3.08s and 200r4

just wondering if these will be ok with a 28" tire?

i know normally it'd wouldnt be enough for an n/a car

but its the setup I thought would still do well behind a 650-700hp and matching torque twinturbo build

i had 3.42s beforehand and downsized to 3.08s so it'd be less likly to break loose the tires on the streets while low enough not to lug in engine in O/D

 

Unless you are prepared to spend a ton of money building your 200r4 to stand up to that power level, I would use a T-400.

I've browsed through the Turbo Regal forums enough researching my 200r4 swap to realize they can become a money pit if pushed too hard.

Why spend $4000 in a trans when a $1k T-400 will outlast it and work nicely with that gear ratio. 3k buys a lot of fuel!

Brian

 

Currently, I'm running a 200R4 behind a stock 350 with 2.52's. I have a set of 3.73's but just haven't gotten around to having them put in.

 

4k is a bit inflated. it costs a bit more for a 200, but not 4x. he can build one for about 1500 that will live a long happy life.

 

janis transmissions quoated me 1800 with my core...not sure if it included torque converter but definatly everything else

 

I'm thinking that with the .67:1 overdrive and 28" tire the 3.08:1 rear will be too low. Anyone else? What tire height and rear axle ratios did the GN use?

Devon

 

26.6? w/ 3.42s and corperate 8.5

i was thinking 3.23 since it its a v8 compared to a v6

youre probalby right about it being too low
it'd probably put me at a 2.10/2.20ish ratio in 0/D effective ration in third would be 2.94

 

He probably will only use the OD at highway speeds. at 45 mph, it would be too high for sure. unless he had a small cam.

 

I was thinking he'd probably have to do the same.

Devon

 

I have a 2.56 rearend, and I do a lot of highway driving (about 7500 miles so far this year). Sometimes I think that an OD with a lockup would be a nice thing to bring the revs way down.

I wouldn't even consider going that tall without a lockup convertor, the slippage would heat your trans up and kill it quickly.

And make sure your engine works well at such a low RPM (cam design, etc.). Pulling a moderate load at only 1500 RPM is not typical for older most motors.

-Bob C.

 

so 3.42s would put me at 1648 rpms at 60
3.23s would put me at 1555rpms

so i probably should have kept my 3.42s
i exchanged them as i was thinking an st400 would be more reliable for the price and more fun.

****s still up in the airou:

 

that's the built motor, i'll just be running a stock 73 motor with 8psi till i get i get couple top end parts(chevy roller rockers, cam, and big valves) for the built motor along with cash for porting heads and getting it put together

 

ah, i think i'll just stick with my th350 and ad my trans go shift kit with the stock twinturbo combo aand just go with an st400 like planned before by jim weise for my built motor...if i still feel the need for an o/d i'll just get a gearsvender later down the line (.75 0/d) cant be too bad if caprices had .70 o/d with 3.08s
that'd put me at 1673 rpms