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Username Post: 700R4 Leaks 241 seems to be full?        (Topic#354807)
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-11-19 02:28 PM - Post#2757133    

My 1991 V1500 Suburban with 350 TBI, 700R4 and 241C just started leaking trans fluid. Didn't look like it was coming from the bell housing so I washed the back of the engine, transmission and transfer case and ran it in the drive.....no leaks. Then I ran it on the road and it leaks quit nicely. Looked like it was coming from the top of the trans, maybe from the transfer case vent line but could not be sure. Opened the transfer case fill plug and it seems to be full as in overfull as tons of fluid came gushing out. Question #1...Can fluid transfer from trans to transfer case? If so, #2 What would I look for to fix it? Thanks



 
junkman104 
Frequent Contributor
Posts: 1327
junkman104
Age: 59
Loc: Murphy N.C.
Reg: 01-25-14
01-12-19 04:36 AM - Post#2757176    
    In response to ballencd

Question #1 yes

Question #2 transfer case input seal. Means remove the transfer case and replace the seal.



 
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-12-19 07:26 AM - Post#2757180    
    In response to junkman104

Thank you for the response. I guess its time for me to learn how to do that. I replaced the rear transfer case seal in my 88 Suburban a few years ago and it wasn't hard. Anything I should look specifically for other then any damage to the shaft?
Thanks again
Charlie



 
junkman104 
Frequent Contributor
Posts: 1327
junkman104
Age: 59
Loc: Murphy N.C.
Reg: 01-25-14
01-13-19 05:27 AM - Post#2757249    
    In response to ballencd

Nope that is about it, the 241 has a bearing retainer that holds the seal and unbolts from the case. Makes putting in a new seal easy.





 
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-14-19 09:59 AM - Post#2757330    
    In response to junkman104

Do I remove the adaptor with the transfer case or leave it on the transmission?




 
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-14-19 12:29 PM - Post#2757347    
    In response to ballencd


OK....I got the transfer case out and the space within the adapter was not full of transmission fluid......How can that be???.... the transfer case was overfull, the transmission was low and fluid was blowing out the transfer case vent and there was no fluid (maybe a tablespoons worth dripped out when I separated it).

Any idea where I go from here? I'm thinking that it wouldn't flow out of the adapter into the transfer case sitting in the drive. The rear transmission seal is almost 6" from the transfer case input seal so the oil would have to be in-between them....right?



 
junkman104 
Frequent Contributor
Posts: 1327
junkman104
Age: 59
Loc: Murphy N.C.
Reg: 01-25-14
01-14-19 06:12 PM - Post#2757381    
    In response to ballencd

Unless someone has the transmission vent connected to the transfercase vent its the only way they would transfer. Do you park on a grade nose up? Level ground here is hard to find.



 
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-14-19 07:23 PM - Post#2757386    
    In response to junkman104

I don't see a transmission vent at all. I did start the engine with the transfer case out and put it in gear and got a fine stream of ATF out of the transmission seal directly into the adapter.
I am going to replace both the transfer case seal and transmission seal and put it back in. I still don't understand where the fluid went that got sprayed into the void in the adapter when I found it empty when I pulled it apart.....I am so confused.





 
gchemist 
Senior Chevytalk Moderator
Posts: 24622
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-15-19 06:52 AM - Post#2757428    
    In response to ballencd

ballencd,
Have you taken any pictures? Pictures would be helpful. I've never seen a 241C taken apart.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
ballencd 
Poster
Posts: 8

Loc: Columbus, NC
Reg: 01-09-19
01-15-19 04:37 PM - Post#2757488    
    In response to gchemist

I thought I had taken several pictures of the front of the 241C but I can not find them! : (

The front of the transfer case had a 4 bolt flange with a double sided seal. The seal had a spring on each side which was different then I have seen before. The flange was simple to remove and simple to press out the old seal because I could get to both sides. I did warm up the flange and freeze the seal to get it started straight on the re-install as it was a very tight fit.

Apparently I have to pay to add pictures to this post so the ones I do have will not get uploaded. Sorry about that.

The transfer case is back in now. I replaced the seal on the input of the transfer case only. I did put some (small amount) silicone sealant around the outside edge of the input flange and another bigger bead on the outside flange of the adapter to transfer case seat. It's filled with ATF and seems to be running fine. I plan on draining the trans and putting in a new filter but didn't want to muddy the waters with my first issue. It was a messy job on a gravel drive but not terribly hard.

It turned out that neither the 350 or 700R4 transmission have output shaft seals in them (at least when configured with a transfer case). The transmission seems to squirt ATF into the adapter to lubricate the speedo gears and then drains back into the transmission. The seal in the front of the transfer case is there to stop ATF swapping between the transfer case and the transmission. In my case the ATF was passing through the adapter and past the transfer case seal and when full it blew out the transfer case vent. Messy.

Thanks for the help.




 
Keith_Knox 
Moderator and "17th Year" Gold Supporting Member
Posts: 6098
Keith_Knox
Age: 77
Loc: Napa, Ca USA
Reg: 04-02-00
01-16-19 10:33 AM - Post#2757539    
    In response to ballencd

You do not have to pay to post pictures on ChevyTalk. You do have to use a host site if you are not a supporting member of ChevyTalk.

http://www.chevytalk.org/fusionbb/showforum.php?fi... Posting photos by Tony

29-41, 42-48, 49-54 Moderator
1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966.
1946 Chevy 1/2 ton pickup, stock. Purchased 11/18/17.
1962 Ranchero Purchased 4/2017 221 V8 Auto. Sold 9/20/18
2013 F150


 
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