72 Cj5 SBC swap - JeepForum.com

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post #1 of 22 Old 09-06-2012, 12:30 PM Thread Starter
dman1049
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72 Cj5 SBC swap

Im going to run a muncie 4 speed with it mated to a 350 SBC. What clutch and flywheel will I need? I know the engine mounts Ill need. Different Radiator? Probably will do a hydrolic clutch conversion. Drive shafts will probably need modifying. Bell housing as well. Also a T.O bearing. Clutch fork as well. Is there anything I am missing? Will adapting the transfer case to the motor/trans combo be a problem?

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post #2 of 22 Old 09-06-2012, 01:18 PM
CSP
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Find whichever model of Chevy would have had the SBC and Muncie you're using and look up a clutch for that vehicle. It's all Chevy so you'll be using factory Chevy parts from the engine to the transmission.

Adapter to the tcase depends on which Muncie trans you're using. You haven't stated if its a passenger car Muncie or truck version like the SM465.
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post #3 of 22 Old 09-07-2012, 08:30 PM
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Quote:
Originally Posted by dman1049
Im going to run a muncie 4 speed with it mated to a 350 SBC. What clutch and flywheel will I need? I know the engine mounts Ill need. Different Radiator? Probably will do a hydrolic clutch conversion. Drive shafts will probably need modifying. Bell housing as well. Also a T.O bearing. Clutch fork as well. Is there anything I am missing? Will adapting the transfer case to the motor/trans combo be a problem?
The adapters are not cheap. Chevy motor chevy trans nothing to change there or do you not have any of this already?

86 cj7 496 powered 465/205 ton axles 38.5 boggers

http://www.jeepforum.com/forum/f8/my...oject-1019388/
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post #4 of 22 Old 09-07-2012, 09:20 PM
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Considering the shorter wheel base of the 72 I would go as compact as possible SM420 is a little more compact than the SM465 mated up with the model 20 should give you enough room to work with the rear driveshaft. I'm guessing youre going SUA? Raidator has to have the ports in the right spot for the 350. The adapter for the SM420 is about $550 from Novak... little pricey. They have a clutch kit as well. Just depends on how much you wanna spend...

http://www.novak-adapt.com/catalog/kit_422.htm
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post #5 of 22 Old 09-08-2012, 07:03 AM
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youll also have to modifie the firewall if your going to run the HEI. good idea to get a older bell housing so you can drop the clutch and flywheel out the bottom without having to remove the bell housing, might not end up with enough room to remove it, it is a tight fit.
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post #6 of 22 Old 09-09-2012, 12:30 AM Thread Starter
dman1049
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Working on getting these parts. Getting some work done suspension wise then the motor and trans swap. I'm buying all new parts. Probably getting a built muncie from richmand.
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post #7 of 22 Old 09-09-2012, 02:47 AM
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Are you talking about Muncie M20, 21 or 22 car 4 speed? I think the lowest first gear you can get is around 2.54.
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post #8 of 22 Old 09-09-2012, 11:15 AM
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Also test your bellhousing, Not all GM bellhousings will fit with a 168 tooth flywheel, the Pressure plate for a 11" clutch will hit and not let the bellhousing to mate up the with the back of the block. I found out the hard way.
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post #9 of 22 Old 09-09-2012, 02:09 PM Thread Starter
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Probably an m22.
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post #10 of 22 Old 09-09-2012, 03:50 PM
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Quote:
Originally Posted by dman1049 View Post
Probably an m22.
M22's have a close ratio gearset with a 2.20 first gear. Not the best for a Jeep especially if you plan on running larger tires. It'll feel like you're trying to start off in 2nd gear.
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post #11 of 22 Old 09-09-2012, 05:21 PM
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M22's have a close ratio gearset with a 2.20 first gear. Not the best for a Jeep especially if you plan on running larger tires. It'll feel like you're trying to start off in 2nd gear.
I have to correct myself here. M22's are available with both the close ratio(2.20 first gear) and wide ratio (2.54) gear sets. 2.54 is still relatively high (numerically low) for a Jeep, though.

Edit: IMHO, a T-176/177 with a D300 would probably be better. Better ratios, built in top shifter, overall length probably shorter. T-176/177 strength comparable to Muncie. You would have to purchase an adapter plate to mate the T-176 to the Chevy bell housing unless you luck out and find an iron duke bell housing that was used with a T-176.
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post #12 of 22 Old 09-09-2012, 07:31 PM Thread Starter
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I'm adapting it to a 350 plenty of power and I'm going to change the gearing most likely and only going to rock 31-33 inch tires.
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post #13 of 22 Old 09-09-2012, 08:18 PM
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You're not "adapting" a Muncie to any small block Chevy, considering that's the engine family they were found behind.

Adapting means installing parts to work together in a combination that was never found in a factory offering.

You will have to adapt a transfer case to that transmission and good luck finding an adapter to the M20/21/22 family though.
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post #14 of 22 Old 09-09-2012, 08:23 PM
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Quote:
Originally Posted by CSP
You're not "adapting" a Muncie to any small block Chevy, considering that's the engine family they were found behind.

Adapting means installing parts to work together in a combination that was never found in a factory offering.

You will have to adapt a transfer case to that transmission and good luck finding an adapter to the M20/21/22 family though.
They make them but are not cheap. Im a hotrod guy and still i would not use that trans in a 4x4.

86 cj7 496 powered 465/205 ton axles 38.5 boggers

http://www.jeepforum.com/forum/f8/my...oject-1019388/
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post #15 of 22 Old 09-09-2012, 08:47 PM
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This is Advance Adapters GM Muncie to Dana 18/20 adapter kit. Pay attention to the shifter, shifter bracket, shift rods. You'll also need a stick that has a 4" offset to the right so that it'll clear the driver's seat.
http://www.advanceadapters.com/produ...-case-adapter/
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