The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-05-2013, 02:10 AM   #1
81Scottsdale520
Registered User
 
81Scottsdale520's Avatar
 
Join Date: Jan 2013
Location: Tucson, AZ
Posts: 132
Exclamation Tranny Help!

So i have a 350 turbo automatic tranny and im not sure if its low on fluid or just giving out. the problem is that its not shifting accurately, like it takes about a few seconds before shifting and at the time it should shift it has the engine revving, the reason i ask about the fluid is because the dipstick is im guessing not the correct one because it is way off. and i ask that because i know that the fluid needs to reach a certain pressure or something for it to shift? i just wanna know what you guys think before i do anything..
__________________
~When In Doubt Go Lower~
81Scottsdale520 is offline   Reply With Quote
Old 12-05-2013, 06:30 AM   #2
donut
Registered User
 
donut's Avatar
 
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
Re: Tranny Help!

What leads you to believe the dipstick is way off?
You can get the proper dipstick from a junkyard or possibly from the dealership. Dealership had mine for the turbo 400, in stock. (iirc, about 20.00)
Other option, drop the pan and check/remark the dipstick. Fluid level is just below the pan gasket. Besides, you can see how much of the trans is in the bottom of the pan.

IMO, if it was run that low on fluid, the damage may already be done. Add some fluid and see what it does. Kinda, hope for the best, plan for the worse.
__________________
'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold )

I'm kinda like duct tape- no real purpose, but handy to have around.
donut is offline   Reply With Quote
Old 12-05-2013, 10:51 AM   #3
crashz
Registered User
 
crashz's Avatar
 
Join Date: Jul 2012
Location: MA
Posts: 207
Re: Tranny Help!

Donut gives good advice.

How does the fluid look on the dip stick? Clean, clear and pink/red is a good sign. Cloudy, brown and sludgy is not. If the fluid condition is poor, try dropping the pan. If its just brown, with slude in the pan (clutch material), clean it real well, clean the magnet (metal fuzz is normal, chuncks are not!), replace the filter and fill with new fluid. It wouldn't hurt to put a new pan with a drain plug on it so that you could periodically re-fresh the fluid. The TC holds the majority of fluid and a pan change only removes about a 3rd of the nasty old stuff. About 5 drain and fills will get about 95% of the old fluid out.

I'll add that if you do find a bunch of junk in the pan, don't fret to much. A good trans shop will likely be able to rebuild the TH350 for a very reasonable price (ie: probably the cheapest auto to rebuild on the planet!). If you do have to rebuild, do your self a favor and bypass the orginal trans cooler and add a new aux cooler instead. Seems like garbage left in the orginal coolers take out new rebuilds all the time, even when flushed out.
__________________
2012 Chevy 2500HD, 6.0L, 6spd auto, 4x4, ECSB
1987 GMC V3500 Dump, 6.2L diesel, TH400
1983 GMC K2500 - awaiting its restoration and Cummins swap.
crashz is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:45 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com