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Old 02-22-2015, 07:57 PM   #1
lanconcj
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Turbo 350 or 400 transmission ?

How do I know which tranny I have? It was a stock 305ci Silverado step side.
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Old 02-22-2015, 08:15 PM   #2
jetmech85
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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.
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Old 02-22-2015, 08:34 PM   #3
Laser145
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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?
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1987 R10
1976 K10
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Old 02-22-2015, 08:58 PM   #4
lanconcj
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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.
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Old 02-22-2015, 09:33 PM   #5
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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.
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Old 02-23-2015, 02:37 AM   #6
andrewmp6
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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.
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