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    Th200 to TH350 swap

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    HeavyChevy77
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    Th200 to TH350 swap

    Post  HeavyChevy77 on Sun Mar 22, 2015 12:43 pm

    So my th200 feels like its on its way out. Starting to feel a little slipping when im getting on it, this whole time i thought i had a th350 and got the pan to change the fluid, but checking the pan to some pics on the net i find out its the th200 which people say (including my school transmission teacher) are piece of s#!+ but ive been pushing this trans hard(seems theres a mustang/charger/challenger wanting to get took on every corner) for a while now and is still solid.
    i was gonna do a 2004-r swap but i gotta cut the drive shaft so i was thinking the th350
    those are fairly cheap and hear its direct swap just need a detent cable, torque coverter,maybe a bracket for the carb. Will my flywheel be ok? 
    I hoping someone post with their swap experiances
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    Myloth
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    Re: Th200 to TH350 swap

    Post  Myloth on Mon Mar 23, 2015 3:45 pm

    You heard right the thm200 is low duty trans that is disposable.  The 2004r does require a flexplate from  say a

    80s MonteCarlo anything that came with the 2004r should be under 50 from a yard for that flexpate. The

    only real challenge is you have to move the transmission mount location one way or another with some swap like

    a th350 to 2004r in your case you might be ok as they are based on the same design GM just beefed up the

    2004r when they made it .(probably added the intermediate clutch pack they took out of the thm200 lol)
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    HeavyChevy77
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    Re: Th200 to TH350 swap

    Post  HeavyChevy77 on Mon Mar 23, 2015 5:35 pm

    i wanted the 4 speed but if i can get a th350 cheap for piece of mind it wont break on me.
    But i have the thm200 and want to put a th350
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    Sweet Seventy9
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    Re: Th200 to TH350 swap

    Post  Sweet Seventy9 on Mon Mar 23, 2015 6:05 pm

    Unfortunately, nothing from the th200 can be used. You need the th350 complete with the torque converter, kick down cable, etc.
    The flex plate will be re-used though.
    It's a straight in swap except for possibly moving the crossmember to accommodate the mount for the th350.
    I don't think any alterations to the driveshaft will be required.


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    Re: Th200 to TH350 swap

    Post  HeavyChevy77 on Mon Mar 23, 2015 6:21 pm

    thanx bro 
    ive beeb meaning to do a trans service on it i had bought a filter and pan (for the th350 tho) should i just buy the filter and gasket clean the pan and do it or should i not waste good atf lol..
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    Sweet Seventy9
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    Re: Th200 to TH350 swap

    Post  Sweet Seventy9 on Mon Mar 23, 2015 6:30 pm

    Well, it never hurts to change the fluid and filter.

    When you're all set to do the swap, you should retire the th200 in a blaze of glory!  I know they'll withstand a 305 with a 150 shot of nitrous.  I wonder what a 5000 rpm neutral drop would do to one, lol?

















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    Re: Th200 to TH350 swap

    Post  HeavyChevy77 on Mon Mar 23, 2015 7:01 pm

    Aw man u had me goin ..pondering of possiblities hah but the work that trans has put in, pissing/surprising people off the line  and leaving em behind, it will retire with a chip on its 
    shoulder but maybe some somkey burnouts/donuts will do..Oh what if i try that 180 reverse manuver where u punch it in reverse and whip the steering wheel to spin 180 and put that bi+*# in drive and smash the pedal lol..now if i can just find a spot
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    Re: Th200 to TH350 swap

    Post  Sweet Seventy9 on Mon Mar 23, 2015 7:14 pm

    Walmart parking lot? Very Happy


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    Re: Th200 to TH350 swap

    Post  solo79 on Mon Mar 23, 2015 7:28 pm

    I seem to recall my first Caprice had the TH200 and went out 2 weeks after I bought the car. We salvaged my Father's short tail TH350 out of his rusted out 72 GMC Sprint and it bolted right in the Caprice with zero modification. I remember having them side by side on the concrete drive as we pondered if it would work or not. We stuck it up in there and bolted all up and I sold that car 10 years later transmission still working. I don't remember doing anything with the cross member. As Sweet already mentioned, nothing from the 200 was reused, well except the 9/16" housing mounting bolts. I did reuse my same flywheel. The TH350 is not good for interstate speeds if you have low gears as my 82 Trans Am does and cranks 2500 RPM at 60 mph. You'll cook the engine at 70+. I don't recall what gears my first Caprice had, but it would cruise at 70 at a nice RPM and didn't sound like it was screaming.


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    Re: Th200 to TH350 swap

    Post  HeavyChevy77 on Mon Mar 23, 2015 8:16 pm

    *sweet if only the didnt have all those lamp posts ..lol 
    thanks solo79 
    i have the 2.56 gears (i think) but have the impala rear waiting to swap (wondering if i need to cut the shaft for the axle swap but the axles are the same depth from u joint strap to diff cover flange and the same LowerTrailingArm length) the axle has 3.08 gears
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    Re: Th200 to TH350 swap

    Post  Myloth on Sat Mar 28, 2015 12:15 pm

    Just remember unless you add a line pressure override that TV cable's setting is crucial as on the 2004r it controls

    line pressure for the transmission. There are several videos and write ups on the internet about it. The override if

    you want to modify the valve body it's cheap otherwise a valve body with fixed pressure is something like this.


    http://www.jakesperformance.com/200-4R_Components.html

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    200 to 350 trans.

    Post  terry cronk on Thu Nov 19, 2015 8:18 pm

    A 350 trans will go right in for the 200 replacement.

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