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#1 |
Registered User
Join Date: Oct 2012
Location: Balearic Islands, Spain
Posts: 44
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No reverse trouble
Hi there,
My 1970 c20 didn't engage reverse after sitting a while. The rest of geras go fine, but nothing happens when i put in on revese. Anything I could do before opening the whole thing up? In my country automatic transmissions are sci-fi. Three mechanics told me already they won't try. Any help will be appreciated Thanks |
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#2 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: No reverse trouble
Quote:
The first thing I would do is check the transmission fluid. If I remember correctly when the transmission is cold the fluid should just barley show on the bottom of the dip stick. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 |
Registered User
Join Date: Oct 2012
Location: Balearic Islands, Spain
Posts: 44
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Re: No reverse trouble
Thanks, I'll start there.
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#4 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: No reverse trouble
Does it go into Park OK? If not, the linkage adjustment may have slipped. Let us know what you find.
LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#5 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Re: No reverse trouble
I rebuilt a TH350 for my kids Jimmy this summer. I had a little help, but this is something you can do if you have to. TH350/TH400 similar but different so just get the appropriate manual. Or two. Or three. Read online, some good threads.
And read online. Buy a comprehensive rebuild kit. You will need a few special tools, but they can be had or made for less than $100. Get a big, clean work bench so you can disassemble and leave parts in sub component groups. Clean and replace all parts measuring where needed and reassemble.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#6 |
Registered User
Join Date: Nov 2017
Location: Leeds west yorkshire
Posts: 307
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Re: No reverse trouble
Try adjusting cable underneath cab on transmission
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#7 |
Registered User
Join Date: Aug 2018
Location: Bronx, NY
Posts: 215
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Re: No reverse trouble
Run the engine until it is fully warmed up.
With the engine running, put the selector in each position, then put back in park. On a level surface, when you pull the stick, clean it off, and then test the level. The fluid should be at the top of the hatched area. I was down a little on my stick, and the reverse shift was sluggish, until I filled it to the top of the indicator. |
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#8 |
Registered User
Join Date: Oct 2012
Location: Balearic Islands, Spain
Posts: 44
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Re: No reverse trouble
Thanks guys, when you're up we're sleeping over here, so it's nice to get up and find all this help posted.
I'll check all these things today and let you know. All gears go in fine, even reverse, but it won't move backwards. I'll check levels and cable this afternoon and will get back to you. I don't know if I'd be able to open it up, but willing to try. I wanted to check all options before. Thanks a lot for your posts, they really help. |
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#9 |
Registered User
Join Date: Oct 2012
Location: Balearic Islands, Spain
Posts: 44
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Re: No reverse trouble
Fluid and cable are fine. I hear a rubbing metal noise when I put it into reverse, like a gear trying to engage but not doing the job. The rest they all engage fine.
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#10 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,156
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Re: No reverse trouble
It is possible the park pawl is still partly engaged and that is what your hearing. Dropping the pan would reveal if that is the issue. I have seen them broken off in the bottom of the pan. Link to show the parts involved.
http://www.atiracing.com/links/pr/20...arts/index.htm I would also recommend reposting your problem in the link below. Lots of expertise there. http://67-72chevytrucks.com/vboard/s...d.php?t=668062
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#11 |
Registered User
Join Date: Oct 2012
Location: Balearic Islands, Spain
Posts: 44
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Re: No reverse trouble
Great HO, I'll check that and repost, thanks.
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