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Old 10-09-2007, 07:53 PM
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86 silverado 4x4 w/700r4 problems

I have a 86 silverado 4x4 w/700r4. It has 1-2&R I haveno aparent 3-o/d. when I shift in to drive on the collom the trans will shift from 1st - 2nd very hard but when it goes to shift from 2nd to drive it seems to have gone into neutral I thought. But when it shifts there if I mash on the peddel I get extreamly high RPMs along with torqu thrust. (meaning I stil have power to the rear wheeles just not as drive power more like 1st gear Rpms /Power.

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Old 10-09-2007, 08:13 PM
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Quote:
Originally Posted by MuddSlinger2373
I have a 86 silverado 4x4 w/700r4. It has 1-2&R I haveno aparent 3-o/d. when I shift in to drive on the collom the trans will shift from 1st - 2nd very hard but when it goes to shift from 2nd to drive it seems to have gone into neutral I thought. But when it shifts there if I mash on the peddel I get extreamly high RPMs along with torqu thrust. (meaning I stil have power to the rear wheeles just not as drive power more like 1st gear Rpms /Power.

What is the history of this trans? Mileage , age , recent repair work or over - haul?

The 3rd gear clutch pack known as the 3-4 clutches is a common failure of this trans.

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Old 10-09-2007, 10:26 PM
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86 700r4 History??????

The only thing Iknow is Its a jasper Trans and I have changed the fluid and filter 2 times in the past 3 weeks.The first time fluid was changed was because it looked to be a little dark didnt find any large amounts of deposites in the pan eather times they were changed.Whats the poss of a broken gov?
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Old 10-12-2007, 12:13 PM
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86 silverado

It would not be likely that your governor is causing this problem.

With a no upshift condition maybe, but your's makes a 1-2 then neutral on the 2-3.

As was pointed out by Crosley, 3-4 clutch failure is very common with this trans.

However, weird things do happen with governors.

If you want you can attach a pressure gauge to your transmission, a 0-300 psi gauge at the mainline port, near the linkage, to check it.

When the wheels spin the governor spins. As it spins it produces pressure that it directs to your valve body.

This pressure acts on the shift valves to move them so your trans can change gears.

If you drive your vehicle with the gauge on, or get the wheels off the ground, so they can spin, you will notice that each time the transmission shifts the gauge will flicker a little.

As the shift valve moves to change gears it will cause a slight disruption with the pressure, as you read it.

This is benificial because if the gauge flickers when it trys to shift into 3rd then you will know that A- the shift valve moved and B- that it would not have moved if the governor did not make it move. Cool?

So if the shift valve moved[gauge flickered] and it goes into neutral, on the 2-3 shift, you will know that Crosley was right, darn that Crosley!
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Old 10-12-2007, 08:16 PM
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I would probably be wiling to go out on a limb and say that the 3-4 is gone and if the fluid condition is good maybe the 3rd lugs are gone or the snapring broke.
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Old 10-12-2007, 10:35 PM
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Quote:
Originally Posted by MuddSlinger2373
The only thing Iknow is Its a jasper Trans and I have changed the fluid and filter 2 times in the past 3 weeks.The first time fluid was changed was because it looked to be a little dark didnt find any large amounts of deposites in the pan eather times they were changed.Whats the poss of a broken gov?

it is a good idea to break open the filter for inspection when changed . these trans flow lots of fluid internally. they can suck up plenty of debris and the pan is then fairly clean
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