Something wrong...feels expensive.... Need help - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jd21476 · 09-14-2013, 11:29 PM

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Other than the nasty fluid, the rear diff seems ok. Does it takes a gasket?
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jd21476 · 09-14-2013, 11:29 PM

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#2
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jd21476 · 09-14-2013, 11:39 PM

Ok, so who knows and trusts a transmission shop in San Diego?
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mrolds88 · 09-14-2013, 11:42 PM

Looks like tranny needs some help. Maybe trans pulled for some reason and when it went back in, converter wasn't seated properly. As for the rear, yes it takes a gasket, although folks have used RTV also.

INSIDIOUS '86 · 09-15-2013, 12:12 AM

Quote:

Originally Posted by jd21476

#2
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Is that brass? If so that's the main shaft bearings getting eaten alive. Mine is doing that but still has survived to this day. Mines way worse

That would be why it doesn't want to apply reverse. It's leaking internaly
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INSIDIOUS '86 · 09-15-2013, 12:13 AM

Quote:

Originally Posted by jd21476

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Other than the nasty fluid, the rear diff seems ok. Does it takes a gasket?
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Looks like a brand new posi to me. Add some fluid. And your good
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jd21476 · 09-15-2013, 12:15 AM

Can anyone tell what diff I have and how much fluid it takes?
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jd21476 · 09-15-2013, 12:16 AM

Quote:

Originally Posted by INSIDIOUS '86

Is that brass? If so that's the main shaft bearings getting eaten alive. Mine is doing that but still has survived to this day. Mines way worse

That would be why it doesn't want to apply reverse. It's leaking internaly
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So you think that much metal is an issue?
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mrolds88 · 09-15-2013, 12:44 AM

Diff is a 14 bolt. Not sure how much fluid. Good rear though.

**Corts60** · 09-15-2013, 09:15 AM

If that is in fact a posi, you need to add gear oil plus a 4oz. Bottle of friction modifier. And do not buy the pre-mixed stuff. It is not the same. Also, as for the gasket, I use a product called "the Right Stuff". It is what most OEM's are using as well instead of paper gaskets. Much better than RTV and you can use it right away.

All these things should be available at your local parts store.
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jjzepplin · 09-15-2013, 10:05 AM

Quote:

Originally Posted by jd21476

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#2
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This is also the diff I have. What is it? Do I need posi lube? Was told it was a locker...

willett · 09-16-2013, 01:10 AM

I tore the reverse band out of the case on my 400, did the same thing
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Tx Firefighter · 09-16-2013, 07:27 AM

The pictures in posts number 23 and 24 look like a Turbohydramatic 350 pan to me.
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legendman · 09-16-2013, 10:10 AM

Quote:

Originally Posted by Tx Firefighter

The pictures in posts number 23 and 24 look like a Turbohydramatic 350 pan to me.
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x2 pan with one corner cut off is a th350

here is a chart

legendman · 09-16-2013, 10:13 AM

Quote:

Originally Posted by jd21476

Can anyone tell what diff I have and how much fluid it takes?
Posted via Mobile Device

There is a plug on the right side where the driveshaft attaches, take the plug out dump in some 90wt gear oil till it starts to come out.

legendman · 09-16-2013, 10:16 AM

Quote:

Originally Posted by Corts60

Sorry brother, it's time to pull that tranny.

x2 it's on its way out, I had a th350 the same thing, a fluid change got me a few more miles but ultimately it ended up like this... totally smoked.

86c20 · 09-16-2013, 02:17 PM

capt. i think i see the problem. thats alot of metal in there. if it where me i would be looing for a well built 700. a 700 is a 400 with over but they where built cheap so they dont like power same as the dodge 47re. its a 727 with over. there are a few comps out there that will build a 700 well and they are not cheap but then again no trans is

mrolds88 · 09-16-2013, 02:27 PM

Quote:

Originally Posted by 86c20

capt. i think i see the problem. thats alot of metal in there. if it where me i would be looing for a well built 700. a 700 is a 400 with over but they where built cheap so they dont like power same as the dodge 47re. its a 727 with over. there are a few comps out there that will build a 700 well and they are not cheap but then again no trans is

4L80e is the turbo 400 with overdrive. 700 was used to replace the lighter duty (lighter duty than the 400) turbo 350.

jd21476 · 09-16-2013, 03:38 PM

Ok, so I've been getting quotes on a trans swap from the TH350 to a 700R4 of about $2400

Is that right?

