Trans shift shaft seal problem/replacement question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

realsales87 · 07-09-2013, 08:44 PM

Hi All,

I have a TH350 transmission and have traced my only "current" leak of transmission fluid back to the Shif Shaft Seal on the drivers side of the transmission. To start, I did not make the score marks on the transmission near the seal (previous owner). Anyways, I removed the linkage and was able to easily remove the old seal with a sharp pick tool. I then purchased a new seal shown in photos below that has metal on one side and rubber seal on the other side. I gently slid it over the shaft, then took a socket and tapped it into place. STILL LEAKING. So my question is: Can I put some sort of liquid seal in there along with a new/or current seal (I bought 3 in case I messed the new seal up). Or does it look like a lost cause due to the damage done to the transmission housing area (from previous owner)? Also, How far back to you tap the seal in? ANY ADVISE IS APPRECIATED. Thanks in advance.

79Betty · 07-09-2013, 08:51 PM

Could try putting alittle bit of silicone on the side where it's chewed up... And hit it in all the way seated. I have a 4 spd now but had the same problem.
Posted via Mobile Device

realsales87 · 07-09-2013, 09:30 PM

Thank you for this input, I may try and add some silcone and push it all the way in...maybe that will help. Thanks for your input.

79Betty · 07-09-2013, 09:59 PM

Be careful on how much u use. I've always heard automatic's are sensitive
Posted via Mobile Device

Tx Firefighter · 07-10-2013, 09:31 AM

Definitely put a dab of sealer on the outside ring of the seal to compensate for the damaged case area. It's not going to get inside the transmission.
Posted via Mobile Device

07-09-2013, 08:44 PM	#1
realsales87 Registered User Join Date: Jun 2012 Location: Wesley Chapel, FL Posts: 16	Trans shift shaft seal problem/replacement question Hi All, I have a TH350 transmission and have traced my only "current" leak of transmission fluid back to the Shif Shaft Seal on the drivers side of the transmission. To start, I did not make the score marks on the transmission near the seal (previous owner). Anyways, I removed the linkage and was able to easily remove the old seal with a sharp pick tool. I then purchased a new seal shown in photos below that has metal on one side and rubber seal on the other side. I gently slid it over the shaft, then took a socket and tapped it into place. STILL LEAKING. So my question is: Can I put some sort of liquid seal in there along with a new/or current seal (I bought 3 in case I messed the new seal up). Or does it look like a lost cause due to the damage done to the transmission housing area (from previous owner)? Also, How far back to you tap the seal in? ANY ADVISE IS APPRECIATED. Thanks in advance. Attached Images

07-09-2013, 08:51 PM	#2
79Betty Registered User Join Date: Jan 2013 Location: Jasper, IN Posts: 948	Re: Trans shift shaft seal problem/replacement question Could try putting alittle bit of silicone on the side where it's chewed up... And hit it in all the way seated. I have a 4 spd now but had the same problem. Posted via Mobile Device __________________ When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10

07-09-2013, 09:30 PM	#3
realsales87 Registered User Join Date: Jun 2012 Location: Wesley Chapel, FL Posts: 16	Re: Trans shift shaft seal problem/replacement question Thank you for this input, I may try and add some silcone and push it all the way in...maybe that will help. Thanks for your input.

07-09-2013, 09:59 PM	#4
79Betty Registered User Join Date: Jan 2013 Location: Jasper, IN Posts: 948	Re: Trans shift shaft seal problem/replacement question Be careful on how much u use. I've always heard automatic's are sensitive Posted via Mobile Device __________________ When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10

07-10-2013, 09:31 AM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Trans shift shaft seal problem/replacement question Definitely put a dab of sealer on the outside ring of the seal to compensate for the damaged case area. It's not going to get inside the transmission. Posted via Mobile Device

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