D@mnit!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NorthWolf33 · 01-28-2005, 09:48 PM

So I was drivin' home from college and about an hour from home I blew the front seal on my tranny. I have a 90 Blazer with the 700R4 in it, atleast Im pretty sure thats whats in it. but anyways I obviously dumped the fluid and burned the tranny up.....DAMNIT! so ya Im gonna take it out myself and take it somewhere to be rebuilt since I dont know too much about transmissions....soooo my question is...is there anything they can do when they rebuild it to kind of boost it and make it stronger and more efficient like a trans go kit or something? or is there a tranny I can buy that is stronger and more efficient? in the future I plan on making my Blazer for pure off road so I figured while Im doin tranny work might as well get it beefed up if I can, but for now its still goin to be a daily driver? Thanx for any help.

P.S. I was readin somewhere about transfer case stuff and someone talked about transfer case clocking....what is this?

NorthWolf33 · 01-28-2005, 11:04 PM

ok so ya maybe a pic will help of my journey home....

**kwmech** · 01-28-2005, 11:29 PM

Sure it wasn't just a line? The trans should not have 'burned up' unless you have a bunch of miles on it and was on its way out anyways.

NorthWolf33 · 01-28-2005, 11:37 PM

well I got it with 172000 on it and it was at 192000 when it dumped and at the rate in which it was coming out I dont think its a line cause it was comin out like a waterfall and when I pulled the dipstick it smelt burnt along with the fluid smelling burnt.

*1FaastC10* · 01-29-2005, 12:08 AM

there is no way it was anything other than a line, unless you hit something. if it were a seal or gasket going bad you would've noticed a leak a long time ago.

NorthWolf33 · 01-29-2005, 12:38 AM

oh well ya it was leakin but the whole time I thought it was just a leaky line up somewhere I couldnt see so I just always checked the fluid and kept it full.

NorthWolf33 · 01-29-2005, 02:55 AM

ok scratch that I thought its a 700r4.....cause after doin some research and according to the pan diagram....its a TH350....dont know why the guy told me a 700r4 because my pan looks nothing like that but its exactly like a 350 so its a TH350....so is it worth it and "do-able" to put in a TH700R4?

Hoods69BadBowTie · 01-29-2005, 03:18 AM

I would stay with the TH350 but that is just my opinion. You can upgrade some stuff but I am not to sure about it?
-LAter

**VetteVet** · 01-31-2005, 01:26 AM

You can buy about three 350s for what a beefed up 700r4 will cost you. The only advantage with the r4 is the overdrive for gas mileage. Go to TCI.com for beefed up 350s and check Bowtie overdrives for r4s. If you search the web for these two trannys you can find enough to keep you busy reading for a couple of days. Be sure the torque converter is flushed out or you may contaminate the new tranny. I think if it were me I'd Have the 350 rebuilt and use it.
Hope this helps
VetteVet

muddobber40 · 01-31-2005, 02:42 AM

Umm..an easier way to tell 350 from 700 is if you have overdrive..Aslo, on t-case clocking..they sell spacer/adapters that allow you to turn the t-case up/ down, up in most cases, for better ground clearance on off road vehicles.

NorthWolf33 · 01-31-2005, 03:37 PM

ya Ive got overdrive.....but the pan doesnt look like the 700r4 at all

NorthWolf33 · 01-31-2005, 03:43 PM

I also found somewhere that if I bring them jsut the transmission they will rebuild it for 800....which sounds pretty good....how hard is it though to rebuild a tranny yourself? or if I bring it to them can they beef it up for me?

muddobber40 · 01-31-2005, 04:23 PM

350's don't have OD. IF you have never rebuilt a tranny, I suggest not trying to unless you have a friend that has to help you. They can beef it to whatever extent you want, just a matter of money.

http://www.nastyz28.com/transid.html this link has some good info on identification

NorthWolf33 · 01-31-2005, 04:33 PM

haha and on that note....F$#K what tranny do I have?

Destructo · 01-31-2005, 04:35 PM

Quote:

Originally Posted by NorthWolf33

ya Ive got overdrive.....but the pan doesnt look like the 700r4 at all

Only difference between a 700r4 pan and th350 pan is the th350 pan has one corner cut off, the 700r4 pan is square.

And if you have automatic and Overdrive then you have a 700r4, but its possible somebody put a th350 in there and left the old shifter pattern in the dash.

