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10-04-2018, 09:38 AM
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Simple? What's simple?
 
Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
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3OTT question, Standard vs. H.D.?
I'm getting ready to swap a 3 speed (column shoft, I know!) into a factory 350 '72. I've been digging into the order guides a bit, and there are references in some places to a "3-speed H.D." for 350 and 400 powered trucks, but the ratios are the same.
Does anyone know what, if any, difference there is? It seems like possibly it references the SM330, which has the fifth mounting ear (though the bell housing for that didn't appear until '73 or '74). Search hasn't turned up anything useful, nor has Google. Any thoughts? Thanks!
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CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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