86c20 · 09-16-2013, 05:39 PM

Quote:

Originally Posted by mrolds88

4L80e is the turbo 400 with overdrive. 700 was used to replace the lighter duty (lighter duty than the 400) turbo 350.

yea that would be the hd 350 i think gm called them 375. but then what is the 200r4 based off of? i was always told 700 was a 400 200 was a 350. or at least base off of them

tlawre87 · 09-16-2013, 06:43 PM

Quote:

Originally Posted by 86c20

yea that would be the hd 350 i think gm called them 375. but then what is the 200r4 based off of? i was always told 700 was a 400 200 was a 350. or at least base off of them

Its based off the Th200 or th250.. I can't remember. Essentially the little brother to the th350. My 79 nova (250 motor) has a Th250.

legendman · 09-16-2013, 07:05 PM

http://en.wikipedia.org/wiki/Turbo-Hydramatic

clinebarger · 09-16-2013, 07:23 PM

Quote:

Originally Posted by 86c20

yea that would be the hd 350 i think gm called them 375. but then what is the 200r4 based off of? i was always told 700 was a 400 200 was a 350. or at least base off of them

The HD version of a TH350 is called a TH375B, An extra friction in the Forward & Direct drum is the only difference worth mentioning. A light duty version called a TH250 also existed.

A TH375 is a light duty version of a TH400....Fewer clutches & 27 spline output. The HD version of the TH400 is a TH475/3L80-HD.

The 4L80E is based on a TH400.

The lower-end (Center support & down) of a 700R4 is the same as a TH350, The rest of the 700R4 is a "Clean sheet design". Though the front pump is a off shoot of a 2004R.

The 2004R is loosely based on the TH200, The Low/reverse, Direct, & Forward clutch assembles are a lot alike.

09-14-2013, 11:29 PM	#26
jd21476 Registered User Join Date: Aug 2013 Location: San Diego, CA Posts: 236	Re: Something wrong...feels expensive.... Need help Posted via Mobile Device Other than the nasty fluid, the rear diff seems ok. Does it takes a gasket? Posted via Mobile Device Attached Images __________________ 1973 Chevy K20

09-14-2013, 11:29 PM	#27
jd21476 Registered User Join Date: Aug 2013 Location: San Diego, CA Posts: 236	Re: Something wrong...feels expensive.... Need help Posted via Mobile Device #2 Posted via Mobile Device Attached Images __________________ 1973 Chevy K20

09-14-2013, 11:39 PM	#28
jd21476 Registered User Join Date: Aug 2013 Location: San Diego, CA Posts: 236	Re: Something wrong...feels expensive.... Need help Ok, so who knows and trusts a transmission shop in San Diego? Posted via Mobile Device __________________ 1973 Chevy K20

09-14-2013, 11:42 PM	#29
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Something wrong...feels expensive.... Need help Looks like tranny needs some help. Maybe trans pulled for some reason and when it went back in, converter wasn't seated properly. As for the rear, yes it takes a gasket, although folks have used RTV also. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

09-15-2013, 12:15 AM	#32
jd21476 Registered User Join Date: Aug 2013 Location: San Diego, CA Posts: 236	Re: Something wrong...feels expensive.... Need help Can anyone tell what diff I have and how much fluid it takes? Posted via Mobile Device __________________ 1973 Chevy K20

09-15-2013, 12:44 AM	#34
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: Something wrong...feels expensive.... Need help Diff is a 14 bolt. Not sure how much fluid. Good rear though. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

09-15-2013, 09:15 AM	#35
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Something wrong...feels expensive.... Need help If that is in fact a posi, you need to add gear oil plus a 4oz. Bottle of friction modifier. And do not buy the pre-mixed stuff. It is not the same. Also, as for the gasket, I use a product called "the Right Stuff". It is what most OEM's are using as well instead of paper gaskets. Much better than RTV and you can use it right away. All these things should be available at your local parts store. Posted via Mobile Device __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

09-16-2013, 01:10 AM	#37
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: Something wrong...feels expensive.... Need help I tore the reverse band out of the case on my 400, did the same thing Posted via Mobile Device __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"

09-16-2013, 07:27 AM	#38
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Something wrong...feels expensive.... Need help The pictures in posts number 23 and 24 look like a Turbohydramatic 350 pan to me. Posted via Mobile Device

09-16-2013, 02:17 PM	#42
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: Something wrong...feels expensive.... Need help capt. i think i see the problem. thats alot of metal in there. if it where me i would be looing for a well built 700. a 700 is a 400 with over but they where built cheap so they dont like power same as the dodge 47re. its a 727 with over. there are a few comps out there that will build a 700 well and they are not cheap but then again no trans is __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

09-16-2013, 03:38 PM	#44
jd21476 Registered User Join Date: Aug 2013 Location: San Diego, CA Posts: 236	Re: Something wrong...feels expensive.... Need help Ok, so I've been getting quotes on a trans swap from the TH350 to a 700R4 of about $2400 Is that right? __________________ 1973 Chevy K20



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