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Power glide adapter

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sandboxer
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Power glide adapter

Post #1 by sandboxer » Fri Mar 22, 2019 4:32 pm

Hello to anyone that can help. I found a flex plate for a ford small block to mate to a power glide. Will this work for the 300?
Thanks

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MechRick
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Re: Power glide adapter

Post #2 by MechRick » Fri Mar 22, 2019 4:47 pm

The crank patterns are the same, but it might have a balance weight on it.
If so, knocking the weight off and neutral balancing it should do the trick.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

sandboxer
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Re: Power glide adapter

Post #3 by sandboxer » Fri Mar 22, 2019 7:03 pm

Thank you!

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xctasy
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Re: Power glide adapter

Post #4 by xctasy » Fri Mar 22, 2019 7:26 pm

What MechRick says. Our beloved Oz 4.0 OHC Turbo into 2-door 62 Fairlane man works for Hughes Industries. The PowerGlides were the birth of many great other TurboHighlyDramatic transmissions.The shear grunt of the better Supercharged SBF and big bkock Ford "Mountain Motors" have been a staple diet of Ford drag racers for an age, a swap for GM ers using 9 " axles and TopLoader gearboxes and Bishops Kirby power steering boxes off Mustangs. Its like a Contra Arms->Iran deal, only nobody has to scread paper, or take the 5th. There is a common adaptor for the GM Glide gearbox, or a special bolt on SGI rated bellhousing for SBF's. The flex plate might have a rivited on 28 oz bob weight or cut away section to suit a 289 or 351C or early years 400. Normally it is droped down to a 153 teeth Chevy THM 350 size...which was actually a Flat Head 239V8 or Lincoln V12 flexplate size
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THE FRENCHTOWN FLYER
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Re: Power glide adapter

Post #5 by THE FRENCHTOWN FLYER » Fri Mar 22, 2019 9:16 pm

sandboxer wrote:...I found a flex plate for a ford small block to mate to a power glide. Will this work for the 300?
Thanks

There are several key points to consider:

- O.D. and tooth count on the ring gear
- Bolt pattern of the powerglide torque converter
- flex plate (im)balance

There are two ring gear diameters - 157 tooth and 164 tooth. All 300s came with 164 tooth ring gears. SOME small block flywheels - notably those for trucks - came with 164 tooth ring gears. MOST small block flywheels for passenger cars used the 157 tooth ring gear size flex plate. You need a small block 164 tooth flex plate that has been neutral balanced.

Some flex plates have a wavy surface where the torque converter pattern bolts up; you need one that is flat in that area of the converter bolts.

Merely removing the balancing weight from a flex plate [externally] balanced for a small block DOES NOT NECESSARILY MAKE IT A NEUTRAL (ZERO) BALANCED flex plate. Sometimes a smaller weight is used along with a series of holes punched in the flex plate opposite the balance weight.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

sandboxer
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Re: Power glide adapter

Post #6 by sandboxer » Sat Mar 23, 2019 8:47 am

Thanks FF
It’s a neutral balanced 164 tooth plate. New and never been used. Good to go!
Is there anything else I need to know:)....
Did you make your bell housing adapter?

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THE FRENCHTOWN FLYER
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Re: Power glide adapter

Post #7 by THE FRENCHTOWN FLYER » Sat Mar 23, 2019 10:49 am

Yes, I make my own bellhousing adapters. I have the coordinates for both the Ford bolt hole locations and dowel centers and the Chevy bolt hole locations and dowel centers. I think the locations should be spotted in within .010" tolerance. The dowel pins fortunately are far enough apart so as to not interfere with each other. Ford uses .500" pins; Chevy uses .750" pins. I bore and ream both locations to .500" and turn the Chevy .75" pins with a .500" projection on the ends which get Loctited and pressed into the bell side of the plate. I use .25" aluminum plate 6061 T6 for the adapter plate that also incorporates mid plate motor mounting tabs, along with the correct hole location for the starter pocket. Some of the Ford 7/16 bolts need to be of the countersunk style so the PG bell sits flush to the plate. On one bolt location on the driver's side (LH) the Ford and Chevy holes overlap. Not wanting to forgo any attachment point for the trans I make a litte cantilever mounting T-lever which clamps the PG down in that location.

