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73-87 Chevy _ GMC Trucks => Suburbans => Topic started by: overthepond on May 21, 2008, 04:22:36 pm

Title: 700r4 to th400 swap..(possible or not)
Post by: overthepond on May 21, 2008, 04:22:36 pm

Hey guys..!

I just picked up a 84'Suburban 2wd with the 350 and a fried 700r4.
I also have a known to be ok th400 in the shed that i want to use to replace the fried tranny.
What am i up against in the swap,basically any info on what will or wont fit,what i'll need and if its worth the hassle and trouble.
Many thanks in advance.. ;D

Title: Re: 700r4 to th400 swap..(possible or not)
Post by: zieg85 on May 21, 2008, 05:47:12 pm

Check the length of the transmissions and compare.  You may need a different/altered drive shaft.  TH400 use an electric kick down as far as I can remember.  Cross member will need to be moved but holes should be in the frame for the new position.  If it is a true TH400 the rear output is different and requires a different yoke.  They made a TH375 that looks just like a 400 but the rear output is the same as the TH350/700R4.  I am sure there are other considerations and others will chime in.