TH350 - Performance Automatic? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72malibu** · 10-04-2020, 02:23 PM

Hello, helping my dad swap out a Muncie in his Gentleman Jim for a TH350, as it came from the factory. It'll be easier for him to drive an auto these days.

I'm physically close to Performance Automatic in Frederick MD. Anybody have anything positive or negative to say about their Stage 1 TH350? It'll be going behind the original 350 with a mild cam/manifold and headers.

Also, these square body trucks had a 9 inch tailshaft, right?

LT7A · 10-04-2020, 10:51 PM

I don't know anything about that transmisson builder but even a stock rebuilt TH350 would probably be OK behind that engine. Especially if your dad drives like suits the truck -- gentleman -- you'll have no problems if it's a quality rebuild.

What I think is cool is that he has a G.J. he's working on and that you're helping him with it. Would he mind if you tossed up a few photos? It would be cool to see.

**old Rusty C10** · 10-05-2020, 02:15 PM

any th 350 i get redone i always have em throw a shift kit into it

10-04-2020, 02:23 PM	#1
72malibu Active Member Join Date: Jun 2019 Location: Gaithersburg, MD Posts: 105	TH350 - Performance Automatic? Hello, helping my dad swap out a Muncie in his Gentleman Jim for a TH350, as it came from the factory. It'll be easier for him to drive an auto these days. I'm physically close to Performance Automatic in Frederick MD. Anybody have anything positive or negative to say about their Stage 1 TH350? It'll be going behind the original 350 with a mild cam/manifold and headers. Also, these square body trucks had a 9 inch tailshaft, right?

10-04-2020, 10:51 PM	#2
LT7A Registered User Join Date: Oct 2015 Location: PNW Posts: 3,582	Re: TH350 - Performance Automatic? I don't know anything about that transmisson builder but even a stock rebuilt TH350 would probably be OK behind that engine. Especially if your dad drives like suits the truck -- gentleman -- you'll have no problems if it's a quality rebuild. What I think is cool is that he has a G.J. he's working on and that you're helping him with it. Would he mind if you tossed up a few photos? It would be cool to see.

10-05-2020, 02:15 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,281	Re: TH350 - Performance Automatic? any th 350 i get redone i always have em throw a shift kit into it __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!



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