Then there's the crank hub adapter. Commercial adapters are available now but early PG adaptations were made by machining off the hub end of a scrap Ford crankshaft. I won't get into all the permutations and combinations of dimensional variances necessary to consider - flex plate thickness vs hub dimensions vs pilot hub protrusion vs torque converter mounting locations, etc. here. Rather I will refer you to the Coan Transmissions website. Those folks have great online spec sheets you can use to help you get everything dialed in to the specific torque converter you will be using.

http://www.coanracing.com/ in Kokomo Indiana, I believe.

A word about PG transmissions - The once-lowly 2-speed GM "slush box" has become the preeminent racing transmission of choice in several different racing genres. Like its driveline cousin, the 9" Ford rear end, they are so well suited that they are the component of choice for the majority of competitors. And like the Ford Niner there is a wide array of aftermarket products and support available for it, including complete aftermarket look-alike units capable of supporting well over 1000 HP.

I'm travelling during these winter months so I don't think I have my X-Y coordinates for a plate with me. I know I have them in my home library and can post them when I return.
Good luck with your project. What type of vehicle will it be going in? Post pics.
Last edited by THE FRENCHTOWN FLYER on Sat Mar 23, 2019 11:12 am, edited 1 time in total.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

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Re: Power glide adapter

Post #8 by pmuller9 » Sat Mar 23, 2019 11:08 am

The Chevy bolts are 3/8", the Ford are 7/16".
The Ford dowels are typically .501-.502", the Chevy are .623-.624"

Chevy
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Ford
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THE FRENCHTOWN FLYER
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Re: Power glide adapter

Post #9 by THE FRENCHTOWN FLYER » Sat Mar 23, 2019 11:16 am

OOPs - The Chevy pins are 5/8, not 3/4. Drill and tap the plate to install 3/8 studs for the PG. I flush grind the end of each stud to pick up every last scintilla of thread engagement to the plate, and use permanent Loctite to install them. pmuller9, Do you happen to have the starter motor X-Ys and pilot dia. handy? Unlike the Chevy, that hole precisely locates the starter motor and determines the gear backlash to the ring gear.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

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Re: Power glide adapter

Post #10 by THE FRENCHTOWN FLYER » Sat Mar 23, 2019 11:29 am

Found it

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Re: Power glide adapter

Post #11 by pmuller9 » Sat Mar 23, 2019 11:52 am

FTF
I don't have the starter motor X-Ys and pilot dia.
We were making our own rear engine mount plates between the SBF engine and Chevy tranny.
We added the starter mount holes on the combined drawing which I don't have for some reason.

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Re: Power glide adapter

Post #12 by sandboxer » Sun Mar 24, 2019 1:31 am

Wow and thanks to both of you. That just blew my mind.
I have a project that I will post photos of soon. I’ve been busy with regular things that prevent continuity, but I plan on a push soon.

I bought 7 3-speed top loaders, 5 of which came from an automotive school program that shut down. These came directly from Ford in 1965 (28 spline output shaft) and had never been in a vehicle.

I want to use these (one is already mocked up in the project and crossmembered) but I have something for powerglides...

Thanks for your expert help.

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Re: Power glide adapter

Post #13 by Lunatic Fringe » Sun Mar 24, 2019 2:04 am

Sandboxer, I think I have a SBF crank adapter. I'll have to do some digging for it, been awhile since I've looked at it. Trying to remember if I still have an adapter plate as well. 1/2" aluminum.

Should have the X,Y and starter pilot hole size as well for both 157 and 164 tooth flex plates.

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Re: Power glide adapter

Post #14 by sandboxer » Sun Mar 24, 2019 11:30 am

Thanks Luntaic Fringe
I’d like to come up for a visit!

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Re: Power glide adapter

Post #15 by Lunatic Fringe » Sun Mar 24, 2019 1:26 pm

We will arrange that soon. If I get out to the garage today, I'll post some pictures.I had CNC'd 2 motor plates, 1 for a 157 ,1 for a 164. I put the 157 in the puller as it's slightly narrower as I need all the room I can get.

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Re: Power glide adapter

Post #16 by Lunatic Fringe » Sun Mar 24, 2019 5:16 pm

Ok, found the crank adapter and the block plate. you can get a better look at them when we get together. Couldn't find the trans adapter, I'll look some more later.
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