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700R4 or 2004R??
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mnunn
Master Wrench
Master Wrench


Necoa #: 5673
Location: 2(CT,MA,ME,NH,RI,VT)
Joined: Jun 26, 2005
Posts: 850
Year: 1970
Model: El Camino

PostPosted: Fri Jul 04, 2008 7:11 am    Post subject: Re: 700R4 or 2004R?? Reply with quote

Reread your post and realized I didn't answer one of your questions.

elcamino74guy wrote:
I've been reading about the two GM OD transmission offerings that work best with our rides and now I'm a bit confused. ...
I always heard that the 2004R was the weaker of the two trannys yet they put it behind the Buick Grand National.


While the TH700 is stronger and has a better low gear ratio, the 1-2 shift brings with it a fairly large RPM drop going into 2nd (3.06 to 1.8 something if memory serves). With a TH700, the GN's V6 turbo boost would probably fall flat going into 2nd with this tranny. With the TH200's shorter jump there's much less of an RPM drop going into 2nd, maintaining boost pressure when it's needed most.
_________________
70 Elky (Non-SS) 454CID, TH700-R4
69 Chev C-10 Pickup (recently Upgraded to 454) w/TH400
29 Model A (Recently Sold).
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b.dock87
Spanner
Spanner


Necoa #: 11894
Location: 18(N.CA,N.NV)
Joined: Jun 10, 2008
Posts: 8
Year: 1987
Model: El Camino

PostPosted: Fri Jul 04, 2008 11:05 pm    Post subject: Reply with quote

i had a th200-r4 in my elky it blew out so i had it rebuilt by a great gear shop and put in a valve body kit


best thing ive done for my ride so far
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