700r4 trouble - Pirate4x4.Com : 4x4 and Off-Road Forum

YJ-GENRAL · 03-22-2011, 05:42 PM

very new to Auto trannys and put one in my YJ last year, had a few runs with it so far and its not bad, its behind a 305 with TPI. 700 came out of a 89 chevy blazer.

i am having trouble with it... it doesnt want to pull bearly at all and its leaking out the back

here is a pic of the output shaft (which wiggles pretty easily, not sure if its suppose to do that or not) its draining pretty seriously right at the bottom where there is a hole going to the driver side, the outside of the tranny has a press on dome, not sure what that is or what it does either... again i am very new to auto trannys

please help me out here, i have only dealt with manual trannys up till now...

MaxPF · 03-22-2011, 11:58 PM

Quote:

Originally Posted by YJ-GENRAL

very new to Auto trannys and put one in my YJ last year, had a few runs with it so far and its not bad, its behind a 305 with TPI. 700 came out of a 89 chevy blazer.

i am having trouble with it... it doesnt want to pull bearly at all and its leaking out the back

here is a pic of the output shaft (which wiggles pretty easily, not sure if its suppose to do that or not) its draining pretty seriously right at the bottom where there is a hole going to the driver side, the outside of the tranny has a press on dome, not sure what that is or what it does either... again i am very new to auto trannys

please help me out here, i have only dealt with manual trannys up till now...

I cant tell shit from that pic. it's the output shaft driving the governor gear, but I dont see the hole you are talking about.

Anyway, basics: Is the fluid level ok? I asked since you mentioned it was leaking...

YJ-GENRAL · 03-23-2011, 06:30 AM

he hole is below the gear to the left, you can see the ATF flowing out of it.

the ATF is coming out of there and was leaking from the seal around the Tcase

when i opened the top fill plug in the Tcase before removing to check its level first at least a quart of ATF came poring out of it, meaning that the ATF was leaking from the tranny and filling up the Tcase way above the fill level, then leaking out excess through the mating surface.

on my last trip the ATF was getting low so i topped it off and yesterday it was about a half quart low again.

i have been told it could be many reasons why it wont pull, torque converter or the clutch packs etc.

i want to avoid a rebuild as its kinda expensive and the tranny prolly isnt worth the cost....

that help any?

YJ-GENRAL · 03-23-2011, 03:22 PM

so i got home and was checking it out more, took the pan off and shined a light from the tail end and the hole goes straight into the pan, must be an overflow or something? not sure.

going to try and take the tranny out tonight. might have a good torque converter if the splines are the same from a neighbor that i can try out.

any ideas why it wont pull? just generic auto tranny stuff might help me out right now. thanks in advance.

Greg Ducato · 03-23-2011, 03:39 PM

There is no seal in that part of the case, the only seal is at the transfer case input. There is an o-ring from the trans case to transfer case adapter, and another o-ring on the governor cover. Take a really good look at the case all around the tail end of the trans, these are bad about cracking in the rear part of the case from twisting.

YJ-GENRAL · 03-23-2011, 03:44 PM

also if it helps... in the pan there was quite a bit of black sludge atleast 1mm thick and the filter looked extremely black, could a stuck filter cause this kinda of problem?

Swoop69 · 03-23-2011, 03:49 PM

autos have to have fluid to move... so if the filter is blocked, you wont have any movement.

the bigger question then becomes, where did the black sludge come from? Most of the time it is from the clutch packs burning or disintegrating...

Im no 700r4 expert, but my acura is in the shop right now for the exact same thing. the clutches fell apart, plugged the filter, and the car would barely move.

CtChevy · 03-23-2011, 04:50 PM

Sounds like you are going to be rebuilding this one, or finding a new one. but we will start with the easy stuff first. the reason your tcase is over full is because the input shaft seal is leaking causing fluid from the trans to get into the tcase so change that seal. second pull the studs on the tcase to trans mounting and make sure it is flat if its not this is whats causing the leak from around the tcase to trans mounting surface also check the adapter, usuall get messed up when someone uses a wiz wheel to clean the gasket off. on the same problem if it flat and clean make sure you use a gasket RTV will work but not the best and has always leaked on me.
Ok onto the Fun stuff, sound like to me you have a plugged filter, autos need fluid and presure to function properly. if its missing either the clutches wont hold and will burn up causing your black sudge issue in the pan. dont waste your time swapping converter you will just fill the new one with crap fluid and over stuff from the trans and ruin it to. take the trans out and bring it to a shop or get a manual and rebuild it. do a few upgrades and call it good. or just swap it out for a th350 or th400 can usually pick a good used one up for a few hundered bucks, at least i can around here.

