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#4071518 - 07/22/20 06:08 PM Should I replace ext. bushing or just trans seal
Brett04 Offline
n00b

Registered: 09/17/13
Posts: 23
Loc: Southern PA
My seal at the rear-end of the transmission is leaking. I was going to replace just the seal, then I saw that it is a good idea to replace the extension-housing bushing at the same time (the bushing for the slip-yoke).

I'm finding limited options for places to get a bushing, and they all say it is for the 4R70W transmission. Mine is a 4W7P-7000-EA (if I'm reading the tag correctly). But I have a vague recollection that the 4R70W used the same extension (my extension is RF-F3UP-7A040-AA).

Does it make sense to replace the bushing when replacing the seal?
If so, will the extension-housing bushing for the 4R70W fit my transmission?
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#4071530 - 07/22/20 07:34 PM Re: Should I replace ext. bushing or just trans seal [Re: Brett04]
Lance01 Offline
Member

Registered: 04/02/18
Posts: 333
Loc: Pa
I'm not the transmission expert but I would just change the seal and leave the bushing alone.

I have heard tailshaft bushing is a little tricky to install correctly and one transmission builder said once the new bushing is installed you can have problems where the yoke don't want to fit into the tailshaft.

Btw, there is a special tool to install the tailshaft seal correctly but I got away with just taping it flush with a hammer and haven't had any issues.

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#4071540 - 07/22/20 08:02 PM Re: Should I replace ext. bushing or just trans seal [Re: Brett04]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7121
Loc: MA
Brett, your car has a 4R70W (or 4R75W)...they both use the same bushing and seal.

In case you weren't aware, replacing the bushing involves removing the tailshaft housing which means removing the crossmember, a job best done on a lift, not in your driveway.
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#4071596 - 07/22/20 11:41 PM Re: Should I replace ext. bushing or just trans seal [Re: Brett04]
88grandmarq Offline

4R70W rebuilder
Poobah

Registered: 07/10/02
Posts: 6816
Loc: Indiana
where are you seeing the leak? on the slip yoke? or further back around the U-joint?

there are 2 different seals on the police transmission the long output shaft.
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#4071634 - 07/23/20 10:55 AM Re: Should I replace ext. bushing or just trans seal [Re: Brett04]
BigMerc96 Offline

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Registered: 06/05/10
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If you opt to replace the bushing, I'd recommend buying a whole new (or remanufactured) extension housing. My '98 had a bad bushing, looking into replacing it, I discovered that without special tools you really do need to take the housing off the car. So I decided to buy a remanufactured housing, and I'm glad I did, because after fighting with it to get the housing out of the car (transmission crossmember put up a HUGE fight), I really was not in a mood to then have to drive out the bushing and seal and then hope I got the new one driven in straight. It was 100% worth the extra $50 over just buying the parts to just be able to bolt in a new housing and be done. 4R70W/4R75W/4R75E extension housings are readily available both new and reman online, I bought a reman one from a company out of Ohio on eBay, it arrived with the bushing properly installed, with the new seal, and the gasket that goes between it and the transmission for something like $70.

On the "long" housings like a P71 and Town Car use, there is also an o-ring on the output shaft that can wear. This is what 88GrandMarq is alluding too. He would know better than me but I believe that o-ring requires removing the housing to replace, and when it does leak the fluid will usually seep out thru the weep hole in the u-joint yoke rather than around the output seal like when the bushing or extension housing seal leaks.
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#4071860 - 07/25/20 11:02 AM Re: Should I replace ext. bushing or just trans seal [Re: Brett04]
Brett04 Offline
n00b

Registered: 09/17/13
Posts: 23
Loc: Southern PA
I appreciate all of the advice. I put the new seal in (using a piece from a ball-joint kit to drive it in place). I did not change the bushing, but checked for any play in the bushing after re-installing the driveshaft. I did not detect any play.
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