Questions on Automatic trans!!!

  • denhamfly
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14 Aug 2012 13:02 #10103 by denhamfly
Questions on Automatic trans!!! was created by denhamfly
I am working on my car, but miss driving a 928. Mine is a 1985 5 speed, I am looking at is a 1985 automatic, with 150,000 mile on it. I always wanted an automatic for the traffic where I live is horrible sometimes, I have eaten up 2 clutches sitting on the bridge moving at about ½ a mile an hour. I would never get rid of my 5 speed but might add this to the stable. Below is the transmission problems, is his response bull** or is it time for a new transmission?
I lost park on the shifter not too long ago. After reading many forums, it sounds like the linkage. $200.00 part. It starts fine in neutral and have been using the parking brake when not in use.
The transmission started downshifting at speed from 4th to 3rd. You can simply shift back to 4th by accelerating to get the rpms up enough until it up shifts. Forum reading recommended using a transmission cleaner to resolve problem. Just put some in last week and seemed to lesson occurrence, but still happens. :rolleyes:

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14 Aug 2012 13:28 #10104 by srshaw3
Replied by srshaw3 on topic Questions on Automatic trans!!!
I would question the internals of the transmission. Sounds like it is slipping to me. Of course he doesn't mention if the fluid has been checked or replaced, so it could be a cheap fix. But if I were buying it as is, I would presume a transmission replacement is needed, and buy it with that in mind. Of course you aren't really looking for another project 928, are you? :D

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14 Aug 2012 21:30 #10125 by pcar928fan
Replied by pcar928fan on topic Questions on Automatic trans!!!
That does not sound good... Normally these transmissions are pretty good and when they start acting up if a fluid change does not fix it that is usually a bad sign...

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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14 Aug 2012 22:46 #10142 by 928mac
Replied by 928mac on topic Questions on Automatic trans!!!
Neutral and park are the same valving in the trans.
The difference is that in park a finger with a square cut end drops into a squar cut gear stopping the trans from rolling.

It sounds like the finger (parking paw) snapped.
The shifting change sounds like debree may have got into the modulator valving which is in the same area.

On the bench it is a simple replace the paw and blow out the debree.
But I have been wrong before and you just do not know until you look inside.

at this link it is part #8

www.jimellisporscheparts.com/showAssembl...ukey_product=3630500

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  • denhamfly
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15 Aug 2012 08:44 #10148 by denhamfly
Replied by denhamfly on topic Questions on Automatic trans!!!
Trying to decide if I want another project!!

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15 Aug 2012 09:27 #10151 by wallyp
Replied by wallyp on topic Questions on Automatic trans!!!
You never know what you will get from your box of chocolates...

If you are really, really lucky, the transmission will need adjusting. Shifter adjustment might solve the Park problem, but it doesn't sound likely.
Throttle cable adjustment might solve the 3-4 shift problem, or a full fluid change might help.

Removal and repair/rebuilding of the automatic is a major project. The cost will be close to the value of the car if you have it all done by a shop. The Park pawl is nearly the last part that comes out of the case.

Bottom line - a big gamble. Take the cost of the car, and add estimates for the rebuilding or replacement of the transmission. How nice an automatic could you buy for the total?

Wally

Wally Plumley
928 Specialists
www.928gt.com

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15 Aug 2012 12:00 #10159 by 928mac
Replied by 928mac on topic Questions on Automatic trans!!!
remove the trans pan and check for metal chips. you may find something that helps you deside what to do.
BTW yes it could be that the linkage is out of adjustment and the modulator could fail and start sucking oil at the same time?

Inspect, inspect, inspect.

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17 Aug 2012 03:30 #10229 by Kiln_Red
Replied by Kiln_Red on topic Questions on Automatic trans!!!
Oscar,

These transmissions are tough!! If the car simply won't shift into park I would bet the seller's presumption that their is a fault with the shifter linkage is accurate. Also, there may be something simply disrupting the shifter's travel. You can easily inspect this right from the driver seat. Remove the shifter t handle, boot, and the bezel. Look inside and see if if there is any interference there.

As for the 4th gear shifting issue; I am betting that the transmission is simply low of fluid. My 84 auto had the same symptoms when I had a cooler hose leaking on it at the radiator. To check the fluid, you will have to jack the rear of the car. The resevoir is in front of the crossmember on the passenger side of the car. Sometimes it is coated in grease and can be difficult to identify. Run the car up to operating temperature and leave it in neutral when checking the level of course.

Sort these issues before committing. :D

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