YJ-GENRAL · 03-23-2011, 07:21 PM

i think im going to listen to you guys and just have a professional look at it.

went ahead and pulled the tranny from the jeep, ill call around tomorrow and see how much a bench rebuild is, im thinking about 300-400 for a complete rebuild...hopefully

wife isnt going to like that... plus its on her side of the garage ha! oh well shouldnt be down too long though.

and ill check into the input seal on the tcase while its out.

Swoop69 · 03-24-2011, 11:25 AM

Quote:

Originally Posted by YJ-GENRAL

i think im going to listen to you guys and just have a professional look at it.

went ahead and pulled the tranny from the jeep, ill call around tomorrow and see how much a bench rebuild is, im thinking about 300-400 for a complete rebuild...hopefully

wife isnt going to like that... plus its on her side of the garage ha! oh well shouldnt be down too long though.

and ill check into the input seal on the tcase while its out.

Usually $300-$400 for a rebuild KIT!

labor is going to put your total near a grand or more...

If you are needing to keep it cheap, look for a late 80's chevy truck with a 4wd 700r4 (half tons) that is being parted out, or wrecked or bad engine. If at all possible to drive, and check the fluid for brown color, and burnt smell.

sometimes you can get the whole truck for $300, drag it home, part it out you self, and sell the rest to the scrapyard. My brother and I did this on a 90 suburban. Pulled the engine, trans, transfer case and axles, then sold the doors, steering column and seats, then scrapped the rest...

After we took all the parts we wanted, not only did we recoup the $300, but made another $250.

YJ-GENRAL · 03-24-2011, 02:28 PM

yeh that $400 was hopeful...apparently its twice that. im looking into my options

YJ-GENRAL · 03-25-2011, 01:33 PM

found a guy who will do it on the side for $200 labor plus parts. so if i dont need a torque converter i can get it all done for alittle over $300 total!

Rinkrat456 · 03-25-2011, 01:50 PM

Would you change your oil without replacing the filter? Don't rebuild a tranny without replacing the torque converter. If your filter is plugged up with sludge I can guarantee the torque converter has the same shit in it.

YJ-GENRAL · 03-26-2011, 09:10 PM

gotcha. didnt think about that...

YJ-GENRAL · 03-29-2011, 05:57 AM

good times good times! my rebuilder backed out on me so im back on a search for someone to do this. i dont have the special tools to try and attempt this myself and not real confident in my ability to rebuild an auto tranny anywyas. i guess it will be sitting alittle while longer.

YJ-GENRAL · 03-29-2011, 05:59 AM

did i mention the allen bolts on the tcase input are so tight in there im probably going to have to drill them out? heh! one is so boogered up i can only get a screwdriver to fit and the other three are alright but i tried heating up one of the bolts and it started to bend the allen wrench it was so tight.

03-22-2011, 05:42 PM	#1 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	700r4 trouble very new to Auto trannys and put one in my YJ last year, had a few runs with it so far and its not bad, its behind a 305 with TPI. 700 came out of a 89 chevy blazer. i am having trouble with it... it doesnt want to pull bearly at all and its leaking out the back here is a pic of the output shaft (which wiggles pretty easily, not sure if its suppose to do that or not) its draining pretty seriously right at the bottom where there is a hole going to the driver side, the outside of the tranny has a press on dome, not sure what that is or what it does either... again i am very new to auto trannys please help me out here, i have only dealt with manual trannys up till now...

03-23-2011, 03:49 PM	#7 (permalink)
Swoop69 Learning by Mistakes Join Date: Aug 2010 Member # 165972 Posts: 917	autos have to have fluid to move... so if the filter is blocked, you wont have any movement. the bigger question then becomes, where did the black sludge come from? Most of the time it is from the clutch packs burning or disintegrating... Im no 700r4 expert, but my acura is in the shop right now for the exact same thing. the clutches fell apart, plugged the filter, and the car would barely move. __________________ My 4 Door Jeepster Build... maybe... /forum/jeep-hardcore-tech/948857-4-door-jeepster-commando-build.html

03-25-2011, 01:50 PM	#13 (permalink)
Rinkrat456 Registered User Join Date: Mar 2007 Member # 88919 Posts: 757	Would you change your oil without replacing the filter? Don't rebuild a tranny without replacing the torque converter. If your filter is plugged up with sludge I can guarantee the torque converter has the same shit in it. __________________ [COLOR="Lime"][I]At 1300rpm's would you rather have 10 extra hp or 10 extra lb-ft of torque?[/I][/COLOR]

