Differences in Transmissions

[Ray Hamilton]

Is there a difference between an '83 S10 4WD 700R and an "86 S10 4WD 700R?
I see the rebuild kits stop at '84 then p/u with a different # for '85 and '86. Can't the difference, if any, be overcome?

[sharkey]

the difference is the valve body gaskets that come in the kit, along with a few seals. its best to get the overhaul kit for the correct year of the transmission.

[Ray Hamilton]

Thanks for the reply. The reason I asked is I picked up an '83 in good condition for a spare for my '86 Blazer. I looked to see if the kits were different to see if maybe there was a fit problem.

[sharkey]

as far as swapping the entire unit out, the only issue you may have is with lockup. worst case you would have to put the internal transmission wiring harness into the 83 tranny for it to work correctly.

[Ray Hamilton]

That doesn't sound too easy. Will it work w/o it? When did they come out with that? This '83 has a plugin on the mid left side of the trans. It's square and has 3 male connectors inside it.

[sharkey]

thats the lockup plug, its on all 700r4 transmissions. as long as both transmissions have the pins in the same location (some had 2, 3 or 4 wires in that plug) you should be fine. if left unplugged, the tranny will work fine, you just wont have lockup and sacrafice fuel economy.

[86euro]

You will also need to use the convertor from the later tranny, it has a 30 spline input shaft as opposed to a 27 spline.

***EDIT*** I read what you are doing backwards, just keep the right convertors with the right trannys.

[Ray Hamilton]

Keep the '83 convertor with the '83 and '86 with the '86. Thanks for the replies. This is supposed to be a good working trans I got for $50. They're getting hard to find used around here, even cores.