The only sure fire way is to look at the pan, square with one corner cut off is a th350, just square is a 700r4.

You could have run the transmission hot and it will puke out all the fluid, if your torque converter is not locking up it will smoke the tranny because it gets too hot and blow all the fluid out. But the front seal could have blown out causing lots of fluid to come out, or a cooler line came apart, you should be able to check the lines without pulling the transmission. If a line came apart fix it, fill er up with fluid and see what happens, just because you lost all that fluid doesn't mean the tranny is gone, I'v seen many transmissions dump almost all the fluid out then be fine after filled back up. I overheated a TH400 once in a K20 and it puked all the fluid out, unloaded my trail rig, took a trip to the store a couple miles away filled her up and it worked fine, even after being overheated, we put a Big tranny cooler on it after that, the reason it overheated was because I was only running like 35mph and towing a heavy load and th400s don't have lockup, and I should have been running 2nd gear to keep the rpm higher so the converter wasn't slipping so much.

And just out of curiosity, why is your crossmember lowered? You don't have enough lift for it to be lowered really, and that looks like a 700r4 crossmember to me.

NorthWolf33 · 01-31-2005, 04:37 PM

1990 Chevy Full Size Blazer with the 350 small block in it.....700r4 tranny?

Destructo · 01-31-2005, 04:40 PM

Quote:

Originally Posted by NorthWolf33

1990 Chevy Full Size Blazer with the 350 small block in it.....700r4 tranny?

If the tranny has never been replaced its going to be a 700r4, I can gurantee that, they never offered a th350 in a 1990 truck.

NorthWolf33 · 01-31-2005, 04:46 PM

its lowered because for some odd reason...still boggles my mind to this day....somethin under would grind to hell whenever I coasted like to come to a stoplight or something and when I lowered it....it stopped that. I know it shouldn't have needed it but I took it somewhere and they thought the driveshaft angle was too great...(the guy was inexperienced on trucks though)...so you got me...but I did it and it helped...my rear lift blocks are angled too so the drive shaft isnt binding on the diff...to find the noise one day I jacked up my truck and put it in gear and the sound was coming from right at the end of the tranny somewhere around the yoke....and thanx for the hlep with the tranny....because I definitely know its got overdrive....and right now Im at school and its sittin broke at home...so I cant go out and get a thorough look at it....

NorthWolf33 · 01-31-2005, 04:47 PM

haha anyone up for a chem test with me in about an hour?...gotta love college

NorthWolf33 · 01-31-2005, 04:53 PM

so if its a seal.....then Ill prolly need a rebuild but if was somethin simple....I might be able to fill it up and drive even though the tranny fluid definitely smelt and was burnt? if I fill it up and its still crap either way I would all ready need a rebuild right?

ozrulzk5 · 02-04-2005, 12:22 AM

nope. if the front seal has blown out then chances are ya gonna have to replace the front pump and t/c. If ya gotta do all that then ya might as well have the whole thing gone thru. mine did the same thing but the only unlucky one was the guy behind me riding my a$$. LOL I dropped into second stomped it and I sprayed him with every drop of tranny fluid I had. last saw him pulling off the road (prob to clean the windshield) lucky for me I was close to the house and coasted into the driveway. bet he wont tailgate anymore!!!!

silveroddo · 02-07-2005, 01:31 AM

about three years ago one of my trucks did the same thing, its a 90 k-1500
4x4 w/a 700r4. I was mudding, must of heated it up or somthing and blew out the front seal, on the way back still didn't know anything was wrong then noticed/smelled burning ATF, which was dripping on the exhaust pipe, pulled over and though I had a broken line. Upon further investigation found it was dripping from the little hole in the bottom of the bellhousing plate.After going though a case ( Yes a CASE) of ATF in 40 milesto get it home I ended up pulling the tranny, getting a speedy sleave for the front shaft and replaced the seal, that was about 10k miles ago and the tranny is still going great (knock on wood, the way my luck goes it'll take a dump tomorrow though just cause I said that)
Anyway, thats my limited experience with that kind of problem, fill it up and take it for a drive, if the tranny is slipping and getting problematic or the fluid is burnt/black then you'll be looking at a rebuild, but if it seems fine just, looseing alot of ATF then you might get lucky.

And just a quick piece of info, in 90 some of the personal duty 2500's (6-bolt) came with TH350's, we've got a 90 k-2500 with a 305 and th350, thats the way it came from the factory.

