What Transmission do I have?


Old 05-03-04, 11:34 AM
Thread Starter
Join Date: Jan 2003
Posts: 34
What Transmission do I have?

Okay, this may seem stupid to all of you. I just recently purchased a 1986 Chevy 1/2 ton, 2wd, 6.2 litre diesel pickup with an Automatic Transmission. How do I determine what "model" of transmission I have? I want to change the transmission fluid and filter, but I see that there are three listed.

Thanks for the help.
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Old 05-03-04, 04:45 PM
WeldGod's Avatar
Join Date: Mar 2003
Location: Texas
Posts: 616
Lightbulb Your Bolts

Hi! Your truck more than likely has either a THM400 (TH400) or a THM700-R4 (TH700R4). If your pan as 13 bolts you have a TMH400, if your pan has 16 bolts you have a THM700-R4

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