i am doing 70 on the HW and go WOT it jumps RPM before it starts to move so probably slipping.
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Old Dec 23, 2006 | 02:06 PM
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Drop the pan change the filter and consider getting a valvebody gasket kit so you can clean the two screens in the seperator plate. On a bad build I had before the ProBuilt I had the screen on the pressure rise solenoid(proper name escapes me at the moment) get plugged and stop pressure rise at all times. Really though if there is enough clutch debris to be plugging screens it aint long for the world anyway though.
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