what build do you want to see?

[ghettosled]

lets be honest, how many guys out there with 10 sec trucks actually take long freeways trips or care about freeway gas milage?

The 3rd in a 350/400 is 1:1 so it will be the same as keeping the 700 in D. Then swap the gears, and it will be a bit less.

For the most part I dont think the 3 speed is the best choice for daily drivers or people who commute on the freeway. However, chances are you dont drive your 10 sec truck daily or commute to work with it. If you are someone like Morgan or Andrew S. you have broken more transmissions going 12s then probably all the 10 sec trucks combined, so it also really depends on your driving habits. It really boils down to a per truck basis.

 

[tealty]

yeah if some of you think the 400 trans would be bad at highway speeds, look at most of the rustangs with C4's (1:1 3rd gear) and 4.10 gears with 26-28" tires. Ive seen several of them hop on the highway no prob and never complain, but they only do about 60-65mph.
Mike, why the 3.08's? Yeah they would be good for cruising on the freeway, but I think the 3.27's would prolly be better. Isnt the first gear taller in the 400? So wouldn't a super high gear like the 3.08 with the 400s' tall first gear equate to a shitty launch? Maybe i'm thinking of it as making a huge difference than it really will. I dont know. I just think the 3.27 would be a perfect medium between a tall gear and the stock 3.42. Hell, I have a th400 trans and 3.55 gears in the rustang and its not bad at all.
later
Jordan

 

[ed hess]

So wouldn't a super high gear like the 3.08 with the 400s' tall first gear equate to a shitty launch?

yeah they really make it launch like a turd.

best i could ever get was 1.42 60ft .... wish i had never changed from a 700 to a 400... probably woulve been better to keep the 3.42 gears to...

hey mike

i think at this point you outta just go build whatever ya want...

ed

 

[SeattleSy#1255]

lets be honest, how many guys out there with 10 sec trucks actually take long freeways trips or care about freeway gas milage?

The 3rd in a 350/400 is 1:1 so it will be the same as keeping the 700 in D. Then swap the gears, and it will be a bit less.

For the most part I dont think the 3 speed is the best choice for daily drivers or people who commute on the freeway. However, chances are you dont drive your 10 sec truck daily or commute to work with it. If you are someone like Morgan or Andrew S. you have broken more transmissions going 12s then probably all the 10 sec trucks combined, so it also really depends on your driving habits. It really boils down to a per truck basis.

right so i guess that is my point...the build you are looking to do is not for someone who wants to drive there truck around much but more to the track and back...which isn't a problem, but doesnt' appeal to most people. Not condeming anything, i think you have great ideas, but if someone wants to drive there truck 2-3 days a week to work during the summer, it doesn't sound like a 3 speed is the way to go...like i mentioned, more of a track truck.

 

[ghettosled]

i dont think they make a 3.27 for our front diff.. Either 3.42 or 3.08.

The idea with the taller first gear is to launch closer to your peak RPM curve and boost level but not anhilate the tires in the process. This is why all the fast drag radial cars use powerglides and not th400s. That coupled with the fact that the motor has a hydaulic cam, and you can only spin it so much. With a 3.08 gear and 26" tall tire you can run close to 140mph. I guess if i needed to spin it higher with a hydraulic cam i could run the schubeck lifters and a more aggresive cam.

 

[TurboPhoon]

When i was talking to the tranny guy in the shop i worked in he said that the 4l80 takes quite a bit more power than the stock 700 (makes sense). But i didnt ask him about how it compared to a t400. Dose anyone know how close they compare? Or is this not going to matter because of the power output you are going to be aiming for?

 

[tealty]

Mike,

Yeah im not sure if they make the 3.27's for these trucks either...I doubt it. You could probably get a custom gear ratio but thats $$$.

Ed....Yeah a 1.42 60' blows. You have 3.08's in your shitbox (haha...j/k)? How tall are your tires?

Later
Jordan

 

[ghettosled]

the 4l80e is basically a th400 with an overdrive, so they will both steal a little more power then a 700..

 

[bigtime]

the 4l80e is basically a th400 with an overdrive, so they will both steal a little more power then a 700..