NorthWolf33 · 02-09-2005, 04:05 AM

cool thanx...Im thinking about just replacin the front seal and fillin it back up in hopes that it works....and just wont take it any significant distance for awhile....and I for sure have the 700r4 cause I checked when I went home this weekend. Thanx for all the help.

arkracing · 02-09-2005, 10:06 AM

Quote:

Originally Posted by 1FaastC10

there is no way it was anything other than a line, unless you hit something. if it were a seal or gasket going bad you would've noticed a leak a long time ago.

had a 700R4 in a '38 chevy street rod.
doing 80 on the highway - blew the front seal, tranny fluid all over the exahust, truck, highway etc.

note...very dangerous situation as tranny fluid is very flamable and ignites quickly.

had to have the tranny rebuilt.

note: if you have it rebuilt - have them drill the return hole slightly bigger to relive pressure from the front seal area - i guess it is right around that area and the later model trannys '90 would be one have a small return hole that if the converter is not locked up - it will build too much pressure in the tranny.
the other thing they can do is put a "retainer" type device on the outside of the front seal. which will prevent it from completly blowing out - if there is enough pressure it will blow by the seal but shouldn't blow it out of the tranny. (at least that is what my tranny guy said)
both of those were done to the tranny in the '38 chevy and it has been running for over 4 years like that now.

$800 is a decent price for a 4x4 700r4. they are very expensive to rebuilt...especially the 4x4 ones.

01-28-2005, 09:48 PM	#1
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	D@mnit!!! So I was drivin' home from college and about an hour from home I blew the front seal on my tranny. I have a 90 Blazer with the 700R4 in it, atleast Im pretty sure thats whats in it. but anyways I obviously dumped the fluid and burned the tranny up.....DAMNIT! so ya Im gonna take it out myself and take it somewhere to be rebuilt since I dont know too much about transmissions....soooo my question is...is there anything they can do when they rebuild it to kind of boost it and make it stronger and more efficient like a trans go kit or something? or is there a tranny I can buy that is stronger and more efficient? in the future I plan on making my Blazer for pure off road so I figured while Im doin tranny work might as well get it beefed up if I can, but for now its still goin to be a daily driver? Thanx for any help. P.S. I was readin somewhere about transfer case stuff and someone talked about transfer case clocking....what is this?

01-28-2005, 11:04 PM	#2
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	ok so ya maybe a pic will help of my journey home.... Attached Images

01-29-2005, 03:18 AM	#8
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	I would stay with the TH350 but that is just my opinion. You can upgrade some stuff but I am not to sure about it? -LAter __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

01-31-2005, 01:26 AM	#9
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	You can buy about three 350s for what a beefed up 700r4 will cost you. The only advantage with the r4 is the overdrive for gas mileage. Go to TCI.com for beefed up 350s and check Bowtie overdrives for r4s. If you search the web for these two trannys you can find enough to keep you busy reading for a couple of days. Be sure the torque converter is flushed out or you may contaminate the new tranny. I think if it were me I'd Have the 350 rebuilt and use it. Hope this helps VetteVet __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

01-28-2005, 11:29 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,650	Sure it wasn't just a line? The trans should not have 'burned up' unless you have a bunch of miles on it and was on its way out anyways.

01-28-2005, 11:37 PM	#4
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	well I got it with 172000 on it and it was at 192000 when it dumped and at the rate in which it was coming out I dont think its a line cause it was comin out like a waterfall and when I pulled the dipstick it smelt burnt along with the fluid smelling burnt.

01-29-2005, 12:08 AM	#5
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	there is no way it was anything other than a line, unless you hit something. if it were a seal or gasket going bad you would've noticed a leak a long time ago.

01-29-2005, 12:38 AM	#6
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	oh well ya it was leakin but the whole time I thought it was just a leaky line up somewhere I couldnt see so I just always checked the fluid and kept it full.

01-29-2005, 02:55 AM	#7
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	ok scratch that I thought its a 700r4.....cause after doin some research and according to the pan diagram....its a TH350....dont know why the guy told me a 700r4 because my pan looks nothing like that but its exactly like a 350 so its a TH350....so is it worth it and "do-able" to put in a TH700R4?

01-31-2005, 02:42 AM	#10
muddobber40 Registered User Join Date: Sep 2004 Location: Cadmus, KS Posts: 31	Umm..an easier way to tell 350 from 700 is if you have overdrive..Aslo, on t-case clocking..they sell spacer/adapters that allow you to turn the t-case up/ down, up in most cases, for better ground clearance on off road vehicles.

