Th400
October 20th, 2011, 6:21 PM
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Join Date: Apr 2010
Location: Ft. Worth
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Yep, I read the manual today, the TH400 doesnt have a TV lever but it has an electric downshift detent switch(the kick down)-forces a downshift on full throttle. I dont know how you would wire that or how that get powered. There has to be some ground switch connected to the butterfly or something. What gets me is the 700R4 and how the intermediate band applies during 2 and 4th Gear. Odd. 700 is the same as the 400 but with an OD gear.
When I said steel center support I meant inside the case where the direct drive clutch sits. Thats why you can do things to a TH400 you could NEVER do to a TF727. This is good ol' American engineering where the TH400 was stock in everything from the Cadillac to the Kodiak to the Rolls Royce. Short tailshaft was for high cubed motor with short wheelbase(Vettes and Jags XJ12s, Ferrari 400s), likewise for long tailshaft.
But tell me, could you fabricate a steel input shaft for the 4R100s. I hear that is the sole reason they dont perform well in high torque apps. Actually I heard that about the AOD but its as question worth asking.
When I said steel center support I meant inside the case where the direct drive clutch sits. Thats why you can do things to a TH400 you could NEVER do to a TF727. This is good ol' American engineering where the TH400 was stock in everything from the Cadillac to the Kodiak to the Rolls Royce. Short tailshaft was for high cubed motor with short wheelbase(Vettes and Jags XJ12s, Ferrari 400s), likewise for long tailshaft.
But tell me, could you fabricate a steel input shaft for the 4R100s. I hear that is the sole reason they dont perform well in high torque apps. Actually I heard that about the AOD but its as question worth asking.
I'm not worried about building the 4r100 up to hold the power I'll be making (550ish to the rear wheels), It's pretty normal for a built 4r100 to hold 600-700rwhp, it's the weight that I don't want. A th400 is 100lb lighter than a 4r100 (total weight of truck with full interior 5,500ish lbs). I've even thought about building up a 4r70 and retain OD
Since my last update, I've started rebuilding the 4r100 with a jlp stgIII kit, and running a '76 divorced np205 transfercase.
A th400 is not out of the question though, planning on throwing it together to get measurements to figure out which tail shft th400 to get. short or long
Teaser shot
haha, later guysI LOVE HP!!!
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