Author Topic: Lose the Lockup on a TH350??  (Read 5019 times)

Offline Ziptar

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Lose the Lockup on a TH350??
« on: July 07, 2005, 06:26:00 AM »
My 85 2wd has a TH350 Lockup Trans in it. The parts clerk says it's an 84 and a half but, what ever.

I am looking for a cheap "rebuild" trans for as the current one leaks and slips, ALLOT!

One shop I called yesterday said he had a "slighty used" TH350 short tail on the shelf for $100 with a 90 day warranty, He said if I brought it down he'd put my long tail shaft on it. Problem is that it's an early non-lockup trans.

I don't really need a lockup as this truck is mostly for dump runs. So my question is, What kind of installation hassles would I be looking at goeeting rid of the lockup?? or none at all, just leave the wiring for it dangling??


Offline Blazin

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Re: Lose the Lockup on a TH350??
« Reply #1 on: July 07, 2005, 08:48:00 AM »
He is going to rip both transmisions all apart to swap in your longer tail shaft? If its going to be torn down that far wy not rebuild it, and if he rips it all apart it could cause problems in the new one, and you won't know until you do all the work of installing it.
I would loook for the correct one save allot of hassle.

Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs

Offline roundedline

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Re: Lose the Lockup on a TH350??
« Reply #2 on: July 07, 2005, 09:27:00 AM »
Ditto!  I personally wouldn't let them swap parts off of yours onto a rebuilt one.  I would want the rebuilt one to have a the right pieces so it would be a direct replacement.  

As for the lockup vs non, you can do without it.  It will drop your RPM's about 400rpms when it locks, so you would loose that if you swapped.  You can swap a non locking TH350 in its place though.  Dimensionally they are exactly the same.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project


Offline Ziptar

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Re: Lose the Lockup on a TH350??
« Reply #3 on: July 07, 2005, 10:17:00 AM »
Thanks for the input guys, good point on tearing it apart to swap the tailshaft.


I got a price on a rebuilt from advanced auto parts they get $595 for them. little more than I want to spend on an $800 truck, that I just use on weekends.

I have a call into another shop, he is looking to see what he has, he said he will also give me a price on "refreshing" my tranny.


Offline roundedline

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Re: Lose the Lockup on a TH350??
« Reply #4 on: July 07, 2005, 10:34:00 AM »
$585!  EEK!  That it high!  I would think more along $250 for a TH350, at least around here.  That price would get you a 700R4.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project


Offline junkyarddog0326

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700R4
« Reply #5 on: July 27, 2005, 09:16:00 AM »
Yeah, I have a 700R4 in my 84LWB 4x4.  Gotta get rid of it.  TH400's go for cheap in the used market, and are cheap to "refresh".


Offline jo3y1nf4nt3

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Re: 700R4
« Reply #6 on: July 27, 2005, 01:55:00 PM »
i have a TH400 (i've been told).....what are some specs on it.  does it have a 'lock-up' and if so, what is it?  is there any kits that could possibly transform it into a 4speed?  or any tips/tricks for it?  thanks, joey.  


jo3y in baytizzle (baytown y'all!)
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Offline roundedline

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Re: 700R4
« Reply #7 on: July 27, 2005, 03:00:00 PM »
TH400's don't have lockup.  You can add it, but it would probably be expensive.  It is a Heavy Duty Transmission.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project


Offline ChevyGuy

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tranny
« Reply #8 on: July 28, 2005, 11:40:00 AM »
If you are doing dump runs with the truck and you arent worried about the lock up I would switch to atleast a th350. the 700 wouldnt last long with heavy loads..... unless built by a good tranny person who knew about the problems the early 700's had.