shift lever seal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1tuff71 · 05-15-2018, 05:14 AM

ok guys having a problem getting the shift lever seal to seal. replaced this bugger twice and it still leaks. is there another problem to look for here. read all the posts I could find on this with no luck. I have the correct tool for removal and cant see anything else. is it possible the shaft is so worn that a new seal wont fix it. hate to replace the trans just to fix it. can I use some atv on the seal. maybe the shaft is too worn. help !!!

1tuff71 · 05-15-2018, 09:06 AM

sorry I didn't give more details. its a th350 automatic in a 71 blazer 4x4

geezer#99 · 05-15-2018, 09:14 AM

You likely need to remove the shaft to clean it up. Could be a small burr or two on it.

*YoungPup1977* · 05-15-2018, 11:28 AM

On the all times you changed this seal did you drop the pan down and take the shaft out of the case..... did u install the seal without the shaft in the case ?

*YoungPup1977* · 05-15-2018, 11:51 AM

Make sure the case is clean when installing this seal. Once you have the linkage and shaft removed clean the case real good to make sure no dirt or anything is inside where the seal goes into the case. I use a 1/2 inch deep well socket and use it as a seal driver. Being careful to ensure seal is started into the case so you don’t roll the edge of the outer part of the seal. Once you tap the socket which forces the seal into place take the shaft and put STP onto it before you slide the shaft into the seal. Be careful not to damage the seal when installing the shaft into the case and do not let the shaft to dig into the case. Go in the case and seal straight. As mentioned check the lever shaft for any wear, burrs etc

The pic is a TH400 but it is the same concept. Good luck !!!

1tuff71 · 05-17-2018, 01:53 PM

thanks guys

1tuff71 · 05-17-2018, 02:08 PM

I didn't remove the shaft from the trans. I have had a bugger of a time with this. new pans, gaskets bla bla. chased it down to this seal now can't get that to seal. thought I may have a cracked case. again thanks for the help guys

GASoline71 · 05-17-2018, 07:56 PM

How's the dipstick and kickdown seals? Once that dipstick seal starts to leak fluid will travel to weird places and make it appear to be other areas.

Gary

*YoungPup1977* · 05-24-2018, 08:05 AM

Quote:

Originally Posted by 1tuff71

I didn't remove the shaft from the trans. I have had a bugger of a time with this. new pans, gaskets bla bla. chased it down to this seal now can't get that to seal. thought I may have a cracked case. again thanks for the help guys

Since you nailed it down to the lever seal is leaking,

I suggest to read post #5 again, execute that plan of attack...may get different results..

05-15-2018, 05:14 AM	#1
1tuff71 Registered User Join Date: Dec 2008 Location: Clarkston, Michigan Posts: 461	shift lever seal ok guys having a problem getting the shift lever seal to seal. replaced this bugger twice and it still leaks. is there another problem to look for here. read all the posts I could find on this with no luck. I have the correct tool for removal and cant see anything else. is it possible the shaft is so worn that a new seal wont fix it. hate to replace the trans just to fix it. can I use some atv on the seal. maybe the shaft is too worn. help !!! __________________ Bought this thing bone stock with intentions to just add a lift and tires and the next thing I knew it was on my garage floor in a million pieces. Sometimes the best laid plans........

05-15-2018, 09:06 AM	#2
1tuff71 Registered User Join Date: Dec 2008 Location: Clarkston, Michigan Posts: 461	Re: shift lever seal sorry I didn't give more details. its a th350 automatic in a 71 blazer 4x4 __________________ Bought this thing bone stock with intentions to just add a lift and tires and the next thing I knew it was on my garage floor in a million pieces. Sometimes the best laid plans........

05-15-2018, 09:14 AM	#3
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: shift lever seal You likely need to remove the shaft to clean it up. Could be a small burr or two on it.

05-15-2018, 11:28 AM	#4
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: shift lever seal On the all times you changed this seal did you drop the pan down and take the shaft out of the case..... did u install the seal without the shaft in the case ?

05-17-2018, 01:53 PM	#6
1tuff71 Registered User Join Date: Dec 2008 Location: Clarkston, Michigan Posts: 461	Re: shift lever seal thanks guys __________________ Bought this thing bone stock with intentions to just add a lift and tires and the next thing I knew it was on my garage floor in a million pieces. Sometimes the best laid plans........

05-15-2018, 11:51 AM	#5
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: shift lever seal Make sure the case is clean when installing this seal. Once you have the linkage and shaft removed clean the case real good to make sure no dirt or anything is inside where the seal goes into the case. I use a 1/2 inch deep well socket and use it as a seal driver. Being careful to ensure seal is started into the case so you don’t roll the edge of the outer part of the seal. Once you tap the socket which forces the seal into place take the shaft and put STP onto it before you slide the shaft into the seal. Be careful not to damage the seal when installing the shaft into the case and do not let the shaft to dig into the case. Go in the case and seal straight. As mentioned check the lever shaft for any wear, burrs etc The pic is a TH400 but it is the same concept. Good luck !!! Attached Images

05-17-2018, 02:08 PM	#7
1tuff71 Registered User Join Date: Dec 2008 Location: Clarkston, Michigan Posts: 461	Re: shift lever seal I didn't remove the shaft from the trans. I have had a bugger of a time with this. new pans, gaskets bla bla. chased it down to this seal now can't get that to seal. thought I may have a cracked case. again thanks for the help guys __________________ Bought this thing bone stock with intentions to just add a lift and tires and the next thing I knew it was on my garage floor in a million pieces. Sometimes the best laid plans........



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.