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#2511403 - 06/21/18 02:57 PM 727--> Powerglide
DusterKid Offline
super stock

Registered: 01/02/05
Posts: 888
Loc: Keymar, MD
For you guys that have switched from a 727 to a powerglide how did it affect your car? Slow down 60', pick up mph, run same et?

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#2511419 - 06/21/18 03:20 PM Re: 727--> Powerglide [Re: DusterKid]
CMcAllister Offline
master

Registered: 12/30/05
Posts: 2622
Loc: Fulton County, PA
Based on most of the things I see, a Glide is over twice as efficient (less power to operate) than a standard, non-roller 727. And only slightly more efficient than a 904. But it's also lighter. That equates to power reaching the tires and MPH.

The big factor is the low gear ratio. The importance of finding that sweet spot of "not too much, not too little" is overlooked by many people. Whether it will help and by how much depends on your situation.

Typically though, going from a 727 to a 904 with basically the same low gear, which I have done, is worth a tenth or tenth and a half. Going from a 904 to a Glide, it didn't really pick up much. But the consistency and how the car worked in the first 60' was way better, AFTER we got the right low gear in it. It was a turd with the 1.76


Edited by CMcAllister (06/21/18 03:21 PM)

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#2511715 - 06/22/18 10:55 AM Re: 727--> Powerglide [Re: DusterKid]
sg1093 Offline
enthusiast

Registered: 02/08/03
Posts: 235
Loc: Pottstown, Pa.
My thoughts exactly. I had a small block 70 Dart, and I think the lack of torque was why it wasn't as fast with the powerglide. Went from a 727 to a powerglide with a 1.82 first gear. wasn't faster or more consistant, because it wasn't hitting the tires as hard. 360 ci engine at 3000 lbs, was running NHRA Super Street.

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#2511812 - 06/22/18 02:40 PM Re: 727--> Powerglide [Re: DusterKid]
CMcAllister Offline
master

Registered: 12/30/05
Posts: 2622
Loc: Fulton County, PA
Yep. I went from quick IF the track was there, to turd like driving away from a stoplight to quick and consistent. All with the same power, just different SLRs.

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#2512446 - 06/24/18 12:45 AM Re: 727--> Powerglide [Re: CMcAllister]
CRT Offline
master

Registered: 01/20/03
Posts: 2733
Loc: Cedar Lake IN
You can make a 727 or 904 a two speed with a CRT 2nd gear launch trans brake valve body for a lot less then converting to a pg.
_________________________



Cope Racing Transmissions

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#2512747 - 06/24/18 07:05 PM Re: 727--> Powerglide [Re: DusterKid]
dizuster Offline
master

Registered: 01/12/05
Posts: 3388
Loc: Oakland, MI
If the 1.82 or 1.76 isn't enough for most people, I'm guessing the 1.45 would be a struggle.

I get the really big powered stuff can use less SLR, but leaving in 2nd on a 727 would be REAL soft for most stuff.
_________________________

Owner of the ugliest turbo car on the planet. 9.55-141.8mph @3740lbs on 275's

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#2512855 - 06/24/18 11:24 PM Re: 727--> Powerglide [Re: CMcAllister]
gregsdart Offline
master

Registered: 01/21/03
Posts: 8463
Loc: Frostbitefalls (Rocky&Bullwink...
Originally Posted By CMcAllister
Based on most of the things I see, a Glide is over twice as efficient (less power to operate) than a standard, non-roller 727. And only slightly more efficient than a 904. But it's also lighter. That equates to power reaching the tires and MPH.

The big factor is the low gear ratio. The importance of finding that sweet spot of "not too much, not too little" is overlooked by many people. Whether it will help and by how much depends on your situation.

Typically though, going from a 727 to a 904 with basically the same low gear, which I have done, is worth a tenth or tenth and a half. Going from a 904 to a Glide, it didn't really pick up much. But the consistency and how the car worked in the first 60' was way better, AFTER we got the right low gear in it. It was a turd with the 1.76

Finally, an explanation that makes sense.
_________________________
GREG
Educated at SHK U
Measure with yardstick
mark with chalk
cut with torch!



528 cubic inch alky injected 440-1 wedge, 3055 race weight.
8.779 at 153.16 mph. 1.289 60 ft. density altitude 1617 feet. Best 60 ft 1.24

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#2512929 - 06/25/18 08:27 AM Re: 727--> Powerglide [Re: CMcAllister]
mercman1 Offline
mopar

Registered: 03/21/05
Posts: 496
Loc: Stuart FL
I switched my Hemi GTX from a glide to a 727. I weighed every part Trans, converters flex plates ,drive shafts and don't forget adapter hub. The Glide was 30 lbs lighter, but by the time you put in the longer driveshaft, heavier converter and hub assembly it was a wash. been there!

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#2512953 - 06/25/18 09:48 AM Re: 727--> Powerglide [Re: CRT]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10975
Loc: Marion, South Carolina [><]
Originally Posted By CRT
You can make a 727 or 904 a two speed with a CRT 2nd gear launch trans brake valve body for a lot less then converting to a pg.

iagree This is exactly what I intend to do soon. The 1.45 gear will be soft for something not making a lot of power though.
For what a bulletproof glide will cost me for my car, I'll try one of Cope's transbrakes first.
_________________________
CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler

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#2513074 - 06/25/18 01:55 PM Re: 727--> Powerglide [Re: an8sec70cuda]
b1dartsport Offline
super stock

Registered: 02/14/05
Posts: 936
Loc: western pennsylvania
Put a 999 low 277 gear set in the 904 and second gear is 1.54.

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