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#1 |
Registered User
![]() Join Date: Sep 2012
Location: Factory
Posts: 681
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Trans leak
TH400 was peeing on the street. (Other Chevy's get the garage and driveway). So.......I broke down and replaced the pan seal. It wasn't sludgey at all and no metal shavings. Now, skip a head three weeks to the present. Yup, you guessed it....5 inch circle directly under the tail shaft.
Delima..... Pull drive shaft and replace another seal on what seems to be a great TH400? Or throw a pan under it for a few months as to scrounge a couple thousand and go for a 700r4 swap? Keeping in mind I have a 72 Dana 60 w/ 4.10:1. TH400 turn 3000+ at 65mph and I want a 4 gear bad. ![]() Posted via Mobile Device |
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#2 | |
Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: Trans leak
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#3 |
Registered User
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Location: Factory
Posts: 681
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Re: Trans leak
I'm definitely going to throw some Lucas down the tube. I think I'm just looking for someone to push me over the edge to go and do the trans swap. LOL
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#4 | |
Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Trans leak
Quote:
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#5 |
Registered User
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Location: Factory
Posts: 681
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Re: Trans leak
I'm going to call around tomorrow. I want to see if I can find a built 700r4, installed to include torque converter, driveshaft, TV cable, lockup and cooler for under $2000.
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#6 |
Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Trans leak
I've had 2 700R4 transmissions in my other trucks. They were a 84 and 87 short bed trucks. Bought mine built and ready to go. I installed myself. I will use the same company again this time around for my 72.
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#7 |
Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: Trans leak
I'm not much of an additive guy, but I'll be damned if this stuff didn't work
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#8 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Trans leak
recommend bowtie overdrives up in Hesperia http://www.bowtieoverdrives.com/index.shtml
Trans will be under $2000, with the other stuff you mentioned, $2K will be ball park. Have you considered a 2004R? That is the route I plan to eventually go. If you have a C20, am guessing you have a 4.10-ish rear end? Think "useful 1st gear final drive coupled to a 4.10" and the 2004R might be a little more streetable - and either can be built to be sturdy for a 3/4 ton truck. Here's what I'm talkin about (if you have a different rear gear, let me know and I can post that): (Don't get me wrong, 700R4 is a great route also - but less deep 1st and slightly more o/d exists in the 2004R, that's all) |
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#9 |
Registered User
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Location: Factory
Posts: 681
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Re: Trans leak
I have considered the 200-4r. It's practically the same length of the TH400. No real drive shaft work. Only have to swap out the slip yokes. They just seem to be harder to come by. Most are BOP bolt pattern and built for 3800 engines. I am looking to get trans and installation for $2k. Bowtieoverdrives wants that just for the transmission itself.
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#10 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Trans leak
actually, their level 1 2004R is $1195 and their level 2 is $1395. Not bad. I'd opt for the level 2. Level 3 is more of a race trans. 2 is just beefed up with some stronger parts.
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#11 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Trans leak
Oops - my bad - sorry about that - missed that you wanted installation included. You are correct, price would be higher. I'm on the fence if I will install my own - prefer to install it myself (somewhat enjoy transmission work, strangely) but it voids the warranty if I don't take it to them to check line pressure (i.e. on a trailer) before I drive it if I install it myself. So if I'd have to take it there to keep the warranty valid, I might as well have them do it, as much as it pains me. Haven't decided yet though. Won't be living here forever, so the warranty may be worthless to me. Just want to make sure I have the TV set correctly so I don't fry it.
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#12 | |
Registered User
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Location: Factory
Posts: 681
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Re: Trans leak
Quote:
There is no shortage of transmission shops here in Los Angeles. I may need an interpreter to get the price I need though. |
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#13 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,624
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Re: Trans leak
It's dripping off the tailshaft, but maybe the leak is somewhere else. ATF is very thin, especially when hot, and will travel to a low spot and drip off there. Before you replace the rear seal -- or swap out the trans -- try to pinpoint the leak. With luck, it could be something as minor as the dipstick o-ring.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#14 | |
Registered User
![]() Join Date: Sep 2012
Location: Factory
Posts: 681
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Re: Trans leak
Quote:
Keep messing around Stocker and you will talk me into keeping the TH400. Always has been a favorite transmission. They don't seem to break easy. But if I kept it.....I would want to go with a higher rearend gear. |
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#15 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,624
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Re: Trans leak
Quote:
I've only had one TH400, a long time ago in a '69 El Camino. It got beat on pretty hard at times, didn't break the trans but I did manage to twist the output shaft. Dumb kids anyway.... ![]()
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#16 |
Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Trans leak
I set both of my TV cables on the ones I installed. Never had a problem. Just make sure and spend the extra money for the correct carb bracket so everything lines up with the TV cable and carb linkage
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Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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#17 | |
Registered User
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Location: Factory
Posts: 681
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Re: Trans leak
Quote:
I just bought a 72 style accelerator pedal and one of the LFD cable linkage for my throttle. I have a 69 block with a 74 Corvette carb. (Don't know how or why) So, I would have to figure out the TV cable part. |
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#18 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Trans leak
If it is the rear seal, replacement is easy as well. Since you have a th400, you have a slip yoke that slides right off. Use a flat blade screwdriver to pry the seal off as shown below, and tap a new one in place. Check the yoke for a groove worn into it while you have it out.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#19 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Trans leak
Rear trans seal for a Turbo 400 is NATIONAL Part # 7038SA. It will run you about 5 bucks from a parts store.
The fellow above showed a nice diagram of how to change it. |
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#20 |
Registered User
![]() Join Date: Sep 2012
Location: Factory
Posts: 681
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Re: Trans leak
My big debate with myself has been keep the TH400 and swap to a 3.54 posi
Or...New 700r4 and keep 4.10's in the Dana 60. Both probably cost $1500-$2000 (I think) |
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