wildn347

iTrader: (19)

i looked but really couldnt find the answers i was looking for. For the guys who are street driving there th400 what are yall taching on the interstate im trying to decide on if a th400 will be right for me or a 4l80e. I plan on drag racing it alot but also would like to hop on the interstate every now and then..just want to know what yalls rpms are at around 55-70mph.. thanks in advance

silverz28camaro

iTrader: (20)

what tranny do you have now?

wildn347

iTrader: (19)

none i sold my t56 a couple months ago and havent been able to decide what trans i want to go with thats why i asked what rpms some ppl are taching on at low interstate speeds

spaz1

iTrader: (9)

to o/p if you are running a 6spd stick it in 4th and that is about what you'll be running with a th400 plus say 10% converter slip... If you are running a a 4l60 stick it in drive and rest your foot on the brake pedal so the converter stays unlocked and that's what the th400 will be reving at.

silverz28camaro

iTrader: (20)

Well im at 2800 with 26inch tires with 3.73 gears, and the 4l60e in od at 75mph

when Mt od went out I have to just run it in d witch is 3rd same as th400 and from what I cam remember it was 3,000 at 65ish, i still drove it 65 miles to the track to drag race it but it didn't feel like it was good to cruise over 70.

wildn347

iTrader: (19)

i dont have a trans in my car the current moment thats why i asked what rpms ppl are at.. im not talking like 80mph im talking like crusing at 65mph

silverz28camaro

iTrader: (20)

Yeah thats what I was going to say but his has not tranny.

wildn347

iTrader: (19)

i can deal with mid 3k rpms.. i just dont want it to be like 4k to 4500 rpm

silverz28camaro

iTrader: (20)

Yeah it wasn't horible, plus with the strenght of that th400 and if you get a big stall like 3600-4000 it should rip.

wildn347

iTrader: (19)

thats what i was thinking myself.. for the price i dont think i can go wrong

silverz28camaro

iTrader: (20)

what were you running before with the 6 speed? and what other changes besides tranny are you doing?

wildn347

iTrader: (19)

on the interstate before i was taching 2300rpm that was with full bolt ons,ms4 cam,9in with 4.11s... my new setup up will be a forged 347 with prc stage 2.5 ls6s with a custom cam and fast 90/90 if thats what you meant by what other changes are you doing..

silverz28camaro

iTrader: (20)

I ment 1/4 times, those 4.11 will put you closer tto 3200-3300 at 65. a 9 inch is easy to do those 3.73 may be worth looking into

wildn347

iTrader: (19)

well i only got to run the car with the exhaust and 4.11s on it i only had 3 passes and my best was 12.9 w/1.8 60. had a lifter colapse on me before i could make it to the track with the ms4... yea i was looking at maybe swapping them to a 3.90 gear

TurboAv

iTrader: (6)

I run a TH400 with 3.46 gears and 26" tall tires. At the time I had a 4000 stall. If I remember correctly 65mph was 3200ish.

209ryder

iTrader: (2)

I have a th400 with 4000 stall and 410's and im taching like 3200rpms with a 28 hoosier slick...love it wouldnt trade it in for the world it rips with cam and a few other things !!!!

Z28/2002

iTrader: (27)

At 55 mph I'm at 3300 rpm with a 27" tire, TH350 and 4.11s

19trans_am98

iTrader: (3)

3.73's 26" tire around 3k at 60mph

wildn347

iTrader: (19)

anyone went with the th400 and wish they would have went 4l80..i cant deciede which one i want im leaning more towards the th400 but thats gonna make for one loud ride going down the interstate at 3200 with true duals lol

slow67

iTrader: (2)

I went with a 4L80 and haven't regretted it one bit.