Beefing the forward spline. - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 24 (permalink) Old 07-10-2006, 05:27 PM Thread Starter
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Beefing the forward spline.

I have never stripped the splines out on my C4s but I thought that I should do something about this before it happens. I see on here than it has happened to several guys.

I tried this idea of putting a steel bushing around the forward spline. I was not crazy about welding or brazing the kidney holes. Since I am a machininst by trade, it is much easier for me to do machining than welding.

How do you think this will work out? I also got a different kind of thrust bearing than most of you are running. It happens to be the same bearing that Jim at JPT uses in his roller setups.







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<font size=-1>[ This Message was edited by: clevelandstyle on 7/11/06 8:28am ]</font>

<font size=-1>[ This Message was edited by: clevelandstyle on 7/11/06 8:29am ]</font>
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post #2 of 24 (permalink) Old 07-10-2006, 06:13 PM
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Beefing the forward spline.

I wondered about the welding if it affected the strength of the drum with the heat but so far my mig welded ones have been fine. I thought maybe machine out the kidney holes and press in an insert rather than cutting the outside. I would still like to find out how the c6 input shaft works.
I cant see your pics at work will look when i get home.
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post #3 of 24 (permalink) Old 07-24-2006, 05:57 PM
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Beefing the forward spline.

Why did they put those kidney holes in there to begin with?

As for your fix Cleveland is that ring strong enough ya think?
My drum cracked at each kidney hole.



1966 Stang Coupe Org. 6 cyl. 351w,Sealed Power Hypers, ARP bolts,Total Seal rings,Eagle H-beams rods,Balanced,Hedman long tubes, Pro Comp 2.05/1.60 Heads, Shaft roller Rockers, Victor Jr intake, Holley 750 DP, Ed Nix Custom .600/.600 254/258 @.050 Solid Cam, Crane solid roller lifters,Richmond 4.11, Strange mini spool, Modified C4, 3500 stall, Redneck Transbrake, B&M Hammer shifter, Shelby lowered, Pro Comp 6Al system. Mickey Thompson 275/50 Et Street Drag radials.
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post #4 of 24 (permalink) Old 07-24-2006, 07:20 PM Thread Starter
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Beefing the forward spline.

I'm quite sure it's strong enough. It is made from A2 tool steel. The diameter is as big as the piston will allow. I can't foresee any failures. If anyone else can tell me why it would fail, I'm all ears.

The trans is together now. I will be running it next week if all go right.

Grabber Green \'70 Mach I 351C 4V 12.32 at 111mph 1.63 60ft. time
Robin Egg Blue \'79 Fairmont 408C 4V 10.50 at 127mph 1.38 60ft. time
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post #5 of 24 (permalink) Old 07-25-2006, 03:07 AM
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Beefing the forward spline.

So is that ring a press fit then ?? It looks good ? I still have to do the #3 bearing.
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post #6 of 24 (permalink) Old 07-25-2006, 04:14 AM Thread Starter
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Beefing the forward spline.

Yeah. It's pressed.

Grabber Green \'70 Mach I 351C 4V 12.32 at 111mph 1.63 60ft. time
Robin Egg Blue \'79 Fairmont 408C 4V 10.50 at 127mph 1.38 60ft. time
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post #7 of 24 (permalink) Old 07-25-2006, 06:15 AM
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Beefing the forward spline.

I'm sure it will help but wonder if the cavity (kidney hole/s) between the spline and the ring would still create a weak point....meaning the ring would support the O/D but would the void still be a weak point between it and the spline?
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post #8 of 24 (permalink) Old 07-25-2006, 08:25 AM
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Beefing the forward spline.

Seems like a great idea to me, like a girdle to keep the cast iron (splines) from pushing away from the shaft. I'm sure my JPT c-4 has that type of bearing already, was wondering if you had to do any more machining to the drum or if all the machining was done on the ring only? If it would just press on mine, I would be interested in one!

Roger
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post #9 of 24 (permalink) Old 07-25-2006, 02:06 PM
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Beefing the forward spline.

Aren't the kidney holes machined off? The ring is quite thick then to replace what is machined off and is pressed on?
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post #10 of 24 (permalink) Old 07-25-2006, 05:38 PM
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Beefing the forward spline.

Quote:
On 2006-07-10 17:27, clevelandstyle wrote:
How do you think this will work out?
I think that will work awesome. Of course only testing will tell, but I think it looks great.

Troy
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post #11 of 24 (permalink) Old 07-25-2006, 05:59 PM
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Beefing the forward spline.

Quote:
On 2006-07-25 14:06, gregaust wrote:
Aren't the kidney holes machined off? The ring is quite thick then to replace what is machined off and is pressed on?
Ok, I see what he's done now....yes, should be good
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post #12 of 24 (permalink) Old 07-25-2006, 07:27 PM Thread Starter
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Beefing the forward spline.

Yeah, the kidney holes are machined away. The steel piece is thick.

Roger, I did machine a step for the bearing to set so it stays centered(first pic) . I also needed to adjust for the added roller bearing thickness verse the thrust washer. It was really straight forward. Any machinist could do it.

JPT does use these bearings in his C4s. Here is a pic of a JPT built C4 with the bearing mod. It has no beefed kidneys. The trans was in an 8 second dragster.

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<font size=-1>[ This Message was edited by: clevelandstyle on 7/26/06 10:28am ]</font>
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post #13 of 24 (permalink) Old 07-26-2006, 02:46 AM
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Beefing the forward spline.

Just a question on that bearing. What size is the bearing? and does the planet and the outer ring gear hub run on the bearing or just thering gear? I hope that makes sense.
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post #14 of 24 (permalink) Old 07-26-2006, 04:07 AM
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Beefing the forward spline.

I know what your getting at Greg, with ours I took 5 or 10 thou off the front end of the planet so it couldn't contact the forward drum's bearing thrust washer...so the planet's "endplay" is controlled by the rollers front and rear of it. Though are bearing is slightly different to clevelandstyle's, the principle is identical with a machined lip on the forward drum to locate the bearings thrust washer. Our bearing came out of a BW35, don't remember exactly where.... as I could not obtain a semi captured thrust washer off the shelf. I would be interested to know the what the bearing is as well.
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post #15 of 24 (permalink) Old 07-26-2006, 04:17 AM Thread Starter
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Beefing the forward spline.

The "land" of the bearing is about in the middle between the 2 portions of the planets. I'll have to measure it to get you dimensions. I believe it is from a TH400 trans. It's an AC Delco part number and I get it from the GM parts counter along with the common TH350 bearings. I'll have to get back to you on it. All my numbers are in the shop.

Grabber Green \'70 Mach I 351C 4V 12.32 at 111mph 1.63 60ft. time
Robin Egg Blue \'79 Fairmont 408C 4V 10.50 at 127mph 1.38 60ft. time
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