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Author Topic:   Which is the best C4?
65_289
Gearhead

Posts: 701
From:
Registered: Jul 2001

posted 07-30-2002 12:58 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
Case fill or pan fill? Big bell or small bell? I assume the 26 spline input shaft is better than the 24 spline, right? Are there any issues that go with having one versus the other? Like the starter, or header clearance?

These damn things have so many variations, it's hard to know what's what!!

[This message has been edited by 65_289 (edited 07-30-2002).]

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 07-30-2002 03:03 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
If it is a custom built trans it really does not make much differance. The builders replace the weak internals with the good stuff. All performance C-4's should use 26 spline inputs and pumps.
I like small bell case fill units because they are more compact, lighter and have more clearance for things like headers, dip stick tubes, and fire walls.

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Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

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Rustang
Gearhead

Posts: 403
From: Clarion PA
Registered: Nov 2000

posted 07-30-2002 06:03 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
One thing I discovered with the big bell/pan fill C-4 is the small bell bolts right on with the small B.C. converter! It looks a little funky with the extra bolt circle on the trans housing hanging bare but it works.

I forget why now, but the pan fill is supposed to be stronger.

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'68 mustang 351 clevor- [email protected]
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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 07-30-2002 06:52 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Yes, some of the experts claim that the pan fill or C-5 cases are stronger, but I have NEVER broken a case fill C-4 case on MM.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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Keith
Journeyman

Posts: 22
From: Sumner, Wa 98390
Registered: Jul 2002

posted 07-30-2002 08:05 PM     Click Here to See the Profile for Keith   Click Here to Email Keith     Edit/Delete Message   Reply w/Quote
I know on my Fairlane, with the Hooker super comp headers, the large bell housing is a p.i.t.a. to get in and out. I have to pull my headers off, and if you've seen them installed you understand. If I only had a small B.H., I could probably get away with not pulling the headers. If I had the choice now, I would run a small bell housing case fill C4.

Learn from my mistakes!!!
please??

Keith

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Kyle
Gearhead

Posts: 210
From: Sumner, WA
Registered: Dec 2001

posted 07-31-2002 01:11 AM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
Hey Keith, don't forget the bigger P.I.T.A. it was to get a dipstick to fit into the pan AND clear the headers! Used a Lokar dipstick and had to cut down the tube, bend it to clear the tranny, and re-flange it as best I could. If you're using tube headers, a case fill will probably be easier from the dipstick clearance point of view.

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Kyle Laramore

63 Fairlane: 302, Victor Jr. heads and intake, solid lift cam, super comp headers, MSD 6al and duraspark, 650 DP carb, C4 w/ Hughes converter, man. valve body

66 Mustang coupe: 289, offy intake, Holley 600 vac. sec., 3spd stick

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 07-31-2002 07:21 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
It wasn't that the pan fill was stronger, or so I believe, it was the bell bolting to the case reduced the torquing/binding action/reaction on the pump in heavier duty vehicles. And yes, the pan fill usually had more clutches.

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Keith
Journeyman

Posts: 22
From: Sumner, Wa 98390
Registered: Jul 2002

posted 07-31-2002 07:28 PM     Click Here to See the Profile for Keith   Click Here to Email Keith     Edit/Delete Message   Reply w/Quote
Yes Kyle, I remembered that!

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