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03-23-2011, 06:30 AM	#3 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	he hole is below the gear to the left, you can see the ATF flowing out of it. the ATF is coming out of there and was leaking from the seal around the Tcase when i opened the top fill plug in the Tcase before removing to check its level first at least a quart of ATF came poring out of it, meaning that the ATF was leaking from the tranny and filling up the Tcase way above the fill level, then leaking out excess through the mating surface. on my last trip the ATF was getting low so i topped it off and yesterday it was about a half quart low again. i have been told it could be many reasons why it wont pull, torque converter or the clutch packs etc. i want to avoid a rebuild as its kinda expensive and the tranny prolly isnt worth the cost.... that help any?

03-23-2011, 03:22 PM	#4 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	so i got home and was checking it out more, took the pan off and shined a light from the tail end and the hole goes straight into the pan, must be an overflow or something? not sure. going to try and take the tranny out tonight. might have a good torque converter if the splines are the same from a neighbor that i can try out. any ideas why it wont pull? just generic auto tranny stuff might help me out right now. thanks in advance.

03-23-2011, 03:39 PM	#5 (permalink)
Greg Ducato Newbie Join Date: Apr 2010 Member # 158798 Location: Weatherford Texas Posts: 44	There is no seal in that part of the case, the only seal is at the transfer case input. There is an o-ring from the trans case to transfer case adapter, and another o-ring on the governor cover. Take a really good look at the case all around the tail end of the trans, these are bad about cracking in the rear part of the case from twisting.

03-23-2011, 03:44 PM	#6 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	also if it helps... in the pan there was quite a bit of black sludge atleast 1mm thick and the filter looked extremely black, could a stuck filter cause this kinda of problem?

03-23-2011, 04:50 PM	#8 (permalink)
CtChevy Granite Guru Join Date: Jan 2007 Member # 85204 Location: CT, AKA NO PLACE TO GO PLAY Posts: 534	Sounds like you are going to be rebuilding this one, or finding a new one. but we will start with the easy stuff first. the reason your tcase is over full is because the input shaft seal is leaking causing fluid from the trans to get into the tcase so change that seal. second pull the studs on the tcase to trans mounting and make sure it is flat if its not this is whats causing the leak from around the tcase to trans mounting surface also check the adapter, usuall get messed up when someone uses a wiz wheel to clean the gasket off. on the same problem if it flat and clean make sure you use a gasket RTV will work but not the best and has always leaked on me. Ok onto the Fun stuff, sound like to me you have a plugged filter, autos need fluid and presure to function properly. if its missing either the clutches wont hold and will burn up causing your black sudge issue in the pan. dont waste your time swapping converter you will just fill the new one with crap fluid and over stuff from the trans and ruin it to. take the trans out and bring it to a shop or get a manual and rebuild it. do a few upgrades and call it good. or just swap it out for a th350 or th400 can usually pick a good used one up for a few hundered bucks, at least i can around here.

03-23-2011, 07:21 PM	#9 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	i think im going to listen to you guys and just have a professional look at it. went ahead and pulled the tranny from the jeep, ill call around tomorrow and see how much a bench rebuild is, im thinking about 300-400 for a complete rebuild...hopefully wife isnt going to like that... plus its on her side of the garage ha! oh well shouldnt be down too long though. and ill check into the input seal on the tcase while its out.

03-24-2011, 02:28 PM	#11 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	yeh that $400 was hopeful...apparently its twice that. im looking into my options

03-25-2011, 01:33 PM	#12 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	found a guy who will do it on the side for $200 labor plus parts. so if i dont need a torque converter i can get it all done for alittle over $300 total!

03-26-2011, 09:10 PM	#14 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	gotcha. didnt think about that...

03-29-2011, 05:57 AM	#15 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	good times good times! my rebuilder backed out on me so im back on a search for someone to do this. i dont have the special tools to try and attempt this myself and not real confident in my ability to rebuild an auto tranny anywyas. i guess it will be sitting alittle while longer.

03-29-2011, 05:59 AM	#16 (permalink)
YJ-GENRAL Registered User Join Date: Feb 2008 Member # 109523 Location: cleveland, tn Posts: 68	did i mention the allen bolts on the tcase input are so tight in there im probably going to have to drill them out? heh! one is so boogered up i can only get a screwdriver to fit and the other three are alright but i tried heating up one of the bolts and it started to bend the allen wrench it was so tight.