I would say the 700 is worse than a 400.
4l80e most
700r4/4l60e
T 400
T 350 least

 

[ed hess]

lets see here..

best time with 700 trans = 11.9

1st time out with 400 trans = 11.9

no power loss here!

is this one of those rumors, what do they call it, urban legends kinda things?


ed

 

[bigtime]

lets see here..

best time with 700 trans = 11.9

1st time out with 400 trans = 11.9

no power loss here!

is this one of those rumors, what do they call it, urban legends kinda things?


ed

I don't think you can use that as a comparison. to many variables. the gear spread on the 400 versus the low first gear on the 700 could have cancled each other out.

 

[ed hess]

lets see here..

best time with 700 trans = 11.9

1st time out with 400 trans = 11.9

no power loss here!

is this one of those rumors, what do they call it, urban legends kinda things?


ed

I don't think you can use that as a comparison. to many variables. the gear spread on the 400 versus the low first gear on the 700 could have cancled each other out.

huh?

oh yeah i see what you mean.

if it ran the same after as it did before and you didnt change anything else then you just have to think that something else must be involved therefore it must be takin power away. yeah that makes sense to me. thanks for clarifying this bob.

ed

 

[bigtime]

lets see here..

best time with 700 trans = 11.9

1st time out with 400 trans = 11.9

no power loss here!

is this one of those rumors, what do they call it, urban legends kinda things?


ed

I don't think you can use that as a comparison. to many variables. the gear spread on the 400 versus the low first gear on the 700 could have cancled each other out.

huh?

oh yeah i see what you mean.

if it ran the same after as it did before and you didnt change anything else then you just have to think that something else must be involved therefore it must be takin power away. yeah that makes sense to me. thanks for clarifying this bob.

ed

I think the anount of difference would be in the 5-10 horspower range and without doing back to back with the same everything you would never be able to see it.
I do know we put a 4l80e in bobs monte in place of a 700 and lost a lot on the dyno but when i took my 700 out and put the 400 in i picked up power. But since none of this was done in a controlled situation it is all specultive.

 

[bigtime]

one more thing i forgot. ET is not a good judgement of horsepower. once again to many varibles contribute to ET. MPH is the only way to judge (we still have air density and wind resistance but still better than ET)
How close was the mph??

 

[TurboPhoon]

With all this info out i think that a t400 would be a decant choice for what you are building Mike. I didnt know how close then 700 came to a 400. I just thought it would be neat to see a syty with a 4l80 running in the 10's and still retaining the awd. Cost wise the 400 dose make a lot of sense. On the side note what heads are you thinking about puting on it. I personally would like to see some of your ported vortec on her. Good luck with the build :rock:

 

[ed hess]

one more thing i forgot. ET is not a good judgement of horsepower. once again to many varibles contribute to ET. MPH is the only way to judge (we still have air density and wind resistance but still better than ET)
How close was the mph??

bob

dont remember...

who really gives a shit.

your shit works, my shit works. works for me!

ed

 

[bigtime]

one more thing i forgot. ET is not a good judgement of horsepower. once again to many varibles contribute to ET. MPH is the only way to judge (we still have air density and wind resistance but still better than ET)
How close was the mph??

bob

dont remember...

who really gives a shit.

your shit works, my shit works. works for me!

ed

:tup: :rotf:

 

[ghettosled]

Ed,

I had a friend swap over to a powerglide and he lost almost 100hp at the wheels, but he gained a few tenths due to better efficiency then his previous trans..

As for the heads, they will be vortecs with stock manifolds. I may also try to figure out a way to make affordable headers.. something along the lines of a pair of N/A headers, flipping them around and building a crossover pipe with turbo flange. Building them from scratch would be too expensive, as people already complain $1000 is too much for headers. I would have to look at some options and maybe buy a couple sets of headers to test fit.

 

[nightdiver]

Just choose a set that wont burn the wires.

 

[KGB Pilot125]

having a 350 trans isnt so bad, this last weekend i took the TT truck out for a little saturday drive to lunch and the grocery store. I dont do any freeway driving with it but to get to town you go down a 2 lane highway where the speedlimit is 55. it really doesnt turn that many RPMS ;ess thean 3000. the biggest pain in the butt is the manual shifting valvebody because if you shift before 3k it wont shift then your kinda stuck in what ever gear you were in until you slow down and can down shift at a stop.

I would like to see a reliable low 11 or high 10 sec truck that doesnt cost 15k to build. use whatever you want as long as its off the shelf stuff.