Good Morning All.
Just a general question about going from a Turbo 400 to a Power Glide.
Basic 2900 to 3200 pound bracket car.
basic 540/565 BBC making around 900/950 HP.
Basic ET should be 5.60 to 5.80 in the 1/8 mile.
Will it pick up ET/MPH or slow down, or stay the same.
Just a general question.
Thanks again
Calvin

My 3200 lb. Firebird with the same HP slowed down. Also went from an 8" converter to a 9" converter

made the switch years ago,had to make a rear gear change from 4.10 to 4.86 and then the glide was better

my 4.86 rear gear remained the same as it was with the turbo400.

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Just a general question about going from a Turbo 400 to a Power Glide.
Basic 2900 to 3200 pound bracket car.
basic 540/565 BBC making around 900/950 HP.
Basic ET should be 5.60 to 5.80 in the 1/8 mile.
Will it pick up ET/MPH or slow down, or stay the same.

What diff gear now? What first gear ratio in new glide?

My 67 Camaro ran a little faster with Glide. Lost a few in the 60 foot but made it up and more by finish line. And it was more consistent with the glide and much smaller wheelies. 14x32 -4.88 BBC with 8" converter. I did not change rear gears or converter when I swapped from T-400 to Powerglide.

your '67 Camaro was a cutup shytbox altered with a small block NOT a

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2900 to 3200 pound bracket car.

and did NOT have a

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540/565 BBC making around 900/950 HP.

nor did it run

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5.60 to 5.80 in the 1/8 mile.

Weight difference alone should have a gain in ET but you will have to change the rearend gears.

As I have proven recently and in the past on my other cars, removing as much as 40 lbs. shows nothing on the time slip with our cars.

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Originally posted by 1320racer:
As I have proven recently and in the past on my other cars, removing as much as 40 lbs. shows nothing on the time slip with our cars.

Ed, in the Firebird racing SST, does it shift the 1-2 during the throttle stop time? If yes, what time does timer start after launch?

With a glide, it is spinning considerably less internal rotating weight than a th400 and could increase the mph.

Thats what mine did when I went from a fiber glass hood to a steel one. More weight same ET

Fern, I've seen that for over 30 years on GM F and A body cars.

It wont be cheap, but you could talk to somebody about changing the gearing in transmission. A 3 speed with proper gearing will beat a glide any day of the week. Planets are not cheap tho. A 2.10 front gear is going to cost you 2000, and really, it is better to get the front gear down in the 1.80s, but those planets get really expensive.

99.9% of bracket racers won’t spend the coin.

Something to consider. I build all three trans. from time to time for various projects. [Powerglide, 350, & 400]
*The Powerglide is lighter by around 20 + pounds.
*The Powerglide has less rotating drag.
*A properly build Powerglide is basically trouble free.
*The Powerglide is a proven, consistent package.
*It does depend on your combination/setup as to whether or not the Powerglide is faster. However, it is a proven winner.

This is not intended to take away from a 400 trans, just giving my thoughts and experience.

quote:

Originally posted by Larry Woodfin:

*The Powerglide is lighter by around 20 + pounds. I agree but not worth anything on the time slip.

*The Powerglide has less rotating drag. I agree but not worth anything on the time slip

*A properly build Powerglide is basically trouble free. I agree but so is a turbo400

*The Powerglide is a proven, consistent package. I agree but so is a turbo400

*It does depend on your combination/setup as to whether or not the Powerglide is faster. I disagree for the car in question as well the typical back halved, big tire bracket door car.However, it is a proven winner. I agree but so is the turbo400

The OP never stated if/ what the goal (faster, consistent, both) was.

If more consistency is desired and presently th400 with stock (2.48/1.48) planetary, consider installing a 1+2 TB VB and leave in second gear.

.1 loser

I switched from a T400 to a 1.7PG many years ago with a SBC around 3100lbs Chevelle running 10s so not exactly comparable, but with the first pass I thought I broke something! Definitely boring compared to what I was used to.

Car ran same ET +/- .01 but MPH was up 1 MPH for my car. Didn't change rear,tires or converter. Both transmissions were bought from ATI with TB.

Wish I could buy the T400 back for the $750 I sold it for years ago to have fun again.

quote:

Originally posted by 1320racer:
As I have proven recently and in the past on my other cars, removing as much as 40 lbs. shows nothing on the time slip with our cars.

Just to add to 1320s quote above, on a slower car , weight does make a difference. I ran an index before and used weight for hitting the number. I took out 10 pounds and hit the index 000.after being .010 above. The weight always worked for me. You have to place or subtract weight in the right position in the car. Weight over the suspension crossmember or weight in the trunk of a a door car is different than in the front end of a dragster.

Dragster doesn't care as much.