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 02-08-2013, 07:12 PM   #1
hrc200x
Registered User
 
Join Date: Sep 2002
Location: Minnesota
Posts: 203
'84 turbo 400 locked up, won't even roll in neutral

Truck is a '84 chevy 4x4 3/4ton 350 motor, 400 tranny, 208 tcase with boss plow. Probably around '05 I was driving the truck for the company that owned it and cuising down the road at 55mph it went into neutral, I figured tranny went out. Pulled over, messed with some things, tried 4 lo and it drove, so problem was in the tcase. Truck sat for 2-3 years at the company till I bought it. I was only going to use it for a plow truck around the house so 4lo was all I needed. I ended up trying 4hi because I didn't like how every shift bangs in 4lo and its been working for the past 3 years in 4hi. Yesterday I was plowing for 5 mintues and pushed up into a bank, tried to back up and it wouldn't go, gave it more throttle, somthing went bang and it drove backwards fine. I figured a brake was sticking because usually when I start out plowing a rear brake hangs up going down the driveway. Anyway, push into a bank and same things happens, give it more throttle, bang, back up just fine. Then I try to go forward and it took a ton of throttle to move, so I limped it up the driveway. Basically it goes forward in drive with more than usual throttle, it won't go in reverse at all. I thought maybe it could be brakes, so jacked up a rear tire, unlocked the hubs, tranny in neutral and tried rotating the tire, wouldn't go so took tire off and attemped to remove drum and it was fairly stuck because of the groove cut into the drum from the shoes, after much beating on it I got it off, backed the adjuster off and put drum back on, still the same issue, wouldn't turn over. Tried jacking up both rear tires at the same time and they each spun so brakes were fine, moved to the driver side front, jacked it up and wouldnt' spin at all. take off tire, pry and beat the caliper off, bungie it to the frame so I can go finish plowing and it still wouldn't back up. Check tranny fluid, its a quart and a half low, top it off and still no difference. After I'm fairly sure its the tranny here is what I know. Put shifter in reverse and RPMs drop on motor but it doesn't move, put it in neutral and give it throttle it lurches forward a bit, try to push/roll truck by hand in neutral and it won't roll. In drive truck moves forward, pull it down to first and it doesn't really want to move. I've tried 4hi, 2hi, 4lo and neither lets the truck move, obviously because its the tranny. Neutral on the tcase the truck will roll.

Could I be lucky and the problem is vaccum related? I know there is a vaccum leek under the hood. Fluid is good and red, doesn't smell burnt.
__________________
'75 Chevy 3/4 4x4, 6" suspension lift, 3" body lift, 3" lifted gas tanks, '83 cab, '88 clip, 35" cooper tires, American Racing Baja rims, 350, 700r4, 208.
hrc200x is offline   Reply With Quote
Old 02-08-2013, 09:16 PM   #2
mrolds88
Registered User
 
Join Date: Jul 2011
Location: WV
Posts: 946
Re: '84 turbo 400 locked up, won't even roll in neutral

I had a truck one time that the inner liner of one of the front brake hoses collapsed so that the fluid would go to the caliper and wouldn't come back. Got bad enough that I had to drive it (around the yard) in 4 low. Only way it would move. Maybe your got both after sitting for that long? Also How does the rear act if you have the TC in neutral and 1 wheel in the air? Also same for the front?
mrolds88 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 01:36 AM.


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