Re: 727--> Powerglide
[Re: DusterKid]
#2511419
06/21/18 05:20 PM
06/21/18 05:20 PM
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Joined: Dec 2005
Posts: 11,526 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,526
Fulton County, PA
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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
Last edited by CMcAllister; 06/21/18 05:21 PM.
If the results don't match the theory, change the theory.
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Re: 727--> Powerglide
[Re: DusterKid]
#2511812
06/22/18 04:40 PM
06/22/18 04:40 PM
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Joined: Dec 2005
Posts: 11,526 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,526
Fulton County, PA
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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.
If the results don't match the theory, change the theory.
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Re: 727--> Powerglide
[Re: CMcAllister]
#2512855
06/25/18 01:24 AM
06/25/18 01:24 AM
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Joined: Jan 2003
Posts: 9,985 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
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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.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 727--> Powerglide
[Re: CRT]
#2512953
06/25/18 11:48 AM
06/25/18 11:48 AM
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Joined: Jan 2003
Posts: 13,354 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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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. 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, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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