The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

whtgmc68 · 09-14-2018, 11:15 AM

The LS1 was the first iteration of the LS family and is more performance oriented since it debuted in the C5 Corvette. The 4.8, 5.3 and 6.0 are the iron block aluminum head truck engines from the LS family. There are aluminum versions of the truck motors that came in various vehicles like the Trailblazer SS. There are lots of parts interchangeability between the LS1 and the LS truck engines.

The engine and tranny from the TA in your Blazer with a 3.73 gear will be stout and reliable as the day is long and you will most like see MPGs in the mid-20's. You could easily get another 50k miles out of the engine and who knows how long the T56 will go. They are pretty stout trannys. You could rebuild both the engine and tranny and still not have as much in your drivetrain as many others will have for a lower mileage engine and transmission.

09-14-2018, 11:15 AM	#10
whtgmc68 Registered User Join Date: Oct 2011 Location: King, NC Posts: 63	Re: 1999 Trans Am 5.7 6 speed The LS1 was the first iteration of the LS family and is more performance oriented since it debuted in the C5 Corvette. The 4.8, 5.3 and 6.0 are the iron block aluminum head truck engines from the LS family. There are aluminum versions of the truck motors that came in various vehicles like the Trailblazer SS. There are lots of parts interchangeability between the LS1 and the LS truck engines. The engine and tranny from the TA in your Blazer with a 3.73 gear will be stout and reliable as the day is long and you will most like see MPGs in the mid-20's. You could easily get another 50k miles out of the engine and who knows how long the T56 will go. They are pretty stout trannys. You could rebuild both the engine and tranny and still not have as much in your drivetrain as many others will have for a lower mileage engine and transmission.