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View Full Version : 200R4 Conversion- Crossmember



barno68
01-18-2006, 08:38 AM
200R4 mount is further forward than the TH350- how close are they to a TH400? Would the TH400 crossmember work? I have seen aftermarket crossmembers that say they will fit both 200r4 and TH400, so in my never ending quest to say a buck...

jakespeeds
01-18-2006, 10:22 AM
On my 73 Nova I used a Th400 crossmember from a 70 big block Camaro and used the frame holes one set back from the TH350 holes. The mounting pad ended up almost right under the TH200 mount.

barno68
01-18-2006, 01:10 PM
I will have to look at the subframe, I did not realize there were additional mounting holes. That would be handy!

CAMAROBOY69
01-18-2006, 01:16 PM
I did the swap from the 200r4 to the TH350 for a friend about 2 years ago. I just moved the crossmember forward, re-drilled holes, and I made all the brackets for his shifter linkage. He already had the tranny so the swap was free. I am all about saving myself and others money. :)
However he hates it now because he has 3:73 gears still in the rear and now the TH350 tranny.
Ironic, I was just talking about this in another thread.

barno68
01-18-2006, 02:35 PM
Adam, it must be a "great minds" thing :-) That is funny, I am going the opposite route 2.73 to 3.42 otherwise I would have to upgrade to a stroker to push freeway speeds!

jumpmaster
01-18-2006, 11:37 PM
Adam...PM.

CAMAROBOY69
01-19-2006, 04:16 AM
Adam, it must be a "great minds" thing :-) That is funny, I am going the opposite route 2.73 to 3.42 otherwise I would have to upgrade to a stroker to push freeway speeds!
3.42 will be a good rear end for your set up with the TH350. Thats if your rear tire is around 26" in diameter. 26" is the average that everyone is running.