th400 with od?
th400 with od? hey all, i read a post a few days ago about a th400 and someone said it's possible to buy a th400 with an od. what website is this on and is it possible to get a regular th400 and put an od in it?
Re: th400 with od? ok well first, Lafngas98z is totally wrong. the 4L80e is NOT NOT NOT a TH-400 with an overdrive. i dont know where he got that from. 4l80e is the truck tranny GM has been putting in the suvs and light duty (non-industrial) trucks. it is similar to our 4L60e, just weighs a ton and is a true overdriven tranny (a final gearing of less than 1/1 ratio).
there is a unit that adds overdrive to your existing TH-350/400 but it is big bucks. around 2500 bucks i believe for the addon unit + about 2-3K for the built th-400 from a number of vendors here. Yank has built a Lock up style th-400 for corvettes but no work on f-bodies yet. lock up style has a lot more to do with the convertor than anything. it still wont have a sub 1/1 final gear or overdrive, just helps with a convertor that will lock up in the final gearing to lower the rpms on the highways.
search and you will see this topic talked a bunch. cant really have your cake and eat it too. strength or overdrive. to have both would cost you a ton (5500 bucks easily).
there is a unit that adds overdrive to your existing TH-350/400 but it is big bucks. around 2500 bucks i believe for the addon unit + about 2-3K for the built th-400 from a number of vendors here. Yank has built a Lock up style th-400 for corvettes but no work on f-bodies yet. lock up style has a lot more to do with the convertor than anything. it still wont have a sub 1/1 final gear or overdrive, just helps with a convertor that will lock up in the final gearing to lower the rpms on the highways.
search and you will see this topic talked a bunch. cant really have your cake and eat it too. strength or overdrive. to have both would cost you a ton (5500 bucks easily).
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Re: th400 with od? Well, the 4L80-E is Nothing like a 4L60-E;
The 4L80-E internally looks Exactly like a THM400 with overdrive and electronics added.
It even looks [almost] the same externally.
Both the 4L80-E and THM400 were for "heavy duty" applications and can handle more torque than any of: THM350, 200-4R, 700-R4, 4L60, 4L60-E, [and maybe] 4L65-E.
Like the THM400, the 4L80-E is better suited behind big blocks since it has more parasitic drag and big blocks usually have more torque than anyone knows what to do with.
There also is the 4L85-E which is stronger still than the 4L80-E.
The 4L80-E internally looks Exactly like a THM400 with overdrive and electronics added.
It even looks [almost] the same externally.
Both the 4L80-E and THM400 were for "heavy duty" applications and can handle more torque than any of: THM350, 200-4R, 700-R4, 4L60, 4L60-E, [and maybe] 4L65-E.
Like the THM400, the 4L80-E is better suited behind big blocks since it has more parasitic drag and big blocks usually have more torque than anyone knows what to do with.
There also is the 4L85-E which is stronger still than the 4L80-E.
TECH Enthusiast
Joined: Nov 2001
Posts: 524
Likes: 0
From: Galveston, Tx.
Re: th400 with od? Just to add to the confusion I was told that a trans brake would not live behind a overdrive tranny, even the gear vendors equipped TH350/400.
Dont know if this is true, but the TH350 w/ transbrake rocks...
Dont know if this is true, but the TH350 w/ transbrake rocks...
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Re: th400 with od? We will find out if that is true or not pretty soon. I have a TH400 with GV overdrive and my car is almost back together...3500rpm trans brake launches @ 10psi are in my very near future.
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Re: th400 with od? Not sure if it will work on a c5 vette. The GV unit itself is ~2300. The install kit that comes with it is very very complete though, it even came with the sensor for the speedo.
Scott
Scott
