like it says whats the apt. top speed of the th400 with a 4.10 rear? looked in the th400 thread and didnt see it

 

depends on the stall and tires.

 

i dont know the stall yet(any help would be cool) and 15" tires

 

you could over gear your trans and move your rear gear closer to 3.00. that will make more top end and retain bottom performance.

 

so make the rear a 3.00?

 

Depends on the actual tire diameter and what your willing to spin your motor to. Mine with 4.11's and a 275/40/17 tire tops out around 120 at 7000 rpms. This is with a non lock-up converter too.

 

alright, since im runing 15's i will prob have a top speed of around 110 at 7000? (guestment)

 

i have 18's with 3:55 gears and mine is 138 at 6300 rpm's

 

What is the OUTSIDE diameter of your 15" tires? That's what matters.

 

If 15" was the outer diameter of the tire, your top speed would be about 60. With a 26" tire and a 5000 stall my cas top speed was around 130. With 28" tires it will be higher but I have not figured out what it will be yet, but hopeing around 160.

 

why does the stall speed affect the top speed? i don't know much about automatic transmissions and torque converters

 

i really dont know that much about them either, not as much as i would like to, so if anyone would do some schooling, be my guest

 

Because it is not directly connected to the drivetrain. The larger the converter, the more slip. We run a 29.5 tire, 4.33 gears, 6700 rpms through the traps, with a B&M 8" converter (10% slip) .... our trap speed is at 121. It will probably be higher with good traction and better weather as well.

 

http://www.race-cars.net/calculators...alculator.html

Just put in your Tire Size, Rear End Ratio, and RPM and it will give you your MPH. If you are running a loose converter subtract about 2mph.

 

JACKPOT!?!?!?!?
thank you all

 

why not use a lockup converter then?

 

Because the TCC is not capable of supporting such high demands of WOT. It is a thin contact patch that was designed for economy, not drag racing.