LSs1Power

iTrader: (5)

Well after the T56 (may it rest in peace) let go... I decided to go with a real tranny. Im also going to change my rear to a Spool with 3.55 gears. Im going to be running 28" tires. The car will be making around 790-840rwhp 700-730rwtq (Mustang Dyno) through an Automatic (Either Power Glide or TH400).

The Power Glide is 30lbs lighter than an aluminum TH400 and you have one less shift to make down the track. I also heard from few guys that the Power Glide is more efficient to put the power down.

The TH400 will have a more aggressive gearing to launch with(which could mean better 60ft's), but im not sure if thats going to make keeping the front of the car down.

If some people are wondering about the power curve... the car makes 700rwtq at 4000-4400RPM and peak in HP between 6000-6500RPM.

The price on both are around the same and both will have a transbrake.

So I would like to hear some opinions from FI folks about which one is better based on their experince and trail and error with both trannies.

98turbls1

iTrader: (17)

Is this going to be a track only or a weekend warrior??

6techniques

iTrader: (7)

Well, it actually comes down to preference and money, as there are guys who run the 400 and swear by it and there are guys who run a PG and swear by it. Nasty-TA, amongst others, runs a PG on the street (rain or shine) and at the track, so for all those who say it cant be done, those guys are being proved wrong! Im going with a 400 for the only reason that it will be cheaper for me.

LSs1Power

iTrader: (5)

Weekend warrior that does alot of track runs. The goal is to go high 8's low 9's.

LSs1Power

iTrader: (5)

An Aluminum TH400 will be around 100 more than a PowerGlide based on what Im getting. So they are around the same price really.

smask04C5

iTrader: (1)

either are fine for the application. I had a S/C 69 camaro small block running a glide with a 5.57 rear gear. 1.80 straight cut low gear set, consistent 8.90's, left on the floor at 7k rpm. consistent 1.14 short times. good luck

6techniques

iTrader: (7)

Thats why I said for me it will be cheaper as I got a killer deal on one!
But if youre doing one from scratch, i agree, they both are in the same price range. What in particluar are you looking at getting???

KissMySSo1

iTrader: (2)

Powerglide all the way. I'm going the same route with a very similar setup.

Alfred

kp

iTrader: (34)

I dont know what you mean by 'aluminum' TH400 but a TH400 with aluminum forward and direct drums will cost about 600.00 more then a PG that will handle the same amount of power.

If its just a race car I would just do the PG right away, I will switch eventually but its not high priority. I have swiched back and forth betwen the two on other cars and there is no huge difference except the lower 1st gear with the TH400 will get a heavier car out faster - but it may also put it on its bumper

Plus having to shift one less time in a faster car is nice, the 1-2 shift comes pretty quick on a fast 3 speed auto car (lots of times when the front end is in the air) so i like the glides a little better overall. Plus getting a dedenbear or ATI case and no blankets and shields to mess with is pretty nice also if you dont mind the cost..

LSs1Power

iTrader: (5)

Hmmm so far it looks like a PG.

A PG has a 1.78 1st and 1.00 2nd while a TH400 have a 2.48 1st, 1.48 2nd and 1.00 3rd. So it looks like the PG 1st gear splits the first 2 gears of a TH400. I guess driveability will be the same with both trannies.

Does it matter with the PG if the race weight is 3750lbs or so?

kp

iTrader: (34)

Personaly I wouldnt put a powerglide in that heavy a car unless it was big block nitrous car or big turbo. Some will argue otherwise but its your decision, either one will 'work.'

They drive a whole lot different, I cant stand driving big stalled PGs on the street in the city. I have had a few high stalled PG street cars, its not terrible but a lot of starts and stops isnt a lot of fun. On the highway it doesnt matter naturally.

If you can find someone that has a glide in a street car (you wont find many) or see if you can have someone give you a ride around the pits in a heavier car with a glide and see what you think. People have all different tolerances for what they will drive around

Montec

iTrader: (3)

too heavy for a PG....

GTFORMULA

iTrader: (94)

I agree. That is pretty heavy for a glide. Shed some weight and youll be good. I am running a glide now. Most cars that run Drag Radial class and 10.5 Outlaw, run glides. If you want to have a dead consistant car that stays on the ground I would choose a glide.

AutoRoc

I don't think weight is the biggest issue. It's whether or not you'll run a gear that suits the 1/4 mile. A Powerglide and a "streetable" gear out back will be a dog more so than a 400 and a streetable gear. A glide needs all the help it can get out of the hole and the rear gear is all the help it will get. Getting the converter perfect is more important also. Being 500rpm off won't be a big deal with a 400, with a glide it may cost a bit of ET, powerband pending basically.

Some people swear by a Pro-Flite/400 at the power levels you're thinking of. Some of them are at the front of their class and I've seen them all on the bumper a few times.

AutoRoc

kp's got a point about N/A, Blown cars. You can't exactly run a tighter converter like a nitrous/turbo car so it might be a bear on the street, especially if you have a loud exhaust. That's all up to you though.

gator's 99TA

iTrader: (2)

i vote the th400. i love mine and love the "big" first gear.

kp

iTrader: (34)

Thats true about the gear, you will have to run pretty much what will max your RPM in the 1/4 to get decent ETs with the glide. With the TH400 you can probably run a 3.50 where you might need a 3.70 with a glide. Doesnt sound like a lot until you make a 2 hour highway trip.

I really think for what you are doing the TH400 would be your best bet.

LSs1Power

iTrader: (5)

First I was thinking TH400 until I started this thread.... In the 1st day of the thread i leaned towards PG and now Im back towards TH400.... Ahhhh choices choices choices...

kp

iTrader: (34)

I would have said PG until you threw that 3750lb thing out there. Thats a lot of weight and converter/gearing is going to be very critical with a glide. TH400 will be much more forgiving and better to cruise around with. If I really thought putting a glide in my car woiuld even pick up a tenth I would have one in there but from my own experience its not worth the trouble at this point. If I was starting fron scratch for the car to what it runs now I would probably have a glide in it but thats at 3400lbs..

LSs1Power

iTrader: (5)

Ok then TH400 it is. Im going to place an order any day now on one. Thanks everyone