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which chevy trans is better or reliable THM400 or 4L80E

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  • which chevy trans is better or reliable THM400 or 4L80E

    hello all, i have a question and need some input. im looking to buy a tt and a tv. the trailer weighs in about 7500lbs plus what else i put in there. im looking in to buying an older chevy truck, specificly a 1991 chevy 3500 454. 91 was the first year for the 4L80E and the last year for the 3rd gen body style. my question is which trans would be more durable. the 400 is only a 3spd 1st 2.48 2nd 1.48 3rd 1.00 while the 4L80E is a 4spd w/od 1st 2.48 2nd 1.48 3rd 1.00 4th 0.75 final drive differ from 3.42, 3.73, and 4.10. not sure how they determin which vehicle gets what final drive. for the THM400 i could always get a gearvendor over under drive or what ever its called but that not cheap. ive towed with the 4L60E and the THM400 but not the 4L80E. has any one ever attempted to put a 4L80E in an older chevy? piece of cake or not worth the hassel?

  • #2
    Re: which chevy trans is better or reliable THM400 or 4L80E

    I honestly dont know the differences , but I do know the 400 is indestructible

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    • #3
      Re: which chevy trans is better or reliable THM400 or 4L80E

      IMHO, without a doubt, the Turbo 400. My old, long-gone cab-over and boat ate three THD350's before I got smart and had a friend build me an RV THD400. Problem solved. I currently run a 6L80E in a strip car, a variant and close cousin to the 4L80E. When it grenades I'll replace it with a THD400. Give great consideration to the torque convertor too. That decision could be as important as the trans, especially if you select the wrong one. I currently have a THD400 under a 32' Class A Southwind. Not a single problem, other than the ill-conceived hydraulically actuated drum-style parking brake assembly mounted on the back of the 400. What a piece of crap: NEVER trust this design. I ALWAYS put my hydraulic jacks down EVERY PLACE I stop.


      Of course, you already made this decision two years ago. What did you choose, and any regrets?

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