'86 GT 2.8 V6 tranny question.

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Rich Grise - 14 Oct 2006 02:16 GMT

I had an opportunity to get up to 75 MPH today - in So. Cal, imagine my
surprise!

Anyway, I checked the tacho, and at about 72 MPH, I was turning 5500 RPM,
which is orange-line. (well, more olive drab, but you get the point), and
redline is 6K.

Shouldn't I have some kind of overdrive at the top end, or another whole
gear, or something? Or is that the way it's designed? The speedo pegs at
only 85, BTW.

It _felt_ OK, engine-wise, but I think the tires and the grooves in the
highway were arguing over who gets to drive, but that's probably a tire
inflation issue, so I'll be airing up probably tonight.

Anyway, about the tranny, I admit, it's been a couple of years since it's
been properly serviced, but I can't afford much of anything beyond
changing the filter and fluid.

Do I need my bands tightened? Or should I just do the filter and fluid
and see what happens?

Thanks,
Rich

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John Craker - 14 Oct 2006 19:53 GMT

You didn't mention it, but by the statement "bands tightened" I assume you
have an auto?

I'll also assume you haven't got 10" Austin Mini tires on it. ;)

You SHOULD be turning 3000rpm at 60MPH (+/- YMMV).

I'd:
A) Get your tach checked with an external source
B) do the same to your speedo.

>I had an opportunity to get up to 75 MPH today - in So. Cal, imagine my
> surprise!
[quoted text clipped - 20 lines]
> Thanks,
> Rich

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gw - 17 Oct 2006 13:30 GMT

>I had an opportunity to get up to 75 MPH today - in So. Cal, imagine my
> surprise!
[quoted text clipped - 20 lines]
> Thanks,
> Rich

All '86 GT's came with 120 MPH speedometers. Yours has been switched out.
This being the case, it's possible you have a 4 cylinder tachometer, which
would read 50% high. 85 MPH speedos came in the 4 cylinder coupes. Suggest
you get the right instrument cluster for the car.

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John Craker - 19 Oct 2006 02:15 GMT

>> Anyway, I checked the tacho, and at about 72 MPH, I was turning 5500 RPM,
>> which is orange-line. (well, more olive drab, but you get the point), and
[quoted text clipped - 4 lines]
> would read 50% high. 85 MPH speedos came in the 4 cylinder coupes. Suggest
> you get the right instrument cluster for the car.

He does say that it was reading '5500 which is orange line'
(and we all know that a duke tach at 5500 has a picture of a rod hanging out
of the block!) - so it must be a V6 tach.

Speedo does sound 'wrong' though.

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