Rebuild th400 or 4l80e?

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txaggie

Full Access Member
Joined
Apr 1, 2024
Posts
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Location
austin texas
First Name
kris
Truck Year
1985
Truck Model
suburban C20
Engine Size
454
Howdy all!

I have an 85 454/th400 suburban and my first travel trailer pull (6miles in) caused me to puke out new tranny fluid out the vent tubes. The fluid came out burnt and black so I’m guessing the clutches are shot. Should I rebuild this thing (much cheaper?) or swap to a 4l80e (new shaft, controller, etc?)?

The turbo 400 looked good on the inside but I wonder if being 40 years old made it take the cake when I towed with it?
 

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