'97 Crown Vic OD trans, who's done tailshaft housings? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-09-2006, 08:21 PM
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'97 Crown Vic OD trans, who's done tailshaft housings?

Little brother just bought one at police auction, had a driveshaft that broke at the front yoke, we changed that and still no motion. Checked fluid and it's way low. Dumped in a quart and found it leaking on the driveway. Anyhow, it broke the tailshaft housing between the mount and the boss that bolts up to the main case. I am thinking this happened when the driveshaft broke, so the tailshaft may be OK, have'nt pulled it apart yet. Too dark outside now. Anyone had these off the trans that can fill me in on whats inside? Looks like just the speedo drive, tailshaft, and maybe a bushing... anything else? Is the tailhousing prone to just break like that? I have pulled lots off GM 350 and 400 trannies, but not many Ford OD autos in the last few years. Only one i remember doing was a complete R&R with a reman trans, never took the old one apart...

Anyone, anyone...... Bueller????

Doc

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Old 09-10-2006, 11:14 AM
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IIRC all that is in there is the speedo drive and a support bearing. This is the first I have ever heard of one breaking, and I would check to make sure the output shaft isn't bent. The shaft is hell for stout, so I wonder how the casting broke.
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Old 09-10-2006, 12:32 PM
Where's my Sawzall?
 
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Thanks, what I thought...

It's an ex-county sheriff car, a tan-and-brown, and they dont exactly go easy on those cars around here. For all I know they could have jumped railroad tracks with it....

All the body panels are straight, good glass, and the motor runs tops. We had to replace some relays and fuses under the hood to get it going, think they made it a parts car right after the trans broke. Still has 3/4 tank of gas too.

Doc
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Old 09-10-2006, 06:50 PM
Where's my Sawzall?
 
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Update....

Got a tailshaft housing from another ex-police car at the yard today. $20 was a steal. Got the old busted one off and found the rear support in the main case for the tailshaft was cracked, looks like sealing rings inside will not seal any more. Ended up just replacing the tailshaft housing and driveshaft, topped off the fluid and tried it out anyways. Has Reverse, 1st and 2nd but when it gets to 40 MPH the thing flashes and no drive. My guess is the tailshaft has passages there for 3rd and OD, and this one will just internally leak instead of shifting and pulling.

Plan now is to get donor trans out of the yard in the next few days, and over the winter pull the somewhat-working trans out of the '97 and tear 2 down to make one. I priced the rebuild kit and at $200 we will come in a lot cheaper than $1400 + $350 core that the parts store wants for a reman unit.

Gives me something to do when it's snowing outside...

Thanks for the reply...

Doc
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Old 09-10-2006, 07:12 PM
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Output shaft and tail housing shouldn't affect hydraulic function. Don't know if there are electronics back there sensing shifting (I quit working with AODs before they went electronic), but I don't think so. The flashing suggests to me that the direct clutch is not operating, whether it is a bad clutch pack or a bad solenoid....

Good luck on the rebuild!
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Old 09-10-2006, 07:28 PM
Where's my Sawzall?
 
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Was thinking that myself...

I saw another thread about the 4R70 or whatever they call it now, went to Thunderbird and Cougar Club of America, VERY NICE 17 page buildup info for these trannies!See here for article...

About page 8 or 9 or so they show the tailshaft, it DOES have sealing rings, and with the rear of the case broken out where the shaft goes there will be a pretty good sized internal leak. I'm not sure what those passages are for, my thinking is that the crack in the case there is somehow related to 3rd and OD function. Maybe and maybe not. I AM glad we got the lower gears and Reverse working, so now it can be moved around without pushing it... Guess I will find out about the clutches when we tear it down in a few months, and who knows, he might pick up another one with a crashed body and a good trans.....everything at the auction was sold as-is, NOTHING was started.....and I think he scored big for $175, with a good body and a Jasper rebuilt motor...

Doc
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Old 09-10-2006, 10:41 PM
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direct drum feeds off the output shaft where the sealing rings are....

the PCM picks up on this problem of 3rd gear in the 4R70W and sets a trouble code.

If you piece tranny parts together..... you MUST use the 4R70W gear set (planetaries) for the correct gear ratios in this car. The PCM will pick up a gear ratio error if you use earlier / different planets from an AOD or AODE
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Old 09-11-2006, 03:49 PM
Where's my Sawzall?
 
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Thought so....

We will likely get the trans that we pulled the tailhousing off of at the yard, it's a 4R70W the same as the one we have now, but after police service the car was a taxi, it's got 330K on the trans right now. Does'nt appear too tuff to build a new one up with the info from that site, a good core trans, and the $200 rebuild kit, unless I might need some hard parts... might be able to get good used ones out of this broken trans we have now. Ford dealer is close by if we have to go that route..

Doc
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