Magnus

iTrader: (4)

I'm extremely swamped right now but have several setups in the future that are going to make my 4L60E cry, even at my low raceweight.

I am thinking of going with the TH350 instead of the TH400 because of my 2900'isih lb raceweight..

Next setup will most likely run 10.5@130 and the setup after that could hit mid 9's over 140...

Trans brake is a requirement.. I'm looking for some 1.2 60's..

So, anyone think that the TH350 w/brake will be reliable for this setup?

I know Colonel was running a TH350 into the 9's..

SL0WNESS

Are you gonna be using a stock gearset? I dont know a whole lot about the TH350/TH400's, but i dont think it would take the power to go 140's through the 1/4 reliably.

squinn

I'm running a th350, have yet to really play with the t-brake, have gone 1.271 foot braking it.

I'v had good luck with it holding the power, as i'v been running it since 99'

tektrans

iTrader: (23)

If you're gonna go with the TH350 I'd go with the Rossler. I know of one of the Cartek cars that went 9.40's at around 140mph with it and I've heard nothing but good reviews about them. I have the Rossler 350 in my car and it's set up to run mid 9's but I haven't run the # yet so I can't speak from expericence.

Big Mike

iTrader: (4)

Magnus, here is what you need. My car is the car tektrans is reffering to.

https://ls1tech.com/forums/lsx-parts-sale/263425-sale-rossler-th350.html

SL0WNESS

Very nice short time for the power you are putting down. Those numbers are through an unlocked converter i take it? Is that a stock gearset tranny?

Pro Stock John

iTrader: (34)

Steve Quinn's car (squinn) is set up along the lines of what you are looking to do Keith, he's somewhat light and not running big cubes right now. Car is quite impressive.

Magnus

iTrader: (4)

What gears are in the tranny? Who built it?

xaon

iTrader: (12)

no problems with Dan's car (White HPE Trans Am), has done a 1.31 60' 9.64 @ 141mph, 3160ish raceweight. TH350 with no trans brake

SL0WNESS

since you guys arent saying anything about these trannys....... are they stock gearsets in them or not???????

Magnus

iTrader: (4)

Thats what I'd like to know.

kp

iTrader: (34)

No trans brake in my TH350 in my old 2000 SS, ran mid/high 10s for a year and a half at ~3500lbs. After ~80 passes it started making funny noises, just caught the intermediate roller race before it let go (stock with an aftermarket outer race), replaced it with a TCI 36 element sprag/direct drum. About 50 passes later it broke the forward drum where the input shaft goes in, replaced that and no more problems for 120 or so more passes and the trans is still going in another low 10 second car.

Mine had a TCI 2.75 1st gear in it, usual red eagle clutches/alto steels and all torrington bearings. TH350s are one of the easier transmissions to fix and they hold up pretty well if you use the decent parts, number one failure point is the intermediate roller clutch on the direct drum. They are also super easy to fix, rebuild and get parts for. This car has a TH400 and I just put an aluminum forward and direct drum in along with a few other lightened parts and its still a tank trans - if I wasnt so lazy I'd put a TH350 back but I dont feel like building another trans

JS

iTrader: (4)

Your car is 2900lbs Mag,GO GLIDE
Mikes is the BEST BUILDER OF TRANS BAR NONE,he's $$$ but worth every penny..

Otherwise I'd go 400 with BRAKE.....

squinn

Stock gear set

Percision Transmission, Sarnia, Ontario

I'v had very good luck with this trans

Its gone thur ever other year, it looks new when taken apart

Magnus

iTrader: (4)

Alright I need to make a decision asap.. and am still not sure what route to go..

Whatever route I do it will be with a trans brake and non-lockup converter.. so either TH350 or TH400...

My next setup (cam only).. has to run 10.3... a stretch but so is 10's stock internals NA...

Then my setup after that which is already in the planning stage is a Futral big bore LS2.. should run mid 9's..

My raceweight is about 2950..

What route do I go? TH350 or TH400.. I was going to call up Rossler tomorrow to see what they think but I figured I would pick some of your brains first.

I am not sure how long it will take to have a tranny built but I doubt my 4L60E will be ok with low 10's..

- Up the river without a transmission.

squinn

I plan to take this trans to the low 9's, also I just foot brake it

Magnus

iTrader: (4)

why not t-brake it?

squinn

so far I have not gone faster with the t-brake, as Joe O an mikey have also found the same. I want to do some more testing this year to see if I can get it to go faster on the T-brake.

Magnus

iTrader: (4)

Why do you think that is? Traction? Bog? RPM?.. very interesting find.

squinn

It might have something to do with not loading up the Suspension, it hooks, no bog with the tach at 6k. Might be the same reson 6 speed cars don't 60 that well.