904 or Powerglide???

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Luiz Greca

Luiz Greca

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Hi buddies!

My car is almost ready, and I need to know your opinions !

My setup is a very light Dart (2400lbs), with a 360LA, 14:1(methanol :snakeman:), edelbrock ported heads, victor ported intake, 1-7/8 ceramic coated headers, 900cfm EFI, roller rockers 1.6, solid roller cam (576/[email protected] 110lobe 286int./292exh.), lunatti solid rollers lifters, cam gear drive, KB forged 4" pistons, Eagle H rods, Scat crank, Milodon Deep Pan, 4,27 gears with spool, Weld wheels, MT 29,5X11,5X15 slicks.
Now I have a mec 4 speed on it, but I need to go auto with transbrake.
Due my car's weight I been thinking of goin with PG or a 904 trans, and I'm very attracted to the PG, because it eats only 10hp BUT 2 speeds...!
So I want to know your opinions on which is better!
Thanks!
 
pg eats 18 hp
904 eats 24 hp

per car craft magazine many years ago...

your 4.27 gears in not enough for a PG...
converter selection for a pg is extremely critical ...
 
What converter do you have or what are you considering?
An how did you get your dart that LIGHT!!!?
 
Beefed up 904 or 727...I don't think you would like a glide with that combo.
 
WHAT ARE YOU RUNNING 1/8MI. OR 1/4 . I RUN ONLY 1/8 BECAUSE IT'S EASIER ON CAR . MY BEST FRIEND HAS A 69 DART RUNS A STROKER 360 ABOUT 41O CUBE. . MINE IS A 20 OVER 360, hIS IS A P/G. MINE IS A 904.WE BOTH RUN 488 GEARS MY 60 FT TIMES ARE 1.42 TO 1.52 HIS ARE 1.7 T0 1.9 the only time I lose to him is when I give him at least a .5 sec. head start witch is only 1 time in 9 matches. his trap times are a little faster but I get there first. you need to stay all mopar . that is good. go mopar Gary.
 
If you can swing it I'd go with the 'glide. Converter selection is critical. That gear may be OK depending on the trap speed. With that small of a tire and that light of a car the 'glide will be a better choice. It will launch and hook much more consistently. The 3 speed (904 only, forget the 727 altogether as it's too big and too heavy) would be a better choice for a car weighing over about 3000 pounds.

The best way to accomplish the swap is with a LA small block to PG Ultrabell from JW transmissions in Cocoa Florida.
 
I also vote 904 on a trans brake. I don't know a whole lot about a PG but I'm a big fan of keeping it all MOPAR! A 904 can be built and I wouldn't mind dropping my 727 and building one of the 904's I have. I've read a lil about putting 904 internals in a 727 case, apparently the 727 case is a lot stronger, just a thought. Ler us know what that monster Mopar runs, sounds like it'll be damn fast
 
How many of you guys have actually driven a real race car with a glide? I've driven at least 4 of them capable of ET's from mid 8's to very low 10's and they all left hard with the wheels in the air. The advantage comes from not having the huge torque multiplication of the low gear in a 3 speed which you really only need for a heavier car. Without it the car is much less likely to spin the tires netting you better consistency and that is the name of the game in most any drag racing with the exception of the pro classes, but even still it has a place there too.
 
Hi Buddies!

I have a saying: I don't know, so before go wrong: Ask to know ! And you are helping me a lot! Thank you!


My Dart has about 2200 lbs! Aluminum interior, front fenders, doors, trunk, and bumpers in a very light fiberglass, 4.27 gears w/ spool, on MT 29.5X11.5-15.
My plan is use the car only on the track in 1/4 mile.
I am thinking about a 4200 stall converter for 904 or 5000 for a PG, - Whatever the choice will reversed pattern with transbrake.

But most important is to let the Chevys and Fords eating dust :bootysha: !!!!!!

