| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,090 Posts1,056,371 Members48,442 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#52687 11/21/2005 6:53 PM | Joined: Oct 2002 Posts: 69 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2002 Posts: 69 | hey all i have a 3L80HD/THM475 from an 87 c-10 pickup i just had,
i plan on using it in another vehicle and its already removed and im in the process of cleaning it up and getitng it ready and all that
i found a few TSB's on this tranny:
903577A OCT 90 Direct Clutch Premature Wear With 3L80 and 3L80-HD
903567A OCT 90 Slip or No Drive With 3L80 and 3L80-HD A/T
904027A FEB 91 Service Replacement Transmission Assembly (Srta) 3L80/3L80-HD
93C07A MAR 93 Recall - Automatic Transmission Vent 4L60, 4L60E & 3L80
can anyone who knows about this particular tranny tell me about it and what to watch for on it or modify/replace in it so it will be alright?
and also what the TSB's above mean ? premature direct clutch wear ? slip or no drive problem ?
thanks for anything, any links, anything,
i have tag info from it if may help any ?
Randy the easter wabbit ! -here to help fellow enthusiasts as best as possible  parting some vehicles, 54 ford truck 57, chevy 210, 69 fairlane coupe HT and others, | | |
#52688 11/21/2005 11:25 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I think the 87 used a 700-4r. I,ve put 2 of them in older trucks & they work excellant. You must get the trottle cable setup & adjustment right or it won,t work right & won,t last long. Also it,s best to hook up a converter lockup system. There is lot,s of info on the net about this because it is a popular swap. The 4L60 & 4L80 are more difficult because they are computer controlled.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#52689 11/22/2005 2:16 AM | Joined: Jan 2001 Posts: 613 Member | | Member Joined: Jan 2001 Posts: 613 | i believe a 3l80 is a turbo 400. | | |
#52690 11/22/2005 2:58 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | I thought the TH475 was only used in heavier applications, like a big 1-ton, not a 1/2-ton pickup.
I have a TH475 in my P30 with a 12,000 lb GVW. My K3500 with a 454 and 8,000+ GVW only has a TH400.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
|
|
| |
