adding gears to a th400?
Thread Starter
Racer
Joined: Jun 2005
Posts: 446
Likes: 0
From: Memphis,TN
adding gears to a th400? Ive been told you can add up to 2 gears to a th400. I know you can add 1 extra gear for an OD. But is it possible to add 2 and have a 5 speed auto th400? That sounds like a dream to me.
Launching!
Joined: Feb 2004
Posts: 228
Likes: 2
From: Lakeland, Fl.
Gear Vendors cuts all your gears in half, so you would actually have 6 gears. Goto their website. There was a guy here that had it in like a 70 Nova, it was badass, but I think it north of $2000. Hope that helps. Tim.
Thread Starter
Racer
Joined: Jun 2005
Posts: 446
Likes: 0
From: Memphis,TN
Are you serious! You can make a 6 speed auto out of a th400! Thats awesome. Why cant it be done to the 4l60e? Everybodies been telling me to dump the 4l60e if i wanna make 900hp. Thats what i want at the flywheel and 800hp at the wheels. Can the 4l60e not be built to take this pressure?
At that power level, don't waste your time with a 4L60. Unless you like banging your head against the wall. From what I have heard, the GVOD does not work well in a drag race type of situation. Something about the shifts not being very consistant. Could make it nicer on the highway.
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TECH Resident
Joined: Dec 2004
Posts: 841
Likes: 0
From: Baltimore, MD.
Probably about the power you're making now, maybe a little more, maybe a little less.
The 60E isn't exactly known for being bulletproof. My personal take is that anything over about 450 hp is a crapshoot. And the more power, the worse the odds of it living. And more weight and traction also make the odds of blowing it up worse. Sadly, its more like playing roulette in Vegas than I think anybody would like.
You've got to define what your idea of "handling" is.....Are 1 or 2 rebuilds a year acceptable? Or does it have to be absolutely bulletproof for 3 years or 5 years or....
Once you figure out what your idea of "handling" looks like, then you can talk to a couple of good builders and they can give you a good idea of what kind of power it will stand up to, and how much that built tranny (and torque convertor) will cost.
Just my $.02
'Dreamin'
The 60E isn't exactly known for being bulletproof. My personal take is that anything over about 450 hp is a crapshoot. And the more power, the worse the odds of it living. And more weight and traction also make the odds of blowing it up worse. Sadly, its more like playing roulette in Vegas than I think anybody would like.
You've got to define what your idea of "handling" is.....Are 1 or 2 rebuilds a year acceptable? Or does it have to be absolutely bulletproof for 3 years or 5 years or....
Once you figure out what your idea of "handling" looks like, then you can talk to a couple of good builders and they can give you a good idea of what kind of power it will stand up to, and how much that built tranny (and torque convertor) will cost.
Just my $.02
'Dreamin'
Launching!
Joined: Feb 2004
Posts: 228
Likes: 2
From: Lakeland, Fl.
The GVOD says that it can handle 1200hp, now I dont know if your trans can hold that. And the cool thing about the GVOD is that you can just use that regular 3 gears in the TH350/400, then hit a switch and you have your 3 extras. Also, you can make a 8 speed auto out of the 4l60, if anyone cares. Tim.
Originally Posted by Sandmann120
At that power level, don't waste your time with a 4L60. Unless you like banging your head against the wall. From what I have heard, the GVOD does not work well in a drag race type of situation. Something about the shifts not being very consistant. Could make it nicer on the highway.
The GVOD is just another planetary gearset, just like an automatic transmission has. Whoever you heard that from is on crack. besides, how often are you going to drag race in overdrive 
Nate
