Just curious as to what transmission setups you guys are running. I am considering swapping my T56 out for an auto, im assuming i should go with a 4l80 to keep O/D. I want something that will stand up to 700-800 wheel. School me!

 

th400 with 3.00 gears. I liked my overdrive but there really isn't a huge difference

 

What size tires do you run and what RPM are you at at say 65-70 mph? I currently have 3.25's in my car.

 

T400, 3.36s, 28" tires = 70 mph(gps) @ 3000rpms.
Thats with a tight 10" converter.

Its very liveable but it is thirsty on the hwy. If you can pull off the 4l80, I would... Then you can gear it for the 1/4 but still cruise easy on the hwy.

 

with my 400, 28" tire and 3.00 gears I can turn 2900ish @ 75ish

 

Go 400, thats what im going to do,or maybe a rockcrusher

 

My car is mostly driven on the street but i would really like to do a lot more track time. I think i will need O/D

 

i love my 4l80 for driving on the highway...mine has 3.54 gears (dana 60)

 

RPM 4l80e is what im going with.. Costs a little more but mines going in a high HP street car so OD will be a must.

 

If your on a budget go 400. The 80 is your best option for a really fast street car. expensive though. I run a flt level 7 4l65e with a trans break. 3800lbs car goes 10.1 @137 all day. But if I could do it all over again id go 80 because its stronger.

 

Money isn't overly tight. I would rather have the car the way I WANT it rather than make sacrifices that I will regret later. What do you 4L80 guys have into your swaps?

 

Search my thread in the auto trans section. I did a 80 last year.

 

Keep the questions coming, its going to help me decise as well. Jakes transmission 80e seems to be the cheapest place if you have a pre 98 core. How much abuse can stock 80e handle?

 

I have less in my 4L80 swap than what I sold my T56 for. My trans is stock though with a HD2 shift kit. We will see how long it lasts.

 

I have a TH400 built with good clutches, new steels and HD sprag.stock VB with performance shift kit. Yank 3500 stall with 3.08 gears in my Foxbody

i bought the trans for 80 bux and spent $600 having it built...not bad for a trans that will hold 700 plus HP and a **** ton of tq

 

I too want to go auto in my cobra, its the same thing th400 or 4l80( i refuse to attempt a built 4r70w). I think 4l80 is the way to go for sure there really is no down side besides cost.

 

Is the 4L80 much bigger than a 4L60? Like width and depth?

 

Yes it is bigger. There are pics in the automatic section here.

Make sure that you buy it new from a vendor or get a stock one and put a shift kit in it.

 

Good to know od is a must on a street car. Lolz

 

Im running a 4L80E with a Transgo HD2 kit and Yank PY3600 with around 700rw and 3.42 rear gears with 26" tall tire. Below 3000rpm at 80mph. Its great. If I did it again Id use a Circle D triple disc converter though to use the lockup at full throttle. Check out Jakes Performance for some bad *** 80E's with transbrakes.