01-31-2005, 03:37 PM	#11
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	ya Ive got overdrive.....but the pan doesnt look like the 700r4 at all

01-31-2005, 03:43 PM	#12
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	I also found somewhere that if I bring them jsut the transmission they will rebuild it for 800....which sounds pretty good....how hard is it though to rebuild a tranny yourself? or if I bring it to them can they beef it up for me?

01-31-2005, 04:23 PM	#13
muddobber40 Registered User Join Date: Sep 2004 Location: Cadmus, KS Posts: 31	350's don't have OD. IF you have never rebuilt a tranny, I suggest not trying to unless you have a friend that has to help you. They can beef it to whatever extent you want, just a matter of money. http://www.nastyz28.com/transid.html this link has some good info on identification

01-31-2005, 04:33 PM	#14
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	haha and on that note....F$#K what tranny do I have?



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01-31-2005, 04:37 PM	#16
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	1990 Chevy Full Size Blazer with the 350 small block in it.....700r4 tranny?

01-31-2005, 04:46 PM	#18
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	its lowered because for some odd reason...still boggles my mind to this day....somethin under would grind to hell whenever I coasted like to come to a stoplight or something and when I lowered it....it stopped that. I know it shouldn't have needed it but I took it somewhere and they thought the driveshaft angle was too great...(the guy was inexperienced on trucks though)...so you got me...but I did it and it helped...my rear lift blocks are angled too so the drive shaft isnt binding on the diff...to find the noise one day I jacked up my truck and put it in gear and the sound was coming from right at the end of the tranny somewhere around the yoke....and thanx for the hlep with the tranny....because I definitely know its got overdrive....and right now Im at school and its sittin broke at home...so I cant go out and get a thorough look at it....

01-31-2005, 04:47 PM	#19
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	haha anyone up for a chem test with me in about an hour?...gotta love college

01-31-2005, 04:53 PM	#20
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	so if its a seal.....then Ill prolly need a rebuild but if was somethin simple....I might be able to fill it up and drive even though the tranny fluid definitely smelt and was burnt? if I fill it up and its still crap either way I would all ready need a rebuild right?

02-04-2005, 12:22 AM	#21
ozrulzk5 What can I do next ???? Join Date: Jan 2005 Location: Birmingham, Alabama 35126 Posts: 59	nope. if the front seal has blown out then chances are ya gonna have to replace the front pump and t/c. If ya gotta do all that then ya might as well have the whole thing gone thru. mine did the same thing but the only unlucky one was the guy behind me riding my a$$. LOL I dropped into second stomped it and I sprayed him with every drop of tranny fluid I had. last saw him pulling off the road (prob to clean the windshield) lucky for me I was close to the house and coasted into the driveway. bet he wont tailgate anymore!!!!

02-07-2005, 01:31 AM	#22
silveroddo Registered User Join Date: Mar 2003 Posts: 10	about three years ago one of my trucks did the same thing, its a 90 k-1500 4x4 w/a 700r4. I was mudding, must of heated it up or somthing and blew out the front seal, on the way back still didn't know anything was wrong then noticed/smelled burning ATF, which was dripping on the exhaust pipe, pulled over and though I had a broken line. Upon further investigation found it was dripping from the little hole in the bottom of the bellhousing plate.After going though a case ( Yes a CASE) of ATF in 40 milesto get it home I ended up pulling the tranny, getting a speedy sleave for the front shaft and replaced the seal, that was about 10k miles ago and the tranny is still going great (knock on wood, the way my luck goes it'll take a dump tomorrow though just cause I said that) Anyway, thats my limited experience with that kind of problem, fill it up and take it for a drive, if the tranny is slipping and getting problematic or the fluid is burnt/black then you'll be looking at a rebuild, but if it seems fine just, looseing alot of ATF then you might get lucky. And just a quick piece of info, in 90 some of the personal duty 2500's (6-bolt) came with TH350's, we've got a 90 k-2500 with a 305 and th350, thats the way it came from the factory.

02-09-2005, 04:05 AM	#23
NorthWolf33 Registered User Join Date: Jun 2004 Posts: 80	cool thanx...Im thinking about just replacin the front seal and fillin it back up in hopes that it works....and just wont take it any significant distance for awhile....and I for sure have the 700r4 cause I checked when I went home this weekend. Thanx for all the help.

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