Possible bad rear tranny seal

Moderator: Mod Squad

User avatar
StarDiero75
Registered User
Posts: 428
Joined: Tue Jun 13, 2017 9:39 pm

Possible bad rear tranny seal

Post #1 by StarDiero75 » Sat Feb 17, 2018 7:22 pm

Howdy guys!

So i recently bought a rebuilt 65 3.03 toploader to replace mine. The new one was rebuilt 7 years ago and has never been run. So i am about to put it in and decide to fill it with fluid first since its easier to fill it that way.

So its sitting on the bench, the tail shaft is pointing downwards due to the way it sits, and after i fill it, it starts leaking out the back after about a minute of being filled. Is that normal? Does it only not leak with the driveshaft in it? Or is this a bad seal from sitting 7 years without being used?

Thanks guys!
Ryan
--1965 Ranchero w/1966 200 and 3.03 column shift, 8" rear 2.8 (Yes I know the gearing sucks), weber 32/36, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

User avatar
wsa111
FSP Moderator
Posts: 2935
Joined: Sat Jan 24, 2004 5:28 pm
Location: South Carolina
Contact:

Re: Possible bad rear tranny seal

Post #2 by wsa111 » Sat Feb 17, 2018 8:11 pm

Ryan, you need the driveshaft in it. If you still have a leak with the driveshaft installed, it could be a hardened seal or did they replace the tailshaft bushing. Check for excessive play with the front yoke in it.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, HEI dist. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
Image

mustang6
VIP Member
Posts: 1408
Joined: Thu Oct 23, 2003 11:32 pm
Location: near Tacoma, WA USA

Re: Possible bad rear tranny seal

Post #3 by mustang6 » Sun Feb 18, 2018 4:06 am

Ryan, either use a spare input shaft from a different driveline or go to a local auto parts store and get a transmission tailshaft plug. They sell them for a few bucks each and they seal the tailshaft against leaks until you get it installed. Once installed, slip the plug out and your driveshaft in and you should have no leaks.

Image
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

User avatar
B RON CO
VIP Member
Posts: 677
Joined: Tue Apr 05, 2016 7:02 pm
Location: Long Island, NY
Contact:

Re: Possible bad rear tranny seal

Post #4 by B RON CO » Sun Feb 18, 2018 8:18 am

Hi, X2. Check the fluid with the tranny in the car. They always drip when you pull the driveshaft. If the rear seal still leaks after you drive it it is easy to change later. Good luck
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

User avatar
StarDiero75
Registered User
Posts: 428
Joined: Tue Jun 13, 2017 9:39 pm

Re: Possible bad rear tranny seal

Post #5 by StarDiero75 » Sun Feb 18, 2018 1:18 pm

Howdy guys

Thanks a lot for the info! I almost started digging out the seal but you all saved me haha. Ill be putting it in soon, and that plug is a good idea.

Thanks again!
Ryan
--1965 Ranchero w/1966 200 and 3.03 column shift, 8" rear 2.8 (Yes I know the gearing sucks), weber 32/36, CRT Performance HEI.
--1961 Studebaker Lark VI, OHV 170 l6 in the process of being resurrected. But it lives
--Creator of the only Weber 32/36 conversion video.

Who is online

Users browsing this forum: Google [Bot] and 5 guests