Questioning the trans.
Thread Starter
Teching In
Joined: Dec 2016
Posts: 7
Likes: 0
Questioning the trans. Im about to be putting a 6.0 out of a 2000 silverado in my mustang and was debating on a transmission. i was originally going to go with a 4l80e just cause its drop in and go and I've been seeing people put a lot of power through them. But my dad whom has always been around race cars has talked to me about a th400. now we did have a 79 Malibu with a bbc and a th400 and it was a good car trans held up perfectly fine. but i need some opinions and some help if you guys wouldn't mind.
-which one is the best to go with.
-also i am on a budget and will be using a holley dominator setup for ecu.
-which one is the best to go with.
-also i am on a budget and will be using a holley dominator setup for ecu.
TECH Junkie
Joined: Dec 2012
Posts: 3,618
Likes: 1,328
From: Iowa
4l80e is essientially a th400 with overdrive. Many of the internal parts can be swapped between the two. It is a very sturdy trans and if you do any street driving you will appreciate the overdrive.
A benefit of the 80e is that there are programmable shift points. You don't have to run some fancy shifter setup, or worry about slapping the ratchet shifter every time you race. Just put it in D3, adjust your shift points accordingly, and let her eat. Consistent and repeatable.
For all out race, making gobs of power, a 400 is probably going to be cheaper, and they are known to eat less power than the 80e. Best thing I can say, no matter which trans you go with, is get a converter spec'd for your setup. You can buy an off the shelf "4000 stall" but getting one spec'd is going to be better in every way for your setup.
A benefit of the 80e is that there are programmable shift points. You don't have to run some fancy shifter setup, or worry about slapping the ratchet shifter every time you race. Just put it in D3, adjust your shift points accordingly, and let her eat. Consistent and repeatable.
For all out race, making gobs of power, a 400 is probably going to be cheaper, and they are known to eat less power than the 80e. Best thing I can say, no matter which trans you go with, is get a converter spec'd for your setup. You can buy an off the shelf "4000 stall" but getting one spec'd is going to be better in every way for your setup.
TECH Fanatic
Joined: Mar 2014
Posts: 1,266
Likes: 165
Listen to your Dad. He will never steer you wrong. TH400 FTW. If you end up going big power you will definitely wished you had. An 80 will cost a lot more to build, to handle any real HP. And still won't hang like a TH400.
Thread Starter
Teching In
Joined: Dec 2016
Posts: 7
Likes: 0
th400+6.0 alright so i finally got a motor and it being a 1999 gmc 2500 hd 6.0
do i need to adapt the flex plate to put a th400 trans on or will the stock flex-plate work. i didn't search for very long but i found a few post on a quick google search that said some of the older gm 6.0s have no need to adapt them because of a longer crank. and others said different. but i dont know. do i need to buy a different flexpalate or just use the stock flexplate.
do i need to adapt the flex plate to put a th400 trans on or will the stock flex-plate work. i didn't search for very long but i found a few post on a quick google search that said some of the older gm 6.0s have no need to adapt them because of a longer crank. and others said different. but i dont know. do i need to buy a different flexpalate or just use the stock flexplate.
