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Old 01-26-2005, 07:43 PM
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Th 350 Question

Anyone know if there is signifigant differences between a TH 350 behind a GM Diesel engine as opposed to a gasoline one?

The transmissions appear the same.

Reason for asking is I got a TH350 for free from behind a diesel engine and am planning a V8 gasoline engine swap into my 89', 4 cylinder, 5 speed S-10 pickup.
I plan on using a 4 barrel, 283 engine.

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Old 01-27-2005, 04:36 PM
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I assume it was a 5.7L olds diesel as I have never seen a 350 behind a 6.2. Being from an olds 350 it will have the olds belhousing bolt pattern so keep that in mind.
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Old 01-27-2005, 08:01 PM
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Trans Id

Thankyour for your response:

According to the information above, after going and looking at the transmission again, it appears to be a 700R4~4L60.
It has 16 bolts for the bottom pan and measures approx. 24 inches long plus the tailshaft housing.
It has the Chevrolet bellhousing bolt pattern.

Now my only question is, the torque converter. Will I need a new one of those or be able to use the one from behind the diesel engine?
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Old 01-28-2005, 06:13 AM
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You are doing the same thing I was working on at this time last year.

Your diesel converter will have a stall speed near 1400rpm's or less.

A gas converter has a stock stall more near 1700rpm's and higher.

The converter is the only thing you will need to change for this swap.

Just remember with the TH-700R4, you will NEED to use a transmission cooler, and more importantly adjust the TV (throttle valve, NOT the commonly misrepresented "kickdown" or "passing gear") cable before moving the truck with the transmission.

There are many sources on the internet to guide you through the steps of properly adjusting the TV cable.
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Old 01-29-2005, 09:43 PM
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Adjustments

Thank you for your response. I now know I can proceed with this project.
I will find the appropriate info to set the TV and be smoking tires just for the fun of it.
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Old 01-30-2005, 06:36 PM
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Coming from an oil burner I bet it shifts at a very low RPM at WOT. WOT shift RPM is controlled by the govener. It is in behind the round cover on the side of the trans near the back. While they do make recalibration kits it might just be easier to get one from a camaro from the j/y and see how it works.
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Old 03-26-2005, 08:04 PM
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...so how did your swap turn out Driven ? the reason you found that 350 behind the diesel is cause the early 700R gave a ton of problems and the owner probably got sick of fixing it or couldn't afford it anymore. The turbo 350 is a direct swap with the 700R and was very common. Only other from factory back then was a turbo 400, but never a 350 . The diesel 700R's had a 6 bolt torque converter also , whereas gas used 3 bolt to the flywheel.
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