thrustnut Posted September 22, 2008 Share Posted September 22, 2008 Hey all, not really a newbie here, I have had my 77 280Z for over ten years, but have recently decided to do the Gen1 Chevy V8 swap. My question is for all you out there that already have this swap, which tranny do you prefer, the TH350 or 400? I plan to build around 350HP at the crank, and would like to keep the RPM’s out of the critical range as much as possible. It will be used for cruzing most of the time, and im afraid a TH350 will really wind out on the highway. I also wanted to know if a TH400 will work with the JTR cross member. Thanks!!! Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted September 22, 2008 Share Posted September 22, 2008 Personally for that HP I would opt for the th350, lighter, and will handle that HP fine. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted September 22, 2008 Share Posted September 22, 2008 the th350 should be fine, the th400 is a far better choice once the torque levels exceed about 430 ft lbs, as its significantly stronger internally but at 350 hp the lighter th350 makes more sence http://www.tciauto.com/Products/TechInfo/trans_dims.asp http://www.tciauto.com/Products/TechInfo/gear_ratios.asp Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted September 22, 2008 Share Posted September 22, 2008 If that's all the horsepower you're gonna run, then I'd get a 700R4 overdrive. That will keep the revs low on the highway. (Or a 4L60E is you have a computer for it) Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted September 22, 2008 Share Posted September 22, 2008 TH350 is 125 lbs, TH400 is 134 lbs. About 10 lbs difference. Quote Link to comment Share on other sites More sharing options...
thrustnut Posted September 23, 2008 Author Share Posted September 23, 2008 WOW grumpy, i dont know where you got all that info, but that pretty much answers my question! Thanks all!! Quote Link to comment Share on other sites More sharing options...
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