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dell72 · 12-18-2015, 02:50 PM

I would think the T-400 would be appropriate in an HD towing application where you be more concerned with transmission withstanding extreme heat and towing weight versus a traditional horsepower rating.

I have no actual facts to support my statement, purely speculation. I do recall a former co-worker owning a 69 GMC 2500 that featured a 350/T-400 combo that was claimed to be OEM.

12-18-2015, 02:50 PM	#3
dell72 Registered User Join Date: Jul 2013 Location: Southern Wisconsin Posts: 126	Re: TH400 behind a 350 OEM, when and why? I would think the T-400 would be appropriate in an HD towing application where you be more concerned with transmission withstanding extreme heat and towing weight versus a traditional horsepower rating. I have no actual facts to support my statement, purely speculation. I do recall a former co-worker owning a 69 GMC 2500 that featured a 350/T-400 combo that was claimed to be OEM.