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Rear main seal (transmission - driveshaft seal)

  • Thread starter Thread starter Road_Runna
  • Start date Start date Aug 19, 2008
R

Road_Runna

20+ Year Stangneter
Dec 23, 2002
594
6
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Ogden, UT
Aug 19, 2008
#1
  • Aug 19, 2008
  • #1
Is a tool needed to remove and install this seal, or can it just be done.
What about the tps sensor on the drivers side on the transmission.
 

Chythar

Recently finished repairing my rear
20+ Year Stangneter
Aug 26, 2004
2,373
140
113
55
Foothill Ranch, CA
Aug 19, 2008
#2
  • Aug 19, 2008
  • #2
A tool isn't needed but makes life easier. Removing with a flat-head screwdriver is easy enough. I had trouble with the install, but I used a paint can lid over the seal to get it started, then it went on easy.

Don't hit the seal too hard in any one place, you may bend it.
 

Yellow302

Member
Mar 2, 2003
789
2
19
42
NJ
Aug 19, 2008
#3
  • Aug 19, 2008
  • #3
i just did mine, used some picks or a flat head and it came out.

for the install i just used to old seal set on in front of the new one and tapped it in with a hammer
 

Zero Signal

Active Member
Feb 24, 2003
2,633
2
46
Tucson, AZ
Aug 19, 2008
#4
  • Aug 19, 2008
  • #4
I had a very hard time getting the rear main out. What I ended up doing (VERY carefully) was putting a couple of course threaded screws (drywall screws) into the metal body of the seal, gripping them with vise grips and slowly wiggling/prying it out. The trick was to get the screws in straight and not too deep to not scratch the important surfaces. It's a risky practice but it was the only way for my to get it out. Installing it was a matter of tapping it very gently all around in with a flat punch, it took 30 seconds.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Aug 19, 2008
#5
  • Aug 19, 2008
  • #5
Thread title:

Rear main seal (transmission - driveshaft seal)
Click to expand...

Road_Runna said:
Is a tool needed to remove and install this seal, or can it just be done.
What about the tps sensor on the drivers side on the transmission.
Click to expand...

Are you talking about the seal at the back of the trans (where the DS slides into)? That is not the rear main seal (more like a trans output shaft seal).

The sensor on the side of the trans is the not a TPS. To remove the trans range sensor, you simply undo the electrical connector and then remove the two bolts holding the TR to the trans (IIRC).

When you reinstall the TR, be sure the shifter is in neutral. Then align the index marks on the sensor.
You can also ohm out your old sensor if you need to. Did you find a new one for not too much money (I'm curious myself).
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Aug 19, 2008
#6
  • Aug 19, 2008
  • #6
HISSIN50 said:
Thread title:





Are you talking about the seal at the back of the trans (where the DS slides into)? That is not the rear main seal (more like a trans output shaft seal).

The sensor on the side of the trans is the not a TPS. To remove the trans range sensor, you simply undo the electrical connector and then remove the two bolts holding the TR to the trans (IIRC).

When you reinstall the TR, be sure the shifter is in neutral. Then align the index marks on the sensor.
You can also ohm out your old sensor if you need to. Did you find a new one for not too much money (I'm curious myself).
Click to expand...

I thought he might be referring to the vehicle speed sensor (VSS).
 

blksn955.o

Founding Member
Mar 15, 2002
3,263
0
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st.louis mo 314
Aug 19, 2008
#7
  • Aug 19, 2008
  • #7
I used a small flat head screw driver and worked it around the seal. I got it worked out a little then really laid into the seal and pushed it into itself in one spot. I then just pried it out. Took like 2min.

To install the new one I used a big socket. I got one that roughly matched the inner part that went into the tail shaft. I put a light coat of RTV and tapped it into the trans.

The hardest part is the rear driveshaft removal.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Aug 20, 2008
#8
  • Aug 20, 2008
  • #8
toyman said:
I thought he might be referring to the vehicle speed sensor (VSS).
Click to expand...

I didn't think of that. You very well could be right.
 
R

Road_Runna

20+ Year Stangneter
Dec 23, 2002
594
6
39
46
Ogden, UT
Sep 6, 2008
#9
  • Sep 6, 2008
  • #9
When pulling the old seal out (rear main seal) did you guys use the stroker for leverage..

Where would I place the flat head screw driver to pull that seal out, on the inside diameter or on the outside diameter in respect to the seal itself?
 

blksn955.o

Founding Member
Mar 15, 2002
3,263
0
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st.louis mo 314
Sep 6, 2008
#10
  • Sep 6, 2008
  • #10
OK, I thought you were talking about the seal at the end of the trans. were the driveshaft connects/goes into the trans.

Totaly different seal...the rear main seal.

I still used a flatheat screwdriver to take one out, did this on my old factory shortblock in the mustang and also in my old 90 fullsize bronco with a 302. You need to be 100x's more carefull with the rear main removing it. I just kind of worked it out without fear of tearing up the seal...110% focus on NOT touching the crank at all.

If you can manage to keep the rear main you removed in some kind of good shape you can use the old one to help you install the new one. Fit the new rear main seal by hand and get it started. Then use the old rear main only reversed in that the wide parts of the rear mains (both old and new back to back) and you can tap on the old seal to seat the new one. The old seal takes the abuse/damage and seats the new one.
 
R

Road_Runna

20+ Year Stangneter
Dec 23, 2002
594
6
39
46
Ogden, UT
Sep 7, 2008
#11
  • Sep 7, 2008
  • #11
blksn955.o said:
OK, I thought you were talking about the seal at the end of the trans. were the driveshaft connects/goes into the trans.

Totaly different seal...the rear main seal.

QUOTE]

Yeah, I ended up replacing that one and the front transmission pump (mates the torque converter) in my journey to find that rear main seal, and I finally found it. I've got a lite oil leak somewhere, im hoping this seal will end that.
Click to expand...
 
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