'83 High Sierra 2500 transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**MS66** · 07-30-2025, 12:10 AM

Can someone help me put an ID to the 4 speed in a parts truck I just picked up? I heard that it's not necessarily a Muncie SM465 in it. Haven't crawled under it to get a closer look. No VIN, or SPID in it. came with a 305/4spd. w/hydro clutch, semi floating 14 bolt rear. Thanks for any help.

EDIT: So I got a late night burst of energy since the temps dropped below 90 degrees here. Looks like a Muncie SM465 to me. I didn't realize '83s had juice clutches. I have no experience with them, is that good or bad?

07-30-2025, 12:10 AM	#1
MS66 Senior Member Join Date: Jul 2011 Location: Florence, MS. Posts: 246	'83 High Sierra 2500 transmission Can someone help me put an ID to the 4 speed in a parts truck I just picked up? I heard that it's not necessarily a Muncie SM465 in it. Haven't crawled under it to get a closer look. No VIN, or SPID in it. came with a 305/4spd. w/hydro clutch, semi floating 14 bolt rear. Thanks for any help. EDIT: So I got a late night burst of energy since the temps dropped below 90 degrees here. Looks like a Muncie SM465 to me. I didn't realize '83s had juice clutches. I have no experience with them, is that good or bad? Attached Images Last edited by MS66; 07-30-2025 at 01:11 AM. Reason: spooked it out myself



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