700r4 vs th400

[BadAss_2002]

This is going behind a built 454. Which will hold up better for racing/playing in the mud? I\'m planning on running 3.42s or 3.73s. Any ideas what rpms I\'d be turning at 70-80 with both trannys? I also want a reverse pattern valve body with full manual control...Thanks

[Fergusonic]

RPMs: This site: go to FORUM REAR END

Calculations...first and last post.



400 will take more abuse.

[Knanthrup]

The 400 should be significantly stronger. especially with the torque of the 454 in front of it. Although, either could be built up by a good tranny shop...

[BadAss_2002]

LoL, it\'ll be done my self. Finding a good tranny shop here is like the odds of winning the lottery. No one wants to touch anything remotely related to racing http://www.s10v8.com/images/smilies/icon_mad.gif

[BadAss_2002]

Oh yea...forgot this part. Been to 3 diff shops. 1500+, 1600, and 1450 were the \"estimates\" That was rebuilding the 700R4 I have now. That didn\'t include labor for taking the tranny out, as it was going to be pulled out my self and dropped off. Seemed extremely high for a stock rebuild, with a vette servo...

[stenaholic]

either tranny will hold up if built correctly, but if you want to cruise at all the 700r4 would be more practical. I have seen some excellent trannies at www.transmissioncenter.net. they build 700r4\'s to take 600-700 h.p. and massive torque. they are reasonably phttp://www.s10v8.com/images/smilies/smileJap.gifd too. the th400 would be cheaper but may require extras like cross member and new driveshaft ect. my blazer runs 71 m.p.h. at 2000 rpm with the 4L60-E which is an electronically controlled version of the 700r4. my tires are 235/75/15\'s for now. i do get decent hiway milage also

[MOREPOWER]

i didn\'t have to get another cross member for the 400. just moved it back about inch and of course had the driveshaft redone, but not much work.

[Fergusonic]

The 400 is heavier than the 700R4.....but with a big block in there, looks like weight is not an issue! sounds sweet!

[RON]

GONE THRU 3 700R4S NOT AGAIN! LEAVE IT ALONE GO 400 STRONGER. I HAVE 350 NOW YOU NEED 400 FOR THE BIG BLOCK IF YOU ARE GOING TO ABUSE IT GO 400.

[BadAss_2002]

Yeah, I\'m not going for a 700R4. 4 times and it still broke...I\'m gonna get a TH400 for 560 with a 2800 stall. I\'m still looking for the motor but this weekend I\'m yanking the pos 2.8/700R4 combo and cleaning up/painting the frame and going through the suspension/steering components...