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#1 |
Registered User
Join Date: Jun 2018
Location: North Beach, MD
Posts: 2
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Vortec 7400/Muncie help
I have a line on a big block for a good price. Will the Muncie in my truck bolt up to it, and what do I need to do it? It came out of a 98 suburban. The truck is a 70 lwb rwd that currently has a 350 in it. I really want to keep the trans.
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#2 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Vortec 7400/Muncie help
I would think just getting the correct flywheel would be all that it took. 168 tooth for a 7.4l externally balanced with correct bolt pattern for your year. Everything else should be useable. You might be able to run the big block on the small block mounts which keeps the trans in same spot. You will need to build a custom z bar (crossshaft).
If you go to big block mounts, you need those for the manual trans bellhousing as well since they are moved up and to the front. They are not so common... Also need clutch pushrod from pedal and appropriate cross shaft.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#3 |
Registered User
Join Date: Jun 2018
Location: North Beach, MD
Posts: 2
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Re: Vortec 7400/Muncie help
Thank you. That's the first I've heard of using the small block mounts, that would make my life considerably easier. A new crossshaft should be pretty simple to fab up.
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#4 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,949
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Re: Vortec 7400/Muncie help
Maybe a set of square body engine stands/mounts would do the trick also. They are easier to find.
__________________
ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#5 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Vortec 7400/Muncie help
The challenge with the big block swap on the manual trans is that the bellhousing mount crossmember has to move forward if you use different mounts. Because the frame curves up right there, the crossmember is a different size/shape that the bellhousing bolts to. And most of the clutch linkage pieces are different.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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Tags |
bbc, bell housing, flywheel, muncie, vortec |
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