i am swapping my 2004-r for a TH400 (4in tailshaft) on my 85 Monte ss. I have read in your tech articles that a 2004-r length driveshft will work unaltered, but other are telling me that it must be shortened 1/2-3/4 inch. What is the correct answer, and how will I know before messing anything up on the new trans? This is my daily driver, so if needed, I can get a std. length 2004-r driveshaft and have it shortened and ready to install. Any help or experience you may have would be a great help.
2004-r to TH400
- Thread starter 85streetss
- Start date
85streetss said:
The stock Driveshaft will need a 32 Spline TH400 Yoke, 2004R's is 27 Spl.
There're conflicting measurements on both of these Trans. As seen here.
http://www.maliburacing.com/auto_tranny_id.htm
http://www.tciauto.com/Products/TechInfo/trans_dims.asp
I'd measure both myself. You may be able to find the correct length 400 Yoke & not have to cut the D-shaft.
I just did this swap. Just had to change yoke. The rubber trans mount is different so you have to buy another from the parts store. The transmission lines work after a tiny bit of bending.
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