Turbo 350 or 400 transmission ?
 

How do I know which tranny I have? It was a stock 305ci Silverado step side.:chevy::chevy:

Re: Turbo 350 or 400 transmission ?
 

Most likely a TH350 unless it is an overdrive 700R4. The transmission pan will be more or less square with a corner cut off for a TH350 and square for a 700R4 and roughly a Texas shape for a TH400. Lots of web sites with pics and pan shapes.

Re: Turbo 350 or 400 transmission ?
 

Do you have a sticker inside the glove box with RPO codes?

Does the gear shift indicator above the steering column have an overdrive option?

What year is the truck?

Re: Turbo 350 or 400 transmission ?
 

1986. Based on the pan, I think it is a th350. The glove box sticker didn't help. Thanks for the advice.

Re: Turbo 350 or 400 transmission ?
 

Mx1 is what is shown in the glove box. Research agrees that I have a th350. I am ordering a TCI tranny from summit unless some one on here has some negatives about them to share.

Re: Turbo 350 or 400 transmission ?
 

If its a weekend toy a turbo 350 is fine,If its a daily driver i would run a 700r4 because of the over drive.