Author Topic: Overdrive  (Read 1263 times)

Offline Smitty31

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  • 1979 GMC High Siera 4wd & 1986 custom deluxe 2wd
Overdrive
« on: April 17, 2018, 06:07:36 PM »
1986 c10 4.3 v6 400 transmission 2wd. What is the latest model overdrive trans that will work with my truck. I know the 1987 overdrive trans is better than a 1983 - 1986. But will a newer overdrive trans than a 1987 work.
IF ITS WORTH DOING. THEN ITS WORTH DOING RIGHT.

Offline VileZambonie

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Re: Overdrive
« Reply #1 on: April 17, 2018, 06:22:17 PM »
The 700R4/4L60 is the least expensive non computer controlled trans with overdrive. Anything newer requires computer, sensors, wiring etc.
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Offline 1967KaiserM715

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Re: Overdrive
« Reply #2 on: April 17, 2018, 06:23:14 PM »
Depends on how much wiring you want, and if the trans has been rebuilt.

The 700r4 automatic was made until 88* replaced by the 4L60, until 93 or 94, when it was again replaced by the 4L60E. The E designates electronic shift control.

The 4l60 is basically the same as a 700r4, some minor internal changes, just a name change.

88* I've seen several different swap over years for when they called it the 700r4, or the 4L60, and vice versa.

In a 1/2 ton 2wd, any slightly built 700r4 will be fine, unless it's behind an LS, in which case slightly even more built may be better.

If I remember from my research, the cases will vary, and some years are better then others. This has to deal with valve body changes, and passage changes.

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
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