T-400 Vs Powerglide

[67SS]

I have a 3350lb 500CI Chevelle, 4.30 gear 29x10 tire. I am thinking of switching from the PG to the 400. Does anybody have some before and after comparisons on Et and mph? Either way from a 400 to a PG or PG to 400.

I need to gain a couple of tenths in my car. My car will run 10.10's in good weather and 10.2-.3 in "bad" air. The guys I race with all run three speeds and say the PG in a 3350 lb car takes to long to "wind up" and I would be better off switching to a three speed.
The guy I bought the car from used to run a 400 but switched to a PG to try to make the car more consistent for bracket races. I really remember him telling me that the times didn't really change. I could be wrong.

Any Ideas and Suggestions?

[sunsation540]

viewtopic.php?f=5&t=1261 ...... try that but to follow up i have a glide in the car, and sold the air shifter and 400 and gave the extra drive shaft away.... to date spragless trans spec converter and a gear change to 4.10s have ran 5.62 @126 on a 275 hit and 9.09 @ 150 glide and 4.10 and runs 9.70s on the mtr...the turbo was to unforgiving with HP.. you will have to chase the converter and chase the converter.. NA vers hose 2 diffrent animals..on a small tire the glide is MY Friend john..C

[67SS]

I was also worried about the hookup. I figured I would have to change the rear gear back to a 4.10 with the 400, but didn't know if that would hurt or just offset the gear reduction and I would be right back to where I am. (Except my wallet would be lighter)

In the classes I run (Nostalgia Super Stock) I cannot run a brake or any kind of electronics. (no nitrous either) I can step up the tire size to a 10.5W, but it will not fit in my stock wheel well and I don't want to cut my car up. Several of the guys have gone to 4 speeds to get these big pigs out of the hole.

So if I read the posts right, your car is quicker with the glide?

[Bob West]

You dont need a 4 speed to get them out of the hole. I am running a th400, 4.10 gears with the tightest 8" converter that ATI makes @ 3680lbs. I leave at <1500 rpms. Just takes a little suspension work.

[67SS]

I have been talking to a couple of engine builders about this and they have all said to raise my stall speed. I need to hook up my trans brake first and see what I can actually stall, but they have all suggested right at 1000 rpm below my RPM going through the traps, which would work out to be about a 6000 stall.

[DOTracer]

I think you need more than 1000 rpm difference if you want the converter to lock up efficiently.

My old converter flashed between 5900-6150 depending on air conditions and the engine saw between 7600-7700 through the traps. Converter slippage off the data logger was 5 to 5 1/2%.

[sunsation540]

Dot racer is right closer to 1500 rpm the 4.30 and turbo might be a touch faster..traction needs to be at it's best bob west's car is a nice piece , there are things you can do at 9.90, that will get you in trouble at 8.90.. try the turbo a spragless converter and in the 5500.5700 flash stalls.

[freezy74]

So how did you make out?

[Hitchcock]

You dont need a 4 speed to get them out of the hole. I am running a th400, 4.10 gears with the tightest 8" converter that ATI makes @ 3680lbs. I leave at <1500 rpms. Just takes a little suspension work.

Its pretty hard to argue with this logic. This big ol thing rund 9's. What kind of suspension are you two running up front?