GTA91

iTrader: (1)

I'm still thinking about a T56-to-700r4 swap. I just can't decide. Selling my T56 and getting the money shouldn't be a problem. It seems like everyone wants a T56. LOL What kind of gains do you guys think I'll gain by just going to a 2800-3000 stalled auto over my T56/3.42s? Also, anyone else running a 700r4 and 3.42s? According to f-body.org's MPH/gear calculator its going to run down the interstate at 2500RPMs at 80mph. Does that seem right? What kind of MPG you guys get with a 700r4 and 3.42s. Also what disadvantages do the 700r4 and stall have??


*I'm thinking about a pro-built auto and a vigilante converter

jimmy_mac

When I break my WC-T5 I plan on going with the 700r4. It is just really difficult to get traction out of first gear with a manual trans. I think the T5 and T56 have similiar 1rst gears. With the broad torque of a "cammed" 350 I think the auto trans with 2800 rpm stall is the way to go at the drag strip. An the overdrive makes it liveable on the highway. That's my opinion

GTA91

iTrader: (1)

yeah, the T56 is actually geared really high out of the hole. It only has a 2.66 1st gear compared to the T5's 2.95 and the 700r4's 3.06 ratio. I love driving the stick, but I think I'd rather be faster at the track with the auto

vjo90RS8

iTrader: (1)

Pro Built automatics ( www.pro-built.net ) sells a Street/Strip Th700r4 that is suppose to handle up to 550HP with their ACT 9.5" torque converter. The tranny is $1395 and the TC is $565. THis is the setup that ill be going with this summer.

Motopsyco

I recently put in 3.42s w/my 700r4, the two seem to work together great, I dont have a higher stall converter or anything, but so far i love it, just the problem with the 2500rpms a highway speeds seems to literally suck the gas right out the tank, but city driving has improved since i no longer need to put it half way to the floor to get upto speed w/my non-lower end torque cam.

vjo90RS8

iTrader: (1)

I have 3.73s in my auto 90 RS and i have not noticed any difference in gas mileage with the gears. About once every month or so i drive home from college (250 miles each way) and notice about 22-25mpg. RPMs are not that bad, 3.73s in 4th gear makes the car run at lower RPMs than if you had 2.73s in 3rd gear. Im not at 2500RPMs until i hit about 75MPH.

Zepher

iTrader: (1)

Wanna trade tranny's and computers?
I've got a complete 4L60E Manual to Auto swap-over kit with transgo shiftkit already installed.

GTA91

iTrader: (1)

Thanks for the input guys! I might be selling it in the next month to a guy and calling pro-built! Thanks again! Also, does this all sound right???


Parts:
700r4 tranny
vig stall converter (3000rpm)
auto x-member
flexplate
correct speedo gears for the tranny
remote mount tranny cooler (B&M or something)
auto shifter
TV cable
some sort of TCC lockup device

*Anything else I'd need?? Any thing else I need to be warned of??