Luiz
 
based on your combo id vote for a glide....they are popular in applications like yours, and for good reason....there comes a time where using different brand stuff is okay in my book anyways- like rearends and trannys....however, using a brand x motor is definatly sacrilidge that requires burning at the stake lol...good luck man, your car sounds like it will be a ride and a half....by the way, where are you from?
 
Guitar Jones said:
How many of you guys have actually driven a real race car with a glide? I've driven at least 4 of them capable of ET's from mid 8's to very low 10's and they all left hard with the wheels in the air. The advantage comes from not having the huge torque multiplication of the low gear in a 3 speed which you really only need for a heavier car. Without it the car is much less likely to spin the tires netting you better consistency and that is the name of the game in most any drag racing with the exception of the pro classes, but even still it has a place there too.
Click to expand...

I agree if in fact your car is that light? I'm suspect as my SG 67 tube frame Barracuda weighed 2315 without the driver. When I ran it with a 727 it launched way to hard on the rear valance bending wheelie bars. I went with a 1.80 glide and a 4200 converter with a brake and the car was a pleasure to drive. Hooked hard, 1.26-1.28 60 ft and came out of the hole straight as an arrow and carried the front tires about 8".
 
520HP isn´t a very little power for use a PG? How many seconds do you think should make the 1/4?

Again I thank all friends of "For A Bodies Only" for help. Here where I live is a very few people who have this knowledge and willingness to help!
Thanks!
 
At that weight 520 hp is plenty to get you deep into the 10's with a glide. Possibly high 9's with really good air. Good luck.
 
I agree. under 2500lbs a glide will be faster. But I also think the convertor and gear will need to be addressed. If this is serious, have the engine dyno'd first. Then order the trans, the gears, and the convertor. I would think you would be better with somewhere around a 5500 stall and 4.56s or 4.88s but the dyno will tell you where the torque and HP peaks are and what they look like.
 
Personally I would consult the torque converter manufacturer for recommendations on the converter. If you go with a reputable company like Coen, Turbo Action, Dynamic, ATI or A1 they'll know what would be best. If like Moper said you have the dyno information that would be even better but they can get close with basic info like head flow/manufaturer, intake, camshaft and so forth.
 
Yes, are completely right, the first thing to do is put the engine in a dynos, and find the real peaks of hp and torque.
 
http://www.youtube.com/watch?v=cLPbah_LRVs


Heres mine.408 10 to 1 ,with a mild hydraulic cam .It has a PG with a 3,000 stall and a trans brake.I dont use the brake (cuz the 8.5 slicks wont hold it) ,i launch on the foot brake at about 2400 and shift at 5800.I have 4.10 gears and no traction bars with stock springs.I have ran a best of 7.58 in the 1/8 @ 91 mph ,with a 1.65 60 ft.The car ran 11.81 @ 113 mph in the 1/4.I would say to use the glide ...
 
I have been seeing a trend of rear engine dragsters going back to torqueflites. Seems cool to me. I run a 727 behind my 2700 lb 410 but I hope to have a cope 904 with a Dynamic converter by next spring. We are headed for the 10s at 3500 feet. All this with an old thermoquad!
 
i run a 3550 lb indy headed 410 and a stock 904 with fmvb runs 10.9 asp and chucking 200 nos at it as well will the 904 hold up or should i go glide as well
this is her leaving asp ,904 and 3.9 rear 26/10 and 1.5 sixty foot

HP Heaven-Heathcote_Park_Test_and_Tune-LA1_7346.jpg
 
Ian, I was wondering where you were from then I noticed you were driving from the wrong side of the car and then I noticed the url in your pic. It's a cool car even if it's a 4 door. I realize it isn't the same for you guys down under though. You usually don't see 4 door race cars here. Basically because they are just heavier and no one built them.
 
thanks mate ,yes we love the 4 doors over here, we like our family race cars
what tips for the 904 mate ,just rebuilt the 9 inch diff with a strange carrier,yoak ,full spool ,3 1/2 inch tail shaft etc the 904 is stranded with fmvb and low gear set ,what other mods does she need , trying to run a nine @ 135 in a heavy car 700 hp dont wont to brake trans. ian
 
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