Carter01

iTrader: (11)

Yeah, that's a good 60. What type power do you make? What is your race weight? I believe my car should 60 in the high 1.5s in better air, if I can hit a 1.62 in this weather high 1.5s should be attainable. After hearing severla members talk about my converter and the gas, I can't wait to spray it. I hope it's a beast on the jug

rmata

iTrader: (34)

Let me give you a rundown of how my car reacted to drivetrain loss. I put down 469hp with a 6 speed and a 10 bolt. Then I put down 445hp with a 6 speed and a 9". Then I swapped to a th400 and on a 150 shot of nitrous only put down 499hp. This leads me to believe I lost quite a bit of hp due to the swap. The crazy thing is that I only gained 1 tenth in the quarter mile and lost 2-3mph. I drove the 6speed pretty damn good and I miss it, but the th400 is much better to hook on the street and that's where most of the racing around here takes place since there isn't a drag strip within 2hrs of here.

Carter01

iTrader: (11)

Totally agree with you on hooking on the street with the th400. If you lay into the throttle just right it will tear out the hole without spinning, that is with my 275/40/17 Mickeys. For comparison sake it would not do the same with the 6sp on the same tires.

Villain281H

iTrader: (5)

Keep in mind that 2100 DA is likely a high water grain # versus a 2100 DA in the fall or spring that might make it a tenth or so better. Cool air can't come soon enough!

Derek

xtreme2001

no idea on power......maybe 400 flywheel hp........just a sbc with sportsman 2 heads aand a performer rpm intake.lt1 comp cams xfi hyd roller cam with 584 in 579 ex lift with 1.6 comp pro mag roller rockers....all motor..car is actually faster than when i was running the th 350 trans........right now with the heat in mississippi its running 7.30's in the 1/8 with a 1.57 60 ft and in may i went a 7.20 with 1.52 60 ft...all on 28x10.5 mt et drags

car has only had the heater box and a/c removed from under the dash.....power windows and seats.and back seat delete....and stcok 10 bolt with ta cover and moser axles. so i'm guessing 3500 with me in it..may be more may be less

krissoto

iTrader: (3)

One thing that I seen no one has mentioned is you put a 9" in the car also. Isn't that suppose to soak up alot of hp? Your first pass was on the 10 bolt, and now your running a 9".

Villain281H

iTrader: (5)

Yep, the 9 inch rear will definately take up a little more power as well....

Derek

xtreme2001

i have heard the same thing also...........even with a th 400 it takes more hp.........i guess my car is a freak with the th 400 though........i am .4 faster this year than last year........went from th 350 with the same converter that's in the th400..........and i mean same...i swapped it to the new trans.........and i built both transmissions...

SuperSlow02

iTrader: (16)

I ran my car back to back 10 bolt vs 9"...lost no MPH, dont have a dyno though, so thats the best comparision ive got

Villain281H

iTrader: (5)

Super slow, on the same day, same gearing, in the same weather conditions? Reason I ask is there have been published results showing the differences in controlled climates, so I'm curious.....

Derek

94Z28rag

iTrader: (10)

Bingo. Not happening.

RamAir95TA

iTrader: (2)

I think this speaks for itself.

black01_WS6

iTrader: (13)

I have had this same stall for awhile now- and am putting it in my car with the th-400. My car made 433 with the 6spd. We will see what she does with the th-400.

I will report back with #'s when it gets done.

SuperSlow02

iTrader: (16)

Pretty close, fall weather, same gears except 4.11-4.10. My point was where it matter'd it didnt hurt the performance of the car. Couldnt tell ya as far as DA was concern'd

94Z28rag

iTrader: (10)

Both SAE

WS6TransAm01

iTrader: (13)

Then why go to a TH400? Less fun on the street and if you can drive a stick, which it looks like you can, the ET diff should not be HUGE... plus, its not like the cari s running 8's , with a high 11 second car the difference is minimal from a well driven m6 to an a3 like a TH400...

Either way, there are way to many changes and variables to say this is a legit comparison from M6 to TH400.

SuperSlow02

iTrader: (16)

Cost of clutches, time and effort to replace them, and still have to worry about with breaking the 6speed. Least thats why I swapped

Nitroused383

iTrader: (10)

Here is some good info on rwhp loss with other rear ends. To me it seems changing gear ratios has a bigger affect on rwhp #'s than a 10 bolt vs 9" has. https://ls1tech.com/forums/gears-axl...high-tech.html

I will say I've gained 33 rwhp since last year, last year with the 3.42 geared 10 bolt I ran 115 mph in 4000' DA. This year with 33 extra rwhp, a 9" with 4.11's and similar DA I'm trapping 118 or so mph. RWHP numbers may change but cars don't seem to slow down with rear end swaps.

99TransAmLS16Spd

iTrader: (8)

I agree. At high 11's, I think other mods could have been much more beneficial to et than going with the 400. I'm not knocking the op or anybody that goes that route - that's just my opinion. I am curious if the OP tried running a launch controller with the M6 prior to going auto?

Also, when I went from the 10 bolt to the 9", with no engine modifications, I picked up 1 mph in the traps. Overall weight of the car stayed roughly the same, but I reduced rotating mass by going from et radials to slicks and going with the strange drag brake set up in the rear. Yes you did read that right - I went from the MT et street radials to the MT et drags and gained mph. I should add the 9" inch is a 35 spline and spool

Carter01

iTrader: (11)

Wow, this thread is going off track a little.
1. I made the th400 swap because I wanted to, the track performance was not there for me. I am also planning on spraying the car in a few weeks and I felt the auto was a little safer choice on the gas.
2. I am not trying to mislead anyone on the swap by no means, I mean I posted almost every variable I could to be consistent.
3. These are my results, dyno and track numbers, not some G-tech or SOTP dyno.

These are my REAL WORLD results. I can't get more real examples.