How do you tell when a rebuild is needed. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lyrikz · 05-11-2008, 08:21 AM

How do you tell when a transmission needs to be rebuilt?? I have a TH400 that im puttin in my truck. The vehicle i took it out of the tranny felt fine. I do need a different torque converter on it, (new cam on new motor) but what do i check inside the trans>???

i do have a book on its way on how to rebuild a TH400, but i was hoping i could get some advice.. Impatient on the book. ahah

89 crew · 05-11-2008, 08:42 AM

It depends on what you want from the trans. If you want perfection, rebuild it. If a minor leak is acceptable run it till there is a problem then rebuild.

HoupPhotography · 05-11-2008, 08:58 AM

Since you have a new motor, I would rebuild it, IMO, if the thanny leaks that is a problem. Take a little extra time to make sure you don't have any leaks, less headache, more drive time & less down time. If I'm going to do something, I try to do it once and be done.... but it doesn't always work that way....

Gray Ghost · 05-11-2008, 03:36 PM

Just had mine rebuilt....first sign is when the seals go and it's hard to engage when cold. Other signs are slippage in one gear or another or slow shifts.

lyrikz · 05-11-2008, 05:34 PM

Quote:

Originally Posted by Gray Ghost

Just had mine rebuilt....first sign is when the seals go and it's hard to engage when cold. Other signs are slippage in one gear or another or slow shifts.

I dont have any of those signs.... Im leaning towards the rebuild... Since im putting in a new torque converter and shift kit, i figured rebuilding it wouldnt hurt.

oldspowered · 05-11-2008, 06:26 PM

i think a trans rebuild is cheap insurance! that way you don't have to pull it back out 3 months down the road!

HoupPhotography · 05-11-2008, 08:52 PM

Quote:

Originally Posted by lyrikz

... Since im putting in a new torque converter and shift kit, i figured rebuilding it wouldnt hurt.

Just one more reason to rebuild it.....

stllookn · 05-11-2008, 09:06 PM

If it's out and you are rebuilding the engine...REBUILD IT! Especially if you are doing an engine upgrade, changing the TC and adding a shift kit. Gitterdun...LOL! You want to forget about it and not have to worry about it when you use the loud pedal!

sickchevy68cst · 05-12-2008, 08:17 AM

rebuild it cuz so far ive had to pull my friends 727 torqueflight out 5 times now we're pros at it

so get it out of the way so much easier than pullin it out every weekend

05-11-2008, 08:21 AM	#1
lyrikz PITbut Join Date: Sep 2007 Location: monroe washington Posts: 3,055	How do you tell when a rebuild is needed. How do you tell when a transmission needs to be rebuilt?? I have a TH400 that im puttin in my truck. The vehicle i took it out of the tranny felt fine. I do need a different torque converter on it, (new cam on new motor) but what do i check inside the trans>??? i do have a book on its way on how to rebuild a TH400, but i was hoping i could get some advice.. Impatient on the book. ahah

05-11-2008, 08:42 AM	#2
89 crew Registered User Join Date: Mar 2006 Location: Kansas Posts: 865	Re: How do you tell when a rebuild is needed. It depends on what you want from the trans. If you want perfection, rebuild it. If a minor leak is acceptable run it till there is a problem then rebuild.

05-11-2008, 08:58 AM	#3
HoupPhotography Registered User Join Date: Feb 2008 Location: Phoenix, Az Posts: 1,204	Re: How do you tell when a rebuild is needed. Since you have a new motor, I would rebuild it, IMO, if the thanny leaks that is a problem. Take a little extra time to make sure you don't have any leaks, less headache, more drive time & less down time. If I'm going to do something, I try to do it once and be done.... but it doesn't always work that way.... __________________ R.I.P. Scott Kalitta

05-11-2008, 03:36 PM	#4
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: How do you tell when a rebuild is needed. Just had mine rebuilt....first sign is when the seals go and it's hard to engage when cold. Other signs are slippage in one gear or another or slow shifts. __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

05-11-2008, 06:26 PM	#6
oldspowered resto body guy Join Date: Mar 2008 Location: milford, Nebraska Posts: 128	Re: How do you tell when a rebuild is needed. i think a trans rebuild is cheap insurance! that way you don't have to pull it back out 3 months down the road! __________________ http://i3.photobucket.com/albums/y86...DSC_0004-2.jpg trucks are ment to haul!

05-11-2008, 09:06 PM	#8
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Re: How do you tell when a rebuild is needed. If it's out and you are rebuilding the engine...REBUILD IT! Especially if you are doing an engine upgrade, changing the TC and adding a shift kit. Gitterdun...LOL! You want to forget about it and not have to worry about it when you use the loud pedal! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

05-12-2008, 08:17 AM	#9
sickchevy68cst Rice Killing 101 Join Date: Feb 2008 Location: aliso viejo California Posts: 107	Re: How do you tell when a rebuild is needed. rebuild it cuz so far ive had to pull my friends 727 torqueflight out 5 times now we're pros at it so get it out of the way so much easier than pullin it out every weekend __________________ distrubin the peace since i got the thing and broke the origianl radio on 95.5 classic rock Ride: 1968 c20 lwb 327(orig motor)/np435/eaton 4.10 w/posi puttin in a 496 rebuilding trans need to rebuild diff :\| need to start takin pics and start a project thread



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