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Old 03-08-2011, 06:12 PM
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Need Chevy bellhousing advice

I was given a Chevy bellhousing code #460486. This is an aluminum truck bell, 12", big hole. My first question is whether this is an acceptable bell to use on my 350 with a Muncie 4-speed behind it. The engine is built but not installed yet; maybe 350 HP depending on whether I put some decent heads on it to replace the ones on it now.
Second question: can I put a 10.5" or 11" clutch in this bell because it is a 12"?
Greatly appreciate the help guys.

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Old 03-08-2011, 06:37 PM
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You can't use the Muncie 4-speed on this bell if the register hole in the bell is bigger than the input bearing retainer OD on the trans.

This tight fit of the retainer OD and bellhousing hole ID is what aligns the trans with the centerline of the crank. The bolt pattern on the trans is not sufficient for alignment, and misalignment of .005" is enough to cause hard shifting and other problems. Misalignment larger than that can cause bigger problems.

Any size clutch will fit in the bigger bell.
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Old 03-08-2011, 06:42 PM
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The register hole on the truck bellhousing is 5 inch, You need a 4.5 inch. A adapter ring is avalable at a resonable cost.
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Old 03-08-2011, 06:56 PM
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http://www.dennymac.com/mod.php?mod=...103&page_id=54
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Old 03-09-2011, 04:45 AM
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Thank you for the info

That's what I needed to know. I appreciate the advice. I wonder if someone will ever give me anything that will work for my 48 Chevy Sedan Delivery street rod project. Oh well, I'll keep looking and know a lot more now about what I need.
Thank you.
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Old 03-09-2011, 05:58 AM
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I had forgotten about the guy making adapter rings, that would be one way to enable you to use the bell you have now. Simple idea really.
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Old 03-09-2011, 08:51 AM
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The Chevy small flywheel bellhousings are easy to find. The car big flywheel bellhousings are hard to find. The truck bellhousings are easy to find until you realize the register hole is too big for a Muncie, T10 or Saginaw 4 speed.
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Old 03-09-2011, 11:58 AM
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The following is a list of some of the bells. It may help someone:

FROM: '55-'82, Corvette By The Numbers, A. Colvin

Quote:
Bellhousing Casting Numbers

3704922
'55-'56
Cast Iron
10.5" clutch
168 tooth flywheel
(1st. SBC bell housing)

3733365
Late '56-'59
Cast Iron
10.5" clutch
168 tooth flywheel
(2nd and last iron SBC bell housing, identical to 3704922)

3764591
'60 Only
Aluminum
10.5" clutch
168 tooth flywheel
(1st. SBC aluminum bell housing. Same size clutch fork boot as 37333365)

3779553
'61-'62
Aluminum
10.5" clutch
168 tooth flywheel
(Identical to 3764591 except with larger clutch fork opening)

3779553
'61-'62
Aluminum
10.5" clutch
168 tooth flywheel
(Identical to 3764591 except with larger clutch fork opening)

3788421
'63 Only
Aluminum
10.5" clutch
153 tooth flywheel
(Identical to 3858403 except with smaller trans bearing hole)

3858403
'64-'72 SB
Aluminum
10.5" clutch
153 tooth flywheel
(Identical to 3788421 except with a larger trans bearing hole)

3872444
Early '65-'66 BB
Aluminum
11" clutch
168 tooth flywheel
(Identical to 3788421 except with a larger trans bearing hole)

3858403
'64-'72 SB
Aluminum
10.5" clutch
153 tooth flywheel
(Identical to 3899621)

3899621
'66-'74 BB
'73-82 SB
Aluminum
11" clutch
168 tooth flywheel
(Identical to 3872444)
There was at least one more that's supposed to fit the 153 T flywheel and 10.5 clutch: 3840383. I would double check these numbers, I have not verified them.

Regarding the adaptor rings, McLeod makes one but supposedly machining is required.

I had bookmarked the following, it may lead to something:

Quote:
Somebody is now making bearing retainers for Muncie trans for the truck bellhousing---Cannot recall who---Will have to go to
Team Chevelle----- http://www.chevelles.com/forums/index.php
or
Chevy Talk-------- http://www.chevytalk.org/fusionbb/index.php?

Find posts or threads by: DZAuto
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Old 03-09-2011, 12:57 PM
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I have one of the rings made my McLeod
did have to machine the bearing retainer .1"x.1" on the trans side of the retainer to hold the ring in place.

Some can be held in place on the trans with an oversize washer on the bearing retainer.

some are retained with set screws.

I have an 87 Chev truck bell (hydraulic clutch) in my 59 with a TKO trans and see no problems using the truck bell-----I will do it again in the future if I have troubles finding a 621 bell, or if I want to go hydraulic on another car.
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Old 03-09-2011, 01:33 PM
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granade

Quote:
Originally Posted by bear lake rodder
I was given a Chevy bellhousing code #460486. This is an aluminum truck bell, 12", big hole. My first question is whether this is an acceptable bell to use on my 350 with a Muncie 4-speed behind it. The engine is built but not installed yet; maybe 350 HP depending on whether I put some decent heads on it to replace the ones on it now.
Second question: can I put a 10.5" or 11" clutch in this bell because it is a 12"?
Greatly appreciate the help guys.
Sticks are a blast to drive but you might want to consider a scatter shield? My friend exploded a pressure plate it broke his block, starter, header, ripped a hole in the floor and a 1lb. chunk of hot shrapnel knocked his foot off the gas and bent the gas pedal. OUCH! Someone in town (69 chevelle 375/396) lost his brakes and steering when he blew his up and pitched a chunk through a old couples living room. The cops were not called though as they were right behind him. That had to suck.

Last edited by RACER RICK original; 03-09-2011 at 01:38 PM. Reason: dont know what im doing
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Old 03-09-2011, 01:39 PM
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Scattershield

I have considered a scatter shield, but I have also looked at bellhousings that are SCI certified (titanium/aluminum alloy) from Pace Performance Products ($290). I have not priced scattershields. What do you think about the SCI certified bells?
Thank you for all of the great input!
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Old 03-09-2011, 01:45 PM
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Keep in mind that at only 6000 RPM the fly wheel is spinning about 200 MPH.
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Old 03-09-2011, 01:48 PM
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Dont know about them but if the are NHRA approved they should be a good unit.
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Old 03-09-2011, 02:28 PM
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Are those adapter rings made out of aluminum? Can't a aluminum ring be welded to the bellhousing?
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Old 03-09-2011, 03:10 PM
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Done right, welding would work fine but the labor involved might make it less desirable to do for the average hotrodder.

The risk would be that the location of the center of the bell-to-trans mounting hole might be munged by the heat. This might be corrected by using offset dowels, but prolly the easiest thing is to not weld in the first place.
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