3 speed auto
 

is there n e one that has tried this a gm 3 speed tranny

We got people asking for 6 speeds, people asking for 3 speeds. Whats next, skid steering?

im asking about a 3 speed gm automatic like a th 350 tranny

get a th400 if you are going to the trouble...

its not necessary

Depending on the gear ratio for the trans you'll probably need to run a much lower rear end ratio.

Also, if your going to drag race it (which I assume you are) you prob need a REAL high stall, I'd say in the 4500-5000rpm range if you have a large single (which i assume you do given your sn).

well the gear ratio in the tranny ima let the guys at fb performance help me on that, they already sponsored one of our customer car, Albert Diaz with the grey supra soon to hit 8.50s as a street car, i have to ask them which rear i should us the fd automatic rear or the 5 speed

Just make sure its greared real low. It the trans is greared high (which it prob is being a 3 speed) then your going to need a super low real diff gear.

You know its going to kill your top speed, right? If you gear it to give you the same acceleration you have now your going to max out around 100mph unless you take it up to 10K rpms lol. Then if you gear it to have some top speed (say 150mph) then your going to hurt your acceleration.

STEPHEN

Why? Extra weight? :D

If you're going to the trouble, use a more modern 4-speed automatic like the TH700-R4/4L60 (4L60E is the electronically controlled version) which was used in the Camaro/Firebird. They can be built to handle far more power than a 2-rotor engine will dish out reliably, and parts (including stall converter choices) are abundant. In addition, you get an overdrive gear for highway cruising, and weight equivalent to the older TH-350.

1st gear - 3.06:1
2nd gear - 1.62:1
3rd gear - 1.00:1
4th gear - 0.70:1

I totally agree with Jim, the 700R4 would be the way to go due to the overdrive and low first gear. If you really want a 3-speed get the TH350 over the TH400. It is lighter, takes less torque to spin, and is plenty strong enough (I know at least 2 people running high 9 sec quarter miles without problems).

I was thinking about this jim, i believe this was use on a grand national that made good power and good runs, when i go to FB performance because they want me to go there because they making a display for the rotary engines, ima ask them about this

what the horespower range on those trannies

grand nationals have a 200 4r

yeah that right